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General Description

The MAX9867 is an ultra-low power stereo audio codec

designed for portable consumer devices such as

mobile phones and portable gaming consoles.

The device features stereo differential microphone inputs

that can be connected to either analog or digital micro-

phones. The single-ended line inputs, with configurable

preamplifier, can be sent to the ADC for record or routed

directly to the headphone amplifier for playback. An aux-

iliary ADC path can be used to track any DC voltage.

The stereo headphone amplifiers support differential,

single-ended, and capacitorless output configurations.

Using the capacitorless output configuration, the

device can output 10mW into 32Ω headphones.

Comprehensive click-and-pop circuitry suppresses

audible clicks and pops during volume changes and

startup or shutdown.

Utilizing Maxim’s proprietary digital circuitry, the device

can accept any available 10MHz to 60MHz system

clock. This architecture eliminates the need for an

external PLL and multiple crystal oscillators. The stereo

ADC and DAC paths provide user-configurable voice-

band or audioband digital filters. Voiceband filters pro-

vide extra attenuation at the GSM packet frequency

and greater than 70dB stopband attenuation at f

S/2

The MAX9867 operates from a single 1.8V supply, and

supports a 1.65V to 3.6V logic level. An I

C 2-wire seri-

al interface provides control for volume levels, signal

mixing, and general operating modes.

The MAX9867 is available in a tiny 2.2mm x 2.7mm,

0.4mm-ball-pitch, WLP package. A 32-pin 5mm x 5mm

TQFN package is also available.

Features

o 1.8V Single-Supply Operation

o 6.7mW Playback Power Consumption

o 90dB Stereo DAC, 8kHz ≤ fs ≤ 48kHz

o 85dB Stereo ADC, 8kHz ≤ fs ≤ 48kHz

o Battery-Measurement Auxiliary ADC

o Support for Any Master Clock Between 10MHz to

60MHz

o Stereo Digital Microphone Input Support

o Stereo Analog Differential Microphone Inputs

o Stereo Headphone Amplifiers: Differential,

Single-Ended, or Capacitorless

o Stereo Line Inputs

o Voiceband Filter with a Stopband Attenuation

Greater than 70dB

o 1.65V to 3.6V Digital Interface Supply Voltage

o I

S/TDM-Compatible Digital Audio Bus

o 30-Bump, 2.2mm x 2.7mm 0.4mm-Pitch WLP

MAX9867

Ultra-Low Power Stereo Audio Codec

________________________________________________________________

Maxim Integrated Products

19-4573; Rev 0; 4/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX9867EWV+ -40°C to +85°C 30 WLP

MAX9867ETJ+ -40°C to +85°C 32 TQFN-EP*

Denotes lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Applications

Cell Phones

Portable Gaming Devices

Portable Navigation Devices

Portable Multimedia Players

Wireless Headsets

MAX9867

ADC

AUDIO DIGITAL

FILTERS

DAC

MIX

DIGITAL AUDIO INTERFACE

DIGITAL MICROPHONE

INTERFACE

CONTROL

INTERFACE

HEADPHONE

AMP

RIGHT MIC AMP

LEFT MIC AMP

LEFT PREAMP

RIGHT PREAMP

LINEIN 1

LINEIN 2

HEADPHONE

AMP

S/PCM

ADC

Simplified Block Diagram

Summary of content (54 pages)

PAGE 1
9-4573; Rev 0; 4/09 Ultra-Low Power Stereo Audio Codec Features o 1.8V Single-Supply Operation o 6.7mW Playback Power Consumption o 90dB Stereo DAC, 8kHz ≤ fs ≤ 48kHz The MAX9867 is an ultra-low power stereo audio codec designed for portable consumer devices such as mobile phones and portable gaming consoles. The device features stereo differential microphone inputs that can be connected to either analog or digital microphones.
PAGE 2
MAX9867 Ultra-Low Power Stereo Audio Codec ABSOLUTE MAXIMUM RATINGS (Voltages with respect to AGND.) DVDD, AVDD, and PVDD .........................................-0.3V to +2V DVDDIO.................................................................-0.3V to +3.6V DGND and PGND..................................................-0.1V to +0.1V PREG, REF, REG, MICBIAS ....................-0.3V to (AVDD + 0.3V) MCLK, LRCLK, BCLK SDOUT, SDIN .................................-0.3V to (DVDDIO + 0.3V) SDA, SCL, IRQ ..
PAGE 3
Ultra-Low Power Stereo Audio Codec (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX9867 Ultra-Low Power Stereo Audio Codec ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Ultra-Low Power Stereo Audio Codec (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
MAX9867 Ultra-Low Power Stereo Audio Codec ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
Ultra-Low Power Stereo Audio Codec (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 8
MAX9867 Ultra-Low Power Stereo Audio Codec ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS VAVDD = VPVDD = 1.65V to 1.
PAGE 9
Ultra-Low Power Stereo Audio Codec (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 10
MAX9867 Ultra-Low Power Stereo Audio Codec ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 11
Ultra-Low Power Stereo Audio Codec (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (SDA, SCL) Input High Voltage VIH Input Low Voltage VIL 0.
PAGE 12
MAX9867 Ultra-Low Power Stereo Audio Codec ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential mode, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL = 0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 13
Ultra-Low Power Stereo Audio Codec -20 -20 -50 3kHz -40 -50 3kHz -80 5 10 15 20 25 35 30 1kHz 6kHz -80 20Hz -90 0 -50 -70 20Hz -90 -40 -60 1kHz -70 -80 20Hz -90 0 10 20 30 40 50 0 60 5 10 15 20 25 35 30 POWER OUT (mW) POWER OUT (mW) POWER OUT (mW) TOTAL HARMONIC DISTORTION + NOISE vs. POWER OUT (DAC TO HEADPHONE) TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY (DAC TO HEADPHONE) TOTAL HARMONIC DISTORTION + NOISE vs.
PAGE 14
Typical Operating Characteristics (continued) (VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK = 8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.
PAGE 15
Ultra-Low Power Stereo Audio Codec TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY (LINE IN TO HEADPHONE) -20 -30 THD+N (dB) THD+N (dB) -30 -40 -50 5mW -40 -50 -60 -60 -70 -70 MCLK = 12.288MHz LRCLK = 48kHz THD+N = < 0.1% DIFFERENTIAL MODE 50 POWER OUT (mW) -20 LINE IN PREAMP = +18dB RLOAD = 32Ω DIFFERENTIAL MODE -10 POWER OUT vs.
PAGE 16
Typical Operating Characteristics (continued) (VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK = 8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.
PAGE 17
Ultra-Low Power Stereo Audio Codec PLL MODE 0 FREQ = 0xA 0 FREQ = 0xA 0 -60 -80 -20 AMPLITUDE (dB) AMPLITUDE (dB) -40 -60 -80 -40 -60 -80 -100 -100 -100 -120 -120 -120 -140 0 2 4 6 8 10 12 14 16 18 20 -140 0 500 1000 1500 2000 2500 3000 3500 4000 0 500 1000 1500 2000 2500 3000 3500 4000 FREQUENCY (kHz) FREQUENCY (Hz) FREQUENCY (Hz) FFT, MICROPHONE TO ADC, 0dBFS, MCLK = 12.288MHz, LRCLK = 48kHz FFT, MICROPHONE TO ADC, -60dBFS, MCLK = 12.
PAGE 18
Typical Operating Characteristics (continued) (VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2μF, CMICBIAS = CPREG = CREG = 1μF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK = 8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.
PAGE 19
Ultra-Low Power Stereo Audio Codec SCL (2V/div) LOUTP (500mV/div) ADC OUT (500mV/div) SCL (2V/div) MAX9867 toc54 ADC SOFT-START MAX9867 toc53 FULL OPERATION TO SHUTDOWN (DAC) TIME (1ms/div) TIME (4ms/div) TOTAL HARMONIC DISTORTION + NOISE vs. MCLK FREQUENCY, 0dBFS THD+N (dB) -30 -40 -50 -60 -70 VIN = -60dBFS LRCLK = 48kHz PLL MODE A-WEIGHTED 110 DYNAMIC RANGE (dB) -20 -80 MAX9867 toc56 LRCLK = 48kHz PLL MODE -10 DYNAMIC RANGE vs.
PAGE 20
Ultra-Low Power Stereo Audio Codec MAX9867 Pin Description PIN/BUMP FUNCTION WLP 1 A2 DGND 2 B3 SCL I2C Serial-Clock Input. Connect a pullup resistor to a 1.7V to 3.3V supply. 3 A3 SDA 4 C3 IRQ 5 A4 AVDD I2C Serial-Data Input/Output. Connect a pullup resistor to a 1.7V to 3.3V supply. Hardware Interrupt Output. IRQ can be programmed to pull low when bits in status register 0x00 are set. Read status register 0x00 to clear IRQ once set.
PAGE 21
Ultra-Low Power Stereo Audio Codec PIN/BUMP NAME FUNCTION E3 LOUTP Positive Left-Channel Headphone Output. Connect directly to the load in differential and capacitorless mode. AC-couple to the load in single-ended mode. 23 E2 PVDD Headphone Power Supply. Bypass to PGND with a 1μF capacitor. 24, 25 — N.C. 26 E1 DVDDIO 27 D1 SDOUT 28 C2 SDIN 29 C1 LRCLK 30 B1 BCLK Digital Audio Bit Clock Input/Output.
PAGE 22
MAX9867 Ultra-Low Power Stereo Audio Codec I2C Slave Address I2C Registers The MAX9867 responds to the slave address 0x30 for all write commands and 0x31 for all read operations. The MAX9867 audio codec is completely controlled through software using an I2C interface. The power-on default setting is complete shutdown, requiring that the internal registers be programmed to activate the device. See Table 1 for the device’s complete register map. Table 1.
PAGE 23
Ultra-Low Power Stereo Audio Codec register and are set the next time the event occurs. Registers 0x02 and 0x03 report the DC level applied to AUX. See the ADC section for more details and Table 2. Table 2.
PAGE 24
MAX9867 Ultra-Low Power Stereo Audio Codec Hardware Interrupts accommodate a wide range of system architectures, the MAX9867 supports three main clocking modes: • Normal: This mode uses a 15-bit clock divider coefficient to set the sample rate relative to the prescaled MCLK input (PCLK). This allows high flexibility in both the MCLK and LRCLK frequencies and can be used in either master or slave mode. • Exact Integer: In both master and slave mode, common MCLK frequencies (12MHz, 13MHz, 16MHz, and 19.
PAGE 25
Ultra-Low Power Stereo Audio Codec BITS MAX9867 Table 4. Clock Control Registers (continued) FUNCTION Exact Integer Modes Allows integer sampling for specific PCLK (prescaled MCLK) frequencies and 8kHz or 16kHz sample rates. FREQ[3:0] PCLK (MHz) LRCLK (kHz) PCLK/LRCLK Normal or PLL mode 0x00 Reserved 0x1–0x7 FREQ PLL Reserved Reserved 0x8 12 8 1500 0x9 12 16 750 0xA 13 8 1625 0xB 13 16 812.5 0xC 16 8 2000 0xD 16 16 1000 0xE 19.2 8 2400 0xF 19.
PAGE 26
MAX9867 Ultra-Low Power Stereo Audio Codec Digital Audio Interface mode, BCLK can be configured in a number of ways to ensure compatiblity with other audio devices. LVOLFIX is used to fix the line input playback volume to 0dB regardless of VOLL and VOLR. See the Line Inputs section for complete details and Table 6. The MAX9867’s digital audio interface supports a wide range of operating modes to ensure maximum compatibility. See Figures 1–4 for timing diagrams.
PAGE 27
Ultra-Low Power Stereo Audio Codec MAX9867 Table 6. Digital Audio Interface Registers (continued) BITS TDM DMONO BSEL FUNCTION TDM Mode Select 0 = LRCLK signal polarity indicates left and right audio. 1 = LRCLK is a framing pulse that transitions polarity to indicate the start of a frame of audio data consisting of multiple channels. When operating in TDM mode, the left channel is output immediately following the frame sync pulse.
PAGE 28
MAX9867 Ultra-Low Power Stereo Audio Codec AUDIO MASTER MODES: LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 0 7ns (typ) 7ns (typ) LRCLK LEFT RIGHT 1/fS RELATIVE TO PCLK (SEE NOTE) D15 SDOUT D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 40ns (max) 0ns (min) 7ns (typ) D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 7ns (typ) BCLK 25ns (min) CONFIGURED BY BSEL 0ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDIN D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2
PAGE 29
Ultra-Low Power Stereo Audio Codec MAX9867 I2S: WCI = 0, BCI = 0, DLY = 1, SDODLY = 0 7ns (typ) 7ns (typ) LRCLK LEFT RIGHT 1/fS RELATIVE TO PCLK (SEE NOTE) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDOUT 40ns (max) 0ns (min) 7ns (typ) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 7ns (typ) BCLK 25ns (min) CONFIGURED BY BSEL 0ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDIN D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LEFT JUSTIFIED: WCI = 0,
PAGE 30
MAX9867 Ultra-Low Power Stereo Audio Codec VOICE (TDM, PCM) MASTER MODES: BCI = 0, HIZOFF = 0, SDODLY = 0 7ns (typ) 7ns (typ) LRCLK 1/fS RELATIVE TO PCLK (SEE NOTE) SDOUT L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 40ns (max) 0ns (min) L5 L4 L3 L2 L1 7ns (typ) L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 7ns (typ) BCLK 25ns (min) SDIN CONFIGURED BY BSEL 0ns (min) L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 BCI =
PAGE 31
Ultra-Low Power Stereo Audio Codec MAX9867 AUDIO SLAVE MODES: LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 0 LRCLK LEFT RIGHT 1/fS 0ns (min) 25ns (min) D15 SDOUT D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 40ns (max) 0ns (min) D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 30ns (min) BCLK 25ns (min) 75ns (min) 0ns (min) 30ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDIN D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LEFT JUSTIFIED + LRCLK INVERT
PAGE 32
MAX9867 Ultra-Low Power Stereo Audio Codec I2S: WCI = 0, BCI = 0, DLY = 1, SDODLY = 0 LEFT LRCLK RIGHT 1/fS 0ns (min) 25ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDOUT 40ns (max) 0ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 30ns (min) BCLK 25ns (min) 75ns (min) 0ns (min) 30ns (min) D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDIN D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 1 LRCLK
PAGE 33
Ultra-Low Power Stereo Audio Codec MAX9867 VOICE (TDM, PCM) SLAVE MODES: BCI = 0, HIZOFF = 0, SDODLY = 0 LRCLK 1/fS 0ns (min) 25ns (min) SDOUT L15 L14 L13 L12 L11 L10 L9 L8 L7 40ns (max) 0ns (min) L6 L5 L4 L3 L2 L1 0ns (min) L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 30ns (min) BCLK 25ns (min) SDIN 75ns (min) 0ns (min) L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 30ns (min) L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 BCI = 1, HIZOFF = 0, SDODLY =
PAGE 34
MAX9867 Ultra-Low Power Stereo Audio Codec Digital Filtering stopband attenuation as well as selectable highpass filters. The FIR filters provide low-power consumption and are linear phase to maintain stereo imaging. Table 7 is the digital filtering register. The MAX9867 incorporates both IIR (voice) and FIR (audio) digital filters to accomodate a wide range of audio sources. The IIR fiilters provide over 70dB of Table 7.
PAGE 35
Ultra-Low Power Stereo Audio Codec gain adjustment is also provided to set the sidetone level relative to the playback level. Table 9 is the digital gain registers. Table 9. Digital Gain Registers REGISTER B7 Sidetone B6 B5 DSTS DAC Level 0 DVST DACM B2 B1 DVST DACG AVL BITS DSTS B3 0 DACM ADC Level B4 B0 REGISTER ADDRESS 0x0B DACA 0x0C AVR 0x0D FUNCTION Digital Sidetone Source Mixer 00 = No sidetone is selected.
PAGE 36
MAX9867 Ultra-Low Power Stereo Audio Codec Table 9. Digital Gain Registers (continued) BITS DACG DACA AVL/AVR FUNCTION DAC Gain 00 = 0dB 01 = +6dB 10 = +12dB 11 = +18dB Note: DACG is only used when MODE = 0. If MODE = 1, the DAC level is only set by DACA. DAC Level Control DACA works in all modes.
PAGE 37
Ultra-Low Power Stereo Audio Codec BITS MAX9867 Table 10. Line Input Registers (continued) FUNCTION Line-Input Left/Right Playback Mute 0 = Line input is connected to the headphone amplifiers. 1 = Line input is disconnected from the headphone amplifiers.
PAGE 38
MAX9867 Ultra-Low Power Stereo Audio Codec Table 11. Playback Volume Registers (continued) BITS VOLLM/VOLRM FUNCTION Left/Right Playback Mute VOLLM and VOLRM mute both the DAC and line input audio signals. 0 = Audio playback is unmuted. 1 = Audio playback is muted Note: VSEN has no effect on the mute function. When VOLLM or VOLRM is set, the output is muted immediately (ZDEN = 1) or at the next zero-crossing (ZDEN = 0).
PAGE 39
Ultra-Low Power Stereo Audio Codec BITS MAX9867 Table 12. Microphone Input Register (continued) FUNCTION Left/Right Microphone Preamplifier Gain Enables the microphone circuitry and sets the preamplifier gain.
PAGE 40
MAX9867 Ultra-Low Power Stereo Audio Codec ADC The MAX9867 includes two 16-bit ADCs. The first ADC is used to record left-channel microphone and line-input audio signals. The second ADC can be used to record right-channel microphone and line-input signals, or it can be configured to accurately measure DC voltages. When measuring DC voltages, both the left and right ADCs must be enabled by setting ADLEN and ADREN in register 0x17.
PAGE 41
Ultra-Low Power Stereo Audio Codec b. Wait 40ms. c. Freeze the measurement results (AUXCAP = 1). d. Read AUX and store the value in memory to correct all future measurements (k = (AUX[15:0]). e. Complete calibration (AUXGAIN = AUXCAP = AUXEN = 0). 6) Measure the voltage on JACKSNS/AUX: a. b. c. d. c. Wait 40ms. d. Complete calibration (AUXCAL = 0). Enable the AUX input (AUXEN = 1). Wait 40ms. Freeze the measurement results (AUXCAP = 1). Read AUX and correct with the gain calibration value. e.
PAGE 42
MAX9867 Ultra-Low Power Stereo Audio Codec Digital Microphone Input phone input. The right analog microphone input is still available to allow a combination of analog and digital microphones to be used. Figure 6 shows the digital microphone interface timing diagram. See Table 15. The MAX9867 can accept audio from up to two digital microphones. When using digital microphones, the left analog microphone input is retasked as a digital micro- Table 15.
PAGE 43
Ultra-Low Power Stereo Audio Codec Headset Detection Overview The MAX9867 features headset detection that can detect the insertion and removal of a jack as well as the load type. When a jack is detected, an interrupt on IRQ can be triggered to alert the microcontroller of the event. Figure 7 shows the typical configuration for jack detection. Sleep-Mode Headset Detection When the MAX9867 is in shutdown and the power supply is available, sleep-mode headset detection can be enabled to detect jack insertion.
PAGE 44
MAX9867 Ultra-Low Power Stereo Audio Codec Table 16. Mode Configuration Register REGISTER Mode B7 B6 B5 B4 B3 DSLEW VSEN ZDEN 0 JDETEN BITS DSLEW VSEN ZDEN JDETEN HPMODE B2 B1 B0 HPMODE 0x16 FUNCTION Digital Volume Slew Speed 0 = Digital volume changes are slewed over 10ms. 1 = Digital volume changes are slewed over 80ms. Volume Change Smoothing 0 = Volume changes slew through all intermediate values. 1 = Volume changes occur in one step.
PAGE 45
Ultra-Low Power Stereo Audio Codec Table 17. Power-Management Register REGISTER System Shutdown B7 B6 B5 B4 B3 B2 B1 B0 REGISTER ADDRESS SHDN LNLEN LNREN 0 DALEN DAREN ADLEN ADREN 0x17 BITS SHDN LNLEN LNREN DALEN DAREN ADLEN ADREN FUNCTION Shutdown Places the device in low-power shutdown mode. Left-Line Input Enable Enables the left-line input preamp and automatically enables the left and right headphone amplifiers.
PAGE 46
MAX9867 Ultra-Low Power Stereo Audio Codec I2C Serial Interface required on SCL if there are multiple masters on the bus, or if the single master has an open-drain SCL output. Series resistors in line with SDA and SCL are optional. Series resistors protect the digital inputs of the MAX9867 from high-voltage spikes on the bus lines, and minimize crosstalk, and undershoot of the bus signals.
PAGE 47
Ultra-Low Power Stereo Audio Codec Slave Address The slave address is defined as the 7 most significant bits (MSBs) followed by the read/write bit. For the MAX9867, the 7 most significant bits are 0011000. Setting the read/write bit to 1 (slave address = 0x31) configures the MAX9867 for read mode. Setting the read/write bit to 0 (slave address = 0x30) configures the MAX9867 for write mode. The address is the first byte of information sent to the MAX9867 after the START condition.
PAGE 48
MAX9867 Ultra-Low Power Stereo Audio Codec The first byte transmitted from the MAX9867 is the content of register 0x00. Transmitted data is valid on the rising edge of SCL. The address pointer autoincrements after each read data byte. This autoincrement feature allows all registers to be read sequentially within one continuous frame. A STOP condition can be issued after any number of read data bytes.
PAGE 49
Ultra-Low Power Stereo Audio Codec S SLAVE ADDRESS 0 R/W ACKNOWLEDGE FROM MAX9867 REGISTER ADDRESS ACKNOWLEDGE FROM MAX9867 A Sr REPEATED START SLAVE ADDRESS 1 R/W A DATA BYTE A P 1 BYTE AUTOINCREMENT INTERNAL REGISTER ADDRESS POINTER Figure 15. Reading n Bytes of Data from the MAX9867 Applications Information Proper layout and grounding are essential for optimum performance.
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Ultra-Low Power Stereo Audio Codec 1.7V–3.6V 1.8V TO PROCESSOR SYSTEM CLOCK 1μF 1μF REF 8 (B5) REG 10 (B6) MICBIAS 4 (C3) 3 (A3) 2 (B3) 31 (B2) 30 (B1) 29 (C1) 28 (C2) 27 (D1) IRQ SDA SCL MCLK BCLK LRCLK SDIN SDOUT 32 (A1) 1μF DVDD 1μF 7 (A5) 5 (A4) 23 (E2) PREG AVDD I2C VCM PREG CLOCK GEN DIGITAL AUDIO INTERFACE LINEAR REG DSTS 2.2kΩ DVST: 0dB TO -60dB 11 0.
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Ultra-Low Power Stereo Audio Codec PVDD LOUTN ROUTN ROUTP PGND JACKSNS/AUX 24 LOUTP N.C. TOP VIEW 23 22 21 20 19 18 17 TOP VIEW (BUMP SIDE DOWN) 16 N.C.
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Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 30 WLP W302A2+3 21-0211 32 TQFN-EP T3255+4 21-0140 WLP PKG.
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Ultra-Low Power Stereo Audio Codec QFN THIN.EPS ______________________________________________________________________________________ 53 MAX9867 Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
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MAX9867 Ultra-Low Power Stereo Audio Codec Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.