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MAX11101

14-Bit, +5V, 200ksps ADC with 10µA Shutdown

�� Maxim Integrated Products 1

19-6047; Rev 1; 1/12

Ordering Information appears at end of data sheet.

General Description

The MAX11101 low-power, 14-bit analog-to-digital con-

verter (ADC) features a successive approximation ADC,

automatic power-down, fast 1.1Fs wake-up, and a high-

speed SPI/QSPI™/MICROWIRE®-compatible interface.

The MAX11101 operates with a single +5V analog supply

and features a separate digital supply, allowing direct

interfacing with 2.7V to 5.25V digital logic.

At the maximum sampling rate of 200ksps, the MAX11101

typically consumes 2.45mA. Power consumption is typi-

cally 12.25mW (V

AVDD

= V

DVDD

= 5V) at a 200ksps

(max) sampling rate. AutoShutdown™ reduces supply

current to 140FA at 10ksps and to less than 10FA at

reduced sampling rates.

Excellent dynamic performance and low power, com-

bined with ease of use and small package size (10-pin

FMAX

and 12-bump WLP), make the MAX11101 ideal

for battery-powered and data-acquisition applications

or for other circuits with demanding power consumption

and space requirements.

Applications

Motor Control

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Thermocouple Measurements

Accelerometer Measurements

Portable- and Battery-Powered Equipment

Features

S 14-Bit Resolution, 1 LSB DNL

S +5V Single-Supply Operation

S Adjustable Logic Level (2.7V to 5.25V)

S Input Voltage Range: 0 to V

REF

S Internal Track-and-Hold, 4MHz Input Bandwidth

S SPI/QSPI/MICROWIRE-Compatible Serial Interface

S Small 10-Pin µMAX and WLP Packages

S Low Power

2.45mA at 200ksps

140µA at 10ksps

0.1µA in Power-Down Mode

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a registered trademark of National Semiconductor Corp.

AutoShutdown is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.

Functional Diagram

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX11101.related

AIN

TRACK-AND-

HOLD

14-BIT SAR

ADC

CONTROL

DVDD

DGND

AGND

AVDD

REF

DOUT

SCLK

MAX11101

OUTPUT

BUFFER

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.

Summary of content (19 pages)

PAGE 1
9-6047; Rev 1; 1/12 MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown General Description The MAX11101 low-power, 14-bit analog-to-digital converter (ADC) features a successive approximation ADC, automatic power-down, fast 1.1Fs wake-up, and a highspeed SPI/QSPI™/MICROWIRE®-compatible interface. The MAX11101 operates with a single +5V analog supply and features a separate digital supply, allowing direct interfacing with 2.7V to 5.25V digital logic.
PAGE 2
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown ABSOLUTE MAXIMUM RATINGS AVDD to AGND........................................................-0.3V to +6V DVDD to DGND........................................................-0.3V to +6V DGND to AGND....................................................-0.3V to +0.3V AIN, REF to AGND................................ -0.3V to (VAVDD + 0.3V) SCLK, CS to DGND..................................................-0.3V to +6V DOUT to DGND.............................
PAGE 3
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown ELECTRICAL CHARACTERISTICS (continued) (VAVDD = VDVDD = 4.75V to 5.25V, fSCLK = 4.8MHz (50% duty cycle), 24 clocks/conversion (200ksps), VREF = 4.096V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VREF V 1 FA VAVDD V ANALOG INPUT (AIN) Input Range VAIN Input Leakage Current 0 SCLK idle 0.01 EXTERNAL REFERENCE Input Voltage Range VREF Input Current IREF 3.
PAGE 4
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown TIMING CHARACTERISTICS (VAVDD = VDVDD = 4.75V to 5.25V, fSCLK = 4.8MHz (50% duty cycle), 24 clocks/conversion (200ksps), VREF = 4.096V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (See Figure 1, Figure 2, Figure 3, and Figure 6.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 1.
PAGE 5
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Typical Operating Characteristics (VAVDD = VDVDD = 5V, fSCLK = 4.8MHz, CLOAD = 50pF, VREF = +4.096V, TA = +25°C, unless otherwise noted.) DIFFERENTIAL NONLINEARITY (DNL) vs. CODE 0.4 0.3 0.2 0.1 0.1 DNL (LSB) 0.2 0 -0.1 0 -0.1 -0.2 -0.2 -0.3 -0.3 -0.4 -0.4 -0.5 -1.5 6144 12288 10240 16384 -0.3 MIN INL 0 4096 14336 2048 OUTPUT CODE (DECIMAL) MIN DNL 5.15 5.
PAGE 6
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Typical Operating Characteristics (continued) (VAVDD = VDVDD = 5V, fSCLK = 4.8MHz, CLOAD = 50pF, VREF = +4.096V, TA = +25°C, unless otherwise noted.) ANALOG SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. SAMPLE RATE 0.1000 IDVDD 0.0100 1.88 0.0010 1.86 1.84 1.82 0.0001 100 1.80 1000 4.75 SAMPLE RATE (ksps) 4.95 5.05 5.15 5.25 VAVDD (V) SUPPLY CURRENT vs. TEMPERATURE 2.0 SHUTDOWN SUPPLY CURRENT VS.
PAGE 7
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Typical Operating Characteristics (continued) (VAVDD = VDVDD = 5V, fSCLK = 4.8MHz, CLOAD = 50pF, VREF = +4.096V, TA = +25°C, unless otherwise noted.) GAIN ERROR vs. ANALOG SUPPLY VOLTAGE OFFSET ERROR vs. TEMPERATURE MAX11101 toc15 0.006 GAIN ERROR (%FS) 100 -100 -300 0.002 -0.002 -0.006 -500 -40 -15 10 35 60 -0.010 85 4.75 TEMPERATURE (°C) 4.95 5.05 5.15 5.
PAGE 8
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Pin Configurations TOP VIEW (BUMP SIDE DOWN) TOP VIEW MAX11101 + DOUT 1 DGND 2 DVDD 3 AGND AIN + 10 SCLK 9 CS 8 AGND 4 7 AVDD 5 6 REF MAX11101 1 2 3 4 REF AVDD AGND SCLK AGND REF DGND CS AIN AGND DVDD DOUT A B C µMAX WLP Pin Description PIN NAME FUNCTION 6 REF External Reference Voltage Input. Sets the analog voltage range. Bypass to AGND with a 4.7FF capacitor. A2 7 AVDD Analog +5V Supply Voltage.
PAGE 9
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Detailed Description VDD The MAX11101 includes an input track-and-hold (T/H) and successive-approximation register (SAR) circuitry to convert an analog input signal to a digital 14-bit output. Figure 4 shows the MAX11101 in its simplest configuration. The serial interface requires only three digital lines (SCLK, CS, and DOUT) and provides an easy interface to microprocessors (FPs).
PAGE 10
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown AIN VREF 4.7µF AIN CS REF SCLK DOUT CS SCLK DOUT AVDD MAX11101 +5V 0.1µF +5V DVDD The ADC’s input tracking circuitry has a 4MHz smallsignal bandwidth, so it is possible to digitize high-speed transient events and measure periodic signals with bandwidths exceeding the ADC’s sampling rate by using undersampling techniques. To avoid aliasing of unwanted high-frequency signals into the frequency band of interest, use anti-alias filtering.
PAGE 11
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown CS SCLK tCSS 1 4 tCH DOUT tDN tCL tACQ 6 8 16 12 D13 D12 D11 D10 D9 D8 D7 D6 24 20 D5 D4 D3 D2 D1 tDO D0 S1 S0 tCSH tTR Figure 6. External Timing Diagram COMPLETE CONVERSION SEQUENCE CS DOUT CONVERSION 0 POWERED UP CONVERSION 1 POWERED DOWN POWERED UP Figure 7. Shutdown Sequence A CS falling edge initiates an acquisition sequence.
PAGE 12
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Output Coding and Transfer Function The data output from the MAX11101 is binary and Figure 8 depicts the nominal transfer function. Code transitions occur halfway between successive-integer LSB values (VREF = 4.096V and 1 LSB = 250FV or 4.096V/16384). Applications Information External Reference The MAX11101 requires an external reference with a voltage range between 3.8V and AVDD. Connect the external reference directly to REF.
PAGE 13
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown IN1 IN2 A0 A1 4-TO-1 MUX MAX11101 IN3 AIN OUT IN4 CS CLK ACQUISITION CONVERSION CS A0 A1 CHANGE MUX INPUT HERE Figure 9. Change Multiplexer Input Near Beginning of Conversion to Allow Time for Slewing and Settling Serial Interfaces The MAX11101’s interface is fully compatible with SPI, QSPI, and MICROWIRE standard serial interfaces.
PAGE 14
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown SPI and MICROWIRE Interfaces When using the SPI (Figure 10a) or MICROWIRE (Figure 10b) interfaces, set CPOL = 0 and CPHA = 0. Conversion begins with a falling edge on CS (Figure 10c). Three consecutive 8-bit readings are necessary to obtain the entire 14-bit result from the ADC. DOUT data transitions on the serial clock’s falling edge. The first 8-bit data stream contains all leading zeros. The second 8-bit data stream contains the MSB through D6.
PAGE 15
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown CS CS SCK SCLK MISO DOUT VDD QSPI MAX11101 SS Figure 11a. QSPI Connections 1 SCLK CS 4 6 8 END OF ACQUISITION DOUT* D13 D12 D11 D10 MSB *WHEN CS IS HIGH, DOUT = HIGH-Z 16 12 D9 D8 D7 D6 24 20 D5 D4 D3 D2 D1 D0 S1 S0 HIGH-Z LSB Figure 11b. QSPI Interface Timing Sequence (CPOL = CPHA = 0) VDD VDD SCLK SCK DOUT SDI CS I/O PIC16/17 MAX11101 GND Figure 12a.
PAGE 16
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown 1ST BYTE READ 2ND BYTE READ 12 SCLK 16 CS 0 DOUT* 0 0 0 0 0 0 0 D13 D12 D11 D10 D9 D8 D7 D6 D5 MSB *WHEN CS IS HIGH, DOUT = HIGH-Z 3RD BYTE READ 20 D5 D4 D3 D2 24 D1 D0 S1 S0 HIGH-Z LSB Figure 12b. SPI Interface Timing with PIC16/PIC17 in Master Mode (CKE = 1, CKP = 0, SMP = 0, SSPM3 - SSPM0 =0001) Table 1.
PAGE 17
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Definitions Integral Nonlinearity Integral nonlinearity (INL) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-fit straight line fit or a line drawn between the end points of the transfer function, once offset and gain errors have been nullified. The static linearity parameters for the MAX11101 are measured using the endpoint method.
PAGE 18
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Supplies, Layout, Grounding and Bypassing Use PCBs with separate analog and digital ground planes. Do not use wire-wrap boards. Connect the two ground planes together at the MAX11101. Isolate the digital supply from the analog with a low-value resistor (10I) or ferrite bead when the analog and digital supplies come from the same source (Figure 14).
PAGE 19
MAX11101 14-Bit, +5V, 200ksps ADC with 10µA Shutdown Revision History REVISION NUMBER REVISION DATE 0 9/11 Initial release 1 1/12 Revised the Absolute Maximum Ratings and Electrical Characteristics. DESCRIPTION PAGES CHANGED — 2–4 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.