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Preliminary Product Information

This document contains information for a new product.

Cirrus Logic reserves the right to modify this product without notice.

Gate Drivers

Class-H

Controller

Advanced ΔΣ

Modulator

Gate Drivers

Internal

Oscillator

Gain

Audio In +

Audio In -

Shutdown

Speaker Out +

Speaker Out -

GND

VBATT

2.5V - 5V

LDO Filter

Short Circuit/Thermal

Protection

MODE

Low Drop-Out

Voltage Regulator

Gain Select

2.8 W Mono Class-D Audio Amplifier with Low Idle Current

CS35L00 Features

 Hybrid Class-D Architecture

– <1 mA Quiescent Current

– 1 x 2.8 W into 4 Ω (10% THD+N)

– 1 x 2.3 W into 4 Ω (1% THD+N)

– 1 x 1.7 W into 8 Ω (10% THD+N)

– 1 x 1.4 W into 8 Ω (1% THD+N)

 Advanced ΔΣ Closed-loop Modulation

– 98 dB Signal-to-Noise Ratio (A-Weighted)

– 0.02% THD+N @ 1 W (SD & HD Mode)

 Integrated Protection and Automatic Recovery

for Output Short-circuit and Thermal Overload

 Thermally Enhanced 10-pin DFN Package with

Pin-selectable Gain of +6 dB or +12 dB

 Pop and Click Suppression

Common Applications

 Laptops

 Netbooks

 Portable Navigation Devices

 Active Speakers

 Portable Gaming

General Description

The CS35L00 is a 2.8 W high efficiency Hybrid Class-D

audio amplifier with low idle current consumption and a

selectable gain.

The CS35L00 features an advanced closed-loop archi-

tecture to provide 0.02% THD+N at 1 W and -88 dB

PSRR at 217 Hz.

A flexible Hybrid Class-D output stage offers four

modes of operation: Standard Class-D (SD) mode of-

fers full audio bandwidth and high audio performance;

Hybrid Class-D (HD) mode offers a substantial reduc-

tion in idle power consumption with an integrated Class-

H controller; Reduced Frequency Class-D (FSD) mode

reduces the output switching frequency, producing low-

er electromagnetic interference (EMI); and Reduced

Frequency Hybrid Class-D (FHD) mode produces both

the lower idle power consumption of HD mode and the

reduced EMI benefits of FSD mode.

Requiring minimal external components and PCB

space, the CS35L00 is available in a 3.0 mm x 3.0 mm,

10-pin DFN package in Commercial grade (-10°C to

+70°C). Please see “Ordering Information” on page 33

for package options and gain configurations.

CS35L00

FEB '11

DS906PP1

Summary of content (34 pages)

PAGE 1
CS35L00 2.8 W Mono Class-D Audio Amplifier with Low Idle Current CS35L00 Features General Description  Hybrid Class-D Architecture The CS35L00 is a 2.8 W high efficiency Hybrid Class-D audio amplifier with low idle current consumption and a selectable gain.     – <1 mA Quiescent Current – 1 x 2.8 W into 4 Ω (10% THD+N) – 1 x 2.3 W into 4 Ω (1% THD+N) – 1 x 1.7 W into 8 Ω (10% THD+N) – 1 x 1.4 W into 8 Ω (1% THD+N) Advanced ΔΣ Closed-loop Modulation – 98 dB Signal-to-Noise Ratio (A-Weighted) – 0.
PAGE 2
CS35L00 TABLE OF CONTENTS 1. PIN DESCRIPTIONS FOR CS35L00 ..................................................................................................... 5 2. DIGITAL PIN CONFIGURATIONS ......................................................................................................... 6 3. TYPICAL CONNECTION DIAGRAMS ................................................................................................... 7 4. CHARACTERISTICS & SPECIFICATIONS ...........................................
PAGE 3
CS35L00 LIST OF FIGURES Figure 1.Top View of DFN Pin Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2.Typical Connection Diagram for SD & FSD Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3.Typical Connection Diagram for HD & FHD Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4.
PAGE 4
CS35L00 Figure 53.Efficiency vs. Output Power - FHD Mode RL = 4 Ω + 33 μH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 54.Supply Current vs. Output Power - FHD Mode RL = 8 Ω + 33 μH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 55.Supply Current vs. Output Power - FHD Mode RL = 4 Ω + 33 μH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 LIST OF TABLES Table 1. LFILT+ and MODE Operation Configurations . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
CS35L00 1. PIN DESCRIPTIONS FOR CS35L00 SD 1 10 OUT+ IN- 2 9 GND LFILT+ 3 8 VBATT IN+ 4 7 GAIN_SEL MODE 5 6 OUT- Thermal Pad Figure 1. Top View of DFN Pin Out (Looking down through package) Pin Name # Pin Description SD 1 Shutdown (Input) - Pulling this pin low places the CS35L00 in shutdown. IN- 2 Negative Analog Input (Input) - Differential negative audio signal input LFILT+ 3 Low Drop Out Regulator Filter (Output) - Bypass capacitor connection point for internal LDO.
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CS35L00 2. DIGITAL PIN CONFIGURATIONS See (Note 1) and (Note 2) below the table. Power Supply VBATT I/O Name Pin # Direction Internal Connections Configuration SD 1 Input No Internal Pull Up Hysteresis on CMOS Input MODE 5 Input No Internal Pull Up Hysteresis on CMOS Input GAIN_SEL 7 Input No Internal Pull Up Hysteresis on CMOS Input Note: 1. Refer to specification table “Digital Interface Specifications & Characteristics” on page 14 for details on the digital I/O characteristics. 2.
PAGE 7
CS35L00 3. TYPICAL CONNECTION DIAGRAMS 2.5V - 5V 0.1uF System Controller LFILT+ 10uF VBATT MODE SD Audio In+ AIN+ Audio In- AIN+ OUT+ OUT- GAIN_SEL Connect to VBATT for +6dB Gain or GND for +12dB Gain GND Figure 2. Typical Connection Diagram for SD & FSD Mode 2.5V - 5V (Note 3) 1uF System Controller 10uF LFILT+ 0.1uF VBATT MODE SD Audio In+ AIN+ Audio In- AIN+ OUT+ OUT- GAIN_SEL GND Connect to VBATT for +6dB Gain or GND for +12dB Gain Figure 3.
PAGE 8
CS35L00 4. CHARACTERISTICS & SPECIFICATIONS Test Conditions (unless otherwise specified): GND = 0 V; All voltages with respect to ground; Input signal = 997 Hz differential sine wave; TA = 25°C; VBATT = 5.0 V; RL = 8 Ω; 22 Hz to 20 kHz measurement bandwidth; Measurements taken with AES17 measurement filter and Audio Precision AUX-0025 passive filter. RECOMMENDED OPERATING CONDITIONS GND = 0 V; All voltages with respect to ground. Please see (Note 4). Parameters Symbol Min Typ Max Units VBATT 2.
PAGE 9
CS35L00 ELECTRICAL CHARACTERISTICS - ALL OPERATIONAL MODES Parameters Min Typ ILFILT+ - 10 - μA ZLFILT+ - 0.7 - Ω VBLIM - 3.0 - VDC GAIN_SEL = Low (12 dB) GAIN_SEL = High (6 dB) - 0.015•VBATT 0.029•VBATT - Vrms Vrms Input Level for Entering VBATT Operation in GAIN_SEL = Low (12 dB) V HD/FHD Modes (Note 9) IN-VBATT GAIN_SEL = High (6 dB) - 0.10 0.20 - Vrms Vrms tLDO - 1200 - ms VLDO - 1.
PAGE 10
CS35L00 ELECTRICAL CHARACTERISTICS - SD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ Max Units THD+N = 1% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.35/0.95/0.73 2.25/1.58/1.22 - W W THD+N = 10% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.67/1.18/0.91 2.82/2.00/1.53 - W - 0.02 - % W Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 11
CS35L00 ELECTRICAL CHARACTERISTICS - FSD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.28/0.90/0.69 2.16/1.51/1.15 - W W THD+N = 10% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.65/1.17/0.90 2.76/1.95/1.51 - W - 0.10 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 12
CS35L00 ELECTRICAL CHARACTERISTICS - HD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.34/0.94/0.73 2.25/1.58/1.22 - W W THD+N = 10% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.67/1.18/0.91 2.83/2.00/1.53 - W - 0.02 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 13
CS35L00 ELECTRICAL CHARACTERISTICS - FHD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.28/0.89/0.68 2.17/1.51/1.15 - W W THD+N = 10% RL = 8 Ω (VBATT = 5.0/4.2/3.7 VDC) RL = 4 Ω (VBATT = 5.0/4.2/3.7 VDC) - 1.65/1.16/0.90 2.76/1.95/1.51 - W - 0.10 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 14
CS35L00 DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS Parameters Symbol Min Max Units Iin - ±10 μA Input Capacitance - 10 pF SD Pulse Width Requirement 1 - ms Input Leakage Current Logic I/Os (Applicable to GAIN_SEL, MODE, and SD) High-Level Input Voltage VIH 0.7•VBATT - V Low-Level Input Voltage VIL - 0.
PAGE 15
CS35L00 5. APPLICATIONS 5.1 MODE Descriptions The CS35L00 device can be operated in one of four operating modes, determined by the MODE pin and the LFILT+ pin. The four modes of operation are Standard Class-D operation (SD), Reduced Frequency Standard Class-D operation (FSD), Hybrid Class-D operation (HD), and Reduced Frequency Hybrid ClassD operation (FHD). Each of these modes can be leveraged to optimize different performance criteria in an array of applications.
PAGE 16
CS35L00 In both HD and FHD mode, the value of the capacitance connected to the LFILT+ pin must not exceed 4.7 μF. If this value is greater than 4.7 μF, it will prevent the rail voltage of the output devices from transitioning properly between VBATT and the internal LDO. 5.1.2.1 HD Mode Hybrid Class-D mode (HD) provides competitive analog performance with a substantial reduction in idle power dissipation and radiation emissions.
PAGE 17
CS35L00 ZIN = Input impedance of the device being used (See “Electrical Characteristics - SD Mode” on page 10, “Electrical Characteristics - FSD Mode” on page 11, “Electrical Characteristics - HD Mode” on page 12, or “Electrical Characteristics - FHD Mode” on page 13 for this value.) ZEXT = Value of the resistor added in series with the inputs AV = Original gain of the device being used (See “Electrical Characteristics - All Operational Modes” on page 9 for this value.) 5.
PAGE 18
CS35L00 allows the ferrite bead to sufficiently attenuate the problematic high-frequency emissions without compromising audio performance. 5.3.3 Output Filter Power Dissipation Considerations In systems without inductive series elements like inductors or ferrite beads, power losses in the output filter are equal to the switching losses that occur in the system due to the cyclical charging and discharging of capacitors connected to the amplifier outputs.
PAGE 19
CS35L00 Static signals (i.e. sine waves at a fixed amplitude) are easier to consider than are dynamic signals (i.e. musical content), as they are governed by the same equation as that listed in Section 5.3.3.1 and Section 5.3.3.2 on page 18.
PAGE 20
CS35L00 5.4.2 Recommended Power-Down Sequence 1. Mute the audio supplied to the CS35L00. 2. Pull the SD pin low in order to reset the device and put it into the low power mode. 3. The power supply to the CS35L00 can now be removed. 5.5 Over Temperature Protection The CS35L00 is internally protected against thermal overload. Built in die temperature sensing circuitry monitors the die temperature and will place the device into shut-down if thermal overload occurs.
PAGE 21
CS35L00 6. TYPICAL PERFORMANCE PLOTS Test Conditions (unless otherwise specified): GND = 0 V; All voltages with respect to ground; AV = 6 dB; Input signal = 997 Hz differential sine wave; TA = 25°C; VBATT = 5.0 V; RL = 8 Ω; 10 Hz to 20 kHz measurement bandwidth; Measurements taken with AES17 measurement filter and Audio Precision AUX-0025 passive filter. 6.1 SD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 1 5.0 V 4.2 V 3.7 V 2 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.
PAGE 22
CS35L00 3.5 7.00 3.0 6.00 RL = 4 Ω 10% THD+N Ratio 2200 pF 2.5 Output Power (W) Idle Current Draw (mA) 5.00 4.00 1000 pF 3.00 2.00 2.0 RL = 4 Ω 1% THD+N Ratio 1.5 1.0 470 pF RL = 8 Ω 10% THD+N Ratio 0.5 1.00 RL = 8 Ω 1% THD+N Ratio No Filter 0.0 0.00 2.5 3 3.5 4 4.5 5 2.5 5.5 3.0 3.5 4.5 5.0 5.5 Figure 15. Output Power vs. VBATT - SD Mode Figure 14. Idle Current Draw vs. VBATT - SD Mode RL = 8 Ω + 33 μH (Note 16) 100% 100% 90% 90% 80% 80% 3.7 V 5.0 V 4.
PAGE 23
CS35L00 6.2 FSD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m Figure 20. THD+N vs. Output Power - FSD Mode RL = 8 Ω 100m 200m 500m 1 2 3 W W Figure 21. THD+N vs. Output Power - FSD Mode RL = 4 Ω 10 10 5 5 2 2 1.0 W 1 0.75 W 1 0.5 0.5 0.1 W 0.2 % 0.1 W 0.2 % 0.1 0.1 0.05 0.05 0.5 W 0.
PAGE 24
CS35L00 3.5 3.50 3.0 3.00 2.5 2.00 Output Power (W) 2.50 Idle Current Draw (mA) RL = 4 Ω 10% THD+N Ratio 2200 pF 1000 pF 470 pF 1.50 2.0 RL = 4 Ω 1% THD+N Ratio 1.5 1.0 1.00 RL = 8 Ω 10% THD+N Ratio No Filter 0.50 0.5 0.00 0.0 2.5 3 3.5 4 4.5 5 RL = 8 Ω 1% THD+N Ratio 2.5 5.5 3.0 3.5 4.0 4.5 Figure 26. Idle Current Draw vs. VBATT - FSD Mode RL = 8 Ω + 33 μH (Note 17) 100% 100% 90% 90% 80% 3.7 V 4.2 V 5.0 V 70% 70% 60% 60% Efficiency (%) 3.7 V Efficiency (%) 5.
PAGE 25
CS35L00 6.3 HD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m W 200m 500m 1 2 3 Figure 33. THD+N vs. Output Power - HD Mode RL = 4 Ω Figure 32. THD+N vs. Output Power - HD Mode RL = 8 Ω 10 10 5 5 2 2 1 1 0.5 0.5 1.0 W 0.2 % 100m W 0.2 0.75 W % 0.1 0.1 0.05 0.05 0.1 W 0.1 W 0.02 0.02 0.
PAGE 26
CS35L00 4.50 3.5 4.00 3.0 RL = 4 Ω 10% THD+N Ratio 3.50 2.5 Idle Current Draw (mA) 3.00 2.50 Output Power (W) 2200 pF 1000 pF 2.00 2.0 RL = 4 Ω 1% THD+N Ratio 1.5 1.50 1.0 RL = 8 Ω 10% THD+N Ratio 1.00 470 pF 0.50 0.5 RL = 8 Ω 1% THD+N Ratio No Filter 0.00 2.5 3 3.5 4 4.5 5 5.5 0.0 2.5 VBATT Supply Voltage (V) 3.0 3.5 4.0 4.5 5.0 5.5 VBATT Supply Voltage (V) Figure 38. Idle Current Draw vs. VBATT - HD Mode RL = 8 Ω + 33 μH (Note 18) 100% 100% 90% 90% 80% 80% 4.
PAGE 27
CS35L00 6.4 FHD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m 100m 200m 500m 1 2 3 W W Figure 44. THD+N vs. Output Power - FHD Mode RL = 8 Ω Figure 45. THD+N vs. Output Power - FHD Mode RL = 4 Ω 10 10 5 5 1.0 W 2 0.75 W 2 1 1 0.5 0.5 0.1 W 0.2 0.2 % 0.1 0.1 W % 0.1 0.05 0.05 0.5 W 0.
PAGE 28
CS35L00 3.5 4.50 4.00 3.0 RL = 4 Ω 10% THD+N Ratio 3.50 2.5 2200 pF Output Power (W) Idle Current Draw (mA) 3.00 2.50 1000 pF 2.00 2.0 RL = 4 Ω 1% THD+N Ratio 1.5 1.50 1.0 RL = 8 Ω 10% THD+N Ratio 1.00 470 pF 0.50 0.5 RL = 8 Ω 1% THD+N Ratio No Filter 0.00 2.5 3 3.5 4 4.5 5 0.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VBATT Supply Voltage (V) VBATT Supply Voltage (V) Figure 50. Idle Current Draw vs. VBATT - FHD Mode RL = 8 Ω + 33 μH (Note 19) Figure 51. Output Power vs.
PAGE 29
CS35L00 7. PARAMETER DEFINITIONS Signal to Noise Ratio (SNR) The ratio of the RMS value of the output signal, where Pout is equivalent to the specified output power at THD+N<1%, to the RMS value of the noise floor with no input signal applied and measured over the specified bandwidth, typically 20 Hz to 20 kHz. This measurement technique has been accepted by the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels.
PAGE 30
CS35L00 8. PACKAGING AND THERMAL INFORMATION 8.1 Package Drawings and Dimensions (Note 20) 10 PIN DFN DIM MIN A A1 D E L b e 0.034 0.000 0.114 0.114 0.014 0.008 -- INCHES NOM 0.035 0.001 0.118 0.118 0.016 0.009 0.019 MAX MIN MILLIMETERS NOM 0.037 0.002 0.122 0.122 0.018 0.012 -- 0.850 0.000 2.900 2.900 0.350 0.200 -- 0.900 0.020 3.000 3.000 0.400 0.250 0.500 NOTE MAX 0.950 0.050 3.100 3.100 0.450 0.300 -- 20 20 20 20 20 20 JEDEC #: MO-220 Controlling Dimension is Millimeters. Note: 20.
PAGE 31
CS35L00 8.2 Recommend PCB Footprint and Routing Configuration To ensure high-yield manufacturability, the PCB footprint for the CS35L00 should be constructed with strict adherence to the specifications given in IPC-610. Departure from this specification significantly increases the probability of solder bridging and other manufacturing defects. Routing of the traces into and out of the CS35L00 device should also be given consideration to avoid manufacturing issues. 8.
PAGE 32
CS35L00 8.4.1 Determining Maximum Ambient Temperature To determine (to a first order approximation) the maximum ambient temperature in which the CS35L00 will operate, the following equations can be used: T op = θ JA × ( ( 1 – η ) × P max ) T max = T TE – T op Where: Tmax = The maximum ambient temperature in which the device can operate. Top = The operating temperature of the device, given a dissipated power “Pmax” and a known thermal impedance “θJA”.
PAGE 33
CS35L00 9. ORDERING INFORMATION Product Description Package Pb-Free CS35L00 2.8 W Mono Audio 10-DFN Amplifier with selectable gain Yes Grade Temp Range Container Commercial -10° to +70°C Rail Order# CS35L00-CNZ Tape and Reel CS35L00-CNZR 10.REVISION HISTORY Release Changes A1 A2 Initial Release – Updated all output switching frequency references to fsw1 from 200 kHz to 192 kHz. – Updated all output switching frequency references to fsw2 from 80 kHz to 76 kHz.
PAGE 34
CS35L00 A2 – – – – – – – – – – – PP1 – – – – – – Updated Shutdown Supply Current specification (IA(SD)) in “Electrical Characteristics - All Operational Modes” on page 9. Added “MOSFET On Resistance” test conditions (Ibias = 0.5 A) in “Electrical Characteristics - All Operational Modes” on page 9. Section 5.1.1.1 SD Mode updated to remove references to edge rate control. Section 5.1.2.