CS42L56 | 深圳环洋伟业科技有限公司

Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

The CS42L56 is a highly integrated, 24-bit, ultra-low-power stereo CODEC based on multi-bit delta-sigma modulation. Both the ADC and DAC offer many features suitable for low power portable system applications.

The CS42L56 includes a stereo ADC, stereo DAC, and stereo headphone driver. The analog input path includes independent channel control of a variety of features including a Programmable Gain Amplifier, digital volumecontrol with soft ramp transitions, and an analog pass-through mode for low power operation. It also includes an analog input mux and mic bias generation for supporting a variety of analog audio inputs. The DAC output includes a DSP engine with parametric EQ, volume control, limiting functions, and a beep generator. The Class H stereo headphone amplifier combines the efficiency of an integrated step-down and inverting charge pump with the linearity and low EMI of a Class AB amplifier. The output is ground centered, eliminating the need for large DC blocking capacitors.

The CS42L56 is available in a 40-pin QFN package for the Commercial (-40 to +85° C) grade. The CDB42L56 Customer Demonstration board is also available for device evaluation and implementation suggestions.

DIGITAL to ANALOG FEATURES

5 mW Stereo Playback Power Consumption
99 dB Dynamic Range (A-wtd)
-86 dB THD+N
Digital Signal Processing Engine
- Bass & Treble Tone Control, De-emphasis
- Master Volume Control (+12 to -102 dB in 0.5 dB steps)
- Soft-ramp & Zero-cross Transitions
- Programmable Peak-detect and Limiter
- Beep Generator w/ Full Tone Control

Stereo Headphone and Line Amplifiers

Step-down/Inverting Charge Pump
Class H Amplifier - Automatic Supply Adj.
- High Efficiency
- Low EMI
Pseudo-differential Ground-centered Outputs
High HP Power Output at -75 dB THD+N
- 2 x 20 mW Into 16 Ω @ 1.8 V
1 VRMS Line Output @ 1.8 V
Analog Vol. Ctl. (+12 to -60 dB in 1 dB steps)
Analog In to Analog Out Passthrough
Pop and Click Suppression

ANALOG to DIGITAL FEATURES

3.5 mW Stereo Record Power Consumption
95 dB Dynamic Range (A-wtd)
-87 dB THD+N
Configurable Analog Inputs
- Two Pseudo-differential Stereo Inputs or
- One Pseudo-differential Stereo Inputs + One Standard Stereo Input + One Standard Mono Input or
- Three Standard Stereo Inputs
- Pseudo-differential Inputs Reduce Common Mode Signal Noise
- 3:1 Stereo Input MUX for ADC or Passthrough
Analog Programmable Gain Amplifier (PGA)
- +12 to -6 dB in 0.5 dB steps
- +10 dB or +20 dB Additional Gain for Microphone Inputs
Programmable, Low-noise MIC Bias Output
Programmable Automatic Level Control (ALC)
- Noise Gate for Noise Suppression
- Programmable Threshold & Attack/Release Rates
Independent ADC Channel Control
High-pass Filter Disable for DC Measurements

SYSTEM FEATURES

Audio (11.2896 MHz or 12.288 MHz) or USB (12 MHz) Master Clock Input
Low-power Operation
- Stereo Anlg. Passthrough: 3.3 mW @1.8 V
- Stereo Rec. and Playback: 8.3 mW @1.8 V
Headphone Detect Input
High Performance 24-bit Converters
- Multi-bit Delta Sigma Architecture
Integrated High Efficient Power Management Reduces Power Consumption
- Step-down Charge Pump Improves Efficiency
- Inverting Charge Pump Accommodates Low System Voltage by Providing Negative Rail for HP/Line Amp
- LDO Reg. Provides Low Digital Supply Voltage
Digital Power Reduction
- Very Low ADC/DAC Oversampling Rate
- Bursted Serial Clock Providing up to 24 Bits per Sample
Power Down Management
- ADC, DAC, CODEC, PGA, DSP
Analog & Digital Routing/Mixes
- Line/Headphone Out = Analog In (ADC Bypassed)
- Line/Headphone Out = ADC Out
- Internal Digital Loopback
- Mono Mixes
I²C® or SPI™ Control Port
I²S or Left-justified Digital Interface Format
Flexible Clocking Options
- Master or Slave Operation
- Wide Range of Sample Rates Supported

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