CS42L52

Low Power CODEC with Class D Speaker Driver

Overview

Description

The CS42L52 is a 24-bit low-power stereo CODEC noted for its high levels of integration and high-performance audio output. Providing up to one watt-per-channel of highly efficient Class D amplification to external speakers, or enough power to drive 44 milliwatts per channel into stereo headphones, the CS42L52 offers the flexibility to run its core from a single power supply and directly connect the Class-D amplifier to the battery supply for a more efficient operation. This IC is ideal for portable consumer electronics applications such as portable media players, game devices, MP3 player accessories, IC recorders, digital cameras and camcorders.

The CS42L52 builds upon the innovative design techniques of Cirrus Logic’s recently introduced low-power audio CODECs by creating its own on-chip negative power supply voltage. With its ground-centered outputs, the CS42L52 helps to reduce clicks and pops during start up, improves low-end frequency response and eliminates costly, space-consuming DC blocking capacitors. The elimination of these capacitors reduces costs, simplifies product designs and enables smaller product form factors. The CODEC also features enhanced master clock support, which includes standard audio frequencies, as well as USB and video clocks.

The CS42L52 utilizes a 40-pin QFN package and consumes only 13 milliwatts of power at 1.8 volts in playback mode while driving stereo headphones.

Features

Stereo CODEC

• High Performance Stereo ADC & DAC
• 99 dB (ADC),98 dB (DAC) Dynamic Range (A-wtd)
• -88 dB THD+N
• Flexible Stereo Analog Input Architecture
• 4:1 Analog Input MUXr
• Analog Input Mixing
• Analog Pass-Thru with Volume Control
• Analog Programmable Gain Amplifier (PGA)
• Programmable Automatic Level Control (ALC)
• Noise Gate for Noise Suppression
• Programmable Threshold & Attack/Release Rates
• Dual MIC Inputs
• Differential or Single-Ended
• +16 dB to +32 dB w/1dB step MIC Pre-Amplifiers
• Programmable, Low Noise MIC Bias Levels
• Digital Signal Processing Engine
• Bass & Treble Tone Control, De-Emphasis
• Master Vol. and Independent PCM SDIN + ADC SDOUT Mix Vol. Ctl.
• Soft-Ramp & Zero-Cross Transitions
• Programmable Peak-Detect and Limiter
• Beep Generator w/Full Tone Control

Class D Stereo/Mono Speaker Amplifier

• No External Filter Required
• High Stereo Output Power at 10% THD+N
• 2 x 1.00 W into 8 Ω @ 5.0 V
• 2 x 550 mW into 8 Ω @ 3.7 V
• 2 x 230 mW into 8 Ω @ 2.5 V
• High Mono Output Power at 10% THD+N
• 1 x 1.90 W into 4 Ω @ 5.0 V
• 1 x 1.00 W into 4 Ω @ 3.7 V
• 1 x 350 mW into 4 Ω @ 2.5 V
• Direct Battery Powered Operation
• Battery Level Monitoring & Compensation
• 82% at 800 mW
• Phase-Aligned PWM Output Reduces Idle Channel Current
• Spread Spectrum Modulation
• Low Quiescent Current

Stereo Headphone Amplifier

• Ground Centered Outputs
• No DC-Blocking Capacitor Required
• Integrated Negative Voltage Regulator
• High Power Output at -75 dB THD+N
• 2 x 23 mW Into 16 Ω @ 1.8 V
• 2 x 44 mW Into 16 Ω @ 2.5 V

System Features

• 12, 24, and 27 MHz Master Clock Support in Addition to Typical Audio Clock Rates
• High Performance 24-bit Converters
• Multi-bit Delta Sigma Architecture
• Very Low 64Fs Oversampling Clock Reduces Power Consumption
• Low Power Operation
• Stereo Analog Passthrough: 10 mW @ 1.8 V
• Stereo Playback: 14 mW @ 1.8 V
• Stereo Record and Playback: 23 mW @ 1.8 V
• Variable Power Supplies
• 1.8 V to 2.5 V Digital & Analog
• 2.5 V to 5 V Class D Amplifier
• 1.8 V to 2.5 V Headphone Amplifier
• 1.8 V to 3.3 V Interface Logic
• Power Down Management
• ADC, DAC, CODEC, MIC Pre-Amplifier, PGA, Headphone Amplifier, Speaker Amplifier
• Analog & Digital Routing/Mixes:
• Line/Headphone Out = Analog In (ADC Bypassed)
• Line/Headphone/Speaker Out = ADC + Digital In
• Digital Out = ADC + Digital In
• Internal Digital Loopback
• Mono Mixes
• Flexible Clocking Options
• Master or Slave Operation
• High Impedance Digital Output Option (for easy MUXing between CODEC & other data sources)
• Quarter-Speed Mode - (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz)
• 4 kHz to 96 kHz Sample Rates
• I²C Control Port Operation
• Temperature Monitor & Shutdown
• Headphone/Speaker Detection Input
• Pop and Click Suppression

Diagram

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