Ultra Low Power, Stereo Codec with Class H Headphone Amplifier
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 volume control 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.
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Technologies
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
- Main 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
- 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
- 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
- Audio (11.2896 MHz or 12.288 MHz) or USB (12 MHz) main clock input
- Low-power operation
- Stereo analog passthrough: 3.3 mW @1.8 V
- Stereo record 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
- Main or secondary operation
- Wide range of sample rates supported
Parametric Specifications
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