Описание
The CS42L52 is a highly integrated, low power stereo CODEC with headphone and Class D speaker amplifiers. The CS42L52 offers many features suitable for low power, portable system applications. The ADC input path allows independent channel control of a number of features. Input summing amplifiers mix and select line-level and/or microphone level inputs for each channel. The microphone input path includes a selectable programmable-gain pre-amplifier stage and a low noise MIC bias voltage supply. A PGA is available for line or microphone inputs and provides analog gain with soft ramp and zero cross transitions. The ADC also features a digital volume control with soft ramp transitions. A programmable ALC and Noise Gate monitor the input signals and adjust the volume levels appropriately. To conserve power, the ADC may be bypassed while still allowing full analog volume control. The DAC output path includes a digital signal processing engine with various fixed function controls. Tone Control provides bass and treble adjustment of four selectable corner frequencies. The Digital Mixer provides independent volume control for both the ADC output and PCM input signal paths, as well as a master volume control. Digital Volume controls may be configured to change on soft ramp transitions while the analog controls can be configured to occur on every zero crossing. The DAC also includes de-emphasis, limiting functions and a BEEP generator delivering tones selectable across a range of two full octaves. The stereo headphone amplifier is powered from a separate positive supply and the integrated charge pump provides a negative supply. This allows a ground-centered analog output with a wide signal swing and eliminates external DC-blocking capacitors.
- Stereo CODEC
- High Performance Stereo ADC & DAC
- 98 dB Dynamic Range (A-wtd)
- -88 dB THD+N
- Flexible Stereo Analog Input Architecture
- 4:1 Analog Input MUX
- 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 PreAmplifiers
- 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 Volume Control
- 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 ? @ 5.0 V
- 2 x 550 mW into 8 ? @ 3.7 V
- 2 x 230 mW into 8 ? @ 2.5 V
- High Mono Output Power at 10% THD+N
- 1 x 1.90 W into 4 ? @ 5.0 V
- 1 x 1.00 W into 4 ? @ 3.7 V
- 1 x 350 mW into 4 ? @ 2.5 V
- Direct Battery Powered Operation
- Battery Level Monitoring & Compensation
- 82% Efficiency 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 Capacitors Required
- Integrated Negative Voltage Regulator
- High Power Output at -75 dB THD+N
- 2 x 23 mW Into 16 ? @ 1.8 V
- 2 x 44 mW Into 16 ? @ 2.5 V
