The CS53L21 is a highly integrated, 24-bit, 96 kHz, low-power stereo audio A/D converter (ADC). Based on multibit, Delta-Sigma modulation, it allows infinite sample rate adjustment between 4 kHz and 96 kHz and offers many features suitable for low power, portable-system applications. The ADC input path allows independent channel control of a number of features. An input multiplexer selects between line-level 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 attenuator with soft ramp transitions. A programmable ALC and Noise Gate monitor the input signals and adjust the volume levels appropriately. The Signal Processing Engine (SPE) controls left/right channel volume mixing, channel swap and channel mute functions. All volume-level changes may be configured to occur on soft ramp and zero cross transitions. In addition to its many features, the CS53L21 operates from a single, low-voltage analog and digital core power supply, making this ADC ideal for applications such as portable audio players, digital microphones, digital voice recorders, voice recognition systems and audio/video capture cards.
- Independent left/right channel control
- Digital volume control with soft ramp and zero cross
- High-pass filter disable for DC measurements
- Master or slave mode operation
- Hardware or software control
- 98 dB dynamic range
- -88 dB THD+N
- 24-bit conversion, up to 96 kHz sample rates
- Flexible power-down management – chip/block selectable
- Low-power audio A/D converter
- Stereo record (ADC): 8.72 mW @ 1.8 V
- Stereo record (MIC to PGA and ADC): 13.73 mW @ 1.8 V
- Operates from a single 1.8 V or 2.5 V supply
- Supports direct interface to logic levels from 1.8 V to 3.3 V
- 3:1 Stereo input selector
- Analog gain controls
- PGA, +12 dB to -3 dB in 0.5 dB steps
- +32 dB or +16 dB stereo MIC pre-amp with bias supply
- Programmable automatic level control
- Noise gate for noise suppression
- Programmable threshold and attack/release rates
- Package: 32 QFN; lead-free assembly
- Applications: Portable audio players, digital microphones, digital voice recorders, voice recognition systems and audio/video capture cards
