Low-Power Stereo Analog-to-Digital Converter
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.
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Technology
Features
- 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
- Independent left/right channel control
- Digital volume control with soft ramp and zero cross
- Flexible power-down management – chip/block selectable
Parametric Specifications
| Channels (Inputs) | 2 |
| Resolution (bits) | 24 |
| Dynamic Range (dB) | 98 |
| THD+N (dB) | -88 |
| Sample Rate (kHz) | 96 |
| Analog Inputs/Outputs | Differential |
| Analog Power Supply (V) | 1.8; 2.5 |
| Digital Power Supply (V) | 1.8; 2.5 |
| Logic Power Supply (V) | 1.8; 2.5; 3.3 |
| Operational Power Consumption (mW) | 7.1-22.5 |
| Package | 32 QFN |
