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.
| Part | Resolution (bits) | Dynamic Range (dB) | THD+N (dB) | Sample Rate (kHz) | Analog I/O | Power Supply (V) | Comments |  Package |
|---|---|---|---|---|---|---|---|---|
| CS53L21 | 24 | 98 | -88 | 96 | Single-ended | VA = 1.8 to 2.5; VD = 1.8 to 2.5; VL = 1.8 to 3.3 |
ADC, MUX, PGA, MIC-PRE | 32L QFN |
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