CS42L51-CNZ

The CS42L51-CNZ belongs to CS42L51, which is a highly integrated, 24-bit, 96 kHz, low power stereo CODEC. Based on multi-bit, delta-sigma modulation, it allows infinite sample rate adjustment between 4 kHz and 96 kHz. Both the ADC and DAC offer 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 CS42L51-CNZ selects between line-level or microphone level inputs for each channel. The microphone input path includes a select-
able 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 DAC output path includes a digital signal processing engine. Tone Control provides bass and treble adjustment of four selectable corner frequencies. The Mixer CS42L51-CNZ allows independent volume control for both the ADC mix and the PCM mix, as well as a master digital volume control for the analog output. All volume level changes may be configured to occur on soft ramp and zero cross transitions. The DAC also includes de-em- phasis,  limiting functions and a beep generator delivering tones selectable across a range of two full octaves. The stereo headphone amplifier CS42L51-CNZ 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. In addition to its many features, the CS42L51 operates from a low-voltage analog and digital core, making this CODEC ideal for portable systems that require extremely low power consumption in a minimal amount of space. The CS42L51 is available in a 32-pin QFN package in both Commercial (-10 to +70° C) and Automotive grades (-40 to +85° C). The CDB42L51 Customer Dem- onstration board is also available for device evaluation and implementation suggestions. Please see "Ordering Information"on page 81 for complete details.

The features of CS42L51 are (1)24-bit converters ; (2)4 kHz to 96 kHz sample rate; (3)multi-bit delta sigma architecture; (4)low power operation: stereo playback: 12.93 mW @ 1.8 V; stereo record and playback: 20.18 mW @ 1.8 V; (5)variable power supplies: 1.8 V to 2.5 V digital & analog; 1.8 V to 3.3 V interface logic; (6)power down management: ADC, DAC, CODEC, MIC pre-amplifier, PGA; (7)software mode (I2C & SPI? control); (8)hardware mode (stand-alone control); (9)digital routing/mixes:analog out = ADC + digital in; digital out = ADC + digital in; internal digital loopback; mono mixes; (10)flexible clocking options; master or slave operation; high-impedance digital output option (for easy MUXing between CODEC and other data sources); quarter-speed mode - (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz).

The maximum absolute ratings of CS42L51 are(1)DC power supply, VA, VA_HP/VD/VL:-0.3 to 3.0V(analog)/-0.3 to 3.0V(digital)/-0.3 to 4.0(serial/control port interface); (2)input current(Note 2: any pin except supplies. transient currents of up to ±100 mA on the analog input pins will not cause SCR latch-up.)Iin:±10 mA(max); (3)analog input voltage(Note 3: The maximum over/under voltage is limited by the input current. )VIN: AGND-0.7 to VA+0.7 V; (4)digital input voltage,VIND: -0.3 to VL+ 0.4 V; (5)ambient operating temperature commercial-CNZ, TA:-20 to+85 °C; (6)(power applied)  automotive - DNZ,TA:-50 to +95 °C; (7)storage temperature, Tstg:-65 +150 °C.(WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes.)