CS42888-CQZ Cirrus Logic Inc, CS42888-CQZ Datasheet - Page 24

• Manufacturer Part Number: CS42888-CQZ
• Description: IC,Soundcard Circuits,CMOS,QFP,64PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc
• Type: Audio Codecr

Specifications of CS42888-CQZ

• Data Interface: Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 4 / 8
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 105 / 108 (Differential), 102 / 105 (Single-Ended)
• Voltage - Supply, Analog: 3.14 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 5.25 V
• Operating Temperature: -10°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• No. Of Adcs: 2
• No. Of Dacs: 4
• No. Of Input Channels: 8
• No. Of Output Channels: 4
• Adc / Dac Resolution: 24bit
• Ic Interface Type: Serial
• Supply Voltage Range: 3.14V To 5.25V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 598-1183

24
4. APPLICATIONS
4.1
4.2
4.2.1
Overview
The CS42888 is a highly integrated mixed signal 24-bit audio CODEC comprised of 4 analog-to-digital con-
verters (ADC) implemented using multi-bit delta-sigma techniques and 8 digital-to-analog converters (DAC)
also implemented using multi-bit delta-sigma techniques.
Other functions integrated within the CODEC include independent digital volume controls for each DAC, dig-
ital de-emphasis filters for the DAC, digital volume control with gain on each ADC channel, ADC high-pass
filters, an on-chip voltage reference, and Popguard technology that minimizes the effects of output tran-
sients on power-up and power-down.
All serial data is transmitted through two independent serial ports: the DAC serial port and the ADC serial
port. Each serial port can be configured independently to operate at different sample and clock rates, but
both must run synchronous to each other.
The serial audio interface ports allow up to 8 DAC channels and 6 ADC channels in a Time-Division Multi-
plexed (TDM) interface format. In the One-Line Mode (OLM) interface format, the CS42888 will allow up to
6 ADC channels on one data line and up to 8 DAC channels on 2 data lines.
The CS42888 features an Auxiliary Port used to accommodate an additional two channels of PCM data on
the ADC_SDOUT data line in the TDM digital interface format. See
page 33
The CS42888 operates in one of three oversampling modes based on the input sample rate. When operat-
ing the CODEC as a slave, mode selection is determined automatically based on the MCLK frequency set-
ting. When operating as a master, mode selection is determined by the ADC and DAC FM bits in register
“Functional Mode (Address 03h)” on page
to 50 kHz and uses a 128x oversampling ratio. Double-Speed Mode (DSM) supports input sample rates up
to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed Mode (QSM) supports input sample rates
up to 200 kHz and uses an oversampling ratio of 32x (Note: QSM for the ADC is only supported in the I²S,
Left-Justified, Right-Justified interface formats. QSM for the DAC is supported in the I²S, Left-Justified,
Right-Justified and Time Division Multiplexed interface formats).
All functions can be configured through software via a serial control port operable in SPI Mode or in I²C
Mode.
Figure 2 on page 16
page 40
Analog Inputs
Line-Level Inputs
AINx+ and AINx- are the line-level differential analog inputs internally biased to VQ, approximately VA/2.
Figure 10 on page 25
ended signals on all inputs, AIN1-AIN4. See
filters.
For single-ended operation on ADC1-ADC2 (AIN1 to AIN4), the ADCx_SINGLE bit in the register
Control & DAC De-Emphasis (Address 05h)” on page 44
page 51
The gain/attenuation of the signal can be adjusted for each AINx independently through the
Control (Address 11h-14h)” on page
for details.
for the default register settings and options.
for required external components).
shows the recommended connections for the CS42888. See
shows the full-scale analog input levels. The CS42888 also accommodates single-
48.
42. Single-Speed Mode (SSM) supports input sample rates up
“ADC Input Filter” on page 51
must be set appropriately (see
“AUX Port Digital Interface Formats” on
for the recommended input
“Register Description” on
“AINX Volume
CS42888
Figure 26 on
DS717F2
“ADC