CS4294SLASHCS4298 datasheet(72/81 Pages) CIRRUS

72 / 81 page

CS4205

DS489PP4

VIDEO_L, VIDEO_R - Analog Video Audio Source, Inputs, Pins 16 and 17

These inputs form a stereo input pair to the CS4205. It is intended to be used for the audio signal

output of a video device. The maximum allowable input is 1 VRMS (sinusoidal). These inputs are

internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. If these

inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog ground.

AUX_L, AUX_R - Analog Auxiliary Source, Inputs, Pins 14 and 15

These inputs form a stereo input pair to the CS4205. The maximum allowable input is 1 VRMS

(sinusoidal). These inputs are internally biased at the Vrefout voltage reference and require AC-coupling

to external circuitry. If these inputs are not used, they should both be connected to the Vrefout pin or

AC-coupled to analog ground.

LINE_OUT_L, LINE_OUT_R - Analog Line-Level, Outputs, Pins 35 and 36

These signals are analog outputs from the stereo output mixer. The full-scale output voltage for each

output is nominally 1 VRMS (sinusoidal). These outputs are internally biased at the Vrefout voltage

reference and require either AC-coupling to external circuitry or DC-coupling to a buffer op-amp biased

at the Vrefout voltage. These pins need a 680-1000 pF NPO capacitor attached to analog ground.

MONO_OUT - Analog Mono Line-Level, Output, Pin 37

This signal is an analog output from the stereo-to-mono mixer. The full-scale output voltage for this

output is nominally 1 VRMS (sinusoidal). This output is internally biased at the Vrefout voltage reference

and requires either AC-coupling to external circuitry or DC-coupling to a buffer op-amp biased at the

Vrefout voltage. This pin needs a 680-1000 pF NPO capacitor attached to analog ground.

Analog Reference, Filter, and Configuration Pins

REFFLT - Internal Reference Voltage, Input, Pin 27

This signal is the voltage reference used internal to the CS4205. A 0.1

µF and a 2.2 µF ceramic

capacitor with short, wide traces must be connected to this pin. No other connections should be made

to this pin. Do not use an electrolytic 2.2

µF capacitor, use a type Z5U or Y5V ceramic capacitor.

Vrefout - Voltage Reference, Output, Pin 28

All analog inputs and outputs are centered around Vrefout, nominally 2.4 Volts. This pin may be used to

bias external amplifiers. It can also drive up to 5 mA of DC which can be used for microphone bias.

CS4294/CS4298 数据表(PDF) 72 Page - Cirrus Logic