CS4205 Datasheet, PDF (71/80 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with Portable Computing

CS4205
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 V_RMS (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 V_RMS
(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 V_RMS (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 V_RMS (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.
AFLT1 - Left ADC Channel Antialiasing Filter, Input, Pin 29
This pin needs a 1000 pF NPO capacitor connected to analog ground.
AFLT2 - Right ADC Channel Antialiasing Filter, Input, Pin 30
This pin needs a 1000 pF NPO capacitor connected to analog ground.
AFLT3 - Mic ADC Channel Antialiasing Filter, Input, Pin 31
This pin needs a 1000 pF NPO capacitor connected to analog ground.
DS489PP2
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