CS4222-KS Cirrus Logic Inc, CS4222-KS Datasheet - Page 11

• Manufacturer Part Number: CS4222-KS
• Description: Audio CODECs IC 20-Bit Stereo Codec w/Vol Cntrl
• Manufacturer: Cirrus Logic Inc

Specifications of CS4222-KS

• Number Of Adc Inputs: 2
• Number Of Dac Outputs: 2
• Conversion Rate: 48 KSPs
• Interface Type: Serial (I2C, SPI)
• Resolution: 20 bit
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 10 C
• Number Of Channels: 2 ADC, 2 DAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Analog/Digital Volume Control - Control Port
Mode Only
The DAC outputs are each routed through an at-
tenuator which is adjustable in 0.5 dB steps.
Output attenuation is available through the Out-
put Attenuator Data Bytes (#3 & #4). Level
changes are implemented with an analog volume
control until the residual output noise is equal to
the noise floor in the mute state at which point
volume changes are performed digitally. This
technique is superior to purely digital volume
control techniques as the noise is attenuated by
the same amount as the signal, thus preserving
dynamic range (see Figure 5).
The CS4222 implements a "soft" volume control
whereby level changes are achieved by ramping
DS236PP3
Figure 4.
from the current level to the new level in 0.5 dB
steps. The default rate of volume change is 8
LRCK cycles for each 0.5 dB step (equivalent to
647 s at Fs = 48 kHz). The rate of volume
Figure 5. Hybrid Analog/Digital Attenuation
0
0
Analog Digital
Noise
Attenuation (dB)
Signal
CS4222
-113.5
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