CS4221-KSR Cirrus Logic Inc, CS4221-KSR Datasheet - Page 15

• Manufacturer Part Number: CS4221-KSR
• Description: Audio CODECs IC 24Bit Str Audio CODEC 3V Intrfc
• Manufacturer: Cirrus Logic Inc

Specifications of CS4221-KSR

• Number Of Adc Inputs: 2
• Number Of Dac Outputs: 2
• Conversion Rate: 48 KSPs
• Interface Type: Serial (I2C, SPI)
• Resolution: 24 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

5.2.4
5.3
5.4
5.4.1
DS284PP3
ATT7
7
0
SOFT RAMP STEP RATE (RMP)
Left Channel Output Attenuator Level (address 03h)
Right Channel Output Attenuator Level (address 04h)
ATTENUATION LEVEL (ATT7-ATT0)
Function:
Function:
Default = 00
00 - 1 step per 8 LRCK’s
01 - 1 step per 4 LRCK’s
10 - 1 step per 16 LRCK’s
11 - 1 step per 32 LRCK’s
The rate of change for the Soft Ramp function is adjustable through the RMP bits.
Default = 00h
The Output Attenuator Level registers allow for attenuation of the DAC outputs in 0.5 dB increments
from 0 to 113.5 dB. 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 this point, volume changes are performed
digitally. This technique is superior to purely digital volume control because the noise is attenuated
by the same amount as the signal, thus preserving dynamic range, see Figure 16. Volume changes
are performed as dictated by the SOFT bit in the DAC Control register. ATT0 represents 0.5 dB of
attenuation and settings greater than 227 (decimal value) will mute the selected DAC output.
ATT6
6
0
Binary Code
00000000
11100100
11100011
ATT5
5
0
Table 1. Example Volume Settings
Decimal Value
ATT4
4
0
227
228
0
ATT3
3
0
Volume Setting
-113.5 dB
Muted
0 dB
ATT2
2
0
CS4220 CS4221
ATT1
1
0
ATT0
0
0
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