参数资料
型号: CDB4245
厂商: Cirrus Logic Inc
文件页数: 47/59页
文件大小: 0K
描述: BOARD EVAL FOR CS4245 CODEC
标准包装: 1
主要目的: 音频编解码器
嵌入式: 是,FPGA / CPLD
已用 IC / 零件: CS4245
主要属性: 4 个单端模拟和 1 个麦克风输入和 8 个输出,S/PDIF 发射器和接收器
次要属性: 图形用户界面
已供物品:
产品目录页面: 754 (CN2011-ZH PDF)
相关产品: CS4245-DQZR-ND - IC CODEC AUD STER 104DB 48-LQFP
598-1616-ND - IC CODEC AUD STER 104DB 48LQFP
598-1034-ND - IC CODEC AUD STER 104DB 48LQFP
其它名称: 598-1501
CS4245
6.7
Channel B PGA Control - Address 07h
7
Reserved
6
Reserved
5
Gain5
4
Gain4
3
Gain3
2
Gain2
1
Gain1
0
Gain0
6.7.1
6.8
Channel B PGA Gain (Bits 5:0)
Function:
Channel A PGA Control - Address 08h
7
Reserved
6
Reserved
5
Gain5
4
Gain4
3
Gain3
2
Gain2
1
Gain1
0
Gain0
6.8.1
Channel A PGA Gain (Bits 5:0)
Function:
Sets the gain or attenuation for the ADC input PGA stage. The gain may be adjusted from -12 dB to
+12 dB in 0.5 dB steps. The gain bits are in two’s complement with the Gain0 bit set for a 0.5 dB step.
Register settings outside of the ±12 dB range are reserved and must not be used. See Table 15 for ex-
ample settings.
Gain[5:0]
101000
000000
011000
Setting
-12 dB
0 dB
+12 dB
Table 15. Example Gain and Attenuation Settings
6.9
ADC Input Control - Address 09h
7
Reserved
6
Reserved
5
Reserved
4
PGASoft
3
PGAZero
2
Sel2
1
Sel1
0
Sel0
6.9.1
DS656F3
PGA Soft Ramp or Zero Cross Enable (Bits 4:3)
Function:
Soft Ramp Enable
Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramp-
ing, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods.
See Table 16 .
Zero Cross Enable
Zero Cross Enable dictates that signal-level changes, either by attenuation changes or muting, will occur
on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a time-
out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal
does not encounter a zero crossing. The zero cross function is independently monitored and implemented
for each channel. See Table 16 .
Soft Ramp and Zero Cross Enable
Soft Ramp and Zero Cross Enable dictate that signal-level changes, either by attenuation changes or mut-
ing, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will
47
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