参数资料
型号: CDB4245
厂商: Cirrus Logic Inc
文件页数: 49/59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
shown in Table 18 . The volume changes are implemented as dictated by the DACSoft and DACZero-
Cross bits in the DAC Control 2 register (see Section 6.12.1 ).
Binary Code Volume Setting
00000000 0 dB
00000001 -0.5 dB
00101000 -20 dB
00101001 -20.5 dB
11111110 -127 dB
11111111 -127.5 dB
Table 18. Digital Volume Control Example Settings
6.12
DAC Control 2 - Address 0Ch
7
DACSoft
6
DACZero
5
InvertDAC
4
Reserved
3
Reserved
2
Reserved
1
Reserved
0
Active_H/L
6.12.1 DAC Soft Ramp or Zero Cross Enable (Bits 7:6)
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 19 .
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 19 .
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
occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sam-
ple rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
itored and implemented for each channel. See Table 19 .
DACSoft DACZeroCross
Mode
0
0
1
1
0 Changes to affect immediately
1 Zero Cross enabled
0 Soft Ramp enabled
1 Soft Ramp and Zero Cross enabled (default)
Table 19. DAC Soft Cross or Zero Cross Mode Selection
6.12.2 Invert DAC Output (Bit 5)
Function:
When this bit is set, the output of the DAC is inverted.
DS656F3
49
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