參數(shù)資料
型號(hào)： AK5365
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 24-BIT 96KHZ ADC WITH SELETOR/PGA/ALCl
中文描述： 24位96kHz與SELETOR藝術(shù)發(fā)展局/美國(guó)PGA /淋巴瘤
文件頁(yè)數(shù)： 21/41頁(yè)
文件大?。?/td> 286K
代理商： AK5365
ASAHI KASEI
[AK5365
]
MS0164-E-01
2002/08
- 21 -
Input Volume
The AK5365 includes two independent channel analog volumes (IPGA) with 25 levels at 0.5dB steps located in front of
the ADC. The digital volume controls (DATT) have 128 levels (including MUTE) and is located after the ADC. Both the
analog and digital volumes are controlled through the same register address. When the MSB of the register is “1”, the
IPGA changes and when the MSB = “0”, the DATT changes.
The IPGA is a true analog volume control that improves the S/N ratio as seen in Table 10. Independent zero-crossing
detection is used to ensure level changes only occur during zero-crossings. If there are no zero-crossings, the level will then
change after a time-out period (Table 11); the time-out period scales with fs. If a new value is written to the IPGA register
before the IPGA changes at the zero crossing or time-out, the previous value becomes invalid. The timer (channel
independent) for time-out is reset and the timer restarts for new IPGA value.
The DATT is a pseudo-log volume that is linear-interpolated internally. When changing the level, the transition between
ATT values has 8031 levels and is done by soft changes, eliminating any switching noise.
Input Gain Setting
+6dB
100dB
0dB
103dB
+12dB
96dB
fs=48kHz, A-weight
Table 10. PGA+ADC S/N
ZTM1
0
0
1
1
ZTM0
0
1
0
1
Zero crossing timeout period
288/fs
1152/fs
2304/fs
4608/fs
Table 11. Zero crossing timeout period
@fs=48kHz
6ms
24ms
48ms
96ms
Default
[Writing operation at ALC Enable]
Writing to the area over 80H (Table 17) of IPGL/R registers is ignored during ALC operation. After ALC is disabled,
the IPGA changes to the last written data by zero-crossing or time-out. In case of writing to the DATT area under 7FH
(Table 17) of IPGL/R registers, the DATT changes even if ALC is enabled.
相關(guān)PDF資料
PDF描述
AK5365VQ 24-BIT 96KHZ ADC WITH SELETOR/PGA/ALCl
AK5366VR 24-Bit 48kHz ツヒ ADC with Selector/PGA/ALC
AK5366 Circular Connector; No. of Contacts:6; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-6 RoHS Compliant: No
AK5366VQ Circular Connector; No. of Contacts:6; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-6 RoHS Compliant: No
AK5370 Circular Connector; No. of Contacts:6; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-6 RoHS Compliant: No
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