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參數(shù)資料
| 型號： | AK4704 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 2ch 24bit DAC with AV SCART switch |
| 中文描述： | 2通道24位DAC，具有影音SCART開關 |
| 文件頁數(shù)： | 28/44頁 |
| 文件大?。?/td> | 440K |
| 代理商： | AK4704 |
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ASAHI KASEI
AKM CONFIDENTIAL
[AK4704]
Rev. 0.5
2004/1
- 28 -
5. Monitor Options and INT function
Monitor Options (08H: D3-D0)
The AK4704 has several monitors for the input DC level of VCR slow blanking, the input DC level of VCR fast blanking
and signals input to TVVIN or VCRVIN pins. SVCR1-0 bits, FVCR bit and VMON bit are reflected to these values.
SVCR1-0: VCR Slow blanking status monitor
SVCR1-0 reflect the voltage at VCRSB pin only when the VCRSB is in the input mode.
When the VCRSB is in the output mode, SVCR1-0 hold previous value.
VCRSB pin input level
< 2V
4.5 to 7V
(Reserved)
9.5<
Table 22. VCR Slow Blanking monitor
FVCR: VCR Fast blanking input level monitor
This bit is enabled when TVFB bit = “1”.
VCRFB pin input level
<0.4V
1 V<
Table 23. VCR Fast Blanking monitor (Typical threshold is 0.7V)
VMON : Video input monitor
0 : No video signal detected via TVVIN pin and VCRVIN pin.
1 : Detects video signal via TVVIN pin OR VCRVIN pin.
INT Function and Mask Options (09H: D3-D1)
Changes of the 08H status can be monitored via the INT pin. The INT pin is the open drain output and goes “L” for
2usec(typ.) when the status of 08H is changed. This pin should be connected to VD (typ. 5V) through 10kohm resister.
MVMON bit, MFVCR bit and MSVCR bit control the reflection of the status change of these monitors onto the INT pin
from report to prevent to masks each monitor
MVMON: Video input monitor mask.
AUTO
MVMON
Reflection of the change of VMON bit to INT pin
0
0
0
1
NOT reflect (e.g. masked)
1
0
1
1
Table 24. Reflection of VMON change
MFVCR: FVCR Monitor mask.
0 : Change of MFVCR is reflected to INT pin. (default)
1 : Change of MFVCR is NOT reflected to INT pin.
MSVCR: SVCR1-0 Monitor mask.
0 : Change of SVCR1-0 is reflected to INT pin. (default)
1 : Change of SVCR1-0 is NOT reflected to INT pin.
SVCR1
0
0
1
1
SVCR0
0
1
0
1
FVCR
0
1
Reflect
Reflect
Reflect
(default)
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