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参数资料
| 型号： | AD9985ABSTZ-110 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE 8BIT 110MSPS 80LQFP |
| 标准包装： | 1 |
| 应用： | 视频 |
| 接口： | 串行 |
| 电源电压： | 2.2 V ~ 3.45 V |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-LQFP（14x14） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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AD9985
Rev. 0 | Page 18 of 32
Hex
Address
Write and
Read or
Read Only
Bits
Default
Value
Register Name
Function
*****0**
Bit 2 – Red Clamp Select. Logic 0 selects clamp to ground. Logic 1
selects clamp to midscale (voltage at Pin 37).
******0*
Bit 1 – Green Clamp Select. Logic 0 selects clamp to ground. Logic 1
selects clamp to midscale (voltage at Pin 37).
*******0
Bit 0 – Blue Clamp Select. Logic 0 selects clamp to ground. Logic 1
selects clamp to midscale (voltage at Pin 37).
11H
R/W
7:0
00100000
Sync Separator
Threshold
Sync Separator Threshold. Sets how many internal 5 MHz clock periods
the sync separator will count to before toggling high or low. This
should be set to some number greater than the maximum Hsync or
equalization pulsewidth.
12H
R/W
7:0
00000000
Pre-Coast
Pre-Coast. Sets the number of Hsync periods that Coast becomes
active prior to Vsync.
13H
R/W
7:0
00000000
Post-Coast
Post-Coast. Sets the number of Hsync periods that Coast stays active
following Vsync.
14H
RO
7:0
Sync Detect
Bit 7 – Hsync detect. It is set to Logic 1 if Hsync is present on the
analog interface; otherwise it is set to Logic 0.
Bit 6 – AHS: Active Hsync. This bit indicates which analog Hsync is
being used. (Logic 0 = Hsync Input Pin, Logic 1 = Hsync from Sync-on-
Green.)
Bit 5 – Input Hsync Polarity Detect. (Logic 0 = Active Low, Logic 1 =
Active High.)
Bit 4 – Vsync Detect. It is set to Logic 1 if Vsync is present on the analog
interface; otherwise it is set to Logic 0.
Bit 3 – AVS: Active Vsync. This bit indicates which analog Vsync is
being used. (Logic 0 = Vsync Input Pin, Logic 1 = Vsync from Sync
Separator.)
Bit 2 – Output Vsync Polarity Detect. (Logic 0 = Active Low, Logic 1 =
Active High.)
Bit 1 – Sync-on-Green Detect. It is set to Logic 1 if sync is present on
the Green video input; otherwise it is set to 0.
Bit 0 – Input Coast Polarity Detect. (Logic 0 = Active Low, Logic 1 =
Active High.)
15H
R/W
7:2
111111**
Reserved
Bits [7:2] Reserved for future use. Must be written to 111111 for proper
operation.
1
******1*
Output Formats
Bit 1 – 4:2:2 Output Formatting Mode (Logic 0 = 4:2:2 mode, Logic 1=
4:4:4 mode)
0
*******1
Reserved
Bit 0 – Must be set to 0 for proper operation.
16H
R/W
7:0
Test Register
Reserved for future use.
17H
RO
7:0
Test Register
Reserved for future use.
18H
RO
7:0
Test Register
Reserved for future use.
19H
R/W
7:0
00000100
Red Target Code
Target Code for Auto Offset Operation.
1AH
R/W
7:0
00000100
Green Target
Code
Target Code for Auto Offset Operation.
1BH
R/W
7:0
00000100
Blue Target
Code
Target Code for Auto Offset Operation.
1CH
R/W
7:0
00010001
Reserved
Must be written to 11h for proper operation.
1DH
R/W
7
0*******
Auto Offset
Enable
Enables the auto offset circuitry.
6
*0******
Hold Auto Offset
Holds the offset output of the auto offset at the current value.
5:2
**1001**
Reserved
Must be written to 9 for proper operation.
1:0
******10
Update Mode
Changes the update rate of the auto offset.
1EH
R/W
7:0
0000****
Test Register
Must be set to default value.
*The AD9985 updates the PLL divide ratio only when the LSBs are written to (Register 02H).
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