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| 型号： | AD9981KSTZ-80 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/44页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE 10BIT ANALOG 80LQFP |
| 标准包装： | 90 |
| 应用： | 视频 |
| 接口： | 模拟 |
| 电源电压： | 3.13 V ~ 3.47 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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AD9981
Rev. 0 | Page 19 of 44
FIELD 1
FIELD 0
SYNC SEPARATOR THRESHOLD
FIELD 1
FIELD 0
23
2
1
4
31
HSYNCIN
VSYNCIN
VSYNCOUT
O/E FIELD
EVEN FIELD
QUADRANT
04739-018
Figure 12. Vsync Filter—Odd/Even
Power Management
To meet display requirements for low standby power, the
AD9981 includes a power-down mode. The power-down state
can be controlled manually (via Pin 17 or Register 0x1E, Bit 3),
or completely automatically by the chip. If automatic control is
selected (0x1E, Bit 4), the AD9981’s decision is based on the
status of the sync detect bits (Register 0x24, Bits 2, 3, 6, and 7). If
either an Hsync or a sync-on-green input is detected on any
input, the chip powers up, or else it powers down. For manual
control, the AD9981 allows flexibility of control through both a
dedicated pin and a register bit. The dedicated pin allows a
hardware watchdog circuit to control power-down, while the
register bit allows power-down to be controlled by software.
With manual power-down control, the polarity of the power-
down pin must be set (0x1E, Bit 2) regardless of whether the pin
is used. If unused, it is recommended to set the polarity to active
high and hardwire the pin to ground with a 10 k resistor.
In power-down mode, there are several circuits that continue to
operate as normal. The serial register and sync detect circuits
maintain power so that the AD9981 can be woken up from
its power-down state. The bandgap circuit maintains power
because it is needed for sync detection. The sync-on-green and
SOGOUT functions continue to operate because the SOGOUT
output is needed when sync detection is performed by a
secondary chip. All of these circuits require minimal power to
operate. Typical standby power on the AD9981 is about 50 mW.
There are two options that can be selected when in power-
down. These are controlled by Bits 0 and 1 in Register 0x1E. The
first bit controls whether the SOGOUT pin is in high impe-
dance or not. In most cases, the user will not place SOGOUT in
high impedance during normal operation. The option to put
SOGOUT in high impedance is included mainly to allow for
factory testing modes. The second option keeps the AD9981
powered up while placing only the outputs in high impedance.
This option is useful when the data outputs from two chips are
connected on a PCB and the user wants to switch
instantaneously between the two.
Table 10. Power-Down Control and Mode Descriptions
Inputs
Mode
Auto Power-Down
Control1
Power-Down2
Sync Detect3
Powered-On or Comments
Power-Up
1
X
1
Everything
Power-Down
1
X
0
Only the serial bus, sync activity detect,
SOG, bandgap reference
Power-Up
0
X
Everything
Power-Down
0
1
X
Only the serial bus, sync activity detect,
SOG, bandgap reference
1 Auto power-down control is set by Register 0x1E, Bit 4.
2 Power-down is controlled by OR’ing Pin 17 with Register 0x1E, Bit 3. The polarity of Pin 17 is set by Register 0x1E, Bit 2.
3 Sync detect is determined by OR’ing Register 0x24, Bits 2, 3, 6, and 7.
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| AD9981KSTZ-95 | 功能描述:IC INTERFACE 10BIT ANALOG 80LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD9981XSTZ-110 | 制造商:Analog Devices 功能描述:HIGH PERFORMANCE 10-BIT DISPLAY INTERFACE - Bulk |
| AD9983A | 制造商:AD 制造商全称:Analog Devices 功能描述:High Performance 8-Bit Display Interface |
| AD9983A/PCB | 制造商:AD 制造商全称:Analog Devices 功能描述:High Performance 8-Bit Display Interface |
| AD9983A/PCBZ | 功能描述:KIT EVALUATION AD9983A RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:Advantiv® 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
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