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| 型号： | XRD9825EVAL |
| 厂商： | Exar Corporation |
| 文件页数： | 20/33页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XRD9825 |
| 标准包装： | 1 |
| 系列： | * |
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XRD9825
27
Rev. 1.00
Serial Load Control Registers
The serial load registers are controlled by a three wire
serial interface through the bi-directional parallel port to
reduce the pin count of this device. When SYNCH is set
to high, the output bus is tri-stated and the serial
interface is activated. DB7/LD, DB5/SCLK and DB6/
SDATA are the three input signals that control this
process. The DB7/LD signal is set low to initiate the
loading of the internal registers.
There are internal registers that are accessed via an 11-
bit data string. Data is shifted in on the rising edge of
SCLK and loaded to the registers on the rising edge of
LD. The data on pin DB6/SDATA is latched automati-
cally after eleven DB5/SCLKs have been counted. If
eleven clocks are not present on DB5/SCLK before the
DB7/LD signal returns high, no data will be loaded into
the internal registers.
If more than 11 clocks are
present on DB5/SCLK, the additional clocks will be
ignored. The data corresponding to the first eleven
DB5/SCLKs will be loaded only.
The first three MSBs choose which internal register will
be selected. The remaining 8 LSBs contain the data
needed for programming the internal register for a
particular configuration.
Power-Up State of the Internal Registers
The control register settings upon initial power-up are
for CIS, DC Coupled configuration (VRT is set to
internal, Input DC Reference=AGND and the input to
the ADC is selected through the RED channel). Gain is
unity and Offset is set to zero. The test modes are
disabled in the power-up state.
DB6/SDATA
DB5/SCLK
SYNCH
S 2
S 1
S 0
D7
D2
D1
D0
DB7/LD
tdl
tdz
tsclkw
tds tdh
Figure 21. Write Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRD9826 | 制造商:EXAR 制造商全称:EXAR 功能描述:16-Bit Linear CIS/CCD Sensor Signal Processor with Serial Control |
| XRD9826ACD | 制造商:EXAR 制造商全称:EXAR 功能描述:16-Bit Linear CIS/CCD Sensor Signal Processor with Serial Control |
| XRD9826ACD-F | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| XRD9826ACU | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| XRD9826ACU-F | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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