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| 型号： | XRD9827ACD-F |
| 厂商： | Exar Corporation |
| 文件页数： | 24/36页 |
| 文件大小： | 0K |
| 描述： | IC 12B CCD/CIS SIG PROC 20SOIC |
| 产品变化通告： | Obsolescence Notification 15/Apr/2010 |
| 标准包装： | 37 |
| 位数： | 12 |
| 通道数： | 3 |
| 电压 - 电源，模拟： | 3 V ~ 5.5V |
| 电压 - 电源，数字： | 3 V ~ 5.5 V |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
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XRD9827
30
Rev. 3.00
Mode 2. DC Coupled
Typical CCDs have outputs with black references.
Therefore, DC Coupled is not recommended for CCD
applications.
Offset Control DAC
The offset DAC is controlled by 8 bits. The offset range
is 800 mV ranging from -200 mV to +600 mV (when DB5
is set to 0) and -400 mV to +400 mV (when DB5 is set
to 1). Therefore, the resolution of the 8-Bit offset DAC
is 3.14 mV. However, the XRD9827 has +/- 100 mV
reserved for internal offsets. Therefore, the effective
range for adjusting for CIS offsets or black reference is
600 mV. The offset adjustment is used primarily to
correct for the difference between the black level of the
image sensor and the bottom ladder reference voltage
(VRB) of the ADC. By adjusting the black level to
correspond to VRB, the entire range of the ADC can be
used.
If the offset of the CIS output is greater than 500 mV an
external reference can be applied to VDCEXT. The
external reference can be used to adjust for large
offsets only when the internal mode is configured
through the serial port.
Since the offset DAC adjustment is done before the
gain stage, it is gain-dependent. For example, if the
gain needs to be changed between lines (red to blue,
etc.), the offset is calibrated before the signal passes
through the PGA.
PGA (Programmable Gain Amplifier) DAC
The gain of the input waveform is controlled by a 6-Bit
PGA. The PGA is used along with the offset DAC for
the purpose of using the entire range of the ADC. The
PGA has a linear gain from 1 to 10. Figure 20 is a plot
of the transfer curve for the PGA gain.
PGA GAIN TRANSFER CURVE
GAIN 1 - 10
1
2
3
4
5
6
7
8
9
10
0
10
20
30
40
50
60
CODE
GAIN
Figure 20. Transfer Curve for the 6-Bit PGA
After the signal is level shifted to correspond with the
bottom ladder reference voltage, the system can be
calibrated such that a white video pixel can represent
the top ladder reference voltage to the ADC. This allows
for a full scale conversion maximizing the resolution of
the ADC.
Analog to Digital Converter
The ADC is a 12-Bit, 10 MSPS analog-to-digital con-
verter for high speed and high accuracy. The ADC uses
a subranging architecture to maintain low power con-
sumption at high conversion rates. The output of the
ADC is on 8-bit databus. The 8-bit databus supports
6x6 or 8x4 output data. ADCCLK samples the input on
its falling edge. After the input is sampled, the MSB is
latched to the output drivers. On the rising edge of the
ADCCLK, the LSB is latched to the output drivers. The
output needs to be demultiplexed with external circuitry
or a digital ASIC. There is an 8 clock cycle latency
(Config 00, 11) or 6 pixel count latency (Config 01, 10)
for the analog-to-digital converter.
The V
RT and VRB reference voltages for the ADC are
generated internally, unless the external V
RT
is se-
lected. In the external V
RT mode, the VRT voltage is set
through the VREF+ pin. This allows the user to select
the dynamic range of the ADC.
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相关代理商/技术参数 |
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| XRD9827ACDTR-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 |
| XRD9827ACU | 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 |
| XRD9827ACU-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 |
| XRD9827ACUTR-F | 制造商:Exar Corporation 功能描述:AFE Video 1ADC 12-Bit 3.3V 20-Pin SSOP T/R 制造商:Exar Corporation 功能描述:XRD9827ACUTR-F |
| XRD9827EVAL | 功能描述:数据转换 IC 开发工具 XRD9827 EVAL BOARD RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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