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參數(shù)資料
| 型號： | XRD9818ACGTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 16B CCD/CIS SIG PROC 28TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 16 |
| 通道數(shù)： | 3 |
| 功率（瓦特）： | 325mW |
| 電壓 - 電源，模擬： | 3 V ~ 3.6 V |
| 電壓 - 電源，數(shù)字： | 3 V ~ 3.6 V |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-TSSOP |
| 包裝： | 帶卷 (TR) |
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XRD9818
xr
3-CHANNEL 16-BIT LINEAR CCD/CIS SENSOR SIGNAL PROCESSOR
REV. 1.0.1
20
The affect of the XRD9818’s offset correction DAC’s (Course & Fine) is defined as follows:
The course DAC value, VOSCOURSE, is defined in Figure 10 and the Fine DAC value is determined as follows:
The XRD9818 offset adjustment range is designed to maximize the correction range whether being used in a
CCD or CIS application.
4.3
Programmable Gain
There are three independent PGA’s, one for each input channel: Red, Green and Blue. The individual gain
values are controlled by separate Red, Green and Blue gain registers.
Each PGA has 9 bits of control for the
full gain range. See Figure 12 for the PGA transfer function.
The gain increments in a binary fashion from a
minimum at code 0 to a maximum at code 511.
The PGA has two gain ranges 1x to 5x and 1.5x to 7.5x to help interface to imagers with 3V or 2V outputs
respectively.
To select the 1x to 5x gain range for an imager that has a 3V single swing the GS bit in the
MODE 1 register must be set low, GS=0 (default). To select the 1.5x to 7.5x gain range for use with imagers
that have a 2V maximum signal swing the GS bit in the MODE 1 register must be set high, GS=1.
The XRD9818 channel gain equations are as follows:
FIGURE 12. XRD9818 PGA TRANSFER FUNCTION
V
A = VInput - (VOSCourse + VOSFine )
note: positive offset values subtract from the input signal
VOS
Fine =
(
)
FBx[7]
Offset Code
127
150mV
FBx[6:0]
Note : FB[7] = 0 -> (+), FB[7] = 1 -> (-)
0
1
2
3
4
5
6
7
8
0
64
128
192 256
320 384
448 512
PGA Gain Code
Gain
(V/V)
GS=1
GS=0
Ga in
1 to 5 =
Ga in Code
511
4
1
Ga in
1.5 to 7.5 =
Ga in Code
511
6.0
1.5
or
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