XRD9818 Datasheet, PDF (11/28 Pages) Exar Corporation – 3-CHANNEL 16-BIT LINEAR CCD/CIS SENSOR SIGNAL PROCESSOR

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XRD9818
3-CHANNEL 16-BIT LINEAR CCD/CIS SENSOR SIGNAL PROCESSOR
REV. 1.0.1
3.0 REGISTER MAP
INTERNAL REGISTER MAP
Register
Name
RED Gain
GREEN Gain
BLUE Gain
RED Offset
GREEN Offset
BLUE Offset
MODE 1
MODE 2
BSAMP_Delay
VSAMP_Delay
ADCLK_Delay
TEST
Address
Data Bits
A3 A2 A1 A0 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0 0 0 0 msb
lsb
0 0 0 1 msb
lsb
0 0 1 0 msb
lsb
0 0 1 1 COR[1] COR[0] FOR[7] FOR[6] FOR[5] FOR[4] FOR[3] FOR[2] FOR[1] FOR[0]
0 1 0 0 COG[1] COG[0] FOG[7] FOG[6] FOG[5] FOG[4] FOG[3] FOG[2] FOG[1] FOG[0]
0 1 0 1 COB[1] COB[0] FOB[7] FOB[6] FOB[5] FOB[4] FOB[3] FOB[2] FOB[1] FOB[0]
0 1 1 0 CH[2] CH[1] CH[0] GS
LC CCD_EN B/N C/R[2] C/R[1] C/R[0]
0 1 1 1 PD OE
L_pol ADC_pol B_pol
V_pol
1 0 0 0 BL[4] BL[3] BL[2] BL[1] BL[0] BT[4] BT[3] BT[2] BT[1] BT[0]
1 0 0 1 VL[4] VL[3] VL[2] VL[1] VL[0] VT[4] VT[3] VT[2] VT[1] VT[0]
1 0 1 0 A[4] A[3] A[2] A[1] A[0] DO[4] DO[3] DO[2] DO[1] DO[0]
1011
*
*
*
*
*
*
*
*
*
*
RESET/RB 1 1 1 1 Reset READ
Note: * Exar test bits, do not over write the default values.
Shaded cells represent unused bits.
RB[3] RB[2] RB[1] RB[0]
3.1 PGA Gain Registers
There are three PGA registers for individually programming the gain in the RED, GREEN, and BLUE channels.
Each gain register has 9 bits of resolution. Bits D[9:1] control the gain while bit D0 is N/A (don’t care). The
XRD9818 has two gain ranges to help interface to imagers that have 3V or 2V of output signal swing. The GS
bit, located in the MODE 1 register, defaults to GS=0 for a gain of 1x to 5x or if GS=1 the gain would be 1.5x to
7.5x. The gain range of 1 to 5x (GS=0) is intended for use with imagers that have a 3V output swing, while the
gain range 1.5 to 7.5x is intended for imagers with 2V or less of output swing. The coding for the PGA registers
is straight binary. See “Section 4.3, Programmable Gain” on page 20 for a functional description of the
XRD9818’s gain stage.
GAIN REGISTER SETTINGS
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Gain (V/V) Gain (V/V)
msb
000000000*
…
111111111
lsb N/A w/GS bit = 0* w/GS bit = 1
not
1x
1.5x
used
…
5x
…
7.5x
* Power-on default value
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