xr
JUNE 2003
XRD9836
16-BIT PIXEL GAIN AFE
REV. 1.0.0
GENERAL DESCRIPTION
The XRD9836 is a precision 16-bit analog front-end
(AFE) for use in 3-channel/1-channel CCD/CIS docu-
ment imaging applications. Pixel-by-pixel gain and
offset for each of the 3 channels are controlled using
a time multiplexed parallel input. Offset and Gain are
sequentially supplied for red, green, and blue. The
outputs from each of the three channels are transmit-
ted time multiplexed with the high order byte first fol-
lowed by the low order byte for red, blue and green.
FEATURES
•
16-bit resolution ADC, 30MHz Sampling Rate
•
10-bit accurate linear programmable gain range select-
able as either 2-to-20 V/V or 1-to-10 V/V per channel
•
Sampling rates from 1.0 MSPS to 10.0 MSPS per chan-
nel for 3 -Channel mode and up to 15.0 MSPS in single
channel mode.
•
Pixel-by-Pixel Offset and Gain control through a parallel
interface running at a maximum 60 Mbyte/sec. data rate
•
A microprocessor serial port to control various modes of
operation
•
Fixed Gain/Offset Mode (FGOM) or Pixel by Pixel Gain/
Offset Mode (PPGOM)
•
Alternate Pixel Offset Adjust Mode (APOAM)
•
Low Power CMOS=280mW (typ. @ 3V); Power-Down
Mode=1mW (typ. @ 3V with static clocks)
•
Single Power Supply (3.0 to 3.6 Volts) with Max CCD
input signal of 1V and reset pulse up to 0.5V
•
Fully-differential input pins and internal path
•
High ESD Protection: 2000 Volts Minimum
APPLICATIONS
•
Scanners, MFP’s
F
IGURE
1. B
LOCK
D
IAGRAM
IE
GRN+
RED-
RED+
GRN-
BLUE+
BLUE-
CAPP
CAPN
CMREF
REXT
BIAS
RED HIGH ORDER
ADC OUT
RED LOW ORDER
ADC OUT
ANALOG INPUTS
RED GAIN
REGISTER
RED OFFSET
REGISTER
Red Gain
10
10
Red Offset
RED
CDS &
PGA
Green
CDS &
PGA
BLUE
CDS &
PGA
XRD9836
M
U
X
16-BIT
30MHz
ADC
16
OFFSET/GAIN
INPUT
10
GREEN GAIN
Green Gain
REGISTER
10
10
GREEN OFFSET
REGISTER
Green Offset
BLUE GAIN
REGISTER
BLUE OFFSET
REGISTER
Blue Gain
10
10
Blue Offset
D
E
M
U
X
GREEN HIGH ORDER
ADC OUT
GREEN LOW ORDER
ADC OUT
BLUE HIGH ORDER
ADC OUT
BLUE LOW ORDER
ADC OUT
8
ADC
OUT
ADCLK
SERIAL PORT
SCLK
SDATA
LOAD
TIMING
VSAMP
BSAMP
LCLMP
3
3
POWER
2
2
Ognd
Avdd
Agnd
Ovdd
Dvdd Dgnd
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
XRD9836
xr
16-BIT PIXEL GAIN AFE
REV. 1.0.0
F
IGURE
2. P
IN
O
UT OF THE
D
EVICE
ADCLK
VSAMP
BSAMP
LCLMP
IE
SCLK
SDIO
LOAD
Ovdd
Ognd
Avdd
RED -
RED+
GRN -
GRN+
BLU -
BLU+
Agnd
Rext
Agnd
Avdd
CMREF
CAPP
CAPN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Dgnd
Dvdd
OGI [0]
OGI [1]
OGI [2]
OGI [3]
OGI [4]
OGI [5]
OGI [6]
OGI [7]
OGI [8]
OGI [9]
ADCO [0]
ADCO [1]
ADCO [2]
ADCO [3]
Ognd
Ovdd
ADCO [4]
ADCO [5]
ADCO [6]
ADCO [7]
Agnd
Avdd
TSSOP
ORDERING INFORMATION
P
ART
N
UMBER
XRD9836ACG
P
ACKAGE
48 - TSSOP
O
PERATING
T
EMPERATURE
R
ANGE
0
°
C to +70
°
C
2
xr
XRD9836
16-BIT PIXEL GAIN AFE
REV. 1.0.0
PIN DESCRIPTIONS
P
IN
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
S
YMBOL
ADCLK
VSAMP
BSAMP
LCLMP
IE
SCLK
SDIO
LOAD
Ovdd
Ognd
Avdd
RED-
RED+
GRN-
GRN+
BLU-
BLU+
Agnd
REXT
Agnd
Avdd
CMREF
CAPP
CAPN
Avdd
Agnd
ADCO[7]
ADCO[6]
ADCO[5]
ADCO[4]
Ovdd
Ognd
ADCO[3]
ADCO[2]
ADCO[1]
ADCO[0]
OGI[9]
OGI[8]
OGI[7]
OGI[6]
OGI[5]
OGI[4]
OGI[3]
OGI[2]
OGI[1]
OGI[0]
Dvdd
Dgnd
T
YPE
clock
clock
clock
clock
digital
clock
digital in/out
digital in
power
ground
power
analog
analog
analog
analog
analog
analog
ground
analog
ground
power
analog
analog
analog
power
ground
output
output
output
output
power
ground
output
output
output
output
digital in
digital in
digital in
digital in
digital in
digital in
digital in
digital in
digital in
digital in
power
ground
D
ESCRIPTION
ADC clock - 50Kohm internal pull-down resistor
Video Sample clock - 50Kohm internal pull-down resistor
Black Sample clock - 50Kohm internal pull-down resistor
Line Clamp clock
Input Enable - 50Kohm internal pull-down resistor
Serial Port serial clock - 50Kohm internal pull-down resistor
Serial Port Data I/O - 50Kohm internal pull-down resistor
Serial Port Load - 50Kohm pull-down resistor
Output driver VDD
Output driver Ground
ANALOG VDD
RED ANALOG INPUT NEGATIVE
RED ANALOG INPUT POSITIVE
GREEN ANALOG INPUT NEGATIVE
GREEN ANALOG INPUT POSITIVE
BLUE ANALOG INPUT NEGATIVE
BLUE ANALOG INPUT POSITIVE
ANALOG GROUND
External Bias Resistor -external 10Kohm resistor to ground
ANALOG GROUND
ANALOG VDD
Common Mode Reference for ADC
ADC Reference By-Pass
ADC Reference By-Pass
ANALOG VDD
ANALOG GROUND
ADC parallel out 7
ADC parallel out 6
ADC parallel out 5
ADC parallel out 4
Output driver VDD
Output driver Ground
ADC parallel out 3
ADC parallel out 2
ADC parallel out 2
ADC parallel out 1
(LSB)
(MSB)
OFFSET AND GAIN PARALLEL IN 9 (MSB)
OFFSET AND GAIN PARALLEL IN 8
OFFSET AND GAIN PARALLEL IN 7
OFFSET AND GAIN PARALLEL IN 6
OFFSET AND GAIN PARALLEL IN 5
OFFSET AND GAIN PARALLEL IN 4
OFFSET AND GAIN PARALLEL IN 3
OFFSET AND GAIN PARALLEL IN 2
OFFSET AND GAIN PARALLEL IN 1
OFFSET AND GAIN PARALLEL IN 0 (LSB)
Digital VDD
Digital Ground
3
XRD9836
xr
16-BIT PIXEL GAIN AFE
REV. 1.0.0
ELECTRICAL CHARACTERISTICS - XRD9836
Unless otherwise specified: AVDD=DVDD=3.3V, ADCLK = 30 MHz, R
EXT
=10KΩ, Ta=25C
Ω
P
ARAMETER
S
YMBOL
M
IN
.
T
YP
.
A/D CONVERTER
M
AX
.
U
NIT
C
ONDITIONS
Resolution
Conversion Rate
R
Fc3
Fc1
16
1.0
1.0
-0.024
0.002
40
15
+/-2
0.003
2
10
15
0.024
BITS
MSPS
MSPS
% FS
mV
uV/C
%FS
%FS/C
Vpp
PER CHANNEL
in 3-CH Mode
PER CHANNEL
in 1-CH Mode
Differential Non-
Linearity
Input Referred
Offset
Offset Drift
Input Referred
Gain Error
Gain Error Drift
Input Voltage
Range
DNL
ZSE
ZSD
FSE
FSD
IVR
P
ARAMETER
S
YMBOL
M
IN
.
T
YP
.
M
AX
.
U
NIT
C
ONDITIONS
V
OLTAGE
R
EFERENCES
Vref+
Vref-
Vref
Common Mode
Delta Vref
Vref(+) - Vref(-)
CAPP
CAPN
VCMR
∆VREF
1.475
0.425
0.970
0.85
1.7
0.7
1.15
1.00
1.925
0.875
1.430
1.15
V
V
V
V
4
xr
XRD9836
16-BIT PIXEL GAIN AFE
REV. 1.0.0
ELECTRICAL CHARACTERISTICS - XRD9836 (con’t)
Unless otherwise specified: AVDD=DVDD=3.3V, ADCLK = 30 MHz, R
EXT
=10KΩ, Ta=25C
Ω
P
ARAMETER
S
YMBOL
M
IN
.
T
YP
.
CDS - S/H
M
AX
.
U
NIT
C
ONDITIONS
Input Voltage
Range
1.0
INVSR
0.5
1.2
V
V
V
nA
CCD Mode,
Gain = 1 to 10
CCD Mode,
Gain = 2 to 20
CIS Mode,
Gain = 0.5 to 5
Input Leakage
Current
Input Switch On
Resistance
Iin
-40
8
40
Ron
50
150
Ω
At input pins: RED+/-,
GRN+/-, BLU+/- when
BSAMP is active
guaranteed by design
At input pins: RED+/-,
GRN+/-, BLU+/- when
BSAMP is inactive
guaranteed by design
CCD MODE
Input Switch
Off Resistance
Internal Voltage
Clamp CDS
Input
(inverting)
Internal Voltage
Clamp S/H Input
(Non-inverting)
Roff
100
MEGΩ
Vclampccd
1.1
1.25
1.4
V
Vclampsh
-0.2
0.0
0.2
V
CIS MODE
P
ARAMETER
S
YMBOL
M
IN
T
YP
M
AX
U
NIT
C
ONDITIONS
OFFSET SPECIFICATIONS
Fine Offset
Range
Fine Offset
Step
Dynamic
Offset Range
Dynamic
Offset Step
FOFR-
FOFR+
FOFRES
DOFR-
DOFR+
DOFRES
-125
120
-200
80
-128
+127
0.25
-80
+160
0.25
-55
250
-80
200
mV
mV
mV
mV
mV
mV
10bit
10bit
5
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