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PDF XRD9824 Data sheet ( Hoja de datos )

Número de pieza XRD9824
Descripción 14-Bit Linear CIS/CCD Sensor Signal Processor
Fabricantes Exar Corporation 
Logotipo Exar Corporation Logotipo



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XRD9824
14-Bit Linear CIS/CCD Sensor
Signal Processor with Serial Control
FEATURES
· 14-Bit Resolution, No Missing Codes
· One-channel 6MSPS Pixel Rate
· Triple-channel 2MSPS Pixel Rate
· 6-Bit Programmable Gain Amplifier
· 8-Bit Programmable Offset Adjustment
· CIS or CCD Compatibility
· Internal Clamp for CIS or CCD AC Coupled
Configurations
· 5V Operation
· Serial Load Control Registers
· Low Power CMOS: 200mW-typ
· Low Cost 20-Lead Packages
· USB Compliant
May 2000-3
APPLICATIONS
· Color and Grayscale Flatbed Scanners
· Color and Grayscale Sheetfed Scanners
· Multifunction Peripherals
· Digital Color Copiers
· General Purpose CIS or CCD Imaging
· Low Cost Data Acquisition
· Simple and Direct Interface to Canon 600 DPI
Sensors
GENERAL DESCRIPTION
The XRD9824 is a complete linear CIS or CCD sensor
signal processor on a single monolithic chip. The
XRD9824 includes a high speed 14-bit resolution
ADC, a 6-bit Programmable Gain Amplifier with gain
adjustment of 1 to 10, and 8-bit programmable input
referred offset calibration range of 800mV.
In the CCD configuration the input signal is AC
coupled with an external capacitor. An internal clamp
sets the black level. In the CIS configuration, the
clamp switch can be disabled and the CIS output
signal is DC coupled from the CIS sensor to the
XRD9824. The CIS signal is level shifted to VRB in
order to use the full range of the ADC. In the CIS
configuration the input can also be AC coupled similar
to the CCD configuration. This enables CIS signals
with large black levels to be internally clamped to a DC
reference equal to the black level. The DC reference
is internally subtracted from the input signal.
The CIS configuration can also be used in other
applications that do not require CDS function, such as
low cost data acquisition.
ORDERING INFORMATION
Package Type
20-Lead SOIC
20-Lead SSOP
Temperature Range
0°C to +70°C
0°C to +70°C
Part Number
XRD9824ACD
XRD9824ACU
Rev. 2.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

1 page




XRD9824 pdf
XRD9824
ELECTRICAL CHARACTERISTICS (CONT'D)
Test Conditions: AVDD=DVDD=5V, ADCCLK=6MHz, 50% Duty Cycle, TA=25°C unless otherwise specified.
Symbol
Parameter
Buffer Specifications
IIL
CIN
VINPP
Input Leakage Current
Input Capacitance
AC Input Voltage Range
AC Input Voltage Range
VIN DC Input Voltage Range
DC Input Voltage Range
Min.
Typ.
Max. Unit Conditions
10
0
0
-0.1
VDCEXT-0.1
100
AVDD-1.4
nA
pF
V
DVREF
V
AVDD-1.4 V
VDCEXT+
DV
REF
V
CIS AC; INT VDCREF
Config Reg
=> XXX010XX
Gain=1 (Note 1)
CCD AC; INT VDCREF
Config Reg
=> XXX011XX
Gain=1 (Note 1)
CIS DC; INT VDCREF
Config Reg
=> XXX000XX
Gain=1 (Note 2)
CIS DC; EXT VDCREF
Config Reg
=> XXX100XX
Gain=1 (Note 3)
VDCEXT+DVREF < AVDD
VDCEXT
External DC Reference
Pin 16=Input
VDCEXT
Internal DC Reference
Pin 16=Output
VIN
BW
VINCT
Input Bandwidth (Small Signal)
Channel to Channel Crosstalk
Internal Clamp Specifications
VCLAMP
Clamp Voltage
RINT Clamp Switch On Resistance
R Clamp Switch Off Resistance
OFF
0.3
1.17
AVDD/2 V CIS DC; EXT VDCREF
Config Reg Mode 110
=> XXX100XX
1.34 V Internal CIS Reference
Circuit
Config Reg Mode 111
=> XXX1XXXX
10 MHz
-60 -50 dB fin=3MHz
AGND
50
mV CIS (AC) Config
3.5 VRT
V CCD (AC) Config
100 150
10 M
Note 1: VIN is the signal swing before the external capacitor tied to the MUX inputs.
PP
Note 2: The -0.1V minimum is specified in order to accommodate black level signals lower than the external DC
reference (clamp) voltage.
Note 3: The VDCEXT-0.1V minimum is specified in order to accommodate black level signals lowerthan the external DC
reference voltage.
Rev. 2.00
5

5 Page





XRD9824 arduino
XRD9824
VCC (5V - 15V)
AVDD
C
I
S
N/C
N/C
0.1uF
19
RED
18
GRN
17
BLU
DB7/LD
DB6/SDATA
DB5/SCLK
DB4
DB3
DB2
DB1
DB0
16
VDCEXT
ADCCLK
15
VREF+
CLAMP
SYNCH
9
8
7
6
5
4
3
2
11
12
13
AVDD
DVDD (3V - 5V)
20
AVDD
DVDD
1
14
AGND
10
DGND
AGND
XRD9824
DIGITAL
ASIC
DGND
Figure 5. Typical Application Circuitry CIS DC Coupled Non-Inverted Mode
Rev. 2.00
11

11 Page







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