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AD9842A PDF даташит

Спецификация AD9842A изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «Complete 20 MSPS CCD Signal Processors».

Детали детали

Номер произв AD9842A
Описание Complete 20 MSPS CCD Signal Processors
Производители Analog Devices
логотип Analog Devices логотип 

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AD9842A Даташит, Описание, Даташиты
a
FEATURES
20 MSPS Correlated Double Sampler (CDS)
4 dB ؎ 6 dB 6-Bit Pixel Gain Amplifier (PxGA®)
2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
Low Noise Clamp Circuits
Analog Preblanking Function
10-Bit (9841) or 12-Bit (9842) 20 MSPS A/D Converter
Auxiliary Inputs with VGA and Input Clamp
3-Wire Serial Digital Interface
3 V Single Supply Operation
Low Power: 65 mW @ 2.7 V Supply
48-Lead LQFP Package
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
Complete 20 MSPS
CCD Signal Processors
AD9841A/AD9842A
PRODUCT DESCRIPTION
The AD9841A and AD9842A are complete analog signal proces-
sors for CCD applications. Both products feature a 20 MHz
single-channel architecture designed to sample and condition
the outputs of interlaced and progressive scan area CCD arrays.
The AD9841A/AD9842A’s signal chain consists of an input
clamp, correlated double sampler (CDS), Pixel Gain Amplifier
(PxGA), digitally controlled variable gain amplifier (VGA),
black level clamp, and A/D converter. The AD9841A offers 10-bit
ADC resolution, while the AD9842A contains a true 12-bit
ADC. Additional input modes are provided for processing analog
video signals.
The internal registers are programmed through a 3-wire serial
digital interface. Programmable features include gain adjustment,
black level adjustment, input configuration, and power-down modes.
The AD9841A and AD9842A operate from a single 3 V power
supply, typically dissipate 78 mW, and are packaged in a 48-
lead LQFP.
CCDIN
CLPDM
AUX1IN
AUX2IN
FUNCTIONAL BLOCK DIAGRAM
PBLK
AVDD
AVSS
HD
VD
CLPOB
4dB ؎ 6dB
CDS
PxGA
CLP
6
2:1
MUX
BUF
CLP
AD9841A/AD9842A
COLOR
STEERING
2:1
MUX
2dB–36dB
VGA
CLP
ADC
10/12
DRVDD
DRVSS
DOUT
OFFSET
10 DAC
CONTROL
REGISTERS
DIGITAL
INTERFACE
8
BANDGAP
REFERENCE
INTERNAL
BIAS
INTERNAL
TIMING
VRT
VRB
CML
DVDD
DVSS
SL SCK SDATA
SHP SHD DATACLK
PxGA is a registered trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001









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AD9842A Даташит, Описание, Даташиты
AD9841A/AD9842A–SPECIFICATIONS
GENERAL SPECIFICATIONS (TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = 20 MHz, unless otherwise noted.)
Parameter
Min Typ
Max
Unit
TEMPERATURE RANGE
Operating
Storage
–20 +85 °C
–65
+150
°C
POWER SUPPLY VOLTAGE
Analog, Digital, Digital Driver
2.7
3.6 V
POWER CONSUMPTION
Normal Operation
Power-Down Modes
Fast Recovery Mode
Standby
Total Power-Down
(Specified Under Each Mode of Operation)
30
5
1
mW
mW
mW
MAXIMUM CLOCK RATE
20
MHz
A/D CONVERTER (AD9841A)
Resolution
Differential Nonlinearity (DNL)
No Missing Codes
Full-Scale Input Voltage
Data Output Coding
10
± 0.4
10
2.0
Straight Binary
± 1.0
Bits
LSB
Bits Guaranteed
V
A/D CONVERTER (AD9842A)
Resolution
Differential Nonlinearity (DNL)
No Missing Codes
Full-Scale Input Voltage
Data Output Coding
12
± 0.5
12
2.0
Straight Binary
± 1.0
Bits
LSB
Bits Guaranteed
V
VOLTAGE REFERENCE
Reference Top Voltage (VRT)
Reference Bottom Voltage (VRB)
2.0 V
1.0 V
Specifications subject to change without notice.
DIGITAL SPECIFICATIONS (DRVDD = 2.7 V, CL = 20 pF unless otherwise noted.)
Parameter
Symbol
Min
Typ
LOGIC INPUTS
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
Input Capacitance
LOGIC OUTPUTS
High Level Output Voltage, IOH = 2 mA
Low Level Output Voltage, IOL = 2 mA
Specifications subject to change without notice.
VIH
VIL
IIH
IIL
CIN
VOH
VOL
2.1
10
10
10
2.2
Max
0.6
0.5
Unit
V
V
µA
µA
pF
V
V
–2– REV. 0









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AD9842A Даташит, Описание, Даташиты
AD9841A/AD9842A
AD9841A CCD-MODE SPECIFICATIONS (TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 20 MHz, unless other-
wise noted.)
Parameter
Min Typ Max
Unit
Notes
POWER CONSUMPTION
78 mW See TPC 1 for Power Curves
MAXIMUM CLOCK RATE
20
MHz
CDS
Gain
Allowable CCD Reset Transient1
Max Input Range Before Saturation1
Max CCD Black Pixel Amplitude1
0
500
1.0
200
dB
mV
V p-p
mV
See Input Waveform in Footnote 1
PxGA Gain at 4 dB
PIXEL GAIN AMPLIFIER (PxGA)
Max Input Range
Max Output Range
Gain Control Resolution
Gain Monotonicity
Gain Range (Two’s Complement Coding)
Min Gain (PxGA Gain Code 32)
Max Gain (PxGA Gain Code 31)
1.0
1.6
64
Guaranteed
–2
10
V p-p
V p-p
Steps
dB
dB
PxGA Gain at 4 dB
At Any PxGA Gain
See Figure 28 for PxGA Gain Curve
VARIABLE GAIN AMPLIFIER (VGA)
Max Input Range
Max Output Range
Gain Control Resolution
Gain Monotonicity
Gain Range
Low Gain (VGA Gain Code 91)
Max Gain (VGA Gain Code 1023)
1.6
2.0
1024
. Guaranteed
2
36
V p-p
V p-p
Steps
dB
dB
See Figure 29 for VGA Gain Curve
BLACK LEVEL CLAMP
Clamp Level Resolution
Clamp Level
Min Clamp Level
Max Clamp Level
256
0
63.75
Steps
LSB
LSB
Measured at ADC Output
SYSTEM PERFORMANCE
Gain Accuracy, VGA Code 91 to 10232
–0.5
PxGA Gain Accuracy
Min Gain (PxGA Register Code 32) –1 0
Max Gain (PxGA Code 31)
11 12
Peak Nonlinearity, 500 mV Input Signal
0.1
Peak Nonlinearity, 800 mV Input Signal
0.4
Total Output Noise
0.2
Power Supply Rejection (PSR)
40
+0.5
+1
13
Specifications Include Entire Signal Chain
Use Equations on Page 19 to Calculate Gain
dB
dB
%
%
LSB rms
dB
VGA Gain Fixed at 2 dB (Code 91)
VGA Gain Fixed at 2 dB (Code 91)
12 dB Gain Applied
8 dB Gain Applied
AC Grounded Input, 6 dB Gain Applied
Measured with Step Change on Supply
POWER-UP RECOVERY TIME
Fast Recovery Mode
Reference Standby Mode
Total Shutdown Mode
Power-Off Condition
Normal Clock Signals Applied
0.1 ms
1 ms
3 ms
15 ms
NOTES
1Input Signal Characteristics defined as follows:
500mV TYP
RESET TRANSIENT
200mV MAX
OPTICAL BLACK PIXEL
1V MAX
INPUT SIGNAL RANGE
2PxGA gain fixed at 4 dB.
Specifications subject to change without notice.
REV. 0
–3–










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