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AD9821 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD9821은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 AD9821 자료 제공

부품번호 AD9821 기능
기능 Complete 12-Bit 40 MSPS Imaging Signal Processor
제조업체 Analog Devices
로고 Analog Devices 로고


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AD9821 데이터시트, 핀배열, 회로
FEATURES
Differential Sensor Input with 1 V p-p Input Range
0 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
Low Noise Optical Black Clamp Circuit
Analog Preblanking Function
12-Bit 40 MSPS A/D Converter (ADC)
3-Wire Serial Digital Interface
3 V Single-Supply Operation
Low Power: 150 mW @ 3 V Supply
48-Lead LQFP Package
APPLICATIONS
Digital Still Cameras Using CMOS Imagers
Industrial/Scientific Imaging
Complete 12-Bit 40 MSPS
Imaging Signal Processor
AD9821
GENERAL DESCRIPTION
The AD9821 is a complete analog signal processor for imaging
applications that do not require Correlated Double Sampling
(CDS). It features a 40 MHz single-channel architecture designed
to sample and condition the outputs of CMOS imagers and CCD
arrays already containing on-chip CDS. The AD9821’s signal
chain consists of a differential input sample-and-hold amplifier
(SHA), digitally controlled variable gain amplifier (VGA), black
level clamp, and a 12-bit ADC.
The internal registers are programmed through a 3-wire serial
digital interface. Programmable features include gain adjust-
ment, black level adjustment, and power-down modes.
The AD9821 operates from a single 3 V power supply, typically
dissipates 150 mW, and is packaged in a 48-lead LQFP.
VIN+
VIN–
BYP1
FUNCTIONAL BLOCK DIAGRAM
AVDD AVSS
VRT VRB
AD9821
+
SHA
0dB ~ 36dB
VGA
BAND GAP
REFERENCE
12-BIT
ADC
PBLK
12
DRVDD
DRVSS
DOUT
10 CLP
INTERNAL
REGISTERS
DIGITAL
INTERFACE
8 BLK CLAMP
LEVEL
CLPOB
DVDD
DVSS
SL SCK SDATA
DATACLK
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 that
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
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002




AD9821 pdf, 반도체, 판매, 대치품
AD9821
TIMING SPECIFICATIONS (CL = 20 pF, fSAMP = 40 MHz, Imager-Mode Timing in Figures 5 and 6, Serial Timing in Figures 7–9)
Parameter
Symbol
Min
Typ Max
Unit
SAMPLE CLOCKS
DATACLK Clock Period
DATACLK Hi/Low Pulsewidth
CLPOB Pulsewidth*
Internal Clock Delay
DATA OUTPUTS
Output Delay
Output Hold Time
Pipeline Delay
tCONV
tADC
tCOB
tID
tOD
tH
25
11
2
7.0
25
12.5
20
3.0
13 16
7.6
9
ns
ns
Pixels
ns
ns
ns
Cycles
SERIAL INTERFACE
Maximum SCK Frequency
SL to SCK Setup Time
SCK to SL Hold Time
SDATA Valid to SCK Rising Edge Setup
SCK Falling Edge to SDATA Valid Hold
SCK Falling Edge to SDATA Valid Read
fSCLK
tLS
tLH
tDS
tDH
tDV
10
10
10
10
10
10
*Minimum CLPOB pulsewidth is for functional operation only. Wider typical pulses are recommended to achieve low noise clamp performance.
Specifications subject to change without notice.
MHz
ns
ns
ns
ns
ns
ABSOLUTE MAXIMUM RATINGS
Parameter
With
Respect
To Min Max
AVDD1, AVDD2 AVSS
DVDD1, DVDD2 DVSS
DRVDD
DRVSS
Digital Outputs
DRVSS
DATACLK
DVSS
CLPOB, PBLK
DVSS
SCK, SL, SDATA DVSS
VRT, VRB
AVSS
BYP1, VIN
AVSS
Junction Temperature
Lead Temperature
(10 sec)
–0.3 +3.9
–0.3 +3.9
–0.3 +3.9
–0.3 DRVDD + 0.3
–0.3 DVDD + 0.3
–0.3 DVDD + 0.3
–0.3 DVDD + 0.3
–0.3 AVDD + 0.3
–0.3 AVDD + 0.3
150
300
Unit
V
V
V
V
V
V
V
V
V
°C
°C
Model
AD9821KST
ORDERING GUIDE
Temperature
Range
Package
Description
–20°C to +85°C Thin Plastic
Quad Flatpack
(LQFP)
Package
Option
ST-48
THERMAL CHARACTERISTICS
Thermal Resistance
48-Lead LQFP Package
θJA = 56°C/W
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD9821 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
–4– REV. 0

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AD9821 전자부품, 판매, 대치품
160
150
140
VDD = 3.0V
130
120
110
100
20
30
SAMPLE RATE – MHz
TPC 1. Power vs. Sample Rate
1.0
Typical Performance Characteristics–AD9821
15.0
13.5
12.0
10.5
9.0
7.5
6.0
4.5
3.0
1.5
0
40 0 255 511 767 1023
VGA GAIN CODE – LSB
TPC 3. Output Noise vs. VGA Gain
0.5
0
–0.5
–1.0
0
500 1000 1500 2000 2500 3000 35000 4000
TPC 2. Typical DNL Performance
REV. 0
–7–

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