AD9941BSTZRL Datasheet AD9941BSTZRL, AD9941BSTZ | P1-P3

Complete 14-Bit, 56 MSPS

Imaging Signal Processor

AD9941

Rev. 0

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FEATURES

Differential sensor input with 1 V p-p input range

0 dB/6 dB variable gain amplifier (VGA)

Low noise optical black clamp circuit

14-bit, 56 MSPS analog-to-digital converter (ADC)

No missing codes guaranteed

3-wire serial digital interface

3 V single-supply operation

Low power CMOS: 145 mW @ 3.0 V, 56 MHz

48-lead LQFP package

APPLICATIONS

Digital still cameras using CMOS imagers

Professional HDTV camcorders

Professional/high-end digital cameras

Broadcast cameras

GENERAL DESCRIPTION

The AD9941 is a complete analog signal processor for imaging

applications that do not require correlated double sampling

(CDS). It is also suitable for processing the output signal from

the AD9940 CDS front end product. It features a 56 MHz, single-

channel architecture designed to sample and condition the output

of CMOS imagers and CCD arrays already containing on-chip

CDS. The AD9941 signal chain consists of a differential input

sample-and-hold amplifier (SHA), a digitally controlled variable

gain amplifier (VGA), a black level clamp, and a 14-bit ADC.

The internal registers are programmed through a 3-wire serial

digital interface.

The AD9941 operates from a single 3 V supply, typically

dissipates 145 mW, and is packaged in a 48-lead LQFP.

FUNCTIONAL BLOCK DIAGRAM

ADCLK

BAND GAP

REFERENCE

DOUT

PBLK

REFT

REFB

0dB, 6dB

IN+

DVDD

DVSS

VIN–

DRVDD

DRVSS

DIGITAL

INTERFACE

SDATASCKSL

CLPOB

VGA

CLP

AD9941

INTERNAL

REGISTERS

BLK CLAMP

LEVEL

14-BIT

ADC

AVDD

AVSS

05504-001

SHA

Figure 1.

AD9941

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

Specifications .....................................................................................3

Digital Specifications....................................................................3

Analog Specifications ...................................................................4

Timing Specifications ...................................................................5

Timing Diagrams ..........................................................................5

Absolute Maximum Ratings ............................................................6

Thermal Characteristics ...............................................................6

ESD Caution ..................................................................................6

Pin Configuration and Function Descriptions .............................7

Termi nolo g y .......................................................................................8

Equivalent Input/Output Circuits...................................................9

Serial Interface Timing...................................................................10

Circuit Description and Operation ..............................................12

Differential Input SHA ...............................................................12

Variable Gain Amplifier.............................................................13

ADC..............................................................................................13

Optical Black Clamp...................................................................13

Applications Information...............................................................14

Outline Dimensions........................................................................16

Ordering Guide ...........................................................................16

REVISION HISTORY

7/05—Revision 0: Initial Version

AD9941

Rev. 0 | Page 3 of 16

SPECIFICATIONS

Table 1.

Parameter Min Typ Max Unit

TEMPERATURE RANGE

Operating −25 +85 °C

Storage −65 +150 °C

POWER SUPPLY VOLTAGE

AVDD, DVDD, DRVDD 2.9 3.0 3.6 V

POWER DISSIPATION

Normal Operation—56 MHz, AVDD = DVDD = DRVDD = 3.0 V 145 mW

Standby Mode 2 mW

MAXIMUM CLOCK RATE 56 MHz

DIGITAL SPECIFICATIONS

DRVDD = 2.9 V, C

= 20 pF, unless otherwise noted.

Table 2.

Parameter Symbol Min Typ Max Unit

LOGIC INPUTS

High Level Input Voltage V

2.1 V

Low Level Input Voltage V

0.6 V

High Level Input Current I

10 μA

Low Level Input Current I

10 μA

Input Capacitance C

10 pF

LOGIC OUTPUTS

High Level Output Voltage , I

= 2 mA V

2.2 V

Low Level Output Voltage , I

= 2 mA V

0.5 V

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P16

AD9941BSTZRL

Mfr. #:

Buy AD9941BSTZRL

Manufacturer:

Analog Devices Inc.

Description:

Analog Front End - AFE 14B 56 MSPS Imaging Signal Processor

Lifecycle:

New from this manufacturer.

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AD9941BSTZRL

AD9941BSTZRL

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