Analog Devices AD9843A Manual de usuario

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no res onsibility is assumed by Analog Devices for its

use, nor for any infringements of atents or other rights of third arties

which may result from its use. No license is granted by im lication or

otherwise under any atent or atent rights of Analog Devices.

AD9843A

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U. .A.

Tel: 781/329-4700 World Wide Web ite: http://www.analog.com

Fax: 781/326-8703 © Analog Devices, Inc., 2000

Complete 10-Bit 20 MSPS

CCD Signal Processor

FUNCTIONAL BLOCK DIAGRAM

DATACLKSHDSHP

BANDGAP

REFERENCE

2:1

MUX DOUT

AUX2IN

CLPDM

CCDIN

OFFSET

DAC

PBLK

AUX1IN

VRT

VRB

INTERNAL

TIMING

INTERNAL

BIAS

2dB~36dB

AVDD

DVDD

DVSS

AVSS

DRVDD

DRVSS

CML

DIGITAL

INTERFACE

SDATASCK

CLPOB

CDS

VGA

CLP

BUF

2:1

MUX

CLP

AD9843A

4dB6dB

INTERNAL

REGISTERS

CLP

10-BIT

ADC

FEATURE

20 M P Correlated Double ampler (CD )

4 dB  6 dB Variable CD Gain with 6-Bit Resolution

2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)

Low Noise Clamp Circuits

Analog Preblanking Function

10-Bit 20 M P A/D Converter

Auxiliary Inputs with VGA and Input Clamp

3-Wire erial Digital Interface

3 V ingle upply Operation

Low Power: 65 mW @ 2.7 V upply

48-Lead LQFP Package

APPLICATION

Digital till Cameras

Digital Video Camcorders

PC Cameras

PRODUCT DESCRIPTION

The AD9843A is a complete analog signal processor for CCD

applications. It features a 20 MHz single-channel architecture

designed to sample and condition the outputs of interlaced and

progressive scan area CCD arrays. The AD9843A’s signal chain

consists of an input clamp, correlated double sampler (CDS),

digitally controlled variable gain amplifier (VGA), black level

clamp, and 10-bit A/D converter. 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 adjust-

ment, black level adjustment, input configuration, and power-

down modes.

The AD9843A operates from a single 3 V power supply, typi-

cally dissipates 78 mW, and is packaged in a 48-lead LQFP.

–2– REV. 0

AD9843A–SPECIFICATIONS

GENERAL SPECIFICATIONS

Parameter Min Typ Max Unit

TEMPERATURE RANGE

Operating –20 +85 °C

Storage –65 +150 °C

POWER SUPPLY VOLTAGE

Analog, Digital, Digital Driver 2.7 3.6 V

POWER CONSUMPTION

Normal Operation (Specified Under Each Mode of Operation)

Power-Down Modes

Fast Recovery Mode 45 mW

Standby 5 mW

Total Power-Down 1 mW

MAXIMUM CLOCK RATE 20 MHz

A/D CONVERTER

Resolution 10 Bits

Differential Nonlinearity (DNL) ±0.4 ±1.0 LSB

No Missing Codes 10 Bits Guaranteed

Full-Scale Input Voltage 2.0 V

Data Output Coding Straight Binary

VOLTAGE REFERENCE

Reference Top Voltage (VRT) 2.0 V

Reference Bottom Voltage (VRB) 1.0 V

Specifications subject to change without notice.

DIGITAL SPECIFICATIONS

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

Specifications subject to change without notice.

(TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = 20 MHz, unless otherwise noted.)

(DRVDD = 2.7 V, CL= 20 pF unless otherwise noted.)

–3–

REV. 0

AD9843A

Parameter Min Typ Max Unit Notes

OWER CONSUMPTION 78 mW See TPC 1 for Power Curves

MAXIMUM CLOCK RATE 20 MHz

CDS

Allowable CCD Reset Transient

500 mV See Input Waveform in Note 1

Max CCD Black Pixel Amplitude

200 mV

Max Input Range Before Saturation

1.0 V p-p With 4 dB CDS Gain

Max Input Range Before Saturation 1.5 V p-p With –2 dB CDS Gain

Max Input Range Before Saturation 0.5 V p-p With 10 dB CDS Gain

Max Output Range 1.6 V p-p At Any CDS Gain Setting

Gain Resolution 64 Steps

Gain Range (Two’s Complement Coding) See Figure 12 for CDS Gain Curve

Min Gain (CDS Gain Register Code 32) –2 dB

Medium Gain (CDS Gain Code 63) 4 dB 4 dB Is Default with CDS Gain Disabled

Max Gain (CDS Gain Code 31) 10 dB

VARIABLE GAIN AMPLIFIER (VGA)

Max Input Range 1.6 V p-p

Max Output Range 2.0 V p-p

Gain Control Resolution 1024 Steps

Gain Monotonicity Guaranteed

Gain Range See Figure 13 for VGA

Gain Curve

Low Gain (VGA Register Code 91) 2 dB See Page 13 for Gain Equations

Max Gain (VGA Code 1023) 36 dB

BLACK LEVEL CLAMP

Clamp Level Resolution 256 Steps

Clamp Level Measured at ADC Output

Min Clamp Level 0 LSB

Max Clamp Level 63.75 LSB

SYSTEM PERFORMANCE Specifications Include Entire Signal Chain

Gain Accuracy, VGA Code 91 to 1023 –0.5 +0.5 dB Use Equations on Page 13 to Calculate Gain

Peak Nonlinearity, 500 mV Input Signal 0.1 % 12 dB Gain Applied (4 dB CDS Gain)

Peak Nonlinearity, 800 mV Input Signal 0.4 % 8 dB Gain Applied (4 dB CDS Gain)

Total Output Noise 0.2 LSB rms AC Grounded Input, 6 dB Gain Applied

Power Supply Rejection (PSR) 40 dB Measured with Step Change on Supply

POWER-UP RECOVERY TIME Clocks Must Be Applied, as in Figures 5 and 6

From Fast Recovery Mode 0.1 ms

From Reference Standby Mode 1 ms

From Total Shutdown Mode 3 ms

From Power-Off Condition 15 ms

NOTES

Input Signal Characteristics defined as follows, with 4 dB CDS gain:

1V MAX

INPUT

SIGNAL RANGE

200mV MAX

OPTICAL

BLACK PIXEL

500mV TYP

RESET

TRANSIENT

Specifications subject to change without notice.

CCD-MODE SPECIFICATIONS

(TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 20 MHz, unless otherwise noted.)

–4– REV. 0

AD9843A–SPECIFICATIONS

AUX1-MODE SPECIFICATIONS

Parameter Min Typ Max Unit

POWER CONSUMPTION 60 mW

MAXIMUM CLOCK RATE 20 MHz

INPUT BUFFER

Gain 0dB

Max Input Range 1.0 V p-p

VGA

Max Output Range 2.0 V p-p

Gain Control Resolution 1023 Steps

Gain (Selected Using VGA Gain Register)

Min Gain 0 dB

Max Gain 36 dB

Specifications subject to change without notice.

AUX2-MODE SPECIFICATIONS

Parameter Min Typ Max Unit

POWER CONSUMPTION 60 mW

MAXIMUM CLOCK RATE 20 MHz

INPUT BUFFER (Same as AUX1-MODE)

VGA

Max Output Range 2.0 V p-p

Gain Control Resolution 512 Steps

Gain (Selected Using VGA Gain Register)

Min Gain 0 dB

Max Gain 18 dB

ACTIVE CLAMP

Clamp Level Resolution 256 Steps

Clamp Level (Measured at ADC Output)

Min Clamp Level 0 LSB

Max Clamp Level 63.75 LSB

Specification subject to change without notice.

(TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = 20 MHz, unless otherwise noted.)

AD9843A

–5–

REV. 0

TIMING SPECIFICATIONS

Parameter Symbol Min Typ Max Unit

SAMPLE CLOCKS

DATACLK, SHP, SHD Clock Period t

CONV

48 50 ns

DATACLK High/Low Pulsewidth t

ADC

20 25 ns

SHP Pulsewidth t

SHP

712.5 ns

SHD Pulsewidth t

SHD

712.5 ns

CLPDM Pulsewidth t

CDM

4 10 Pixels

CLPOB Pulsewidth

COB

2 20 Pixels

SHP Rising Edge to SHD Falling Edge t

012.5 ns

SHP Rising Edge to SHD Rising Edge t

20 25 ns

Internal Clock Delay t

3.0 ns

Inhibited Clock Period t

INH

10 ns

DATA OUTPUTS

Output Delay t

14.5 16 ns

Output Hold Time t

7.0 7.6 ns

Pipeline Delay 9 Cycles

SERIAL INTERFACE

Maximum SCK Frequency f

SCLK

10 MHz

SL to SCK Setup Time t

10 ns

SCK to SL Hold Time t

10 ns

SDATA Valid to SCK Rising Edge Setup t

10 ns

SCK Falling Edge to SDATA Valid Hold t

10 ns

SCK Falling Edge to SDATA Valid Read t

10 ns

NOTES

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.

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 AD9843A 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.

(CL= 20 pF, fSAMP = 20 MHz, CCD-Mode Timing in Figures 5 and 6, AUX-Mode Timing in Figure 7.

Serial Timing in Figures 8–10.)

ABSOLUTE MAXIMUM RATINGS

With

Respect

Parameter To Min Max Unit

AVDD1, AVDD2 AVSS –0.3 +3.9 V

DVDD1, DVDD2 DVSS –0.3 +3.9 V

DRVDD DRVSS –0.3 +3.9 V

Digital Outputs DRVSS –0.3 DRVDD + 0.3 V

SHP, SHD, DATACLK DVSS –0.3 DVDD + 0.3 V

CLPOB, CLPDM, PBLK DVSS –0.3 DVDD + 0.3 V

SCK, SL, SDATA DVSS –0.3 DVDD + 0.3 V

VRT, VRB, CMLEVEL AVSS –0.3 AVDD + 0.3 V

BYP1-4, CCDIN AVSS –0.3 AVDD + 0.3 V

Junction Temperature 150 °C

Lead Temperature 300 °C

(10 sec)

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

AD9843AJST –20°C to +85°C Thin Plastic ST-48

Quad Flatpack

(LQFP)

THERMAL CHARACTERISTICS

Thermal Resistance

48-Lead LQFP Package

= 92°C

WARNING!

ESD SENSITIVE DEVICE

AD9843A

–6– REV. 0

PIN CONFIGURATION

13 14 15 16 17 18 19 20 21 22 23 24

48 47 46 45 44 39 38 3743 42 41 40

PIN 1

IDENTIFIER

TOP VIEW

(Not to Scale)

AUX1IN

AVSS

AUX2IN

AVDD2

BYP4

CCDIN

(LSB) D0

NC = NO CONNECT

BYP2

BYP1

AVDD1

AVSS

AD9843A

(MSB) D9 AVSS

SCK

SDATA

STBY

THREE-STATE

DVSS

DVDD2

VRB

VRT

CML

DRVDD

DRVSS

DVSS

DATACLK

DVDD1

DVSS

PBLK

CLPOB

SHP

SHD

CLPDM

DVSS

DRVSS

PIN FUNCTION DESCRIPTIONS

Pin Number Name Type Description

1, 2 DRVSS P Digital Driver Ground

3–12 D0–D9 DO Digital Data Outputs

13 DRVDD P Digital Output Driver Supply

14 DRVSS P Digital Output Driver Ground

15, 18, 24, 41 DVSS P Digital Ground

16 DATACLK DI Digital Data Output Latch Clock

17 DVDD1 P Digital Supply

19 PBLK DI Preblanking Clock Input

20 CLPOB DI Black Level Clamp Clock Input

21 SHP DI CDS Sampling Clock for CCD’s Reference Level

22 SHD DI CDS Sampling Clock for CCD’s Data Level

23 CLPDM DI Input Clamp Clock Input

25, 26, 35 AVSS P Analog Ground

27 AVDD1 P Analog Supply

28 BYP1 AO Internal Bias Level. Decoupling

29 BYP2 AO Internal Bias Level Decoupling

30 CCDIN AI Analog Input for CCD Signal

31 NC NC Leave Floating or Decouple to Ground with 0.1 ␮F

32 BYP4 AO Internal Bias Level Decoupling

33 AVDD2 P Analog Supply

34 AUX2IN AI Analog Input

36 AUX1IN AI Analog Input

37 CML AO Internal Bias Level Decoupling

38 VRT AO A/D Converter Top Reference Voltage Decoupling

39 VRB AO A/D Converter Bottom Reference Voltage Decoupling

40 DVDD2 P Digital Supply

42 THREE-STATE DI Digital Output Disable. Active High

43 NC NC May be tied High or Low. Should not be left floating.

44 STBY DI Standby Mode, Active High. Same as Serial Interface Standby Mode

45 NC NC Internally Not Connected. May be Tied High or Low

46 SL DI Serial Digital Interface Load Pulse

47 SDATA DI Serial Digital Interface Data

48 SCK DI Serial Digital Interface Clock

TYPE: AI = Analog Input, AO = Analog Output, DI = Digital Input, DO = Digital Output, P = Power.

AD9843A

–7–

REV. 0

DEFINITIONS OF SPECIFICATIONS

DIFFERENTIAL NONLINEARITY (DNL)

An ideal ADC exhibits code transitions that are exactly 1 LSB

apart. DNL is the deviation from this ideal value. Thus every code

must have a finite width. No missing codes guaranteed to 10-bit

resolution indicates that all 1024 codes, respectively, must be

present over all operating conditions.

PEAK NONLINEARITY

Peak nonlinearity, a full signal chain specification, refers to

the peak deviation of the output of the AD9843A from a true

straight line. The point used as “zero scale” occurs 1/2 LSB

before the first code transition. “Positive full scale” is defined

as a Level 1, 1/2 LSB beyond the last code transition. The devia-

tion is measured from the middle of each particular output

code to the true straight line. The error is then expressed as a

percentage of the 2 V ADC full-scale signal. The input signal is

always appropriately gained up to fill the ADC’s full-scale range.

TOTAL OUTPUT NOISE

The rms output noise is measured using histogram techniques.

The standard deviation of the ADC output codes is calculated

in LSB, and represents the rms noise level of the total signal

chain at the specified gain setting. The output noise can be

converted to an equivalent voltage, using the relationship 1 LSB

= (ADC Full Scale/2

codes) when N is the bit resolution of the

ADC. For the AD9843A, 1 LSB is 2 mV.

POWER SUPPLY REJECTION (PSR)

The PSR is measured with a step change applied to the supply

pins. This represents a very high-frequency disturbance on the

AD9843A’s power supply. The PSR specification is calculated

from the change in the data outputs for a given step change in

the supply voltage.

INTERNAL DELAY FOR SHP/SHD

The internal delay (also called aperture delay) is the time delay

that occurs from when a sampling edge is applied to the AD9843A

until the actual sample of the input signal is held. Both SHP and

SHD sample the input signal during the transition from low to

high, so the internal delay is measured from each clock’s rising

edge to the instant the actual internal sample is taken.

EQUIVALENT INPUT CIRCUITS

330

DVDD

DVSS

Figure 1. Digital In uts—SHP, SHD, DATACLK, CLPOB,

CLPDM, HD, VD, PBLK, SCK, SL

DVDD

DVSS DRVSS

DRVDD

THREE-

STATE

DATA

DOUT

Figure 2. Data Out uts

ACVDD

ACVSS ACVSS

Figure 3. CCDIN (Pin 30)

330

DVDD

DVSS

DATA IN

RNW

DATA OUT

DVSS

Figure 4. SDATA (Pin 47)

AD9843A

–8– REV. 0

SAMPLE RATE – MHz

100

52010

POWER DISSIPATION – mW

= 3.3V

= 3.0V

= 2.7V

TPC 1. Power vs. Sam le Rate

01000

400200 600 800

–0.5

0.5

0.25

–0.25

TPC 2. Ty ical DNL Performance

–Typical Performance Characteristics

VGA GAIN CODE –LSB

01000

400

OUTPUT NOISE –LSB

200

600

800

TPC 3. Out ut Noise vs. VGA Gain

AD9843A

–9–

REV. 0

CCD-MODE AND AUX-MODE TIMING

N–10 N–9N–8N–1N

N N+1 N+2 N+9 N+10

INH

NOTES:

1. RECOMMENDED PLACEMENT FOR DATACLK RISING EDGE IS BETWEEN THE SHD RISING EDGE AND NEXT SHP FALLING EDGE.

2. CCD SIGNAL IS SAMPLED AT SHP AND SHD RISING EDGES.

SHP

SHD

DATACLK

OUTPUT

DATA

CCD

SIGNAL

Figure 5. CCD-Mode Timing

CCD

SIGNAL

EFFECTIVE PIXELS

CLPOB

CLPDM

OPTICAL BLACK PIXELS

HORIZONTAL

BLANKING DUMMY PIXELS EFFECTIVE PIXELS

PBLK

NOTES:

1. CLPOB AND CLPDM WILL OVERWRITE PBLK. PBLK WILL NOT AFFECT CLAMP OPERATION IF OVERLAPPING CLPDM AND/OR CLPOB.

2. PBLK SIGNAL IS OPTIONAL.

3. DIGITAL OUTPUT DATA WILL BE ALL ZEROS DURING PBLK. OUTPUT DATA LATENCY IS 9 DATACLK CYCLES.

OUTPUT

DATA

EFFECTIVE PIXEL DATA OB PIXEL DATA DUMMY BLACK EFFECTIVE DATA

Figure 6. Ty ical CCD-Mode Line Clam Timing

DATACLK

OUTPUT

DATA

VIDEO

SIGNAL

NN+1

N+2

N+8

N+9

N–10 N–9N–8N–1N

tID

tCP

tOD tH

Figure 7. AUX-Mode Timing

AD9843A

–10– REV. 0

SERIAL INTERFACE TIMING AND INTERNAL REGISTER DESCRIPTION

Table I. Internal Register Map

Name A0 A1 A2 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10

Operation 0 0 0 Channel Select Power-Down Software OB Clamp 0*1** 0*0*0*

CCD/AUX Modes Reset On/Off

VGA Gain 1 0 0 LSB MSB X

Clamp Level 0 1 0 LSB MSB X X X

Control 1 1 0 0*0*0*CDS Gain Clock Polarity Select for 0*0*Three- X

On/Off SHP/SHD/CLP/DATA State

CDS Gain 0 0 1 LSB MSB X X X X X

Internal use only, must be set to zero. **Should be set to one.

SDATA

SCK

RNW TEST

0A2 0

A0 A1 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10

tDS tDH

tLS tLH

NOTES:

1. SDATA BITS ARE INTERNALLY LATCHED ON THE RISING EDGES OF SCK.

2. RNW = READ-NOT WRITE. SET LOW FOR WRITE OPERATION.

3. TEST BIT = INTERNAL USE ONLY. MUST BE SET LOW.

4. SYSTEM UPDATE OF LOADED REGISTERS OCCURS ON SL RISING EDGE.

Figure 8. Serial Write O eration

SDATA

SCK

RNW TEST

A0 A1 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10

NOTES:

1. RNW = READ-NOT WRITE. SET HIGH FOR READ OPERATION.

2. TEST BITS = INTERNAL USE ONLY. MUST BE SET LOW.

3. SERIAL DATA FROM THE SELECTED REGISTER IS VALID STARTING AFTER THE 5TH SCK FALLING EDGE, AND IS UPDATED ON SCK

FALLING EDGES.

Figure 9. Serial Readback O eration

SDATA

SCK

A0 A1

D0 D2 D3 D10

RNW

00 D9

000 D0

12173534

26166543 44

...

... ...

10 BITS

AGC GAIN

D7 D0 D9

...

... ... ...

NOTES:

1. ANY NUMBER OF ADJACENT REGISTERS MAY BE LOADED SEQUENTIALLY, BEGINNING WITH THE LOWEST ADDRESS AND INCREMENTING

ONE ADDRESS AT A TIME.

2. WHEN SEQUENTIALLY LOADING MULTIPLE REGISTERS, THE EXACT REGISTER LENGTH (SHOWN ABOVE) MUST BE USED FOR EACH REGISTER.

3. ALL LOADED REGISTERS WILL BE SIMULTANEOUSLY UPDATED WITH THE RISING EDGE OF SL.

8 BITS

CLAMP LEVEL

10 BITS

CONTROL

11 BITS

OPERATION

D1 D0 D2 D3D1

18 19 20789

Figure 10. Continuous Serial Write O eration to Multi le Registers

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