AD9842A View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9842A

Complete 20 MSPS CCD Signal Processors

Analog Devices 

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

1.0

Max Output Range

1.6

Gain Control Resolution

Gain Monotonicity

Gain Range (Two’s Complement Coding)

Min Gain (PxGA Gain Code 32)

Max Gain (PxGA Gain Code 31)

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

+0.5

PxGA Gain Accuracy

Min Gain (PxGA Register Code 32)

–1

0

+1

Max Gain (PxGA Code 31)

11

12

13

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

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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