AD9845AJST View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9845AJST

Mixed-Signal Front-End (MxFE) Processor for Broadband Communications

Analog Devices 

AD9845A

CCD-MODE SPECIFICATIONS (TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 30 MHz, unless otherwise noted.)

Parameter

Min Typ Max

Unit

Notes

POWER CONSUMPTION

140

mW

See TPC 1 for Power Curves

MAXIMUM CLOCK RATE

30

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

V p-p

OBSOLETE Max Output Range

1.6

Gain Control Resolution

64

Gain Monotonicity

Guaranteed

Gain Range (Two’s Complement Coding)

Min Gain (PxGA Gain Code 32)

–2

Max Gain (PxGA Gain Code 31)

10

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

BLACK LEVEL CLAMP

Clamp Level Resolution

256

Clamp Level

V p-p

Steps

dB

dB

V p-p

V p-p

Steps

dB

dB

Steps

See Figure 28 for PxGA Gain Curve

See Figure 29 for VGA Gain Curve

Measured at ADC Output

Min Clamp Level

0

LSB

Max Clamp Level

255

LSB

SYSTEM PERFORMANCE

Gain Accuracy (VGA Code 91 to 1023)2 –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

Total Output Noise

0.6

Power Supply Rejection (PSR)

40

dB

dB

%

LSB rms

dB

Specifications Include Entire Signal Chain

Use Equations on Page 18 to Calculate Gain

VGA Gain Fixed at 2 dB (Code 91)

VGA Gain Fixed at 2 dB (Code 91)

12 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 (Code 63).

Specifications subject to change without notice.

REV. 0

–3–

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