AD9821 datasheet(3/16 Pages) AD

3 / 16 page

REV. 0

AD9821

–3–

IMAGER-MODE SPECIFICATIONS

Parameter

Min

Typ

Max

Unit

Notes

POWER CONSUMPTION

150

See TPC 1 for Power vs. Sample Rate

MAXIMUM CLOCK RATE

MHz

ANALOG INPUTS (VIN+, VIN–)

Input Common-Mode Range

1.8

Linear operating range for VIN+, VIN–

Max Input Amplitude

1.0

V p-p

Defined as VIN+ minus VIN–

Max Optical Black Pixel Amplitude

±30

For stable Clamp at max VGA gain

VARIABLE GAIN AMPLIFIER (VGA)

Gain Control Resolution

1024

Steps

Gain Monotonicity

Guaranteed

Gain Range

See Figure 11 for VGA Gain Curve

Min Gain (VGA Gain Code 00)

Max Gain (VGA Gain Code 1023)

BLACK LEVEL CLAMP

Clamp Level Resolution

256

Steps

Clamp Level

Measured at ADC Output

Min Clamp Level

LSB

Max Clamp Level

255

LSB

SYSTEM PERFORMANCE

Specifications Include Entire Signal Chain

Gain Accuracy

Min Gain

–1

Max Gain

34.5

35.5

36.5

Peak Nonlinearity, 500 mV Input

0.3

12 dB Gain Applied

Total Output Noise

0.5

LSB rms

AC Grounded Input, 6 dB Gain Applied

Power Supply Rejection (PSR)

Measured with Step Change on Supply

POWER-UP RECOVERY TIME

Normal Clock Signals Applied

Reference Standby Mode

Total Power-Down Mode

Power-Off Condition

*Input Signal Characteristics defined as follows:

30mV MAX

OB PIXEL

1V p-p MAX

INPUT SIGNAL RANGE

VIN+

VIN–

GND

+1.8V

INPUT

CM RANGE

Specifications subject to change without notice.

(TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = 40 MHz, unless otherwise noted.)

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