AD9845B datasheet(3/24 Pages) AD

3 / 24 page

REV.

–3–

AD9845B

Parameter

Min

Typ

Max

Unit

Notes

POWER CONSUMPTION

153

See TPC 1 for Power Curves

MAXIMUM CLOCK RATE

MHz

CDS

Gain

Allowable CCD Reset Transient

500

Max Input Range before Saturation

1.0

V p-p

PxGA Gain at 4 dB

Max CCD Black Pixel Amplitude

200

PIXEL GAIN AMPLIFIER (PxGA)

Max Input Range

1.0

V p-p

Max Output Range

1.6

V p-p

Gain Control Resolution

Steps

Gain Monotonicity

Guaranteed

Gain Range (Twos Complement Coding)

See Figure 28 for PxGA Gain Curve

Min Gain (PxGA Gain Code 32)

–2.5

Max Gain (PxGA Gain Code 31)

9.5

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 29 for VGA Gain Curve

Low Gain (VGA Gain Code 77)

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

Gain = (0.0353

Code) + 3.3

Low Gain (VGA Code 77)

5.5

6.5

Max Gain (VGA Code 1023)

38.2

39.5

40.2

Peak Nonlinearity, 500 mV Input Signal

0.1

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 Shutdown Mode

Power-Off Condition

NOTES

1Input signal characteristics defined as follows:

200mV MAX

OPTICAL BLACK PIXEL

500mV TYP

RESET TRANSIENT

1V MAX

INPUT SIGNAL RANGE

2PxGA gain fixed at Code 63 (3.3 dB).

Specifications subject to change without notice.

CCD MODE SPECIFICATIONS (T

MIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 30 MHz, unless otherwise noted.)

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