AD9840A datasheet(3/16 Pages) AD

3 / 16 page

–3–

REV. 0

AD9840A

Parameter

Min

Typ

Max

Unit

Notes

POWER CONSUMPTION

155

MAXIMUM CLOCK RATE

MHz

CDS

Allowable CCD Reset Transient

500

See Input Waveform in Note 1

Max CCD Black Pixel Amplitude

200

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

Steps

Gain Range (Two’s Complement Coding)

See Figure 15 for CDS Gain Curve

Min Gain (CDS Gain Register Code 32)

–2

Medium Gain (CDS Gain Code 63)

4 dB is Default with CDS Gain Disabled

Max Gain (CDS Gain Code 31)

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)

See Page 12 for Gain Equations

Max Gain (VGA Code 1023)

BLACK LEVEL CLAMP

Clamp Level Resolution

256

Steps

Clamp Level

Measured at ADC Output

Min Clamp Level

LSB

Max Clamp Level

63.75

LSB

SYSTEM PERFORMANCE

Specifications Include Entire Signal Chain

Gain Accuracy, VGA Code 91 to 1023

–1.0

+1.0

Use Equations on Page 12 to Calculate Gain

Peak Nonlinearity, 500 mV Input Signal

0.4

12 dB Gain Applied (4 dB CDS Gain)

Total Output Noise

0.25

LSB rms

AC Grounded Input, 6 dB Gain Applied

Power Supply Rejection (PSR)

Measured with Step Change on Supply

POWER-UP RECOVERY TIME

Clocks Must Be Applied, as in Figures 8 and 9

From Fast Recovery Mode

0.1

From Reference Standby Mode

From Total Shutdown Mode

From Power-Off Condition

NOTES

1Input 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 (T

MIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 40 MHz, unless otherwise noted.)

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