AD9844A 데이터 시트보기 (PDF) - Analog Devices

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AD9844A

Complete 12-Bit 20 MSPS CCD Signal Processor

Analog Devices 

AD9844A

CCD-MODE SPECIFICATIONS (TMIN to TMAX, AVDD = DVDD = 3.0 V, fDATACLK = fSHP = fSHD = 20 MHz, unless otherwise noted.)

Parameter

Min Typ Max

Unit

Notes

POWER CONSUMPTION

78

mW

See TPC 1 for Power Curves

MAXIMUM CLOCK RATE

20

MHz

CDS

Allowable CCD Reset Transient1

500

Max CCD Black Pixel Amplitude1

Max Input Range Before Saturation1

200

1.0

Max Input Range Before Saturation

1.5

Max Input Range Before Saturation

0.5

Max Output Range

1.6

Gain Resolution

64

Gain Range (Two’s Complement Coding)

Min Gain (CDS Gain Register Code 32)

–2

Medium Gain (CDS Gain Code 63)

4

Max Gain (CDS Gain Code 31)

10

mV

mV

V p-p

V p-p

V p-p

V p-p

Steps

dB

dB

dB

See Input Waveform in Note 1

With 4 dB CDS Gain

With –2 dB CDS Gain

With 10 dB CDS Gain

At Any CDS Gain Setting

See Figure 12 for CDS Gain Curve

4 dB Is Default with CDS Gain Disabled

VARIABLE GAIN AMPLIFIER (VGA)

Max Input Range

Max Output Range

Gain Control Resolution

Gain Monotonicity

Gain Range

Low Gain (VGA Register Code 91)

Max Gain (VGA Code 1023)

1.6

2.0

1024

Guaranteed

2

36

V p-p

V p-p

Steps

dB

dB

See Figure 13 for VGA Gain Curve

See Figure 13 for Gain Equations

BLACK LEVEL CLAMP

Clamp Level Resolution

Clamp Level

Min Clamp Level

Max Clamp Level

256

Steps

Measured at ADC Output

0

LSB

255

LSB

SYSTEM PERFORMANCE

Gain Accuracy, VGA Code 91 to 1023

–0.5

+0.5

Peak Nonlinearity, 500 mV Input Signal

0.1

Peak Nonlinearity, 800 mV Input Signal

0.4

Total Output Noise

0.6

Power Supply Rejection (PSR)

40

dB

%

%

LSB rms

dB

Specifications Include Entire Signal Chain

Use Equations on Page 13 to Calculate Gain

12 dB Gain Applied (4 dB CDS Gain)

8 dB Gain Applied (4 dB CDS Gain)

AC Grounded Input, 6 dB Gain Applied

Measured with Step Change on Supply

POWER-UP RECOVERY TIME

From Fast Recovery Mode

From Reference Standby Mode

From Total Shutdown Mode

From Power-Off Condition

Clocks Must Be Applied, as in Figures 5 and 6

0.1

ms

1

ms

3

ms

15

ms

NOTES

1Input Signal Characteristics defined as follows, with 4 dB CDS gain:

500mV TYP

RESET

TRANSIENT

200mV MAX

OPTICAL

BLACK PIXEL

1V MAX

INPUT

SIGNAL RANGE

Specifications subject to change without notice.

REV. 0

–3–

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