AD9945(RevC) データシートの表示（PDF） - Analog Devices

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AD9945
(Rev.:RevC)

Complete 12-Bit 40 MHz CCD Signal Processor

Analog Devices 

AD9945

SYSTEM SPECIFICATIONS (TMIN to TMAX , AVDD = DVDD = DRVDD = 3.0 V, fSAMP= 40 MHz, Register 0xD = 0x838,

unless otherwise noted.)

Parameter

Min Typ Max Unit

Notes

CDS

Maximum Input Range before Saturation*

1.0

Allowable CCD Reset Transient*

500

Maximum CCD Black Pixel Amplitude*

100

Vp-p

mV

mV

See Input Waveform in Footnote

VARIABLE GAIN AMPLIFIER (VGA)

Gain Control Resolution

Gain Monotonicity

Gain Range

Minimum Gain

Maximum Gain

Low Gain Mode

1024

Guaranteed

40.0

¦1.5

5.3

41.5

0

+1.5

Steps

dB

See Figure 7 for VGA Gain Curve

dB

See Variable Gain Amplifier section for VGA gain equation

dB

See Table 1, Internal Register Map, for register information

BLACK LEVEL CLAMP

Clamp Level Resolution

Clamp Level

Minimum Clamp Level

Maximum Clamp Level

256

Steps

Measured at ADC Output

0

LSB

255

LSB

A/D CONVERTER

Resolution

Differential Nonlinearity (DNL)

No Missing Codes

Data Output Coding

Full-Scale Input Voltage

12

Bits

± 0.5

LSB

Guaranteed

Straight Binary

2.0

V

VOLTAGE REFERENCE

Reference Top Voltage (REFT)

Reference Bottom Voltage (REFB)

2.0

V

1.0

V

SYSTEM PERFORMANCE

Gain Range

Low Gain (VGA Code = 0)

Maximum Gain (VGA Code = 1023)

Gain Accuracy

Peak Nonlinearity, 500 mV Input Signal

Total Output Noise

Power Supply Rejection (PSR)

5.3

40.0 41.5

؎1.0

0.1

1.2

40

Specifications Include Entire Signal Chain

dB

dB

dB

%

LSB rms

dB

12 dB Gain Applied

AC Grounded Input, 6 dB Gain Applied

*Input Signal Characteristics defined as follows:

500mV TYP

RESET TRANSIENT

100mV TYP

OPTICAL BLACK PIXEL

1V TYP

INPUT SIGNAL RANGE

Specifications subject to change without notice.

REV. C

–3–

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