AD9944_15 datasheet(5/20 Pages) AD

Part #	AD9944

Description	Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors

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Manufacturer	AD [Analog Devices]

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Data Sheet

AD9943/AD9944

Parameter

Min

Typ

Max

Unit

Conditions

VOLTAGE REFERENCE

Reference Top Voltage (REFT)

2.0

V

Reference Bottom Voltage (REFB)

1.0

V

SYSTEM PERFORMANCE

Specifications include entire signal chain.

Gain Range

Low Gain (VGA Code = 0)

5.3

dB

Maximum Gain (VGA Code = 1023)

40

41.5

dB

Gain Accuracy

±1

dB

Peak Nonlinearity 500 mV Input Signal

0.1

%

12 dB gain applied.

Total Output Noise

0.9

LSB rms

AC grounded input, 6 dB gain applied.

Power Supply Rejection (PSR)

50

dB

Measured with step change on supply.

1

Input signal characteristics defined as follows:

TIMING SPECIFICATIONS

CL = 20 pF, fSAMP = 25 MHz. See CCD-mode timing in Figure 14 and Figure 15, and serial timing in Figure 10 and Figure 11.

Table 4.

Parameter

Symbol

Min

Typ

Max

Unit

SAMPLE CLOCKS

DATACLK, SHP, SHD Clock Period

tCONV

40

ns

DATACLK High/Low Pulse Width

tADC

16

20

ns

SHP Pulse Width

tSHP

10

ns

SHD Pulse Width

tSHD

10

ns

CLPOB Pulse Width1

tCOB

2

20

Pixels

SHP Rising Edge to SHD Falling Edge

tS1

10

ns

SHP Rising Edge to SHD Rising Edge

tS2

16

20

ns

Internal Clock Delay

tID

3.0

ns

DATA OUTPUTS

Output Delay

tOD

9.5

ns

Pipeline Delay

9

Cycles

SERIAL INTERFACE

Maximum SCK Frequency

fSCLK

10

MHz

SL to SCK Setup Time

tLS

10

ns

SCK to SL Hold Time

tLH

10

ns

SDATA Valid to SCK Rising Edge Setup

tDS

10

ns

SCK Falling Edge to SDATA Valid Hold

tDH

10

ns

1 Minimum CLPOB pulse width is for functional operation only. Wider typical pulses are recommended to achieve low noise clamp performance.

100mV TYP

OPTICAL BLACK PIXEL

500mV TYP

RESET TRANSIENT

1V TYP

INPUT SIGNAL RANGE

Rev. C | Page 5 of 20

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