AD9943/AD9944
AD9944 SYSTEM SPECIFICATIONS
TMIN to TMAX, AVDD = DVDD = DRVDD = 3 V, fSAMP = 25 MHz, unless otherwise noted.
Table 4.
Parameter
Min Typ
Max Unit
Conditions
CDS
Maximum Input Range before Saturation1
1.0
500
100
V p-p
mV
mV
1
Allowable CCD Reset Transient
See input waveform in footnote.
1
Maximum CCD Black Pixel Amplitude
VARIABLE GAIN AMPLIFIER (VGA)
Gain Control Resolution
Gain Monotonicity
Gain Range
1024
Guaranteed
Steps
Minimum Gain
Maximum Gain
5.3
41.5
dB
dB
See Figure 13 for VGA gain curve.
See Variable Gain Amplifier section for VGA
gain equation.
40
BLACK LEVEL CLAMP
Clamp Level Resolution
Clamp Level
256
Steps
Measured at ADC output.
Minimum Clamp Level
Maximum Clamp Level
A/D CONVERTER
0
255
LSB
LSB
Resolution
Differential Nonlinearity (DNL)
No Missing Codes
12
Bits
LSB
0.4
Guaranteed
Straight binary
2.0
Data Output Coding
Full-Scale Input Voltage
VOLTAGE REFERENCE
Reference Top Voltage (REFT)
Reference Bottom Voltage (REFB)
SYSTEM PERFORMANCE
Gain Range
V
2.0
1.0
V
V
Specifications include entire signal chain.
Low Gain (VGA Code = 0)
Maximum Gain (VGA Code = 1023)
Gain Accuracy
Peak Nonlinearity 500 mV Input Signal
Total Output Noise
5.3
41.5
1
0.1
0.9
50
dB
dB
dB
%
40
12 dB gain applied.
LSB rms AC grounded input, 6 dB gain applied.
dB Measured with step change on supply.
Power Supply Rejection (PSR)
1 Input signal characteristics defined as follows:
500mV TYP
RESET TRANSIENT
100mV TYP
1V TYP
INPUT SIGNAL RANGE
OPTICAL BLACK PIXEL
Rev. B | Page 5 of 20