Datasheet

AD9920A
Rev. B | Page 6 of 112
Parameter Test Conditions/Comments Min Typ Max Unit
BLACK LEVEL CLAMP
Clamp Level Resolution 1024 Steps
Clamp Level Measured at ADC output
Minimum Clamp Level Code 0 0 LSB
Maximum Clamp Level Code 1023 255 LSB
ADC
Resolution 12 Bits
Differential Nonlinearity (DNL)
2
±0.5 LSB
No Missing Codes Guaranteed
Integral Nonlinearity (INL)
2
±3.0 LSB
Full-Scale Input Voltage 2.0 V
VOLTAGE REFERENCE
Reference Top Voltage (REFT) 1.4 V
Reference Bottom Voltage (REFB) 0.4 V
SYSTEM PERFORMANCE Includes entire signal chain
Gain Accuracy 0 dB CDS gain
Low Gain
VGA Code 15
Gain = (0.0358 × code) + 5.76 dB
5.7 6.2 6.7 dB
Maximum Gain VGA Code 1023 41.8 42.3 42.8 dB
Peak Nonlinearity, 1 V Input Signal
2
6 dB VGA gain, 0 dB CDS gain applied 0.1 0.3 %
Total Output Noise
2
AC-grounded input, 6 dB VGA gain
applied
0.6 LSB rms
Power Supply Rejection (PSR)
2
Measured with step change on supply 40 dB
1
Input signal characteristics are defined as shown in Figure 2.
2
See the Terminology section.
800mV
MAXIMUM
MINIMUM INPUT LIMIT
(AVSS – 0.3V)
0V (AVSS)
1V MAXIMUM INPUT SIGNAL RANGE
(0dB CDS GAIN)
+1.3V TYP (AVDD – 0.5V)
DC RESTORE VOLTAGE
+1.8V TYP (AVDD)
MAXIMUM INPUT LIMIT = LESSER OF
2.2V OR AVDD + 0.3V
200mV MAX
OPTICAL BLACK PIXEL
500mV TYP
RESET TRANSIENT
06878-002
Figure 2. Input Signal Characteristics