AD9979
Rev. C | Page 6 of 56
ANALOG SPECIFICATIONS
AVDD = 1.8 V, fCLI = 65 MHz, typical timing specifications, tMIN to tMAX, unless otherwise noted.
Table 4.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
Allowable CCD Reset Transient
0.5
0.8
V
CDS Gain Accuracy
3.0 dB CDS Gain
–3.7
–3.2
–2.7
dB
0 dB CDS Gain (Default)
–0.9
–0.4
+0.1
dB
+3 dB CDS Gain
+1.9
+2.4
+2.9
dB
+6 dB CDS Gain
+4.3
+4.8
+5.3
dB
Maximum Input Voltage
VGA gain = 6.3 dB, Code 15 (default value)
3 dB CDS Gain
1.4
V p-p
0 dB CDS Gain (Default)
1.0
V p-p
+3 dB CDS Gain
0.7
V p-p
+6 dB CDS Gain
0.5
V p-p
Allowable Optical Black Pixel Amplitude
0 dB CDS Gain (Default)
–100
+200
mV
+6 dB CDS Gain
–50
+100
mV
VARIABLE GAIN AMPLIFIER (VGA)
Gain Control Resolution
1024
Steps
Gain Monotonicity
Guaranteed
Low Gain Setting
6
dB
VGA Code 15 (default)
Maximum Gain Setting
42
dB
VGA Code 1023
BLACK LEVEL CLAMP
Clamp Level Resolution
1024
Steps
Minimum Clamp Level (Code 0)
0
LSB
Measured at ADC output
Maximum Clamp Level (Code 1023)
1023
LSB
Measured at ADC output
ANALOG-TO-DIGITAL CONVERTER (ADC)
Resolution
14
Bits
Differential Nonlinearity (DNL)
–1.0
± 0.5
+1.2
LSB
No Missing Codes
Guaranteed
Integral Nonlinearity (INL)
5
16
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
Specifications include entire signal chain
VGA Gain Accuracy
0 dB CDS gain (default)
Low Gain (Code 15)
5.1
5.6
6.1
dB
Gain = (0.0359 × code) + 5.1 dB
Maximum Gain (Code 1023)
41.3
41.8
42.3
dB
Peak Nonlinearity, 500 mV Input Signal
0.1
0.4
%
12 dB total gain applied
Total Output Noise
2
LSB rms
AC grounded input, 6 dB gain applied
Power Supply Rejection (PSR)
45
dB
Measured with step change on supply
1 Input signal characteristics are defined as shown in Figure 2. 200mV MAX
OPTICAL BLACK PIXEL
MINIMUM INPUT LIMIT
(AVSS – 0.3V)
MAXIMUM INPUT LIMIT =
LESSER OF 2.2V
OR (AVDD + 0.3V)
+1.8V TYP (AVDD)
0V (AVSS)
+1.3V TYP (AVDD – 0.5V)
DC RESTORE VOLTAGE
500mV TYP
RESET TRANSIENT
800mV
MAXIMUM
1V MAXIMUM INPUT
SIGNAL RANGE
(0dB CDS GAIN)
05
95
7
-00
2
Figure 2. Input Signal Characteristics