REV. A
–3–
AD9847
ANALOG SPECIFICATIONS
(T
MIN
to T
MAX
, AVDD = DVDD = 3.0 V,
f
CLI
= 40 MHz, unless otherwise noted.)
Parameter Min Typ Max Unit Notes
CDS
Gain 0 dB
Allowable CCD Reset Transient* 500 mV
Max Input Range before Saturation* 1.0 V p-p
Max CCD Black Pixel Amplitude* 150 mV
PIXEL GAIN AMPLIFIER (PxGA)
Max Input Range 1.0 V p-p
Max Output Range 1.6 V p-p
Gain Control Resolution 64 Steps
Gain Monotonicity Guaranteed
Gain Range
Min Gain (32) –2 dB
Med Gain (0) 4 dB
Med Gain (4 dB) Is Default Setting
Max Gain (31) 10 dB
VARIABLE GAIN AMPLIFIER (VGA)
Max Input Range 1.6 V p-p
Max Output Range 2.0 V p-p
Gain Control Resolution 1024 Steps
Gain Monotonicity Guaranteed
Gain Range
Low Gain (91) 2 dB
Max Gain (1023) 36 dB
BLACK LEVEL CLAMP
Clamp Level Resolution 256 Steps
Clamp Level Measured at ADC Output
Min Clamp Level (0) 0 LSB
Max Clamp Level (255) 63.75 LSB
A/D CONVERTER
Resolution 10 Bits
Differential Nonlinearity (DNL) ± 0.4 ± 1.0 LSB
No Missing Codes Guaranteed
Full-Scale Input Voltage 2.0 V
VOLTAGE REFERENCE
Reference Top Voltage (VRT) 2.0 V
Reference Bottom Voltage (VRB) 1.0 V
SYSTEM PERFORMANCE Specifications Include Entire
Signal Chain
Gain Accuracy Gain Includes 4 dB Default PxGA
Low Gain (91) 5 6 7 dB
Max Gain (1023) 38 dB
Peak Nonlinearity, 500 mV Input Signal 0.2 % 12 dB Gain Applied
Total Output Noise 0.25 LSB rms AC Grounded Input, 6 dB Gain Applied
Power Supply Rejection (PSR) 40 dB Measured with Step Change on Supply
*Input signal characteristics defined as follows:
500mV TYP
RESET
TRANSIENT
150mV MAX
OPTICAL
BLACK PIXEL
1V MAX
INPUT
SIGNAL RANGE
Specifications subject to change without notice.
