AD9002_15 Datasheet, PDF (1/8 Pages) Analog Devices – High Speed 8-Bit Monolithic A/D Converter

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High Speed 8-Bit
Monolithic A/D Converter
AD9002
FEATURES
150 MSPS ENCODE Rate
Low Input Capacitance: 17 pF
Low Power: 750 mW
–5.2 V Single Supply
MIL-STD-883 Compliant Versions Available
APPLICATIONS
Radar Systems
Digital Oscilloscopes/ATE Equipment
Laser/Radar Warning Receivers
Digital Radio
Electronic Warfare (ECM, ECCM, ESM)
Communication/Signal Intelligence
GENERAL DESCRIPTION
The AD9002 is an 8-bit, high speed, analog-to-digital converter.
The AD9002 is fabricated in an advanced bipolar process that
allows operation at sampling rates in excess of 150 MSPS. Func-
tionally, the AD9002 is comprised of 256 parallel comparator
stages whose outputs are decoded to drive the ECL compatible
output latches.
An exceptionally wide, large signal, analog input bandwidth of
160 MHz is due to an innovative comparator design and very
close attention to device layout considerations. The wide input
bandwidth of the AD9002 allows very accurate acquisition of
high speed pulse inputs without an external track-and-hold. The
comparator output decoding scheme minimizes false codes,
which is critical to high speed linearity.
The AD9002 provides an external hysteresis control pin that
can be used to optimize comparator sensitivity to further improve
performance. Additionally, the AD9002’s low power dissipation
of 750 mW makes it usable over the full extended temperature
range. The AD9002 also incorporates an overflow bit to indicate
overrange inputs. This overflow output can be disabled with the
overflow inhibit pin.
FUNCTIONAL BLOCK DIAGRAM
OVERFLOW
INH
ANALOG IN
+V_REF
REF_MID
–V_REF
ENCODE
ENCODE
AD9002
R
256
OVERFLOW
R
255
BIT 8 (MSB)
D
E
BIT 7
R
C
128
O
D
L
BIT 6
I
A
R/2
N
T
G
C
BIT 5
H
R/2
L
127
O
BIT 4
G
I
R
C
BIT 3
2
BIT 2
R
1
BIT 1 (LSB)
GND HYSTERESIS
–V_S
The AD9002 is available in two grades, one with 0.5 LSB linearity
and one with 0.75 LSB linearity. Both versions are offered in an
industrial grade, –25°C to +85°C, packaged in a 28-lead DIP
and a 28-leaded JLCC. The military temperature range devices,
–55°C to +125°C, are available in a ceramic DIP package and
complies with MIL-STD-883 Class B.
REV. G
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