10-Bit 60 MSPS
A/D Converter
a
AD9020
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Monolithic 10-Bit/60 MSPS Converter
TTL Outputs
Bipolar (؎1.75 V) Analog Input
56 dB SNR @ 2.3 MHz Input
Low (45 pF) Input Capacitance
MIL-STD-883-Compliant Versions Available
MSB
INVERT
ANALOG IN
OVERFLOW
LSBS
INVERT
+V
REF
+V
SENSE
R/2
R
AD9020
512
385
APPLICATIONS
Digital Oscilloscopes
Medical Imaging
Professional Video
Radar Warning/Guidance Systems
Infrared Systems
OVERFLOW
R/2
R/2
3/4
REF
C
O
M
P
A
R
A
T
384
OVERFLOW
R
R
D
D
D
D
D
D
D
D
D
D
(MSB)
9
8
7
6
5
4
3
2
1
0
D
E
C
O
D
E
GENERAL DESCRIPTION
257
256
The AD9020 A/D converter is a 10-bit monolithic converter
capable of word rates of 60 MSPS and above. Innovative archi-
tecture using 512 input comparators instead of the traditional
1024 required by other flash converters reduces input capaci-
tance and improves linearity.
L
A
T
C
H
R/2
R/2
1/2
O
R
REF
10
1024
L
O
G
I
L
A
T
C
H
E
S
R
R
Encode and outputs are TTL-compatible, making the AD9020
an ideal candidate for use in low power systems. An over-
flow bit is provided to indicate analog input signals greater
C
129
128
(LSB)
R/2
R/2
1/4
REF
than +VSENSE
Voltage sense lines are provided to insure accurate driving of the
REF voltages applied to the units. Quarter-point taps on the
.
R
R
V
resistor ladder help optimize the integral linearity of the unit.
Either 68-pin ceramic leaded (gull wing) packages or ceramic
LCCs are available and are specifically designed for low thermal
impedances. Two performance grades for temperatures of both
0°C to 70°C and –55°C to +125°C ranges are offered to allow
the user to select the linearity best suited for each application.
Dynamic performance is fully characterized and production
tested at 25°C. MIL-STD-883 units are available.
2
1
R
R/2
–V
SENSE
–V
REF
ENCODE
The AD9020 A/D Converter is available in versions compliant
with MIL-STD-883. Refer to the Analog Devices Military Prod-
ucts Databook or current AD9020/883B data sheet for detailed
specifications.
GROUND
–V
S
+V
S
REV. C
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reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2001