a
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
APPLICATIONS
Digital Oscilloscopes
Medical Imaging
Professional Video
Radar Warning/Guidance Systems
Infrared Systems
ANALOG IN
+V
REF
+V
SENSE
R/2
512
10-Bit 60 MSPS
A/D Converter
AD9020
FUNCTIONAL BLOCK DIAGRAM
MSB
INVERT
OVERFLOW
LSBS
INVERT
AD9020
R
385
R/2
3/4
REF
R/2
R
384
OVERFLOW
C
O
M
P
A
R
A
T
O
R
L
A
T
C
H
E
S
OVERFLOW
D
E
C
O
D
E
1024
L
O
G
I
C
10
D
9
(MSB)
D
8
D
7
L
A
T
C
H
D
6
D
5
D
4
D
3
D
2
D
1
D
0
(LSB)
GENERAL DESCRIPTION
R
257
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.
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
than +V
SENSE
.
Voltage sense lines are provided to insure accurate driving of the
±
V
REF
voltages applied to the units. Quarter-point taps on the
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.
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.
R/2
1/2
REF
R/2
R
R
R/2
1/4
REF
R/2
128
256
129
R
R
2
R
1
R/2
–V
SENSE
–V
REF
ENCODE
–V
S
+V
S
GROUND
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
AD [ ANALOG DEVICES ]
