AD9020_15 Datasheet, PDF (1/12 Pages) Analog Devices – 10-Bit 60 MSPS A/D Converter

a
10-Bit 60 MSPS
A/D Converter
AD9020
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
GENERAL DESCRIPTION
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.
FUNCTIONAL BLOCK DIAGRAM
ANALOG IN
+V_REF
+V_SENSE
3/4_REF
1/2_REF
1/4_REF
–V_SENSE
–V_REF
ENCODE
MSB
INVERT
OVERFLOW
LSBS
INVERT
R/2
512
AD9020
R
385
R/2
OVERFLOW
R/2
384
C
O
R
M
P
D
R
A
E
257
R
C
A
O
L
R/2
T
D
A
O
E
T
R/2
256
R 1024
10 _C
L
H
R
L
O
A
G
T
I
R
129
C
C
H
R/2
E
S
R/2
128
R
R
2
R
1
R/2
OVERFLOW
D₉ (MSB)
D₈
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀ (LSB)
–V_S +V_S GROUND
REV. C
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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.
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© Analog Devices, Inc., 2001