Dual, 12-Bit, 40 MSPS MCM A/D Converter
with Analog Input Signal Conditioning
a
AD10242
FEATURES
T he AD10242 operates with ±5.0 V for the analog signal condi-
Tw o Matched ADCs w ith Input Signal Conditioning
Selectable Bipolar Input Voltage Range
(؎0.5 V, ؎1.0 V, ؎2.0 V)
Full MIL-STD-883B Com pliant
80 dB Spurious-Free Dynam ic Range
Trim m ed Channel-Channel Matching
tioning with a separate +5.0 V supply for the analog-to-digital
conversion. Each channel is completely independent allowing
operation with independent encode or analog inputs. T he
AD10242 also offers the user a choice of analog input signal
ranges to minimize additional signal conditioning required for
multiple functions within a single system. T he heart of the
AD10242 is the AD9042 which is designed specifically for appli-
cations requiring wide dynamic range.
APPLICATIONS
Radar Processing
T he AD10242 is manufactured by Analog Devices on our
MIL-PRF-38534 MCM line and is completely qualified. Units
are packaged in a custom cofired ceramic 68-lead gull wing
package and specified for operation from –55°C to +125°C.
Contact the factory for additional custom options including
those which allow the user to ac couple the ADC directly, by-
passing the front end amplifier section. Also see the AD9042
data sheet for additional details on ADC performance.
Com m unications Receivers
FLIR Processing
Secure Com m unications
Any I/ Q Signal Processing Application
P RO D UCT D ESCRIP TIO N
T he AD10242 is a complete dual signal chain solution including
onboard amplifiers, references, ADCs, and output buffering pro-
viding unsurpassed total system performance. Each channel is
laser trimmed for gain and offset matching and provides channel-
to-channel crosstalk performance better than 80 dB. The AD10242
utilizes two each of the AD9631, OP279, and the AD9042 in a
custom MCM to gain space, performance, and cost advantages
over solutions previously available.
P RO D UCT H IGH LIGH TS
1. Guaranteed sample rate of 40 MSPS.
2. Dynamic performance specified over entire Nyquist band;
spurious signals @ 80 dBc for –1 dBFS input signals.
3. Low power dissipation: <2 W off ±5.0 V supplies.
4. User defined input amplitude.
5. Packaged in 68-lead ceramic leaded chip carrier.
FUNCTIO NAL BLO CK D IAGRAM
A
1
A
2
A
1
A
2
A
3
A
3
UNEG UCOM UPOS
IN
62
IN
7
IN
6
IN
63
IN
64
IN
8
56
55
57
12
UPOS
OP279
OP279
AD9631
AD9631
AD9042
4
3
UCOM
UNEG
OP279
OP279
AD9042
52
51
ENC
(LSB) D0A 17
D1A 18
TIMING
ENC
V
V
REF
REF
D2A 19
49
48
47
46
45
D11B (MSB)
D10B
20
21
22
23
24
25
D3A
D4A
D5A
D6A
D7A
D8A
AD10242
12
OUTPUT BUFFERING
12
9
5
D9B
OUTPUT BUFFERING
7
D8B
D7B
TIMING
32
D10A
29
ENC
28
ENC
31
37
40
42
D6B
33
36
38
39
41
D11A
(MSB)
D9A
D0B D1B
(LSB)
D2B
D3B
D4B
D5B
REV. A
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
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© Analog Devices, Inc., 1997