a
Dual, 12-Bit, 40 MSPS MCM A/D Converter
with Analog Input Signal Conditioning
AD10242
The AD10242 operates with
±
5.0 V for the analog signal condi-
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. The
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. The heart of the
AD10242 is the AD9042 which is designed specifically for appli-
cations requiring wide dynamic range.
The 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.
PRODUCT HIGHLIGHTS
FEATURES
Two Matched ADCs with Input Signal Conditioning
Selectable Bipolar Input Voltage Range
( 0.5 V, 1.0 V, 2.0 V)
Full MIL-STD-883B Compliant
80 dB Spurious-Free Dynamic Range
Trimmed Channel-Channel Matching
APPLICATIONS
Radar Processing
Communications Receivers
FLIR Processing
Secure Communications
Any I/Q Signal Processing Application
PRODUCT DESCRIPTION
The 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.
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.
FUNCTIONAL BLOCK DIAGRAM
A
IN
3
8
A
IN
2
7
A
IN
1
6
UNEG
56
UCOM
55
UPOS
57
A
IN
3
64
A
IN
2
63
A
IN
1
62
UPOS
12
OP279
OP279
AD9631
AD9631
UCOM
4
UNEG
3
OP279
(LSB) D0A
17
D1A
18
D2A
19
D3A
20
D4A
21
D5A
22
D6A
23
D7A
24
D8A
25
28
29
31
32
AD9042
V
REF
OP279
AD9042
TIMING
V
REF
52
51
ENC
ENC
12
9
OUTPUT BUFFERING
AD10242
49
D11B (MSB)
D10B
D9B
D8B
D7B
12
5
OUTPUT BUFFERING
7
48
47
46
45
TIMING
37
40
42
33
36
38
39
41
ENC
ENC
D9A
D10A D11A
(MSB)
D0B
(LSB)
D1B
D2B
D3B
D4B
D5B
D6B
REV. A
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
which 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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
AD [ ANALOG DEVICES ]
