AD10242 Datasheet, PDF (1/16 Pages) Analog Devices – Dual, 12-Bit, 40 MSPS MCM A/D Converter with Analog Input Signal Conditioning

a Dual, 12-Bit, 40 MSPS MCM A/D Converter
with Analog Input Signal Conditioning
AD10242
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.
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
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_IN3
8
A_IN2
7
A_IN1
6
UNEG UCOM UPOS
56
55
57
A_IN3
64
A_IN2
63
A_IN1
62
UPOS 12
UCOM 4
OP279
AD9631
OP279
AD9631
UNEG 3
(LSB) D0A 17
D1A 18
D2A 19
D3A 20
D4A 21
D5A 22
D6A 23
D7A 24
D8A 25
OP279
AD9042
V_REF
12
9
OUTPUT BUFFERING
TIMING
28
29
ENC ENC
31
D9A
32
33
D10A D11A
(MSB)
AD10242
OP279
AD9042
V_REF
TIMING
12
5
OUTPUT BUFFERING
7
52 ENC
51 ENC
49 D11B (MSB)
48 D10B
47 D9B
46 D8B
45 D7B
36
37
D0B D1B
(LSB)
38
D2B
39
D3B
40
D4B
41
D5B
42
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.
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© Analog Devices, Inc., 1997