AD10242_15 Datasheet, PDF (1/16 Pages) Analog Devices – Dual, 12-Bit, 40 MSPS MCM A/D Converter

a Dual, 12-Bit, 40 MSPS MCM A/D Converter
with Analog Input Signal Conditioning
AD10242
FEATURES
2 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
GENERAL DESCRIPTION
The AD10242 is a complete dual signal chain solution including
on-board amplifiers, references, ADCs, and output buffering
providing 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 AD9632, OP279, and AD9042 in a cus-
tom 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 mini-
mize additional signal conditioning required for multiple functions
within a single system. The heart of the AD10242 is the AD9042,
which is designed specifically for applications requiring wide
dynamic range.
The AD10242 is manufactured on Analog Devices’
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
that allow the user to ac couple the ADC directly, bypassing 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
A_IN2
A_IN1
UNEG UCOM UPOS
A_IN3
A_IN2
A_IN1
UPOS
UCOM
UNEG
(LSB) D0A
D1A
D2A
D3A
D4A
D5A
D6A
D7A
D8A
REV. C
OP279
AD9632
OP279
AD9632
OP279
AD9042
V_REF
12
9
OUTPUT BUFFERING
TIMING
ENC ENC D9A D10A D11A
(MSB)
AD10242
OP279
AD9042
V_REF
TIMING
12
5
OUTPUT BUFFERING
7
ENC
ENC
D11B (MSB)
D10B
D9B
D8B
D7B
D0B D1B D2B D3B D4B D5B D6B
(LSB)
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