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PDF AD10242 Data sheet ( Hoja de datos )

Número de pieza AD10242
Descripción 40 MSPS MCM A/D Converter
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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No Preview Available ! AD10242 Hoja de datos, Descripción, Manual

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
AIN3
AIN2
AIN1
UNEG UCOM UPOS
AIN3
AIN2
AIN1
UPOS
UCOM
UNEG
(LSB) D0A
D1A
D2A
D3A
D4A
D5A
D6A
D7A
D8A
REV. D
OP279
AD9632
OP279
AD9632
OP279
AD9042
VREF
12
9
OUTPUT BUFFERING
TIMING
ENC ENC D9A D10A D11A
(MSB)
AD10242
OP279
AD9042
VREF
TIMING
12
OUTPUT BUFFERING
5
7
ENC
ENC
D11B (MSB)
D10B
D9B
D8B
D7B
D0B D1B D2B D3B D4B D5B D6B
(LSB)
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/461-3113
www.analog.com
© 2015 Analog Devices, Inc. All rights reserved.

1 page




AD10242 pdf
AD10242
ABSOLUTE MAXIMUM RATINGS1
Parameter
Min Max Unit
ELECTRICAL
VCC Voltage
VEE Voltage
Analog Input Voltage
Analog Input Current
Digital Input Voltage (ENCODE)
ENCODE, ENCODE Differential Voltage
Digital Output Current
0
–7
VEE
–10
0
–40
7V
0V
VCC V
+10 mA
VCC V
4V
+40 mA
ENVIRONMENTAL2
Operating Temperature (Case)
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec)
Storage Temperature Range (Ambient)
–55 +125 °C
175 °C
300 °C
–65 +150 °C
NOTES
1Absolute maximum ratings are limiting values to be applied individually, and beyond
which the serviceability of the circuit may be impaired. Functional operability is not
necessarily implied. Exposure to absolute maximum rating conditions for an
extended period of time may affect device reliability.
2Typical thermal impedances for ES-68-1 package: θJC = 11°C/W; θJA = 30°C/W.
Table I. Output Coding
MSB LSB
Base 10
0111111111111
0000000000001
0000000000000
1111111111111
1000000000000
2047
+1
0
–1, 4095
–2047, 2048
Input
+FS
0.0 V
–FS
EXPLANATION OF TEST LEVELS
Test Level
I – 100% Production Tested.
II – 100% production tested at 25°C, and sample tested at
specified temperatures. AC testing done on sample basis.
III – Sample Tested Only.
IV – Parameter is guaranteed by design and characterization
testing.
V – Parameter is a typical value only.
VI – All devices are 100% production tested at 25°C; sample
tested at temperature extremes.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD10242 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
–4– REV. D

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AD10242 arduino
AD10242
80
70
SNR (dB)
60
50 SFDR (dBFS)
40
30
20
ENCODE = 40MSPS
10 AIN = 1dBFS
0
5
10
20
29.2
34.5
52.5 60.95
ANALOG INPUT FREQUENCY – MHz
TPC 13. SNR/Harmonics to AIN > Nyquist MSPS
–0.5
0
ENCODE = 40MSPS
0.5
1.0
1.5
2.0
2.5
3.0
0
5 10 15 20 25 30 35 40 45 50 55
INPUT FREQUENCY – MHz
TPC 14. Gain Flatness vs. Input Frequency
THEORY OF OPERATION
Refer to the functional block diagram. The AD10242 employs
three monolithic ADI components per channel (AD9632, OP279,
and AD9042), along with multiple passive resistor networks
and decoupling capacitors to fully integrate a complete 12-bit
analog-to-digital converter.
The input signal is first passed through a precision laser trimmed
resistor divider, allowing the user to externally select operation
with a full-scale signal of ± 0.5 V, ± 1.0 V, or ± 2.0 V by choosing
the proper input terminal for the application. The result of
the resistor divider is to apply a full-scale input of approximately
0.4 V to the noninverting input of the internal AD9632 amplifier.
The AD9632 provides the dc-coupled level shift circuit required
for operation with the AD9042 ADC. Configuring the amplifier
in a noninverting mode, the ac signal gain can be trimmed to
provide a constant input to the ADC centered around the inter-
nal reference voltage of the AD9042. This allows the converter
to be used in multiple system applications without the need for
external gain and level shift circuitry normally requiring trim.
The AD9632 was chosen for its superior ac performance and
input drive capabilities. These two specifications have limited
the ability of many amplifiers to drive high performance ADCs.
As new amplifiers are developed, pin compatible improve-
ments are planned to incorporate the latest operational ampli-
fier technology.
The OP279 provides the buffer and inversion of the internal
reference of the AD9042 in order to supply the summing node
of the AD9632 input amplifier. This dc voltage is then summed
with the input voltage and applied to the input of the AD9042
ADC. The reference voltage of the AD9042 is designed to track
internal offsets and drifts of the ADC and is used to ensure
matching over an extended temperature range of operation.
APPLYING THE AD10242
Encoding the AD10242
The AD10242 is designed to interface with TTL and CMOS
logic families. The source used to drive the ENCODE pin(s)
must be clean and free from jitter. Sources with excessive jitter
will limit SNR and overall performance.
TTL OR CMOS
SOURCE
0.01F
AD10242
ENCODE
ENCODE
Figure 6. Single-Ended TTL/CMOS Encode
The AD10242 encode inputs are connected to a differential
input stage (see Figure 4). With no input connected to either
the ENCODE or ENCODE input, the voltage dividers bias the
inputs to 1.6 V. For TTL or CMOS usage, the encode source
should be connected to ENCODE (Pins 29 and/or 51). ENCODE
(Pins 28 and/or 52) should be decoupled using a low inductance
or microwave chip capacitor to ground. Devices such as AVX
05085C103MA15, a 0.01 µF capacitor, work well.
Performance Improvements
It is possible to improve the performance of the AD10242
slightly by taking advantage of the internal characteristics of the
amplifier and converter combination. By increasing the 5 V
supply slightly, the user may be able to gain up to a 5 dB improve-
ment in SFDR over the entire frequency range of the converter.
It is not recommended to exceed 5.5 V on the analog supplies
since there are no performance benefits beyond that range and
care should be taken to avoid the absolute maximum ratings.
–10–
REV. D

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