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AD10242BZ Datasheet(PDF) 10 Page - Analog Devices

Part # AD10242BZ
Description  Dual, 12-Bit, 40 MSPS MCM A/D Converter with Analog Input Signal Conditioning
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD10242BZ Datasheet(HTML) 10 Page - Analog Devices

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ANALOG INPUT FREQUENCY – MHz
60
0
510
40
20
ENCODE = 40 MSPS
AIN = 1dBFs
SNR (dB)
30
50
10
20
29.2
34.5
52.5
60.95
70
80
SFDR (dBFS)
Figure 18. SNR/Harmonics to AIN > Nyquist MSPS
–10–
REV. A
AD10242–Typical Performance Characteristics
INPUT FREQUENCY – MHz
0.5
3
05
2
1.5
1
2.5
10
15
20
25
30
40
0
–0.5
45
50
55
35
ENCODE = 40 MSPS
Figure 19. Gain Flatness vs. Input Frequency
THEORY OF OPERATION
Refer to the block diagram. The AD10242 employs three
monolithic ADI components per channel (AD9631, OP279, and
AD9042), along with multiple passive resistor networks and de-
coupling 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 approxi-
mately 0.4 V to the noninverting input of the internal AD9631
amplifier.
The AD9631 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 AD9631 was chosen for its superior ac performance and in-
put drive capabilities which have limited the ability of many am-
plifiers to drive high performance ADCs. As new amplifiers are
developed, pin compatible improvements are planned to incor-
porate the latest operational amplifier technology.
The OP279 provides the buffer and inversion of the internal ref-
erence of the AD9042 in order to supply the summing node of
the AD9631 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.
0.01µF
TTL OR CMOS
SOURCE
ENCODE
ENCODE
AD10242
Figure 20. Single-Ended TTL/CMOS Encode
The AD10242 encode inputs are connected to a differential in-
put stage (see Figure 4 under EQUIVALENT CIRCUITS).
With no input connected to either the ENCODE or input, the
voltage divider bias the inputs to 1.6 volts. 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
as there are no performance benefits beyond that range and care
should be taken to avoid the absolute maximum ratings.


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