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MT-074 Datasheet(PDF) 4 Page - Analog Devices

Part # MT-074
Description  Differential Drivers for Precision ADCs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

MT-074 Datasheet(HTML) 4 Page - Analog Devices

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MT-074
The input range of the AD7690 and AD7691 is 2
⋅V
REF p-p differential. The reference used is the
ADR444 which is a 4.096 V reference. The 41.2
Ω resistors and the 3.9 nF capacitors for a
lowpass filter with a cutoff frequency of 1 MHz, suitable for use with the AD7690 which has an
input bandwidth of 9 MHz. The ADA4941-1 has an output noise spectral density of 10.2 nV/
√Hz
for the configuration selected. Integrated over the filter bandwidth, this is 13 µV rms. This
corresponds to an SNR due to the op amp of 107 dB, which is 7 dB better than the 100 dB SNR
of the ADC.
Figure 4 shows another example of driving a high performance iCMOS™ Pulsar™ ADC (e.g.,
AD7634). There are many industrial applications where signals as great as ±10 V are standard.
The iCMOS family of ADCs was developed to handle these applications. Most iCMOS Pulsar
ADCs have differential inputs. Here, the ADA4922-1 is driving a 16-bit or 18-bit iCMOS
PulSAR ADC. It performs a single-ended to differential conversion.
+12V
+5V
VDD
IN+
IN–
+
+
+ / – 10V
–/ + 10V
ADA4922-1
41.2
Ω
41.2
Ω
3.9nF
3.9nF
18, 16-BIT
iCMOS
PulSAR
ADCs
(e.g., AD7634)
LPF CUTOFF = 1MHz
OUTPUT
V
N = 12nV/√Hz
R
R
–12V
VIN = ± 10V
0.1µF
0.1µF
VCC
VEE
0.1µF
0.1µF
0.1µF
AD7634
SNR = 100dB
After filter, noise = 15µV rms due to amp
Signal = 40V p-p differential
SNR = 119dB @ ADC input
Figure 4: ADA4922-1 Driving AD7634 18-Bit iCMOS PulSAR ADC
in ±12V Industrial Application
The ADA4922-1 is a differential driver for 16-bit to 18-bit ADCs that have differential input
ranges up to 40 V p-p. Small signal bandwidth is 38 MHz. The ADA4922-1 is manufactured on
ADI’s proprietary second-generation XFCB process that enables the amplifier to achieve
excellent noise and distortion performance on high supply voltages.
Noise calculations using the 1 MHz lowpass filter yield 15 µV rms for the op amp. The signal
range of the ADC is 40 V p-p, which is 14.14 V rms. This yields an SNR of 119 dB due to the op
amp alone.
Page 4 of 5


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