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MT-074 Datasheet(PDF) 3 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) 3 Page - Analog Devices

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MT-074
DRIVING PRECISION 16- AND 18-BIT DIFFERENTIAL INPUT ADCs
Figure 3 shows the ADA4941-1 driving the 18-bit PulSAR family of ADCs which have switched
capacitor inputs. This is a common application where the signal is single-ended and bipolar and
the ADC input is differential. Because of the high resolution, the drive amplifier must have low
distortion, low noise, and high dc accuracy, as well as the capability of performing the single-
ended to differential conversion. The ADA4941-1 is a low power (2.2 mA @ 3.3 V), low noise
(10.2 nV/
√Hz @ 1 kHz), low distortion (110 dBc @ 100 kHz) differential driver for ADCs up to
18 bits. Small signal bandwidth is 31 MHz. The amplifier has rail-to-rail output, high input
impedance, and a user-adjustable gain.
The ADA4941-1 consists of two op amps. The lower one in the figure is configured as a non-
commited non-inverting buffer (with external feedback resistor) and drives an inverting
amplifier. The feedforward and feedback resistors for the inverting amplifier are included in the
IC. Although there is extra phase shift and delay through the inverting amplifier, this does not
introduce significant error at the frequencies of interest (up to 1 MHz or 2 MHz).
+5V
+2.1V
+1.75V
9.53k
Ω
10.0k
Ω
8.45k
Ω
0.1µF
0.1µF
11.3k
Ω
4.02k
Ω
806
Ω
ADR444
+5V
VREF = +4.096V
0.1µF
REF
+5V
VDD
IN+
IN–
+
+
CF
V
IN =
± 10V
+2.1V +/– 2V
+2.1V – /+ 2V
ADA4941-1
41.2
Ω
41.2
Ω
3.9nF
3.9nF
AD7690, 400kSPS
AD7691, 250kSPS
18-BIT
PulSAR
ADCs
LPF CUTOFF = 1MHz
V
CM = +2.1V
R
R
0.1µF
V
REF = +4.096V
INPUT RANGE=
8.192V p-p DIFF.
10.2nV/
√Hz
After filter, noise = 13µV rms due to amp
Signal = 8V p-p differential
SNR = 107dB @ ADC input
SNR = 100dB
For AD7690
Figure 3: ADA4941-1 Driving AD7690 18-Bit
PulSAR® ADC in +5V Application
In this application, the two resistor dividers set the output common-mode voltage of the
ADA4941-1 to +2.1 V so that the output only has to go to within 100 mV of ground. This allows
sufficient headroom for the rail-to-rail output stages of the amplifier and allows the entire circuit
to operate on a single +5 V supply.
Page 3 of 5


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