Low Power, Selectable Gain
Differential ADC Driver, G = 1, 2, 3
ADA4950-1/ADA4950-2
Data Sheet
FEATURES
High performance at low power
FUNCTIONAL BLOCK DIAGRAMS
ADA4950-1
High speed
−3 dB bandwidth of 750 MHz, G = 1
0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω
Slew rate: 2900 V/µs, 25% to 75%
Fast 0.1% settling time of 9 ns
Low power: 9.5 mA per amplifier
Low harmonic distortion
PD
12
+INB
+INA
–INA
–INB
1
2
3
4
11 –OUT
10
+OUT
9
V
OCM
108 dB SFDR @ 10 MHz
98 dB SFDR @ 20 MHz
Figure 1. ADA4950-1
Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
0.2 mV typical input offset voltage
Selectable differential gains of 1, 2, and 3
Differential-to-differential or single-ended-to-differential
operation
ADA4950-2
Adjustable output common-mode voltage
Input common-mode range shifted down by 1 VBE
Wide supply range: +3 V to 5 V
1
2
3
4
5
6
18
17
–INA1
–INB1
+OUT1
V
OCM1
16 –V
+V
S1
S2
S2
15
14
13
–V
+V
S1
Available in 16-lead and 24-lead LFCSP packages
+INB2
+INA2
PD2
–OUT2
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Figure 2. ADA4950-2
Line drivers
–40
–50
V
= 2V p-p
OUT, dm
GENERAL DESCRIPTION
–60
The ADA4950-1/ADA4950-2 are gain-selectable versions of the
ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors.
They are ideal choices for driving high performance ADCs as single-
ended-to-differential or differential-to-differential amplifiers. The
output common-mode voltage is user adjustable by means of an
internal common-mode feedback loop, allowing the ADA4950-1/
ADA4950-2 output to match the input of the ADC. The internal
feedback loop also provides exceptional output balance as well
as suppression of even-order harmonic distortion products.
HD2, ±5V
HD3, ±5V
HD2, ±2.5V
HD3, ±2.5V
–70
–80
–90
–100
–110
–120
–130
–140
Differential gain configurations of 1, 2, and 3 are easily realized
with internal feedback networks that are connected externally
to set the closed-loop gain of the amplifier.
0.1
1
10
FREQUENCY (MHz)
100
Figure 3. Harmonic Distortion vs. Frequency at Various Supplies
The ADA4950-1/ADA4950-2 are fabricated using the Analog
Devices, Inc., proprietary silicon-germanium (SiGe) complementary
bipolar process, enabling them to achieve low levels of distortion and
noise at low power consumption. The low offset and excellent
dynamic performance of the ADA4950-x make it well suited for
a wide variety of data acquisition and signal processing applications.
The devices are available in a Pb-free, 3 mm × 3 mm, 16-lead
LFCSP (ADA4950-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead
LFCSP (ADA4950-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4950-1/
ADA4950-2 are specified to operate over the −40°C to +105°C
temperature range; both operate on supplies from +3 V to 5 V.
Rev. B
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Tel: 781.329.4700 ©2009–2015 Analog Devices, Inc. All rights reserved.
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