Ultralow Noise
Drivers for Low Voltage ADCs
ADA4930-1/ADA4930-2
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
Low input voltage noise: 1.2 nV/√Hz
Low common-mode output: 0.9 V on single supply
Extremely low harmonic distortion
−104 dBc HD2 at 10 MHz
−79 dBc HD2 at 70 MHz
−73 dBc HD2 at 100 MHz
ADA4930-1
12 PD
–FB
+IN
–IN
1
2
3
4
11 –OUT
10 +OUT
+FB
9 V
OCM
−101 dBc HD3 at 10 MHz
−82 dBc HD3 at 70 MHz
−75 dBc HD3 at 100 MHz
High speed
Figure 1.
ADA4930-2
Figure 2.
−3 dB bandwidth of 1.35 GHz, G = 1
Slew rate: 3400 V/μs, 25% to 75%
0.1 dB gain flatness to 380 MHz
Fast overdrive recovery of 1.5 ns
0.5 mV typical offset voltage
Externally adjustable gain
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Single-supply operation: 3.3 V or 5 V
–IN1
+FB1
1
18 +OUT1
17 V
2
3
4
5
6
OCM1
16 –V
+V
S2
S2
S1
–V
15
14
+V
S1
–FB2
+IN2
PD2
13 –OUT2
100
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
10
Line drivers
1
GENERAL DESCRIPTION
The ADA4930-1/ADA4930-2 are very low noise, low distortion,
high speed differential amplifiers. They are an ideal choice for
driving 1.8 V high performance ADCs with resolutions up to
14 bits from dc to 70 MHz. The adjustable output common
mode allows the ADA4930-1/ADA4930-2 to match the input of
the ADC. The internal common-mode feedback loop provides
exceptional output balance, suppression of even-order harmonic
distortion products, and dc level translation.
0
10
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 3. Voltage Noise Spectral Density
The low dc offset and excellent dynamic performance of the
ADA4930-1/ADA4930-2 make them well suited for a wide
variety of data acquisition and signal processing applications.
With the ADA4930-1/ADA4930-2, differential gain configurations
are easily realized with a simple external feedback network of
four resistors determining the closed-loop gain of the amplifier.
The ADA4930-1 is available in a Pb-free, 3 mm × 3 mm 16-lead
LFCSP, and the ADA4930-2 is available in a Pb-free, 4 mm × 4 mm
24-lead LFCSP. The pinout has been optimized to facilitate printed
circuit board (PCB) layout and minimize distortion. The ADA4930-1
is specified to operate over the −40°C to +105°C temperature range,
and the ADA4930-2 is specified to operate over the −40°C to +105°C
temperature range for 3.3 V or 5 V supply voltages.
The ADA4930-1/ADA4930-2 are fabricated using Analog Devices,
Inc., proprietary silicon-germanium (SiGe), complementary
bipolar process, enabling them to achieve very low levels of
distortion with an input voltage noise of only 1.2 nV/√Hz.
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
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
©2010 Analog Devices, Inc. All rights reserved.
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