Ultralow Noise
Drivers for Low Voltage ADCs
Data Sheet ADA4930-1/ADA4930-2
Rev. B Document Feedback
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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
−101 dBc HD3 at 10 MHz
−82 dBc HD3 at 70 MHz
−75 dBc HD3 at 100 MHz
High speed
−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
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
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.
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/ADA4930-2 are fabricated using Analog
Devices, Inc., proprietary silicon-germanium (SiGe), comple-
mentary bipolar process, enabling them to achieve very low
levels of distortion with an input voltage noise of only 1.2 nV/√Hz.
FUNCTIONAL BLOCK DIAGRAMS
1–FB
2+IN
3–IN
4+FB
11 –OUT
12 PD
10 +OUT
9V
OCM
5
+V
S
6
+V
S
7
+V
S
8
+V
S
15
–V
S
16
–V
S
14
–V
S
13
–V
S
ADA4930-1
09209-001
Figure 1.
ADA4930-2
1–IN1
2+FB1
3+V
S1
4+V
S1
5–FB2
6+IN2
15
–V
S2
16 –V
S2
17 V
OCM1
18 +OUT1
14
PD2
13 –OUT2
7
–IN2
8
+FB2
9
+V
S2
11
V
OCM
2
12
+OUT2
10
+V
S2
21
–V
S1
22
–V
S1
23
–FB1
24
+IN1
20
PD1
19
–OUT1
09209-002
Figure 2.
0
1
10
100
10 100 1k 10k 100k 1M 10M 100M
V
N
(nV/
hz)
FREQUENCY (Hz)
09209-003
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.
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.
