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ADA4937-1_15 PDF预览

ADA4937-1_15

更新时间: 2024-11-24 01:20:31
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Ultralow Distortion Differential ADC Driver

ADA4937-1_15 数据手册

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Ultralow Distortion  
Differential ADC Driver  
Data Sheet  
ADA4937-1/ADA4937-2  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
Extremely low harmonic distortion (HD)  
−112 dBc HD2 @ 10 MHz  
−84 dBc HD2 @ 70 MHz  
−77 dBc HD2 @ 100 MHz  
−102 dBc HD3 @ 10 MHz  
−91 dBc HD3 @ 70 MHz  
ADA4937-1  
12 PD  
–FB  
+IN  
–IN  
1
2
3
4
11 –OUT  
10 +OUT  
+FB  
9
V
OCM  
−84 dBc HD3 @ 100 MHz  
Low input voltage noise: 2.2 nV/√Hz  
High speed  
−3 dB bandwidth of 1.9 GHz, G = 1  
Slew rate: 6000 V/µs, 25% to 75%  
Fast overdrive recovery of 1 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 to 5 V  
Figure 1. ADA4937-1  
–IN1  
+FB1  
1
18 +OUT1  
17 V  
2
3
4
5
6
OCM1  
16 –V  
15  
14  
+V  
S2  
S2  
S1  
ADA4937-2  
–V  
+V  
S1  
–FB2  
+IN2  
PD2  
13 –OUT2  
APPLICATIONS  
ADC drivers  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Figure 2. ADA4937-2  
–55  
–60  
HD2, V = 5.0V  
S
HD3, V = 5.0V  
HD2, V = 3.3V  
HD3, V = 3.3V  
Line drivers  
S
S
–65  
S
GENERAL DESCRIPTION  
–70  
The ADA4937-xis a low noise, ultralow distortion, high speed  
differential amplifier. It is an ideal choice for driving high  
performance ADCs with resolutions up to 16 bits from dc to  
100 MHz. The adjustable level of the output common mode  
allows the ADA4937-x to match the input of the ADC. The  
internal common-mode feedback loop also provides exceptional  
output balance as well as suppression of even-order harmonic  
distortion products.  
–75  
–80  
–85  
–90  
–95  
–100  
–105  
–110  
–115  
With the ADA4937-x, differential gain configurations are easily  
realized with a simple external feedback network of four resis-  
tors that determine the closed-loop gain of the amplifier.  
1
10  
100  
FREQUENCY (MHz)  
Figure 3. Harmonic Distortion vs. Frequency  
The ADA4937-x is available in a Pb-free, 3 mm × 3 mm, 16-lead  
LFCSP (ADA4937-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead  
LFCSP (ADA4937-2, dual). The pinout has been optimized to  
facilitate PCB layout and minimize distortion. The ADA4937-x  
is specified to operate over the automotive (−40°C to +105°C)  
temperature range and between 3.3 V and 5 V supplies.  
The ADA4937-x is fabricated using Analog Devices, Inc., proprie-  
tary silicon-germanium (SiGe), complementary bipolar process,  
enabling it to achieve very low levels of distortion with an input  
voltage noise of only 2.2 nV/√Hz. The low dc offset and excellent  
dynamic performance of the ADA4937-x make it well-suited  
for a wide variety of data acquisition and signal processing appli-  
cations.  
Rev. D  
Document Feedback  
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 registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2007–2013 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 

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