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ADA4937-1_16

更新时间： 2024-11-27 01:14:51
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亚德诺 - ADI /
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Ultralow Distortion Differential ADC Driver

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ADA4937-1_16 数据手册

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Ultralow Distortion  
Differential ADC Driver  
ADA4937-1/ADA4937-2  
Data Sheet  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
ADA4937-1  
Extremely low harmonic distortion (HD)  
−112 dBc HD2 at 10 MHz  
−84 dBc HD2 at 70 MHz  
−77 dBc HD2 at 100 MHz  
−102 dBc HD3 at 10 MHz  
−91 dBc HD3 at 70 MHz  
−84 dBc HD3 at 100 MHz  
–FB  
+IN  
1
2
3
4
12  
PD  
11 –OUT  
10  
9
–IN  
+OUT  
+FB  
V
OCM  
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  
Figure 1. ADA4937-1  
ADA4937-2  
Differential-to-differential or single-ended-to-differential  
operation  
Adjustable output common-mode voltage  
Single-supply operation: 3.3 V to 5 V  
1
2
3
4
5
6
18  
17  
16  
15  
14  
–IN1  
+OUT1  
+FB1  
V
OCM1  
–V  
–V  
+V  
S1  
S2  
S2  
+V  
S1  
–FB2  
+IN2  
PD2  
APPLICATIONS  
13 –OUT2  
ADC drivers  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Figure 2. ADA4937-2  
–55  
–60  
Line drivers  
HD2, V = 5.0V  
S
HD3, V = 5.0V  
S
GENERAL DESCRIPTION  
HD2, V = 3.3V  
S
–65  
HD3, V = 3.3V  
S
The ADA4937-1/ADA4937-2 are low noise, ultralow distortion,  
high speed differential amplifiers. They are 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 ADA4937-1/ADA4937-2 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.  
–70  
–75  
–80  
–85  
–90  
–95  
–100  
–105  
–110  
–115  
With the ADA4937-1/ADA4937-2, differential gain configurations  
are easily realized with a simple external feedback network of  
four resistors that determine the closed-loop gain of the amplifier.  
1
10  
FREQUENCY (MHz)  
100  
Figure 3. Harmonic Distortion vs. Frequency  
The ADA4937-1/ADA4937-2 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 2.2 nV/√Hz.  
The low dc offset and excellent dynamic performance of the  
ADA4937-1/ADA4937-2 make them well-suited for a wide  
variety of data acquisition and signal processing applications.  
The ADA4937-1/ADA4937-2 are 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 ADA4937-1/ADA4937-2 are specified to operate over the  
automotive (−40°C to +105°C) temperature range and between  
3.3 V and 5 V supplies.  
Rev. F  
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 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 ©2007–2016 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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