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ADA4939-1YCPZ-RL

更新时间： 2024-11-26 03:13:19
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亚德诺 - ADI 驱动器
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24页 518K
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Ultralow Distortion Differential ADC Driver

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ADA4939-1YCPZ-RL 数据手册

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Ultralow Distortion  
Differential ADC Driver  
ADA4939-1/ADA4939-2  
FUNCTIONAL BLOCK DIAGRAMS  
FEATURES  
Extremely low harmonic distortion  
−102 dBc HD2 @ 10 MHz  
−83 dBc HD2 @ 70 MHz  
−77 dBc HD2 @ 100 MHz  
−101 dBc HD3 @ 10 MHz  
−97 dBc HD3 @ 70 MHz  
ADA4939-1  
12 PD  
–FB  
+IN  
–IN  
1
2
3
4
11 –OUT  
10 +OUT  
+FB  
9
V
OCM  
−91 dBc HD3 @ 100 MHz  
Low input voltage noise: 2.3 nV/√Hz  
High speed  
−3 dB bandwidth of 1.4 GHz, G = 2  
Slew rate: 6800 V/μs, 25% to 75%  
Fast overdrive recovery of <1 ns  
0.5 mV typical offset voltage  
Externally adjustable gain  
Stable for differential gains ≥2  
Differential-to-differential or single-ended-to-differential  
operation  
Figure 1. ADA4939-1  
–IN1  
+FB1  
1
18 +OUT1  
17 V  
2
3
4
5
6
OCM1  
16 –V  
15  
14  
+V  
S2  
S2  
S1  
ADA4939-2  
–V  
+V  
S1  
–FB2  
+IN2  
PD2  
13 –OUT2  
Adjustable output common-mode voltage  
Single-supply operation: 3.3 V to 5 V  
APPLICATIONS  
ADC drivers  
Figure 2. ADA4939-2  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
–60  
–65  
V
= 2V p-p  
OUT, dm  
HD2  
HD3  
–70  
Line drivers  
–75  
GENERAL DESCRIPTION  
–80  
The ADA4939 is 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 output common-mode voltage is user adjustable  
by means of an internal common-mode feedback loop, allowing  
the ADA4939 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.  
–85  
–90  
–95  
–100  
–105  
–110  
1
10  
100  
FREQUENCY (MHz)  
With the ADA4939, differential gain configurations are easily  
realized with a simple external feedback network of four resistors  
that determine the closed-loop gain of the amplifier.  
Figure 3. Harmonic Distortion vs. Frequency  
The ADA4939 is available in a Pb-free, 3 mm × 3 mm 16-lead  
LFCSP (ADA4939-1, single) or a Pb-free, 4 mm × 4 mm 24-lead  
LFCSP (ADA4939-2, dual). The pinout has been optimized to  
facilitate PCB layout and minimize distortion. The ADA4939-1  
and the ADA4939-2 are specified to operate over the −40°C to  
+105°C temperature range; both operate on supplies between  
3.3 V and 5 V.  
The ADA4939 is fabricated using Analog Devices, Inc., proprietary  
silicon-germanium (SiGe), complementary bipolar process,  
enabling it to achieve very low levels of distortion with an input  
voltage noise of only 2.3 nV/√Hz. The low dc offset and excellent  
dynamic performance of the ADA4939 make it well suited for a  
wide variety of data acquisition and signal processing applications.  
Rev. 0  
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  
©2008 Analog Devices, Inc. All rights reserved.  
 
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ADA4939-1YCPZ-RL 替代型号

型号 品牌 替代类型 描述 数据表
ADA4939-1YCPZ-R7 ADI

完全替代

 Ultralow Distortion Differential ADC Driver
ADA4939-1YCPZ-R2 ADI

完全替代

 Ultralow Distortion Differential ADC Driver
ADA4950-1YCPZ-R7 ADI

类似代替

 Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3

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