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ADA4938-2ACPZ-R2

更新时间： 2024-11-24 01:07:19
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亚德诺 - ADI /
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Ultralow Distortion Differential ADC Driver

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ADA4938-2ACPZ-R2 数据手册

 浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第2页浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第3页浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第4页浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第5页浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第6页浏览型号ADA4938-2ACPZ-R2的Datasheet PDF文件第7页 
Ultralow Distortion  
Differential ADC Driver  
Data Sheet  
ADA4938-1/ADA4938-2  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
ADA4938-1  
Extremely low harmonic distortion (HD)  
−106 dBc HD2 @ 10 MHz  
TOP VIEW  
−82 dBc HD2 @ 50 MHz  
−109 dBc HD3 @ 10 MHz  
–FB  
+IN  
–IN  
1
2
3
4
12 PD  
−82 dBc HD3 @ 50 MHz  
Low input voltage noise: 2.6 nV/√Hz  
High speed  
−3 dB bandwidth of 1000 MHz, G = +1  
Slew rate: 4700 V/μs  
11 –OUT  
10  
9
+OUT  
+FB  
V
OCM  
0.1 dB gain flatness to 150 MHz  
Fast overdrive recovery of 4 ns  
1 mV typical offset voltage  
Figure 1. ADA4938-1 Functional Block Diagram  
ADA4938-2  
TOP VIEW  
Externally adjustable gain  
Differential-to-differential or single-ended-to-differential  
operation  
Adjustable output common-mode voltage  
Wide supply voltage range: +5 V to 5 V  
Single or dual amplifier configuration available  
1
2
3
4
5
6
18 +OUT1  
–IN1  
V
17  
16  
15  
14  
13  
+FB1  
OCM1  
+V  
S1  
–V  
–V  
S2  
S2  
+V  
S1  
APPLICATIONS  
–FB2  
+IN2  
PD2  
–OUT2  
ADC drivers  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Figure 2. ADA4938-2 Functional Block Diagram  
Line drivers  
–50  
G = +2, V  
G = +2, V  
G = +2, V  
G = +2, V  
= 5V p-p  
= 3.2V p-p  
= 2V p-p  
= 1V p-p  
O, dm  
O, dm  
O, dm  
O, dm  
GENERAL DESCRIPTION  
–60  
The ADA4938-1/ADA4938-2 are low noise, ultralow distortion,  
high speed differential amplifiers. It is an ideal choice for  
driving high performance ADCs with resolutions up to 16 bits  
from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The  
output common-mode voltage is adjustable over a wide range,  
allowing the ADA4938-1/ADA4938-2 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  
–80  
–90  
–100  
–110  
–120  
–130  
1
10  
FREQUENCY (MHz)  
100  
Full differential and single-ended-to-differential gain configurations  
are easily realized with the ADA4938-1/ADA4938-2. A simple  
external feedback network of four resistors determines the  
closed-loop gain of the amplifier.  
Figure 3. SFDR vs. Frequency and Output Voltage  
makes them well-suited for a wide variety of data acquisition and  
signal processing applications.  
The ADA4938-1 (single amplifier) is available in a Pb-free,  
3 mm × 3 mm, 16-lead LFCSP. The ADA4938-2 (dual  
amplifier) is available in a Pb-free, 4 mm × 4 mm, 24-lead  
LFCSP. The pinouts have been optimized to facilitate layout and  
minimize distortion. The devices are specified to operate over  
the extended industrial temperature range of −40°C to +85°C.  
The ADA4938-1/ADA4938-2 are fabricated using the Analog  
Devices, Inc., proprietary third generation, high voltage XFCB  
process, enabling it to achieve very low levels of distortion with  
an input voltage noise of only 2.6 nV/√Hz. e low dc offset and  
excellent dynamic performance of the ADA4938-1/ADA4938-2  
Rev. B  
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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ADA4938-2ACPZ-R2 替代型号

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