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ADA4938-1_15

更新时间： 2024-11-27 01:20:31
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亚德诺 - ADI /
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Ultralow Distortion Differential ADC Driver

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ADA4938-1_15 数据手册

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Ultralow Distortion  
Differential ADC Driver  
ADA4938-1/ADA4938-2  
FUNCTIONAL BLOCK DIAGRAMS  
FEATURES  
Extremely low harmonic distortion (HD)  
−106 dBc HD2 @ 10 MHz  
−82 dBc HD2 @ 50 MHz  
−109 dBc HD3 @ 10 MHz  
−82 dBc HD3 @ 50 MHz  
Low input voltage noise: 2.6 nV/√Hz  
High speed  
ADA4938-1  
12 PD  
–FB  
+IN  
–IN  
1
2
3
4
11 –OUT  
10 +OUT  
+FB  
9 V  
OCM  
−3 dB bandwidth of 1000 MHz, G = +1  
Slew rate: 4700 V/μs  
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  
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  
–IN1  
+FB1  
1
2
3
4
5
6
18 +OUT1  
17 V  
OCM1  
16 –V  
+V  
S2  
S2  
S1  
ADA4938-2  
–V  
15  
14  
+V  
S1  
–FB2  
+IN2  
PD2  
13 –OUT2  
APPLICATIONS  
ADC drivers  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Figure 2. ADA4938-2 Functional Block Diagram  
–50  
–60  
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  
Line drivers  
–70  
GENERAL DESCRIPTION  
–80  
The ADA4938-x is a low noise, ultralow distortion, high speed  
differential amplifier. It is an ideal choice for driving high per-  
formance 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 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.  
–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-x. A simple external feedback  
network of four resistors determines the closed-loop gain of the  
amplifier.  
Figure 3. SFDR vs. Frequency and Output Voltage  
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 parts are specified to operate over the  
extended industrial temperature range of −40°C to +85°C.  
The ADA4938-x is 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. The low dc offset and excellent dynamic  
performance of the ADA4938-x make it well-suited for a wide  
variety of data acquisition and signal processing applications.  
Rev. A  
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  
www.analog.com  
Fax: 781.461.3113 ©2007–2009 Analog Devices, Inc. All rights reserved.  
 
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