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ADA4950-1YCP-EBZ

更新时间： 2024-11-27 01:14:51
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亚德诺 - ADI /
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26页 600K
描述
Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3

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ADA4950-1YCP-EBZ 数据手册

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Low Power, Selectable Gain  
Differential ADC Driver, G = 1, 2, 3  
ADA4950-1/ADA4950-2  
Data Sheet  
FEATURES  
High performance at low power  
FUNCTIONAL BLOCK DIAGRAMS  
ADA4950-1  
High speed  
−3 dB bandwidth of 750 MHz, G = 1  
0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω  
Slew rate: 2900 V/µs, 25% to 75%  
Fast 0.1% settling time of 9 ns  
Low power: 9.5 mA per amplifier  
Low harmonic distortion  
PD  
12  
+INB  
+INA  
–INA  
–INB  
1
2
3
4
11 –OUT  
10  
+OUT  
9
V
OCM  
108 dB SFDR @ 10 MHz  
98 dB SFDR @ 20 MHz  
Figure 1. ADA4950-1  
Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO  
0.2 mV typical input offset voltage  
Selectable differential gains of 1, 2, and 3  
Differential-to-differential or single-ended-to-differential  
operation  
ADA4950-2  
Adjustable output common-mode voltage  
Input common-mode range shifted down by 1 VBE  
Wide supply range: +3 V to 5 V  
1
2
3
4
5
6
18  
17  
–INA1  
–INB1  
+OUT1  
V
OCM1  
16 –V  
+V  
S1  
S2  
S2  
15  
14  
13  
–V  
+V  
S1  
Available in 16-lead and 24-lead LFCSP packages  
+INB2  
+INA2  
PD2  
–OUT2  
APPLICATIONS  
ADC drivers  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Figure 2. ADA4950-2  
Line drivers  
–40  
–50  
V
= 2V p-p  
OUT, dm  
GENERAL DESCRIPTION  
–60  
The ADA4950-1/ADA4950-2 are gain-selectable versions of the  
ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors.  
They are ideal choices for driving high performance ADCs as single-  
ended-to-differential or differential-to-differential amplifiers. The  
output common-mode voltage is user adjustable by means of an  
internal common-mode feedback loop, allowing the ADA4950-1/  
ADA4950-2 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.  
HD2, ±5V  
HD3, ±5V  
HD2, ±2.5V  
HD3, ±2.5V  
–70  
–80  
–90  
–100  
–110  
–120  
–130  
–140  
Differential gain configurations of 1, 2, and 3 are easily realized  
with internal feedback networks that are connected externally  
to set the closed-loop gain of the amplifier.  
0.1  
1
10  
FREQUENCY (MHz)  
100  
Figure 3. Harmonic Distortion vs. Frequency at Various Supplies  
The ADA4950-1/ADA4950-2 are fabricated using the Analog  
Devices, Inc., proprietary silicon-germanium (SiGe) complementary  
bipolar process, enabling them to achieve low levels of distortion and  
noise at low power consumption. The low offset and excellent  
dynamic performance of the ADA4950-x make it well suited for  
a wide variety of data acquisition and signal processing applications.  
The devices are available in a Pb-free, 3 mm × 3 mm, 16-lead  
LFCSP (ADA4950-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead  
LFCSP (ADA4950-2, dual). The pinout has been optimized to  
facilitate PCB layout and minimize distortion. The ADA4950-1/  
ADA4950-2 are specified to operate over the −40°C to +105°C  
temperature range; both operate on supplies from +3 V to 5 V.  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks 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 ©2009–2015 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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