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ADA4940-2ACPZ-R2

更新时间： 2024-11-23 07:18:47
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亚德诺 - ADI 运算放大器放大器电路PC
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32页 919K
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Ultralow Power, Low Distortion

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ADA4940-2ACPZ-R2 数据手册

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Ultralow Power, Low Distortion  
Fully Differential ADC Driver  
Data Sheet  
ADA4940-1/ADA4940-2  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
Small signal bandwidth: 260 MHz  
Ultralow power 1.25mA  
Extremely low harmonic distortion  
−122 dB THD at 50 kHz  
−96 dB THD at 1 MHz  
Low input voltage noise: 3.9 nV/√Hz  
0.35 mV maximum offset voltage  
Balanced outputs  
ADA4940-1  
–IN1 1  
+FB1 2  
18 +OUT1  
17 V  
12 DISABLE  
11 –OUT  
–FB  
1
OCM1  
16 –V  
+IN 2  
–IN 3  
+V  
+V  
3
4
S2  
S2  
S1  
ADA4940-2  
–V  
15  
14  
S1  
10 +OUT  
–FB2 5  
+IN2 6  
DISABLE2  
+FB  
4
9 V  
OCM  
13 –OUT2  
Settling time to 0.1%: 34 ns  
Rail-to-rail output: −VS + 0.1 V to +VS − 0.1 V  
Adjustable output common-mode voltage  
Flexible power supplies: 3 V to 7 V (LFCSP)  
Disable pin to reduce power consumption  
ADA4940-1 is available in LFCSP and SOIC packages  
Figure 1.  
0
C
F
+D  
IN  
2.5V  
IN+ REF VDD  
–20  
–40  
–60  
–80  
R3  
R4  
+
33Ω  
+IN  
–OUT  
2.7nF  
2.7nF  
V
AD7982  
APPLICATIONS  
OCM  
ADA4940-1  
+OUT  
33Ω  
IN–  
GND  
–IN  
Low power PulSAR®/SAR ADC drivers  
Single-ended-to-differential conversion  
Differential buffers  
–
R1  
R2  
–D  
IN  
C
F
–100  
–120  
–140  
–160  
Line drivers  
Medical imaging  
Industrial process controls  
Portable electronics  
GENERAL DESCRIPTION  
0
20k  
40k  
60k  
80k  
100k  
FREQUENCY (Hz)  
The ADA4940-1/ADA4940-2 are low noise, low distortion fully  
differential amplifiers with very low power consumption. They  
are an ideal choice for driving low power, high resolution, high  
performance SAR and sigma-delta (Σ-Δ) analog-to-digital  
converters (ADCs) with resolutions up to 16 bits from dc to  
1 MHz on only 1.25 mA of quiescent current. The adjustable  
level of the output common-mode voltage allows the ADA4940-1/  
ADA4940-2 to match the input common-mode voltage of  
multiple ADCs. The internal common-mode feedback loop  
provides exceptional output balance, as well as suppression of  
even-order harmonic distortion products.  
Figure 2. ADA4940-1 Driving the AD7982 ADC  
The ADA4940-1 is available in a Pb-free, 3 mm × 3 mm, 16-lead  
LFCSP, and an 8-lead SOIC. The ADA4940-2 is available in a Pb-  
free, 4 mm × 4 mm, 24-lead LFCSP. The pinout is optimized to  
facilitate printed circuit board (PCB) layout and minimize  
distortion. The ADA4940-1/ADA4940-2 are specified to  
operate over the −40°C to +125°C temperature range.  
Table 1. Similar Products to the ADA4940-1/ADA4940-2  
Isupply  
(mA)  
Bandwidth  
(MHz)  
Slew Rate  
(V/µs)  
Noise  
(nV/√Hz)  
Product  
AD8137  
ADA4932-x  
ADA4941-1  
3
9
2.2  
110  
560  
31  
450  
2800  
22  
8.25  
3.6  
5.1  
With the ADA4940-1/ADA4940-2, differential gain configurations  
are easily realized with a simple external feedback network of  
four resistors determining the closed-loop gain of the amplifier.  
The ADA4940-1/ADA4940-2 are fabricated using Analog Devices,  
Inc., SiGe complementary bipolar process, enabling them to  
achieve very low levels of distortion with an input voltage noise  
of only 3.9 nV/√Hz. The low dc offset and excellent dynamic  
performance of the ADA4940-1/ADA4940-2 make them well  
suited for a variety of data acquisition and signal processing  
applications.  
Table 2. Complementary Products to the ADA4940-1/ADA4940-2  
Power  
(mW)  
Throughput  
(MSPS)  
Resolution  
(Bits)  
SNR  
(dB)  
Product  
AD7982  
AD7984  
AD7621  
AD7623  
7.0  
10.5  
65  
1
18  
18  
16  
16  
98  
96.5  
88  
1.333  
3
1.333  
45  
88  
Rev. B  
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 www.analog.com  
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.  
 
 
 
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ADA4940-2ACPZ-R2 替代型号

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