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ADA4940-2 数据表(PDF) 1 Page - Analog Devices

部件名 ADA4940-2
功能描述  Ultralow Power, Low Distortion
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADA4940-2 数据表(HTML) 1 Page - Analog Devices

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Ultralow Power, Low Distortion
Fully Differential ADC Driver
Data Sheet
ADA4940-1/ADA4940-2
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
FEATURES
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
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
APPLICATIONS
Low power PulSAR®/SAR ADC drivers
Single-ended-to-differential conversion
Differential buffers
Line drivers
Medical imaging
Industrial process controls
Portable electronics
GENERAL DESCRIPTION
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.
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.
FUNCTIONAL BLOCK DIAGRAMS
1
–FB
2
+IN
3
–IN
4
+FB
11 –OUT
12 DISABLE
10 +OUT
9
VOCM
ADA4940-1
ADA4940-2
1
–IN1
2
+FB1
3
+VS1
4
+VS1
5
–FB2
6
+IN2
15 –VS2
16 –VS2
17 VOCM1
18 +OUT1
14 DISABLE2
13 –OUT2
Figure 1.
0
–160
–140
–120
–100
–80
–60
–40
–20
0
20k
40k
60k
80k
100k
FREQUENCY (Hz)
+DIN
–DIN
R1
R2
R4
R3
+IN
–OUT
CF
33Ω
2.5V
AD7982
ADA4940-1
33Ω
2.7nF
2.7nF
CF
+OUT
+
–IN
IN+
IN– GND
VDD
REF
VOCM
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
Product
Isupply
(mA)
Bandwidth
(MHz)
Slew Rate
(V/µs)
Noise
(nV/√Hz)
AD8137
3
110
450
8.25
ADA4932-x
9
560
2800
3.6
ADA4941-1
2.2
31
22
5.1
Table 2. Complementary Products to the ADA4940-1/ADA4940-2
Product
Power
(mW)
Throughput
(MSPS)
Resolution
(Bits)
SNR
(dB)
AD7982
7.0
1
18
98
AD7984
10.5
1.333
18
96.5
AD7621
65
3
16
88
AD7623
45
1.333
16
88


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