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ADA4941-1YR-EBZ

更新时间： 2024-11-23 12:29:07
品牌 Logo 应用领域
亚德诺 - ADI 驱动器
页数 文件大小 规格书
24页 500K
描述
Single-Supply, Differential 18-Bit ADC Driver

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Single-Supply, Differential  
18-Bit ADC Driver  
ADA4941-1  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Single-ended-to-differential converter  
Excellent linearity  
Distortion −110 dBc @100 KHz for VO, dm = 2 V p-p  
Low noise: 10.2 nV/√Hz, output-referred, G = 2  
Extremely low power: 2.2 mA (3 V supply)  
High input impedance: 24 MΩ  
8
1
2
3
FB  
REF  
V+  
IN  
7
DIS  
V–  
6
User-adjustable gain  
OUT+  
4
5
OUT–  
High speed: 31 MHz, −3 dB bandwidth (G = +2)  
Fast settling time: 300 ns to 0.005% for a 2 V step  
Low offset: 0.8 mV max, output-referred, G = 2  
Rail-to-rail output  
Figure 1.SOIC/LSCSP Pinout  
Disable feature  
Wide supply voltage range: 2.7 V to 12 V  
Available in space-saving, 3 mm × 3 mm LFCSP  
–60  
–65  
–70  
–75  
V
= 6V p-p  
O
–80  
–85  
APPLICATIONS  
–90  
Single-supply data acquisition systems  
Instrumentation  
Process control  
Battery-power systems  
Medical instrumentation  
–95  
–100  
–105  
–110  
–115  
–120  
–125  
–130  
–135  
–140  
V
= 2V p-p  
O
HD2  
HD3  
HD2  
HD3  
0.1  
1
10  
FREQUENCY (kHz)  
1000  
100  
Figure 2. Distortion vs. Frequency at Various Output Amplitudes  
GENERAL DESCRIPTION  
The ADA4941-1 is a low power, low noise differential driver for  
ADCs up to 18 bits in systems that are sensitive to power. The  
ADA4941-1 is configured in an easy-to-use, single-ended-to-  
differential configuration and requires no external components  
for a gain of 2 configuration. A resistive feedback network can  
be added to achieve gains greater than 2. The ADA4941-1  
provides essential benefits, such as low distortion and high  
SNR, that are required for driving high resolution ADCs.  
The ADA4941-1 is ideal for driving the 16-bit and 18-bit  
PulSAR® ADCs such as the AD7687, AD7690, and AD7691.  
The ADA4941-1 is manufactured on ADI’s proprietary second-  
generation XFCB process, which enables the amplifier to  
achieve 18-bit performance on low supply currents.  
The ADA4941-1 is available in a small 8-lead LFCSP as well as a  
standard 8-lead SOIC and is rated to work over the extended  
industrial temperature range, −40°C to +125°C.  
With a wide input voltage range (0 V to 3.9 V on a single 5 V  
supply), rail-to-rail output, high input impedance, and a user-  
adjustable gain, the ADA4941-1 is designed to drive single-  
supply ADCs with differential inputs found in a variety of low  
power applications, including battery-operated devices and  
single-supply data acquisition systems.  
Rev. C  
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 ©2006–2011 Analog Devices, Inc. All rights reserved.  
 
 
 
 
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