AD614 Analog Devices, AD614 Datasheet

AD614

Manufacturer Part Number

AD614

Description

Manufacturer

Analog Devices

Datasheet

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ments. The high speed of the AD612/AD614 provide higher

throughput rates in multichannel data acquisition systems.

version (AD614A or B).

APPLICATIONS

The AD612/AD614 offer exceptional quality and value to the

data acquisition designer, either as a signal conditioner per

channel or as a high speed instrumentation

channel data acquisition systems, analytical instruments and

transducer interfacing.

High CMR, input protection, low noise and excellent tempera-

ture stability make the AD612/AD614 an excellent choice for

precise measurement and control in harsh industrial environ-

worst-case operating conditions. Three versions (A, B, C) of

the AD612 are available which provide superior dc character-

The AD612/AD614 are designed to provide high speed and

high accuracy signal conditioning. It provides input offset drift

of 1pV/C max, output offset drift of :t75pV/C

accuracy version (AD612C) or 160kHz small signal bandwidth

and settling time to 0.01 % of 30ps max in the high speed

& B) versions provide superior dynamic performance with good

dc characteristics.

The AD612/AD614 contain precision thin-film resistor net-

tion the excellent tracking characteristics of the active laser-

trimmed thin-film resistors provide maximum gain drift of

:t10ppm/C

74dB min at unity gain (94dB min at G

PRODUCT DESCRIPTION

The AD612/AD614 are self-contained, high accuracy, high

speed hybrid instrumentation

acquisition applications requiring speed and accuracy under

istics with good dynamic performance, while the AD614 (A

works that allows the user to set the gain in binary steps from

1 to 1024 VIV by strapping the appropriate gain pins. In addi-

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 which may result from its use. No license is granted by implica-

tion or otherwise under any patent or patent rights of Analog Devices.

Information

W DEVICES

Wide Gain Range: 1 to 1024 in Binary Steps

APPLICA TIONS

Precision Current Amplifiers

Preamplifier for Recorder Instrumentation

FEATURES

Internal Gain Setting Resistors

Settling Time: 30ps max to 0.01%, G = 128

low Gain Drift: :t10ppm max

low Offset Drift: :t1pV/oC max, RTI,

High CMR: 94dB min, G = 1024V!V

low level High Speed Data Acquisition Systems

Bridge Amplifiers for Resistance Transducers

low Gain Error: :to.02% max (AD612C)

G = 1024V!V (AD612C)

ANALOG

furnished by Analog Devices is believed to be accurate

max.

amplifiers designed for data

1024) in the highest

amplifier in multi-

(AD614A. B)

WideBandInstrumentation Amplifier

max, CMR of

Self-Contained HighPerformance

Figure 2 shows the interconnection

AD614 along with the recommended shielding and grounding

ground return path for amplifier bias currents must be pro-

vided either by direct connection (as shown) or by an implicit

grourid path having up to 1MS1resistance between signal

ground and amplifier common. For best performance, sensi-

Tel: 617/329-4700

714/842.1717

TECHNIQUES

techniques. Because the AD612/AD614 are direct coupled, a

tive input and gain setting terminals should be shielded from

noise sources especially at high gains. The AD612/ AD614

provide a guard terminal to drive the input cable shield at the

INTERCONNECTION DIAGRAM AND SHIELDING

Route 1 Industrial Park; P.O. Box 280; Norwood, Mass. 02062

West Coast

~~~~ (1

g~~N(2

Figure 1. Simplified Schematic

312/894-3300

Mid-West

16k

diagram for the AD612/

AD612/AD614

(continued on page 3)

TWX: 710/394.657-7

214/231-5094

Texas

Related parts for AD614

AD614 Summary of contents

Page 1

... High CMR, input protection, low noise and excellent tempera- ture stability make the AD612/AD614 an excellent choice for precise measurement and control in harsh industrial environ- ments. The high speed of the AD612/AD614 provide higher throughput rates in multichannel data acquisition systems. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use ...

Page 2

... Voltage, Operating Current, Quiescent TEMPERATURE RANGE Rated Performance Storage p'RTcE " '- (1--24) (25-99) (lOO's) 'Specifications same as AD612A. "Specifications same as AD614A. 'Recommend model 904, l1SV @ !SOmA. Specifications subject to change without notice. and @+25°C = :t15V, unless otherwisenoted) HIGH ACCURACY AD612A AD612B 1 to 1024VIV :!:10ppm/C max to ...

Page 3

... OPERATING INSTRUCTIONS T "",,~, Install AD612/AD614 as shown in the diagram of Figure 2. I- 0.6 [ 15.241 --I Gain setting, offset trim and use of reference and guard termi- nals are described below. Gain Setting: The AD612/AD614 operates at G pin strapping. For binary gains 2 thru 256, strap appropriate 241 + INPUT gain pin (3 thru 10) to the gain programming pin (1) ...

Page 4

... Warm-up response (see Figure 7 below) is quite 1024. fast as is expected from a high performance instrumentation amplifier. The AD612/AD614 are available in three offset voltage drift selections. Figure graph of the typical RTO offset voltage drift vs. gain for all versions. Common Mode Rejection: CMR is dependent on source im- pedance imbalance, signal frequency and amplifier gain ...

Page 5

... VIV. AD612/AD614 have two speed selections with the AD612A being the slower versions and the AD614A, B the faster versions. Settling times are specified to 0.01% for gains 1 and 128, and to 0.05% for gains 1,128 and 1024. Figure 16 shows typical settling times vs ...

Page 6

... Siliconix E105 are recommended. JL Figure 19. Programmable BIPOTENTIAL AMPLIFIER Figure 20 shows the AD612/AD614 being used to amplify a weak electrical signal of biologic origin. The input impedance (l09 QII3pF) minimizes loading of the signal being measured. The guard terminal drives the input cable shield thereby mini- mizing common-mode errors due to cable to shield capacitance interacting with the unbalanced electrode impedance ...

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