AD614_15 Datasheet, PDF (1/6 Pages) Analog Devices – Self-Contained HighPerformance

ANALOG
Self-ContaineHdighPerformance
W DEVICES _{WideBandInstrumentatioAnmplifier}
FEA TURES
Internal Gain Setting Resistors
Wide Gain Range: 1 to 1024 in Binary Steps
Settling Time: 30ps max to 0.01%, G = 128 (AD614A. B)
low Gain Error: :to.02% max (AD612C)
low Gain Drift: :t10ppm max
low Offset Drift: :t1pV/oC max, RTI,
G = 1024V!V (AD612C)
OBSOLETE HighCMR: 94dB min, G=1024V!V
APPLICA TIONS
low level High Speed Data Acquisition Systems
Bridge Amplifiers for Resistance Transducers
Precision Current Amplifiers
Preamplifier for Recorder Instrumentation
PRODUCT DESCRIPTION
The AD612/AD614 are self-contained, high accuracy, high
speed hybrid instrumentation amplifiers designed for data
acquisition applications requiring speed and accuracy under
worst-case operating conditions. Three versions (A, B, C) of
the AD612 are available which provide superior dc character-
istics with good dynamic performance, while the AD614 (A
& B) versions provide superior dynamic performance with good
INTERCONNECTION DIAGRAM AND SHIELDING
TECHNIQUES
Figure 2 shows the interconnection diagram for the AD612/
AD614 along with the recommended shielding and grounding
techniques. Because the AD612/AD614 are direct coupled, a
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
dc characteristics.
ground and amplifier common. For best performance, sensi-
The AD612/AD614 contain precision thin-film resistor net-
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-
tion the excellent tracking characteristics of the active laser-
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
(continued on page 3)
trimmed thin-film resistors provide maximum gain drift of
:t10ppm/C max.
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 max, CMR of
74dB min at unity gain (94dB min at G = 1024) in the highest
~~~~ (1
AD612/AD614
16k
accuracy version (AD612C) or 160kHz small signal bandwidth
and settling time to 0.01 % of 30ps max in the high speed
version (AD614A or B).
g~~N(2
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 amplifier in multi-
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-
ments. The high speed of the AD612/AD614 provide higher
throughput rates in multichannel data acquisition systems.
Figure 1. Simplified Schematic
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 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.
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