AMP04ESZ Analog Devices Inc, AMP04ESZ Datasheet - Page 7
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AMP04ESZ
Manufacturer Part Number
AMP04ESZ
Description
IC AMP INST PREC 30MA LP 8SOIC
Manufacturer
Analog Devices Inc
Type
Instrumentation Ampr
Datasheet
1.AMP04FSZ.pdf
(16 pages)
Specifications of AMP04ESZ
Amplifier Type
Instrumentation
Number Of Circuits
1
-3db Bandwidth
700kHz
Current - Input Bias
22nA
Voltage - Input Offset
30µV
Current - Supply
750µA
Current - Output / Channel
30mA
Voltage - Supply, Single/dual (±)
5 V ~ 30 V, ±2.5 V ~ 15 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Number Of Channels
1
Number Of Elements
2
Power Supply Requirement
Single/Dual
Common Mode Rejection Ratio
90dB
Voltage Gain Db
60dB
Input Resistance
4000@5VMohm
Input Offset Voltage
0.15@5VmV
Input Bias Current
0.03@5VnA
Single Supply Voltage (typ)
9/12/15/18/24/28V
Dual Supply Voltage (typ)
±3/±5/±9/±12V
Power Supply Rejection Ratio
105dB
Rail/rail I/o Type
No
Single Supply Voltage (min)
5V
Single Supply Voltage (max)
30V
Dual Supply Voltage (min)
±2.5V
Dual Supply Voltage (max)
±15V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC
No. Of Amplifiers
2
Bandwidth
700kHz
Amplifier Output
Single Ended
Cmrr
85dB
Supply Voltage Range
± 2.5V To ± 15V
Supply Current
750µA
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Slew Rate
-
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AMP04ESZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Company:
Part Number:
AMP04ESZ-R7
Manufacturer:
MP
Quantity:
213
Programming the Gain
The gain of the AMP04 is programmed by the user by selecting
a single external resistor—R
The output voltage is then defined as the differential input
voltage times the gain.
In single supply systems, offsetting the ground is often desired
for several reasons. Ground may be offset from zero to provide
a quieter signal reference point, or to offset “zero” to allow a
unipolar signal range to represent both positive and negative
values.
In noisy environments such as those having digital switching,
switching power supplies or externally generated noise, ground
may not be the ideal place to reference a signal in a high accu-
racy system.
Often, real world signals such as temperature or pressure may
generate voltages that are represented by changes in polarity. In
a single supply system the signal input cannot be allowed to go
below ground, and therefore the signal must be offset to accom-
modate this change in polarity. On the AMP04, a reference
input pin is provided to allow offsetting of the input range.
The gain equation is more accurately represented by including
this reference input.
Grounding
The most common problems encountered in high performance
analog instrumentation and data acquisition system designs are
found in the management of offset errors and ground noise.
Primarily, the designer must consider temperature differentials
and thermocouple effects due to dissimilar metals, IR volt-
age drops, and the effects of stray capacitance. The problem
is greatly compounded when high speed digital circuitry, such
as that accompanying data conversion components, is brought
into the proximity of the analog section. Considerable noise and
error contributions such as fast-moving logic signals that easily
propagate into sensitive analog lines, and the unavoidable noise
common to digital supply lines must all be dealt with if the accu-
racy of the carefully designed analog section is to be preserved.
Besides the temperature drift errors encountered in the ampli-
fier, thermal errors due to the supporting discrete components
should be evaluated. The use of high quality, low-TC compo-
nents where appropriate is encouraged. What is more important,
large thermal gradients can create not only unexpected changes
in component values, but also generate significant thermoelec-
tric voltages due to the interface between dissimilar metals such
as lead solder, copper wire, gold socket contacts, Kovar lead
frames, etc. Thermocouple voltages developed at these junctions
commonly exceed the TCV
Component layout that takes into account the power dissipation
at critical locations in the circuit and minimizes gradient effects
and differential common-mode voltages by taking advantage of
input symmetry will minimize many of these errors.
V
OUT
V
OUT
= (V
Gain = 100 kΩ/R
= (V
IN+
GAIN
– V
IN+
OS
IN–
contribution of the AMP04.
– V
:
) × Gain + V
IN–
) × Gain
GAIN
REF
High accuracy circuitry can experience considerable error con-
tributions due to the coupling of stray voltages into sensitive
areas, including high impedance amplifier inputs which benefit
from such techniques as ground planes, guard rings, and shields.
Careful circuit layout, including good grounding and signal
routing practice to minimize stray coupling and ground loops is
recommended. Leakage currents can be minimized by using
high quality socket and circuit board materials, and by carefully
cleaning and coating complete board assemblies.
As mentioned above, the high speed transition noise found in
logic circuitry is the sworn enemy of the analog circuit designer.
Great care must be taken to maintain separation between them
to minimize coupling. A major path for these error voltages will
be found in the power supply lines. Low impedance, load related
variations and noise levels that are completely acceptable in the
high thresholds of the digital domain make the digital supply
unusable in nearly all high performance analog applications.
The user is encouraged to maintain separate power and ground
between the analog and digital systems wherever possible,
joining only at the supply itself if necessary, and to observe
careful grounding layout and bypass capacitor scheduling in
sensitive areas.
Input Shield Drivers
High impedance sources and long cable runs from remote trans-
ducers in noisy industrial environments commonly experience
significant amounts of noise coupled to the inputs. Both stray
capacitance errors and noise coupling from external sources can
be minimized by running the input signal through shielded
cable. The cable shield is often grounded at the analog input
common, however improved dynamic noise rejection and a
reduction in effective cable capacitance is achieved by driving
the shield with a buffer amplifier at a potential equal to the
voltage seen at the input. Driven shields are easily realized with
the AMP04. Examination of the simplified schematic shows that
the potentials at the gain set resistor pins of the AMP04 follow
the inputs precisely. As shown in Figure 5, shield drivers are
easily realized by buffering the potential at these pins by a dual,
single supply op amp such as the OP213. Alternatively, applica-
tions with single-ended sources or that use twisted-pair cable
could drive a single shield. To minimize error contributions due
to this additional circuitry, all components and wiring should
remain in proximity to the AMP04 and careful grounding and
bypassing techniques should be observed.
1/2 OP213
1/2 OP213
AMP04
V
OUT