USER’S MANUAL
ISL2827xINEVAL1Z
Evaluation Board
AN1290
Rev 2.00
June 15, 2009
VSM
GND
VSP
Introduction
The ISL2827xINEVAL1Z evaluation board is a design
platform containing all the circuitry needed to characterize
critical performance parameters of the ISL28270, ISL28271,
ISL28272 or ISL28273 Dual Instrumentation Amplifiers using
a variety of user defined test circuits.
The ISL2827x series of amplifiers are dual channel
instrumentation amplifiers optimized for 2.4V to 5V single
supplies. These devices feature an Input Range
Enhancement Circuit (IREC) which enables the inputs to
swing to the rails. The ISL28270 and ISL28273 maintain
CMRR performance from the positive rail down to within
50mV of the negative rail. The ISL28271 and ISL28272 can
swing 100mV beyond the rails. The output operation of all
devices is rail-to-rail. The ISL28270 and ISL28272 are
compensated for a minimum gain of 100 and the ISL28271
and ISL28273 are compensated for a minimum gain of 10.
1
1
2
C
3
R
32
1
0
D
2
1
1 A
2 NC
D
3
2
D
1
1
R
33
C
4
10µF
0
2
1
VP
C
5
2
C 3
2
1
1
0.1µF
VM
0.1µF
FIGURE 1. POWER SUPPLY CIRCUIT
Power Supplies (Refer to Figure 1)
External power connections are made through the VSP (+V),
VSM (-V) and GND connections on the evaluation board.
For single supply operation, the VSM (-V) and GND pins are
tied together to the power supply negative terminal. For split
supplies, VSP (+V) and VSM (-V) terminals connect to their
respective power supply terminals. Resistors R
32
and R
33
are 0 but can be changed by the user to provide power
supply filtering, or to reduce the voltage rate-of-rise to less
than ±1V/µs. Anti-reverse diodes D
1
and D
2
protect the
circuit in the case of accidental polarity reversal.
Reference Documents
• ISL28270, ISL28273 Data Sheet, FN6260
• ISL28271, ISL28272 Data Sheet, FN6390
Evaluation Board Key Features
The ISL2827xINEVAL1Z is designed to be operated from a
single supply (+2.4VDC to +5VDC), or from split supplies
(±1.2VDC to ±2/5V). The board is configured for 2
independent instrumentation amplifiers connected for a
closed loop gain of 101 (ISL28270, ISL28272) or a gain of
10 (ISL28271, ISL28273) with inverting and non-inverting
high impedance terminated with 100k resistors to ground.
Each amplifier contains it’s own VREF input to establish an
input common mode reference. An ENABLE select switch is
provided for each amplifier to be used to save power by
powering the device down.
Amplifier Configuration (Refer to Figure 2)
The schematic of each of the two op amps with the
components supplied is shown in Figure 2. The circuit
implements a differential input instrumentation amp with a
closed loop gain of 101 for the ISL28270 and ISL28272, and
10 for the ISL28271, ISL28273. The circuit can operate from
a single 2.4VDC to +5VDC supply, or from dual supplies
from ±1.2VDC to ±2.5VDC.The output common mode
reference is applied to the VREF pin, and has a range from
ground (VM) to VP.
VP
IN+(x)
IN+
IN+
IN-
IN-
IN-(x)
VCM
100k
VREF(x)
R
G
1k
GND
R
F
100k
FB+
FB-
+
-
+
-
ENABLE
1/2 ISL28270, ISL28271, ISL28272, ISL28273
0
-V
VOUT(x)
10k
VM
VREF
100k (ISL28270, ISL28272)
9.09k (ISL28271, ISL28273)
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
AN1290 Rev 2.00
June 15, 2009
Page 1 of 5
ISL2827xINEVAL1Z
User-selectable Options (Refer to Figure 3)
Component pads are included to enable a variety of user
selectable circuits to be added to the amplifier differential
inputs, the VREF input, and the amplifier feedback loop. A
voltage divider and filter option can be added to establish a
power supply tracking common mode reference at the VREF
input, or a coaxial connection to the amplifier FB+ pin can be
made at the FB+ BNC connector. The differential inputs have
additional resistor placements for adding input attenuation,
or to establish input DC offsets through the VREF pin.
FB+A
V-
R
6
DNP
VREFA
J
4
1
R
5
DNP
VREFA
OPEN
V+
C
3
J
8
R
13
DNP
R
14
0
VREFA
R
20
100k
R
15
DNP
R
17
1k
R
16
DNP
-INA
J
9
R
18
0
R
19
DNP
R
21
0
R
22
DNP
J
10
+INA
R
23
100k
FIGURE 3. COMPONENT-SELECTABLE OPTIONS
ISL2827xINEVAL1Z Components Parts List
DEVICE #
C
3
, C
5
C
FA
, C
FB
, C
LA
, C
LB
C
1
, C
2
C
4
D
1
, D
2
U
1
DESCRIPTION
CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS
CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS
CAP, SMD, 1206, 1µF, 25V, 10%, X7R, ROHS
CAP-TANTALUM, SMD, D, 10µF, 35V, 10%, LOW ESR,
ROHS
DIODE-RECTIFIER, SMD, MELF, 2 Ld, 50V, 1A, GPP,
ROHS
ISL28270FAZ or ISL28271FAZ or ISL28272FAZ or
ISL28273FAZ INSTRUMENTATION AMP,16P, QSOP,
ROHS
0 User Selectable Resistors
R
I
Gain Resistors
ENABLE Pull-up Resistors
COMMENTS
Power Supply Decoupling
Optional Amplifier Feedback Caps
Not Populated
Power Supply Decoupling
Optional VREF Filter
Not Populated
Reverse Power Protection
R
32
, R
33
, R
IN+A
, R
IN+B
, R
IN-A
, R
IN-B
, R
SA
, R
SB
RES, SMD, 0805, 0, 1/8W, TF, ROHS
R
IA
, R
IB
.
R
1
, R
2
R
15
to R
18
R
9
, R
12
, R
20
, R
22
, R
27
, R
29
R
FA
, R
FB
(ISL28271, ISL28273)
R
FA
, R
FB
(ISL28270, ISL28272)
RES, SMD, 0805, 1k, 1/8W, 1%,TF, ROHS
RES, SMD, 0805, 10k, 1/8W, 1%,TF, ROHS
RES, SMD, 0805, 100k, 1/10W, 1%, TF, ROHS
CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS
RES, SMD, 0805, 9.09k, 1/8W, 1%, TF, ROHS
RES, SMD, 0805, 100k, 1/8W, 1%, TF, ROHS
User Selectable Resistors
Not Populated
R
F
Gain Resistors - ISL28271,
ISL28272
R
F
Gain Resistors - ISL28270
User Selectable Resistors
Not Populated
Enable/Disable Select Switches
R
3
, R
6
, R
10
, R
11
, R
13
, R
14
, R
19
, R
21
, R
23
, R
25
, RES, SMD, 0805, DNP-PLACE HOLDER, ROHS
R
28
, R
30
, R
LA
, R
LB
, R
X
.
S
1
, S
2
SWITCH-SEALED MINI TOGGLE, TH, 3P, SP,
ON/NONE/ON, GOLD
AN1290 Rev 2.00
June 15, 2009
Page 2 of 5
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