40V Precision Instrumentation Amplifier with
Differential ADC Driver
ISL28617
The ISL28617 is a high performance, differential input, differential
output instrumentation amplifier designed for precision
analog-to-digital applications. It can operate over a supply range of 8V
(±4V) to 40V (±20V) and features a differential input voltage range
up to ±34V. The output stage has rail-to-rail output drive capability
optimized for differential ADC driver applications. Its versatility and
small package makes it suitable for a variety of general purpose
applications. Additional features not found in other instrumentation
amplifiers enable high levels of DC precision and excellent AC
performance.
The gain of the ISL28617 can be programmed from 0.1 to
10,000 via two external resistors, R
IN
and R
FB
. The gain accuracy
is determined by the matching of R
IN
and R
FB
. The gain resistors
have Kelvin sensing, which removes gain error due to PC trace
resistance. The input and output stages have individual power
supply pins, which enable input signals riding on a high common
mode voltage to be level shifted to a low voltage device, such as
an A/D converter. The rail-to-rail output stage can be powered
from the same supplies as the ADC, which preserves the ADC
maximum input dynamic range and eliminates ADC input
overdrive.
The ISL28617 is offered in the 24 Ld TSSOP package, and is
guaranteed over -40°C to +125°C operation.
Features
• Rail-to-rail differential output ADC driver
• High voltage interface to low voltage circuits
• Wide operating voltage range . . . . . . . . . . . . . . . ±4V to ±20V
• Low input offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30µV
• Excellent CMRR and PSRR . . . . . . . . . . . . . . . . . . . . . . . 120dB
• Closed loop -3dB BW . . .0.3MHz (A
V
= 1k) to 5MHz (A
V
= 0.1)
• Operating temperature range. . . . . . . . . . . .-40°C to +125°C
• Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Ld TSSOP
Applications
• Precision test and measurement
• High voltage industrial process control
• Signal conditioning amplifier for remote powered sensors
• Weigh scales
• ECG and biomedical sense amplifiers
140
120
100
CMRR (dB)
80
60
40
20
0
A
V
= 1000
A
V
= 100
A
V
= 10
A
V
= 1
A
V
= 0.1
1
10
100
1k
10k
100k
1M
Related Literature
•
AN1753,
“ISL28617VYXXEV1Z User’s Guide” Evaluation board
with bulk metal foil resistors for high precision. See application
note for gain options and ordering information.
•
AN1748,
“ISL28617SMXXEV1Z User’s Guide” Evaluation board
with standard resistors for low cost, medium precision. See
application note for gain options and ordering information.
FREQUENCY(Hz)
FIGURE 1. CMRR R
F
= 121k
FULL BRIDGE STRAIN GAUGE AMPLIFIER AND DIFFERENTIAL ADC DRIVER
+5V
TO
+20V
BRIDGE
EXCITATION
-5V
TO
-20V
R
IN
IN+
V
CC
+R
IN
SENSE
+R
IN
-R
IN
-R
IN
SENSE
+R
FB
+R
FB
SENSE
V
CO
+V
FB
R
+V
OUT
+IN
C
-IN
ISL28617
V
CMO
V
DD
A-D
CONVERTER
ISL26132
V
REF
GND
+5V
R
FB
-V
FB
-V
OUT
V
EO
-R
FB
SENSE GND
-R
FB
V
EE
R
IN-
V
REF
ISL21090
AV = R
FB
/R
IN
RANGE FROM 0.1 TO 10,000
FIGURE 2. BASIC APPLICATION CIRCUIT
October 17, 2013
FN6562.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Copyright Intersil Americas LLC 2012, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL28617
ISL28617
(24 LD TSSOP)
TOP VIEW
NC
1
DNC
2
DNC
3
+R
FB
4
+R
FB
SENSE
5
-R
FB
SENSE
6
-R
FB
7
GND
8
V
CC
9
V
CO
10
+V
FB
11
+V
OUT
12
24
IN+
23
IN-
22
DNC
21
+R
IN
20
+R
IN
SENSE
19
-R
IN
SENSE
18
-R
IN
17
V
CMO
16
V
EE
15
V
EO
14
-V
FB
13
-V
OUT
Pin Descriptions
PIN
NAME
NC
DNC
+R
FB
+R
FB
SENSE
PIN NUMBERS
1
2, 3, 22
4
5
DESCRIPTION
No Internal Connection.
For internal use; Do Not Connect.
Feedback Resistor, R
FB
+ pin.
+R
FB
, Positive Sense pin connects to the
resistor R
FB
+ terminal to form the R
FB
+
Kelvin connection.
-R
FB
, Negative Sense pin connects to the
resistor R
FB
- terminal to form the R
FB
-
Kelvin connection.
Feedback Resistor, Negative Terminal.
Ground Pin is capacitively coupled to the
internal ESD circuit and should be
connected to power supply common or
signal GND.
Positive Supply for Input Stage and
Feedback Amp.
Positive Supply for Output Stage.
Positive Output Feedback.
Positive Output.
Negative Output.
Negative Output Feedback.
Negative Supply for Output Stage.
Negative Supply for Input Stage and
Feedback Amp.
Output Common Mode Reference input.
Input Resistor, Negative Terminal.
-R
IN
, Negative Sense pin connects to the
resistor R
IN
- terminal to form the R
IN
-
Kelvin connection.
+R
IN
, Positive Sense pin connects to the
resistor R
IN
+ terminal to form the R
IN
+
Kelvin connection.
Input Resistor, Positive Terminal.
Negative Input.
Positive Input.
-R
FB
SENSE
6
-R
FB
GND
7
8
V
CC
V
CO
+V
FB
+V
OUT
-V
OUT
-V
FB
V
EO
V
EE
V
CMO
-R
IN
-R
IN
SENSE
9
10
11
12
13
14
15
16
17
18
19
+R
IN
SENSE
20
+R
IN
IN-
IN+
21
23
24
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL28617FVZ
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-
free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL28617.
For more information on MSL please see tech brief
TB363.
PART
MARKING
28617 FVZ
TEMP RANGE
(°C)
-40 to +125
24 Ld TSSOP
PACKAGE
(Pb-Free)
PKG.
DWG. #
M24.173
2
FN6562.1
October 17, 2013
ISL28617
Simplified Block Diagram
+15V
IN+
IN+
+R
IN
SENSE
+R
IN
V
CC
V
CC
ISL28617
V
CO
R
IN
-R
IN
-R
IN
SENSE
V
EE
+V
OUT
R
L
-OUT
+OUT
IN-
IN-
+V
FB
+R
FB
SENSE
+R
FB
R
FB
-R
FB
-R
FB
SENSE
-V
FB
V
EE
V
EE
GND
V
EO
V
CC
-V
OUT
V
CMO
-15V
GND
3
FN6562.1
October 17, 2013
ISL28617
Absolute Maximum Ratings
Maximum Supply Voltage (V
CC
to V
EE
or GND) . . . . . . . . . . . . . . . . . . . . 42V
Maximum Supply Voltage (V
CO
to V
EO
or GND) . . . . . . . . . . . . . . . . . . . . 42V
Maximum Voltage (V
CO
to V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.5V, -40V
Maximum Voltage (V
EO
to V-) . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V, +40V
Maximum Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA
Max/Min Input Current for Input Voltage >V
CC
or <V
EE
. . . . . . . . . . . . . ±10mA
Maximum Input Current (±R
IN
, ±R
FB
, ±R
IN
SENSE, ±R
FB
SENSE) . . . .±5mA
Maximum Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Min/Max Input Voltage . . . . . . . . . . . . . . . . . . . . .(V
EE
- 0.5V) to (V
CC
+0.5V)
Output Short-Circuit Duration (1 Output at a Time) . . . . . . . . . . . . . Continuous
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
θ
JC
(°C/W)
24 Ld TSSOP (Notes 4, 5) . . . . . . . . . . . . . .
74
28
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Maximum Junction Temperature (T
JMAX
). . . . . . . . . . . . . . . . . . . . . .+150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range (T
A
) . . . . . . . . . . . . . . . . . . .-40°C to +125°C
V
CC
, V
EE
Operating Voltage Range . . . . . . . . . . . . . . . . . . . . . . . ±4V to ±20V
V
CO
, V
E+
Operating Voltage Range . . . . . . . . . . . . . . . . . . . . . ±1.5V to ±20V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTE:
4.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
5. For
θ
JC
, the “case temp” location is taken at the package top center.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted,
all tests are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
V
CC
=
V
CO
= 15V, V
EE
=
V
EO
= -15V, V
CM
= 0V, R
L
= 10kΩ, R
FB
= R
IN
= 30.1kΩ, T
A
= +25°C, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +125°C.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
Electrical Specifications
INPUT DC SPECIFICATIONS
V
CMIR
IN
V
OS
IN
IN+, IN- Common Mode Input Voltage Range
Input Offset Voltage
V
EE
+3V
-100
-275
TCV
OS
IN
I
B
IN
Input Offset Voltage Temperature Coefficient
Input Bias Current
-2.75
-1
-1.3
I
OS
IN
Input Offset Current
-0.75
-1
I
RIN
R
IN
CM
CMRR
Input Resistor Drive Current
Common Mode Input Resistance
Common Mode Rejection Ratio
V
EE
+3V < V
CM
< V
CC
-3V
G=1
V
EE
+3V < V
CM
< V
CC
-3V
G = 100
110
107
130
110
150
(Note 7)
87
102
80
120
±0.2
±0.3
±0.2
±30
V
CC
-3V
100
275
2.75
1
1.3
0.75
1
117
V
µV
µV
µV/°C
nA
nA
nA
nA
µA
GΩ
dB
dB
dB
dB
FEEDBACK DC SPECIFICATIONS
V
CMIR
FB
V
OS
FB
+FB, -FB Common Mode Input Voltage Range
Feedback Input Offset Voltage
V
EE
+3V
-1600
-3000
I
B
V
FB+,-
Input Bias Current at V
FB
± Inputs
15
±400
V
CC
-3V
1600
3000
V
µV
µV
nA
4
FN6562.1
October 17, 2013
ISL28617
V
CC
=
V
CO
= 15V, V
EE
=
V
EO
= -15V, V
CM
= 0V, R
L
= 10kΩ, R
FB
= R
IN
= 30.1kΩ, T
A
= +25°C, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +125°C.
(Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
Electrical Specifications
OUTPUT DC SPECIFICATIONS
V
OL
Output Voltage Low, V
OUT
to V
-
V
CC
= +15V, V
EE
= -15V,
V
CO
= +4V, V
EO
= -4V
R
IN
= R
F
= 121kΩ, I
OUT
= 1.5mA
V
CC
= +15V, V
EE
= -15V,
V
CO
= +4V, V
EO
= -4V
R
IN
= R
F
= 121kΩ, I
OUT
= 1.5mA
R
L
= 0Ω to GND
-20
I
ERR
Total Internal Offset Error Current (Note 8)
-17
-90
E
G
Gain Error (Notes 9, 10)
V
OUT
= -10V to +10V, R
F
= 121kΩ
G=1
G = 100
V
OUT
= -2.5V to +2.5V, R
F
= 30.1kΩ
G=1
±0.0005
%
±0.003
±0.004
%
%
±5
150
200
200
150
200
200
±45
20
17
90
mV
mV
mV
mV
mA
mA
nA
nA
V
OH
Output Voltage High, V
+
to V
OUT
I
SC
Output Short Circuit Current
OUTPUT COMMON MODE SPECIFICATIONS
V
CMO
CMIR
V
OS
CM
Output Common Mode Control Input Voltage
Range
Output Common Mode Offset Voltage from
V
CMO
Input
Input Bias Current at V
CMO
Input
V
EE
+3V
-1.3
-4.75
-0.6
-1.75
±0.2
±0.5
V
CC
-3V
1.3
4.75
0.6
1.75
V
mV
mV
µA
µA
I
B
V
CMO
POWER SUPPLY SPECIFICATIONS
I
CC
Supply Current, V
CC
to V
EE
R
L
= OPEN
2.05
2.2
2.85
I
CO
Supply Current, V
CO
to V
EO
R
L
= OPEN
2.25
2.6
2.85
V
CC
to V
EE
Input Supply Voltage
Dual Supply
Single Supply
V
CO
to V
EO
Output Supply Voltage
Dual Supply
Single Supply
PSRR V
CC
to V
EE
Power Supply Rejection Ratio
V
CC
to V
EE
= ±4V to ±20V
G = 100
PSRR V
CO
to V
EO
Power Supply Rejection Ratio
V
CO
to V
EO
= ±4V to ±20V
±4
8
±1.5
3
123
118
110
110
120
130
±20
40
±20
40
mA
mA
mA
mA
V
V
V
V
dB
dB
dB
dB
AC SPECIFICATIONS
e
N
e
N
rms
i
N
Input Noise Voltage Density
Input rms Noise Voltage
Input Noise Current Density
f = 1kHz
f = 0.1 to 10Hz
f = 1kHz
8.6
85
150
nV/√Hz
nVrms
fA/√Hz
5
FN6562.1
October 17, 2013
stm32/stm8
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