DATASHEET
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.
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)
A
V
= 1000
A
V
= 100
A
V
= 10
A
V
= 1
Related Literature
•
AN1753,
“ISL28617VYXXEV1Z User’s Guide” Evaluation board
with bulk metal foil resistors for high precision.
•
AN1748,
“ISL28617SMXXEV1Z User’s Guide” Evaluation board
with standard resistors for low cost, medium precision.
80
60
40
20
A
V
= 0.1
0
1
10
100
1k
10k
100k
1M
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
V
CO
+V
FB
R
+V
OUT
+IN
C
-IN
R
FB
+R
FB
+R
FB
SENSE
ISL28617
V
CMO
V
DD
A-D
CONVERTER
ISL26132
V
REF
GND
+5V
-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
May 27, 2015
FN6562.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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|
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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 NUMBER
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
PACKAGE
(RoHS Compliant)
24 Ld TSSOP
PKG.
DWG. #
M24.173
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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
FIGURE 3. SIMPLIFIED BLOCK DIAGRAM
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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)
JA
(°C/W)
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
TB493
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
EO
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.
NOTES:
4.
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
JC
, the “case temp” location is taken at the package top center.
V
CC
=
V
CO
= 15V, V
EE
=
V
EO
= -15V, V
CM
= 0V, R
L
= 10kΩR
FB
= R
IN
= 30.1kΩT
A
= +25°C, unless otherwise
specified. Boldface limits apply across the operating temperature range, -40°C to +125°C.
PARAMETER
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
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
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
DESCRIPTION
TEST 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
= 121kΩI
OUT
= 1.5mA
150
200
200
mV
mV
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ISL28617
V
CC
=
V
CO
= 15V, V
EE
=
V
EO
= -15V, V
CM
= 0V, R
L
= 10kΩR
FB
= R
IN
= 30.1kΩT
A
= +25°C, unless otherwise
specified. Boldface limits apply across the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
V
OH
DESCRIPTION
Output Voltage High, V
+
to V
OUT
TEST CONDITIONS
V
CC
= +15V, V
EE
= -15V,
V
CO
= +4V, V
EO
= -4V
R
IN
= R
F
= 121kΩI
OUT
= 1.5mA
R
L
= 0Ωto 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
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
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
AC SPECIFICATIONS
e
N
e
N
rms
i
N
i
N
IERR
i
N
IERR rms
Input Noise Voltage Density
Input rms Noise Voltage
Input Noise Current Density
Total Internal Noise Current Density
0.1 to 10Hz Total Internal rms Noise Current
f = 1kHz
f = 0.1 to 10Hz
f = 1kHz
f = 1kHz
f = 0.1 to 10Hz
8.6
85
150
2.6
4
nV/√Hz
nVrms
fA/√Hz
pA/√Hz
pArms
120
130
dB
dB
dB
±20
40
±20
40
mA
mA
mA
mA
V
V
V
V
dB
±0.2
±0.5
V
CC
-3V
1.3
4.75
0.6
1.75
V
mV
mV
µA
µA
±0.003
±0.004
±0.0005
±5
MIN
(Note
6)
TYP
150
MAX
(Note
6)
200
200
±45
20
17
90
UNIT
mV
mV
mA
mA
nA
nA
%
%
%
Electrical Specifications
I
SC
Output Short-circuit Current
I
B
V
CMO
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