intersil EL8170, EL8173 DATA SHEET

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EL8170, EL8173

Data Sheet January 3, 2006

Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifiers

The EL8170 and EL8173 are micropower instrumentation
amplifiers optimized for operation at 2.9V to 5V single
supplies. Inputs and outputs can operate rail-to-rail. As with
all instrumentation amplifiers, a pair of inputs provide very
high common-mode rejection and are completely
independent from a pair of feedback terminals. The
feedback terminals allow zero input to be translated to any
output offset, including ground. A feedback divider controls
the overall gain of the amplifier.

The EL8170 is compensated for a gain of 100 or more, and
the EL8173 is compensated for a gain of 10 or more. The
EL8170 and EL8173 have bipolar input devices for best
offset and 1/f noise performance.

The amplifiers can be operated from one lithium cell or two
Ni-Cd batteries. The EL8170 and EL8173 input range
includes ground to slightly above positive rail. The output
stage swings to ground and positive supply - no pull-up or
pull-down resistors are needed.

Pinout

EL8170, EL8173

(8 LD SO)

TOP VIEW

ENABLE

IN-

IN+

1

2

+

3

+

8

FB+

-

-

7

Σ

VS+

OUT

6

FN7490.0

Features

• 78µA maximum supply current

• Maximum offset voltage

- 250µV (EL8170)

- 1000µV (EL8173)

• 500pA input bias current

• 2µV/°C offset voltage drift

• 396kHz -3dB bandwidth (G = 10)

• 192kHz -3dB bandwidth (G = 100)

• 0.5V/µs slew rate

• Single supply operation

- Input voltage range is rail-to-rail

- Output swings rail-to-rail

• Output sources and sinks ±29mA load current

• 0.2% gain error

• Pb-free plus anneal available (RoHS compliant)

Applications

• Battery- or solar-powered systems

• Strain gauges

• Current monitors

• Thermocouple amplifiers

VS-

4

1

5

FB-

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

Copyright © Intersil Americas Inc. 2006. All Rights Reserved.

Ordering Information

EL8170, EL8173

PAR T

PART NUMBER

EL8170IS 8170IS - 8 Ld SO MDP0027 EL8173IS 8173IS - 8 Ld SO MDP0027

EL8170IS-T7 8170IS 7” 8 Ld SO MDP0027 EL8173IS-T7 8173IS 7” 8 Ld SO MDP0027

EL8170IS-T13 8170IS 13” 8 Ld SO MDP0027 EL8173IS-T13 8173IS 13” 8 Ld SO MDP0027

EL8170ISZ
(See Note)

EL8170ISZ-T7
(See Note)

EL8170ISZ-T13
(See Note)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are 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.

MARKING

8170ISZ - 8 Ld SO

8170ISZ 7” 8 Ld SO

8170ISZ 13” 8 Ld SO

TAPE &

REEL PACKAGE

(Pb-free)

(Pb-free)

(Pb-free)

PKG.

DWG. # PART NUMBER

MDP0027 EL8173ISZ

(See Note)

MDP0027 EL8173ISZ-T7

(See Note)

MDP0027 EL8173ISZ-T13

(See Note)

PART

MARKING

8173ISZ - 8 Ld SO

8173ISZ 7” 8 Ld SO

8173ISZ 13” 8 Ld SO

TAPE &

REEL PACKAGE

(Pb-free)

(Pb-free)

(Pb-free)

PKG.

DWG. #

MDP0027

MDP0027

MDP0027

Pin Description

EL8170/EL8173 PIN NAME PIN FUNCTION

1ENABLE

2 IN- Inverting (IN-) and non-inverting (IN+) high impedance input terminals.

3IN+

4 VS- Negative supply terminal.

5 FB- High impedance feedback terminals. The feedback terminals have a very similar equivalent

8FB+

7 VS+ Positive supply terminal.

6 VOUT Output Voltage.

Active Low. When pulled up above 2V, the in-amp conserves 3µA disabled supply current and
the output is in a high impedance state. An internal pull down defines the ENABLE
left floating.

circuit as the input terminals. They also have an Input Bias Compensation/Cancelling Circuit.
The negative feedback (FB-) pin connects to an external resistive network to set the gain of
the in-amp. The positive feedback (FB+) can be used to shift the DC level of the output or as
an output offset.

low when

2

FN7490.0

January 3, 2006

EL8170, EL8173

Absolute Maximum Ratings (T

Supply Voltage, V

Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5V

V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5V, VS+ + 0.5V

EN

ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V

S

Electrical Specifications V

= 25°C)

A

Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite

Ambient Operating Temperature . . . . . . . . . . . . . . . . -40°C to +85°C

Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

= TC = T

J

+ = +5V, VS- = GND, VCM = 1/2VS+, TA = 25°C, unless otherwise specified.

S

A

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

OS

Input Offset Voltage EL8170 100 250 µV

EL8173 400 1000 µV

TCV

OS

Input Offset Voltage Temperature

Temperature = -40°C to 85°C 2 µV/°C

Coefficient

I

OS

I

B

Input Offset Current between IN+, and
IN- and between FB+ and FB-

Input Bias Current (IN+, IN-, FB+, and

0.5 2 nA

0.5 2 nA

FB- terminals)

e

N

Input Noise Voltage EL8170 f = 0.1Hz to 10Hz 2 µV

EL8173 10 µV

P-P

P-P

Input Noise Voltage Density fo = 1kHz 50 nV/√Hz

R

IN

Input Resistance EL8170 8 MΩ

EL8173 14 MΩ

V

IN

Input Voltage Range Guaranteed by CMRR test 0 5 V

CMRR Common Mode Rejection Ratio EL8170 VCM = 0V to +5V 80 108 dB

EL8173 80 104 dB

PSRR Power Supply Rejection Ratio EL8170 V

= 2.9V to 5V 80 104 dB

S

EL8173 70 90 dB

E

G

Gain Error EL8170 RL = 100kΩ to 2.5V -1.5 +0.3 +1.5 %

EL8173 -0.8 +0.2 +0.8 %

V

OUT

Maximum Voltage Swing Output low, 100kΩ to 2.5V 0 4 10 mV

Output low, 1kΩ to 2.5V 0.13 0.25 V

Output high, 100kΩ to 2.5V 4.990 4.996 V

Output high, 1kΩ to GND 4.75 4.88 V

SR Slew Rate R

= 1kΩ to GND 0.3 0.5 0.7 V/µs

L

3

FN7490.0

January 3, 2006

EL8170, EL8173

Electrical Specifications V

+ = +5V, VS- = GND, VCM = 1/2VS+, TA = 25°C, unless otherwise specified. (Continued)

S

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

-3dB BW -3dB Bandwidth EL8170 Gain = 100V/V 192 kHz

Gain = 200 93 kHz

Gain = 500 30 kHz

Gain = 1000 13 kHz

EL8173 Gain = 10 396 kHz

Gain = 20 221 kHz

Gain = 50 69 kHz

Gain = 100 30 kHz

I

S,EN

I

S,DIS

V

ENH

V

ENL

V

S

I

O

Supply Current, Enabled 40 60 78 µA

Supply Current, Disabled EN = VS+1.52.95µA

Enable Pin for Shut-down 2 V

Enable Pin for Power-on 0.8 V

Minimum Supply Voltage 2.2 2.4 V

Output Current into 10Ω to VS/2 VS = 5V ±18 ±29 mA

V

= 2.9V ±4 ±7.5 mA

S

Typical Performance Curves

65

60

55

50

45

40

GAIN (dB)

35

30

25

20

1 10 100 1k 10k 100k 1M

FIGURE 1. EL8170 FREQUENCY RESPONSE vs CLOSED

G=1000

G=500

G=200

G=100

G=50

VS=5V

FREQUENCY (Hz)

LOOP GAIN

45

40

35

30

25

20

GAIN (dB)

15

10

5

0

1 10 100 1k 10k 100k 1M

G=100

G=50

G=20

G=10

G=5

VS=5V

FREQUENCY (Hz)

FIGURE 2. EL8173 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN

4

FN7490.0

January 3, 2006

Typical Performance Curves (Continued)

EL8170, EL8173

45

40

35

30

25

20

GAIN (dB)

AV=100

15

=10kΩ

R

L

C

=10pF

L

10

5

0
100 10k1k 100k 1M

R
R
R

F/RG
F
G

=221kΩ

=99.02Ω

=2.23kΩ

FREQUENCY (Hz)

VS=3.3V

VS=5V

VS=2.9V

FIGURE 3. EL8170 FREQUENCY RESPONSE vs SUPPLY

VO LTAGE

50

45

40

35

GAIN (dB)

AV=100

=5V

V

S

=10kΩ

R

L

30

25

100 10k1k 100k

R

F/RG

=221kΩ

R

F

=2.23kΩ

R

G

=99.02Ω

CL=470pF

CL=220pF

FREQUENCY (Hz)

FIGURE 5. EL8170 FREQUENCY RESPONSE vs C

CL=820pF

CL=56pF

1M

LOAD

25

20

15

10

AV=10

=10kΩ

R

MAGNITUDE (dB)

L

C

=10pF

L

5

0
100 10k1k 100k

R
R
R

F/RG
F
G

=9.08Ω

=178kΩ

=19.6kΩ

FREQUENCY (Hz)

VS=5V

VS=3.3V

VS=2.9V

1M

FIGURE 4. EL8173 FREQUENCY RESPONSE vs SUPPLY

VOLTAGE

30

25

20

15

GAIN (dB)

AV=10

10

=5V

V

S

=10kΩ

R

L

=9.08Ω

R

F/RG

5

=178kΩ

R

F

=19.6kΩ

R

G

0
100 10k1k 100k

FREQUENCY (Hz)

CL=47pF

CL=27pF

FIGURE 6. EL8173 FREQUENCY RESPONSE vs C

CL=100pF

CL=2.7pF

1M

LOAD

1500

1000

VS=3.3V

500

VS=2.9V

-0.5 0 0.5 1.0 1.5 2.0 2.5

COMMON-MODE INPUT VOLTAGE (V)

AVERAGE INPUT BIAS CURRENT (pA)

0

-500

VS=5.0V

3.0 3.5 4.0 4.5 5.0 5.5

FIGURE 7. EL8170 AVERAGE INPUT BIAS CURRENT vs

COMMON-MODE INPUT VOLTAGE @ 25°C

5

2000

1500

1000

500

AVERAGE INPUT BIAS CURRENT (pA)

0

-0.5 0 0.5 1.0 1.5 2.0 2.5

COMMON-MODE INPUT VOLTAGE (V)

VS=2.9V

VS=5.0V

VS=3.3V

3.0 3.5 4.0 4.5 5.0 5.5

FIGURE 8. EL8173 AVERAGE INPUT BIAS CURRENT vs

COMMON-MODE INPUT VOLTAGE @ 25°C

FN7490.0

January 3, 2006