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Precision Low Cost

ISOLATION AMPLIFIER

ISO120

ISO121

Signal

Com 2

–V

Gnd 2

Ext Osc

Gnd 1

–V

Signal

Com 1

OUT

Sense

Isolation Barrier

DESCRIPTION

The ISO120 and ISO121 are precision isolation ampli-

fiers incorporating a novel duty cycle modulation-

demodulation technique. The signal is transmitted

digitally across a 2pF differential capacitive barrier.

With digital modulation the barrier characteristics do

not affect signal integrity, which results in excellent

reliability and good high frequency transient immu-

nity across the barrier. Both the amplifier and barrier

capacitors are housed in a hermetic DIP. The ISO120

and ISO121 differ only in package size and isolation

voltage rating.

These amplifiers are easy to use. No external compo-

nents are required for 60kHz bandwidth. With the

addition of two external capacitors, precision specifi-

cations of 0.01% max nonlinearity and 150µV/°C max

drift are guaranteed with 6kHz bandwidth. A

power supply range of ±4.5V to ±18V and low quies-

cent current make these amplifiers ideal for a wide

range of applications.

FEATURES

● 100% TESTED FOR PARTIAL DISCHARGE

● ISO120: Rated 1500Vrms

● ISO121: Rated 3500Vrms

● HIGH IMR: 115dB at 60Hz

● USER CONTROL OF CARRIER

FREQUENCY

● LOW NONLINEARITY:

±0.01% max

● BIPOLAR OPERATION: V

= ±10V

● 0.3"-WIDE 24-PIN HERMETIC DIP, ISO120

● SYNCHRONIZATION CAPABILITY

● WIDE TEMP RANGE: –55

°C to +125°C

(ISO120)

APPLICATIONS

● INDUSTRIAL PROCESS CONTROL: Trans-

ducer Isolator for Thermocouples, RTDs,

Pressure Bridges, and Flow Meters, 4mA

to 20mA Loop Isolation

● GROUND LOOP ELIMINATION

● MOTOR AND SCR CONTROL

● POWER MONITORING

● ANALYTICAL MEASUREMENTS

● BIOMEDICAL MEASUREMENTS

● DATA ACQUISITION

● TEST EQUIPMENT

International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706

Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

SBOS158

2ISO120/121

SPECIFICATIONS

ELECTRICAL

At T

= +25°C: V

= V

= ±15V: and R

= 2kΩ, unless otherwise noted.

*Specifications same as ISO120BG, ISO121BG.

NOTE: (1) Input voltage range = ±10V for V

, V

= ±4.5VDC to ±18VDC. (2) Ripple frequency is at carrier frequency. (3) Overload recovery is approximately three times

the settling time for other values of C

. (4) The SG-grade is specified –55°C to +125°C; performance of the SG in the –25°C to +85°C temperature range is the same

as the BG-grade.

ISO120BG, ISO121BG ISO120G, ISO120SG

(4)

, ISO121G

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

ISOLATION

Voltage Rated Continuous ISO120: AC 60Hz T

MIN

to T

MAX

1500 * Vrms

DC T

MIN

to T

MAX

2121 * VDC

ISO121: AC 60Hz T

MIN

to T

MAX

3500 * Vrms

DC T

MIN

to T

MAX

4950 * VDC

100% Test (AC 60Hz): ISO120 1s; Partial Discharge ≤ 5pC 2500 * Vrms

ISO121 1s; Partial Discharge ≤ 5pC 5600 * Vrms

Isolation Mode Rejection ISO 120: AC 60Hz 1500Vrms 115 * dB

DC 160 * dB

ISO121: AC60Hz 3500Vrms 115 * dB

DC 160 * dB

Barrier Impedance 10

|| 2 * Ω || pF

Leakage Current V

ISO

= 240Vrms, 60Hz 0.18 0.5 * * µArms

GAIN

(4)

= ±10V

Nominal Gain C

= C

= 1000pF 1 1 V/V

Gain Error ±0.04 ±0.1 ±0.05 ±0.25 %FSR

Gain vs Temperature ±5 ±20 ±10 ±40 ppm/°C

Nonlinearity ±0.005 ±0.01 ±0.01 ±0.05 %FSR

Nominal Gain C

= C

= 0 1 1 V/V

Gain Error ±0.04 ±0.25 ±0.05 ±0.25 %FSR

Gain vs Temperature ±40 ±40 ppm/°C

Nonlinearity ±0.02 ±0.1 ±0.04 ±0.1 %FSR

INPUT OFFSET VOLTAGE

(4)

Initial Offset C

= C

= 1000pF ±5 ±25 ±10 ±50 mV

vs Temperature ±100 ±150 ±150 ±400 µV/°C

Initial Offset C

= C

= 0 ±25 ±100 ±40 ±100 mV

vs Temperature ±250 ±500 µV/°C

Initial Offset

vs Supply ±V

or ±V

= ±4.5V to ±18V ±2 ±2 mV/V

Noise 44µV/√Hz

INPUT

Voltage Range

(1)

±10 ±15 * * V

Resistance 200 * kΩ

OUTPUT

Voltage Range ±10 ±12.5 * * V

Current Drive ±5 ±15 * * mA

Capacitive Load Drive 0.1 * µF

Ripple Voltage

(2)

10 * mVp-p

FREQUENCY RESPONSE

Small Signal Bandwith C

= C

= 0 60 * kHz

= C

= 1000pF 6 * kHz

Slew Rate 2*V/µs

Settling Time V

= ±10V

0.1% C

= 100pF 50 * µs

0.01% C

= C

= 1000pF 350 * µs

Overload Recovery Time

(3)

50% Output Overload, 150 * µs

= C

= 0

POWER SUPPLIES

Rated Voltage 15 * V

Voltage Range ±4.5 ±18 * * V

Quiescent Current: V

±4.0 ±5.5 * * mA

±5.0 ±6.5 * * mA

TEMPERATURE RANGE

Specification: BG and G –25 85 –25 85 °C

(4)

–25 85 –55 125 °C

Operating –55 125 –55 125 °C

Storage –65 150 –55 150 °C

: ISO120 40 40 °C/W

ISO121 25 25 °C/W

ISO120/121

PACKAGE DRAWING

MODEL PACKAGE NUMBER

ISO120G 24-Pin DIP 225

ISO120BG 24-Pin DIP 225

ISO120SG 24-Pin DIP 225

ISO121G 40-Pin DIP 206

ISO121BG 40-Pin DIP 206

NOTE: (1) For detailed drawing and dimension table, please see end of data

sheet, or Appendix D of Burr-Brown IC Data Book.

ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM

Supply Voltage (any supply) ............................................................... 18V

, Sense Voltage .......................................................................... ±100V

External Oscillator Input .................................................................... ±25V

Signal Common 1 to Ground 1 ........................................................... ±1V

Signal Common 2 to Ground 2 ........................................................... ±1V

Continuous Isolation Voltage: ISO120 ...................................... 1500Vrms

ISO121 ....................................... 3500Vrms

ISO

, dv/dt ...................................................................................... 20kV/µs

Junction Temperature ...................................................................... 150°C

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

Lead Temperature (soldering, 10s) ............................................... +300°C

Output Short Duration ......................................... Continuous to Common

PACKAGE INFORMATION

(1)

1/1 

2/2

3/3

4/4



9/17

10/18

11/19

12/20

(1)

C 

+V 

–V 



Com 2

V 

Sense

Gnd 2

1H

1L

S1



OUT

24/40

23/39

22/38

21/37



16/24

15/23

14/22

13/21

Gnd 1

V

Ext Osc

Com 1



–V

+V

C

IN



S2

2L

NOTE: (1) First pin number is for ISO120.

Second pin number is for ISO121.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.

Electrostatic discharge can cause damage ranging from per-

formance degradation to complete device failure. Burr-Brown

Corporation recommends that all integrated circuits be handled

and stored using appropriate ESD protection methods.

ELECTROSTATIC

DISCHARGE SENSITIVITY

ORDERING INFORMATION

TEMPERATURE

MODEL RANGE

ISO120G –25°C to 85°C

ISO120BG –25°C to 85°C