ISO120
ISO121
Precision Low Cost
ISOLATION AMPLIFIER
FEATURES
q
q
q
q
q
q
q
q
q
q
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
O
=
±
10V
0.3"-WIDE 24-PIN HERMETIC DIP, ISO120
SYNCHRONIZATION CAPABILITY
WIDE TEMP RANGE: –55
°
C to +125
°
C
(ISO120)
APPLICATIONS
q
INDUSTRIAL PROCESS CONTROL: Trans-
ducer Isolator for Thermocouples, RTDs,
Pressure Bridges, and Flow Meters, 4mA
to 20mA Loop Isolation
q
GROUND LOOP ELIMINATION
q
MOTOR AND SCR CONTROL
q
POWER MONITORING
q
ANALYTICAL MEASUREMENTS
q
BIOMEDICAL MEASUREMENTS
q
DATA ACQUISITION
q
TEST EQUIPMENT
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
V
OS
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.
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1988 Burr-Brown Corporation
Isolation Barrier
C
1H
C
1L
V
IN
C
2H
C
2L
Sense
V
OUT
Signal
Com 1
Ext Osc
+V
S1
Gnd 1
–V
S1
–V
S2
Gnd 2
+V
S2
Signal
Com 2
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
PDS-820D
Printed in U.S.A. March, 1992
SBOS158
SPECIFICATIONS
ELECTRICAL
At T
A
= +25°C: V
S1
= V
S2
=
±15V:
and R
L
= 2kΩ, unless otherwise noted.
ISO120BG, ISO121BG
PARAMETER
CONDITIONS
MIN
1500
2121
3500
4950
2500
5600
115
160
115
160
10
14
|| 2
0.18
1
±0.04
±5
±0.005
1
±0.04
±40
±0.02
±5
±100
±25
±250
±2
4
±10
±15
200
±12.5
±15
0.1
10
60
6
2
50
350
150
*
TYP
MAX
ISO120G, ISO120SG
(4)
, ISO121G
MIN
*
*
*
*
*
*
*
*
*
*
*
*
1
±0.05
±10
±0.01
1
±0.05
±40
±0.04
±10
±150
±40
±500
±2
4
*
*
*
*
*
*
*
*
*
*
*
*
TYP
MAX
UNITS
Vrms
VDC
Vrms
VDC
Vrms
Vrms
dB
dB
dB
dB
Ω
|| pF
µArms
V/V
%FSR
ppm/°C
%FSR
V/V
%FSR
ppm/°C
%FSR
mV
µV/°C
mV
µV/°C
mV/V
µV/√Hz
V
kΩ
V
mA
µF
mVp-p
kHz
kHz
V/µs
µs
µs
µs
ISOLATION
Voltage Rated Continuous ISO120: AC 60Hz
T
MIN
to T
MAX
DC
T
MIN
to T
MAX
ISO121: AC 60Hz
T
MIN
to T
MAX
DC
T
MIN
to T
MAX
100% Test (AC 60Hz): ISO120
1s; Partial Discharge
≤
5pC
ISO121
1s; Partial Discharge
≤
5pC
Isolation Mode Rejection ISO 120: AC 60Hz
1500Vrms
DC
ISO121: AC60Hz
3500Vrms
DC
Barrier Impedance
Leakage Current
V
ISO
= 240Vrms, 60Hz
GAIN
(4)
Nominal Gain
Gain Error
Gain vs Temperature
Nonlinearity
Nominal Gain
Gain Error
Gain vs Temperature
Nonlinearity
INPUT OFFSET VOLTAGE
(4)
Initial Offset
vs Temperature
Initial Offset
vs Temperature
Initial Offset
vs Supply
Noise
INPUT
Voltage Range
(1)
Resistance
OUTPUT
Voltage Range
Current Drive
Capacitive Load Drive
Ripple Voltage
(2)
FREQUENCY RESPONSE
Small Signal Bandwith
Slew Rate
Settling Time
0.1%
0.01%
Overload Recovery Time
(3)
POWER SUPPLIES
Rated Voltage
Voltage Range
Quiescent Current: V
S1
V
S2
TEMPERATURE RANGE
Specification: BG and G
SG
(4)
Operating
Storage
θ
JA
: ISO120
ISO121
C
1
= C
2
= 0
C
1
= C
2
= 1000pF
V
O
=
±10V
C
2
= 100pF
C
1
= C
2
= 1000pF
50% Output Overload,
C
1
= C
2
= 0
V
O
=
±10V
C
1
= C
2
= 1000pF
0.5
*
±0.1
±20
±0.01
±0.25
±0.1
±25
±150
±100
±0.25
±40
±0.05
±0.25
±0.1
±50
±400
±100
C
1
= C
2
= 0
C
1
= C
2
= 1000pF
C
1
= C
2
= 0
±V
S1
or
±V
S2
=
±4.5V
to
±18V
±10
±5
*
*
15
±4.5
±4.0
±5.0
±18
±5.5
±6.5
85
85
125
150
40
25
*
*
*
*
–25
–55
–55
–55
40
25
*
*
*
85
125
125
150
V
V
mA
mA
°C
°C
°C
°C
°C/W
°C/W
–25
–25
–55
–65
*Specifications same as ISO120BG, ISO121BG.
NOTE: (1) Input voltage range =
±10V
for V
S1
, V
S2
=
±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
2
. (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.
ISO120/121
2
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (any supply) ............................................................... 18V
V
IN
, 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
V
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
CONNECTION DIAGRAM
C
1H
C
1L
+V
S1
–V
S1
1/1
(1)
2/2
3/3
4/4
24/40
23/39
22/38
21/37
Gnd 1
V
IN
Ext Osc
Com 1
PACKAGE INFORMATION
(1)
MODEL
ISO120G
ISO120BG
ISO120SG
ISO121G
ISO121BG
PACKAGE
24-Pin DIP
24-Pin DIP
24-Pin DIP
40-Pin DIP
40-Pin DIP
PACKAGE DRAWING
NUMBER
225
225
225
206
206
NOTE: (1) First pin number is for ISO120.
Second pin number is for ISO121.
Com 2
9/17
16/24
15/23
14/22
13/21
–V
S2
+V
S2
C
2L
C
2H
V
OUT
10/18
Sense 11/19
Gnd 2 12/20
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
ORDERING INFORMATION
MODEL
ISO120G
ISO120BG
ISO120SG
ISO121G
ISO121BG
TEMPERATURE
RANGE
–25°C to 85°C
–25°C to 85°C
–55C to 125°C
–25°C to 85°C
–25°C to 85°C
ELECTROSTATIC
DISCHARGE SENSITIVITY
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.
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.
3
ISO120/121
TYPICAL PERFORMANCE CURVES
T
A
= +25°C; V
S1
= V
S2
=
±15V;
and R
L
= 2kΩ, unless otherwise noted.
ISOLATION MODE VOLTAGE
vs FREQUENCY ISO121
Max DC Rating
5k
Peak Isolation Voltage
Max AC
Rating
Degraded
Performance
100
Typical
Performance
10
100
1k
10k
100k
Frequency (Hz)
1M
10M
100M
ISOLATION MODE VOLTAGE
vs FREQUENCY ISO120
Max DC Rating
Peak Isolation Voltage
2.1k
1k
Degraded
Performance
100
Typical
Performance
10
100
1k
10k
100k
Frequency (Hz)
1M
1k
Max AC
Rating
10M
100M
BANDWIDTH vs C
2
100nF
PHASE SHIFT vs C
2
100
10nF
Phase Shift (degrees)
C
2
= 1000pF
10
C
2
= 0
1
C
2
1000pF
0
100
1k
10k
100k
–3dB Frequency (Hz)
0.1
100
1k
Frequency (Hz)
10k
100k
PSRR vs FREQUENCY
60
54
10mA
Leakage Current (rms)
ISOLATION LEAKAGE CURRENT
vs FREQUENCY
100mA
40
PSRR (dB)
1mA
100µA
10µA
1µA
240 Vrms
3500 Vrms
1500 Vrms
+V
S1
, +V
S2
20
–V
S1
, –V
S2
0
1
10
100
1k
Frequency (Hz)
10k
100k
1M
0.1µA
1
10
100
1k
Frequency (Hz)
10k
100k
1M
ISO120/121
4
TYPICAL PERFORMANCE CURVES
(CONT)
T
A
= +25°C; V
S1
= V
S2
=
±15V;
and R
L
= 2kΩ, unless otherwise noted.
IMR vs FREQUENCY
160
140
120
IMR (dB)
0
–20dB/dec (for comparison only)
–20
SIGNAL RESPONSE vs CARRIER FREQUENCY
100
80
60
40
1
10
100
1k
Frequency (Hz)
10k
100k
1M
V
OUT
/V
IN
(dB)
–40
f
IN
(Hz)
0
f
c
/2
f
C
0
f
C
/2
2f
C
0
f
C
/2
3f
C
0
f
OUT
(Hz) 0
SYNCHRONIZATION RANGE at 25°C
±4Vp SINE WAVE INPUT TO EXT OSC
10nF
Typical
Free Run
Frequency
Noise, e
N
(µV/ Hz)
NOISE vs SMALL SIGNAL BANDWIDTH
12
10
8
6
4
2
*C
1
≤
5000pF
C
2
= C
1
*
C
1
1000pF
C
2
= 2C
1
0
1k
10k
100k
C
2
≥
C
1
Frequency (Hz)
1M
0
0.1f
–3dB
0.2f
–3dB
0.5f
–3dB
f
–3dB
Normalized Frequency
SINE RESPONSE
(f = 2kHz, C
2
= 0)
SINE RESPONSE
(f = 20kHz, C
2
= 0)
+10
Output Voltage (V)
Output Voltage (V)
+10
0
0
–10
–10
0
500
Time (µs)
1000
0
50
Time (µs)
100
FPO
BLEED
TO EDGE
OF BOX
5
ISO120/121
京公网安备 11010802033920号
EEWORLD
