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PDF 3656HG Data sheet ( Hoja de datos )

Número de pieza 3656HG
Descripción Transformer Coupled ISOLATION AMPLIFIER
Fabricantes Burr-Brown Corporation 
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® 3656
Transformer Coupled
ISOLATION AMPLIFIER
FEATURES
q INTERNAL ISOLATED POWER
q 8000V ISOLATION TEST VOLTAGE
q 0.5µA MAX LEAKAGE AT 120V, 60Hz
q 3-PORT ISOLATION
q IMR: 125dB REJECTION AT 60Hz
q 1" x 1" x 0.25" CERAMIC PACKAGE
DESCRIPTION
The 3656 was the first amplifier to provide a total
isolation function, both signal and power isolation, in
integrated circuit form. This remarkable advancement
in analog signal processing capability was accom-
plished by use of a patented modulation technique and
miniature hybrid transformer.
Versatility and performance are outstanding features
of the 3656. It is capable of operating with three
APPLICATIONS
q MEDICAL
Patient Monitoring and Diagnostic
Instrumentation
q INDUSTRIAL
Ground Loop Elimination and
Off-ground Signal Measurement
q NUCLEAR
Input/Output/Power Isolation
completely independent grounds (three-port isolation).
In addition, the isolated power generated is available
to power external circuitry at either the input or
output. The uncommitted op amps at the input and the
output allow a wide variety of closed-loop configura-
tions to match the requirements of many different
types of isolation applications.
Input
Demodulator
Pulse
Generator
+
Input
ISO
Power
Modulator
Rectifiers
and
Filters
Output
Demodulator
Rectifiers
and
Filters
Output
ISO
Power
SBOS132
This product is covered by the following United States patents: 4,066,974; 4,103,267; 4,082,908. Other patents pending may also apply upon the
allowance and issuance of patents thereon. The product may also be covered in other countries by one or more international patents corresponding
to the above-identified U.S. patents.
InternationalAirportIndustrialPark • MailingAddress:POBox11400,Tucson,AZ85734 • StreetAddress:6730S.TucsonBlvd.,Tucson,AZ 85706 • Tel:(520)746-1111 • Twx:910-952-1111
Internet:http://www.burr-brown.com/ • FAXLine:(800)548-6133(US/CanadaOnly) • Cable:BBRCORP • Telex:066-6491 • FAX:(520)889-1510 • ImmediateProductInfo:(800)548-6132
©1987 Burr-Brown Corporation
PDS-1403G
3656Printed in U.S.A. January, 1997
®

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3656HG pdf
TYPICAL PERFORMANCE CURVES (CONT)
All specifications typical at +25°C, unless otherwise specified.
QUIESCENT CURRENT vs TEMPERATURE
2.2
1.8
1.4
1
0.6
–55
–75 –50
–25 0
25 50
Temperature (°C)
75 85 100
ISOLATED OUTPUT VOLTAGE AND CURRENT
vs TEMPERATURE
8 16
6 12
±V at IISO = 0
48
±V at IISO = max
2
0
–55
–75 –50
Voltage
Current
4
0
–25 0
25 50
Temperature (°C)
75 85 100
QUIESCENT CURRENT AND ISOLATED VOLTAGE
OUTPUT vs SUPPLY VOLTAGE
15 10
13
=0
11 Voltage at I ISO
= ±5mA
9
Voltage
at I ISO
Current
7
8 10 12 14
Supply Voltage at V(V)
8
6
4
2
16
ISOLATION-MODE REJECTION vs GAIN
200
f = 60Hz
180
RC is resistance in series
160 with input common, pin 3.
140 RC = 0
120
RC = 5k
100
80
60
1
Shielded
Unshielded
10 100
Gain (V/V)
1000
20
10
0
–10
–20
–30
–40
–50
10
ISOLATION MODE REJECTION
vs FREQUENCY
100 1k 10k
Frequency (Hz)
100k
50
40
30
20
10
0
0
AC AND DC LEAKAGE CURRENT
vs ISOLATION VOLTAGE
DC
AC, 60Hz
2k 4k 6k 8k
Isolation Voltage (Vp)
2.5
2
1.5
1
0.5
0
10k
®
5 3656

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3656HG arduino
RF
6
RA
9
2
10
D
M
5
R1
100k
8
7
RC
A1
4
1
3
I/P PWR
FIGURE 5. Optional Offset Voltage Trim.
RX
RK
14
D
A2
15
11
17
16
12
13
RB
15V
+–
+
VOUT
O/P PWR
19
Pulse GEN
20
– 15V
+
R2
100k
0.47µF
Step 2: Output stage trim (RA = RB = 20M, RC = 100k,
RF = 0, RX = 100k, RK = , R1 and R2 connected);
A1 low, A2 low gain. Adjust R2 for 0V ±1mV or
desired setting at VOUT, pin 15 (±110mV approxi-
mate total range).
NOTE: Other circuit component values can be used with
valid results.
APPLICATIONS
ECG AMPLIFIER
Although the features of the circuit shown in Figure 6 are
important in patient monitoring applications, they may also
be useful in other applications. The input circuitry uses an
external, low quiescent current op amp (OPA177 type)
powered by the isolated power of the input stage to form a
high impedance instrumentation amplifier input (true three-
wire input). R3 and R4 give the input stage amplifier of the
3656 a noninverting gain of 10 and an inverting gain of –9.
R1 and R2 give the external amplifier a noninverting gain of
1 + 1/9. The inputs are applied to the noninverting inputs of
the two amplifiers and the composite input stage amplifier
has a gain of 10.
The 330k, 1W, carbon resistors and diodes D1 - D4 provide
protection for the input amplifiers from defibrillation pulses.
The output stage in Figure 6 is configured to provide a
bandpass filter with a gain of 22.7 (68M/3M). The high-
pass section (0.05Hz cutoff) is formed by the 1µF capacitor
and 3Mresistor which are connected in series between the
output demodulator and the inverting input of the output
stage amplifier. The low-pass section (100Hz cutoff) is
formed by the 68Mresistor and 22pF capacitor located in
the feedback loop of the output stage. The diodes provide for
quick recovery of the high-pass filter to overvoltages at the
input. The 100kpot and the 100Mresistor allow the
output voltage to be trimmed to compensate for increased
offset voltage caused by unbalanced impedances seen by the
inputs of the output stage amplifier.
In many modern electrocardiographic systems, the patient is
not grounded. Instead, the right-leg electrode is connected to
the output of an auxiliary operational amplifier as shown in
Figure 7. In this circuit, the common-mode voltage on the
body is sensed by the two averaging resistors, R1 and R2,
inverted, amplified, and fed back to the right-leg through
resistor R4. This negative feedback drives the common-
mode voltage to a low value. The body’s displacement
current id does not flow to ground, but rather to the output
circuit of A3. This reduces the pickup as far as the ECG
amplifier is concerned and effectively grounds the patient.
The value of R4 should be as large as practical to isolate the
patient from ground. The resistors R3 and R4 may be se-
lected by these equations:
R3 = (R1/2) (VO/VCM) and R4 = (VCM – VO)/id
(–10VVO +10V and –10V VCM +10V)
®
11 3656

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