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| 型號： | AB-088 |
| 英文描述： | AB-088 - IMPROVED VOLTAGE REFERENCE FILTER HAS SEVERAL ADVANTAGES |
| 中文描述： | 抗體- 088 -改進(jìn)的電壓基準(zhǔn)過濾器有幾個(gè)好處 |
| 文件頁數(shù)： | 1/1頁 |
| 文件大?。?/td> | 18K |
| 代理商： | AB-088 |
APPLICATION BULLE TIN
Mailing Address: PO Box 11400 Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706
Tel: (602) 746-1111 Twx: 910-952-111 Telex: 066-6491 FAX (602) 889-1510 Immediate Product Info: (800) 548-6132
LEVEL SHIFTING SIGNALS
WITH DIFFERENTIAL AMPLIFIERS
by David Jones, (602) 746-7696
The INA105 is a unity gain differential amplifier consisting
of a premium grade operational amplifier and an on-chip
precision resistor network. The self-contained INA105 makes
it ideal for many applications. One such application is
precision level shifting.
Figure 1 shows a general case of a unity gain differential
amplifier that performs a signal level shift proportional to
the voltage V
SHIFT
appearing on pin 3 of the OPA27. An
operational amplifier is used to drive the INA105’s “Ref”
pin (pin 1) with a low impedance source to preserve true
differential operational of the INA105.
A basic understanding of the circuit operation can be gained
by considering the INA105 as a three input summing ampli-
fier. The voltage transfer function is then E
= E
– E
+
V
REF
. As this relation shows, the output will respond to a
difference signal and algebraically add the voltage at the
“Ref” input. Therefore, V
may take on any arbitrary value
that will not saturate the INA105 amplifier’s output. In the
case of the circuit in Figure 1, V
REF
= V
SHIFT
, yielding an
output of E
O
= E
2
– E
1
+V
SHIFT
.
Precision fixed level shifting can be easily accomplished by
the use of a voltage reference source such as the REF102. A
REF102 used with an additional INA105 can be used to
provide an accurate, low drift, +5V reference to drive the
“Ref” pin of the differentially connected INA105 as shown
in Figure 2. If, for example, the input signal is a bipolar
±
5V
signal, the output will be level shifted to a unipolar 0-10V
signal. The same reference circuit also has –5V available
and may thus be used for the opposite conversion from
unipolar 0-10V to bipolar
±
5V signals. (Request PDS-1018
for INA105 and PDS-900 for REF102.)
FIGURE 2. Precision Level Shift Circuit from a Fixed Volt-
age Reference.
–
+
2
4
6
INA105
2
5
1
3
6
–5V
REF102
+V
CC
1k
–
+
INA105
5
6
E
1
E
2
3
2
E
O
1
FIGURE 1. Level Shifting Circuit Using the INA105’s V
REF
Pin.
6
INA105
5
6
E
1
E
2
3
2
E
O
1
OPA27
V
SHIFT
3
2
1994 Burr-Brown Corporation
AB-087
Printed in U.S.A. January, 1994
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