TS271
CMOS Programmable
Low Power Single Operational Amplifier
■
■
■
■
■
■
■
Offset null capability (by external
compensation)
Dynamic characteristics adjustable I
SET
Consumption current and dynamic
parameters are stable regarding the
voltage power supply variations
Output voltage can swing to ground
Very large I
SET
range
Stable and low offset voltage
Three input offset voltage selections
D
SO-8
(Plastic Micropackage)
N
DIP8
(Plastic Package)
Description
The TS271 is a low cost, low power single
operational amplifier designed to operate with
single or dual supplies. This operational amplifier
uses the ST silicon gate CMOS process giving it
an excellent consumption-speed ratio. This
amplifier is ideally suited for low consumption
applications.
The power supply is externally programmable with
a resistor connected between pins 8 and 4. It
allows to choose the best consumption-speed
ratio and supply current can be minimized
according to the required speed. This device is
specified for the following I
SET
current values:
1.5µA, 25µA, 130µA.
This CMOS amplifier offers very high input
impedance and extremely low input currents. The
major advantage versus JFET devices is the very
low input currents drift with temperature see
Figure 8, Figure 19, Figure 30.
Pin Connections (top view)
1
2
3
4
-
+
8
7
6
5
1 - Offset Null 1
2 - Inverting Input 1
3 - Non-inverting Input 1
4 - V
CC
-
5 - Offset Null 2
6 - Output
7-V +
CC
8 - I
Set
Order Codes
Part Number
TS271CN/ACN
TS271CD/CDT/ACD/ACDT
TS271IN/AIN/
TS271ID/IDT/AID/AIDT/BID/BIDT
TS271BMD
Temperature Range
0°C, +70°C
-40°C, +125°C
-55°C, +125°C
Package
DIP
SO
DIP
SO
SO
Packaging
Tube
Tube and Tape & Reel
Tube
Tube and Tape & Reel
Tube
March 2005
Revision 2
1/17
Absolute Maximum Ratings
TS271
2 Absolute Maximum Ratings
Table 1. Key parameters and their absolute maximum ratings
Symbol
VCC
+
Vid
V
i
I
o
I
in
T
oper
T
stg
Parameter
Supply Voltage
1
Differential Input Voltage
2
Input Voltage
3
Output Current for V
CC+
≥
15V
Input Current
Operating Free-Air Temperature Range
Storage Temperature Range
0 to +70
TS271C/AC/BC
TS271I/AI/BI
18
±18
-0.3 to 18
±30
±5
-40 to +125
-65 to +150
-55 to +125
TS271M/AM/BM
Unit
V
V
V
mA
mA
°C
°C
1) All values, except differential voltage are with respect to network ground terminal.
2) Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
3) The magnitude of the input and the output voltages must never exceed the magnitude of the positive supply voltage.
Table 2. Operating conditions
Symbol
V
CC+
V
icm
Supply Voltage
Common Mode Input Voltage Range
Parameter
Value
3 to 16
0 to V
CC+
- 1.5
Unit
V
V
3/17
Absolute Maximum Ratings
Figure 3. Offset voltage null circuit
-
V
CC+
V
CC+
TS271
Figure 5. Resistor biasing
5
+
1
8
25kΩ
V
CC
-
+
-
V
O
-
V
O
+
R
set
V
CC
-
R
set
R
set
V
CC
-
R
set
CONNECTED TO GROUND
R
set
CONNECTED TO V
CC
- (R
set
VALUE : SEE Fig. 1)
OFFSET COMPENSATION GUARANTEED FOR
TS271BCX (I
SET
> 25
µ
A), TS271ACX (I
SET
> 90
µ
A)
Figure 4. Offset voltage null circuit
-
Figure 6. Rset connected to Vcc-
V
CC
= +3V
V
CC
= +5V
V
CC
= +16V
V
CC
= +10V
5
+
1
8
25kΩ
V
CC
-
Rset
10MΩ
1MΩ
R
set
100kΩ
OFFSET COMPENSATION GUARANTEED FOR
TS271BCX (I
SET
> 25
µ
A), TS271ACX (I
SET
> 90
µ
A)
10kΩ
0.1
µ
A
1
µ
A
10
µ
A
100
µ
A
I
set
5/17