Document
TS271C,I,M
CMOS PROGRAMMABLE LOW POWER SINGLE OPERATIONAL AMPLIFIER
s OFFSET NULL CAPABILITY (by external
compensation)
s DYNAMIC CHARACTERISTICS
ADJUSTABLE ISET
s CONSUMPTION CURRENT AND DYNAMIC
PARAMETERS ARE STABLE REGARDING THE VOLTAGE POWER SUPPLY VARIATIONS OUTPUT VOLTAGE CAN SWING TO GROUND VERY LARGE ISET RANGE STABLE AND LOW OFFSET VOLTAGE THREE INPUT OFFSET VOLTAGE SELECTIONS
s s s s
N DIP8 (Plastic Package)
DESCRIPTION The TS271 is a low cost, low power single opertional 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 ISET 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 3). ORDER CODE
Package Part Number Temperature Range N TS271C/AC/BC 0°C, +70°C TS271I/AI/BI -40°C, +125°C TS271M/AM/BM -55°C, +125°C Example : TS271ACN • • • D • • •
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
D SO8 (Plastic Micropackage)
PIN CONNECTIONS (top view)
1 2 3 4 +
8 7 6 5
N = Dual in Line Package (DIP) D = Small Outline Package (SO) - also available in Tape & Reel (DT)
8 - I Set
November 2001
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TS271C,I,M
BLOCK DIAGRAM
VCC
Current source
xI
Input differential
Second stage
Output stage
Output
VCC
E E
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Vid Vi Io Iin Toper Tstg
+
Parameter Supply Voltage
3) 1) 2)
TS271C/AC/BC
TS271I/AI/BI 18 ±18 -0.3 to 18 ±30 ±5
TS271M/AM/BM
Unit V V V mA mA
Differential Input Voltage Input Voltage
Output Current for VCC+ ≥ 15V Input Current Operating Free-Air Temperature Range Storage Temperature Range 0 to +70
-40 to +125 -65 to +150
-55 to +125
°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.
OPERATING CONDITIONS
Symbol VCC+ Vicm Supply Voltage Common Mode Input Voltage Range Parameter Value 3 to 16 0 to VCC+ - 1.5 Unit V V
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SCHEMATIC DIAGRAM
VCC
T24
T 25
T 26 T6 T8
T27 T5
T 10 T 15
R2 T 28 T1
Input
T 18
T2
Input R1 C1
T11
T 12
T17
T7
T 23 T3
Output
T19 T4
T16
T9 T 13 T 14
T20
T 22
T21
T29
VCC
TS271C,I,M
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TS271C,I,M
OFFSET VOLTAGE NULL CIRCUIT RESISTOR BIASING
VCC+ VCC+
5 + 1 8 25kΩ
VCC
VO VO
+
+
R set
VCC-
R set
.