ST TS271C User Manual

TS271AC

TS271C,I,M

PROGRAMMABLE CMOS

SINGLE OPERATIONAL AMPLIFIERS

.OFFSET NULL CAPABILITY (by external

.compensation)

DYNAMIC CHARACTERISTICS

.ADJUSTABLE BY ISET

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

N	D
DIP8	SO8
(Plastic Package)	(Plastic Micropackage)

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 SGS-THOMSON silicon gate CMOS process giving it an excellent consumption-speed ratio. This amplifier is ideally suited for low consumption applications.

ORDER CODES

	Part Number	Temperature	Package
		Range	N	D
	TS271C/AC/BC	0oC, +70oC	●	●
	TS271I/AI/BI	-40oC, +125oC	●	●
	TS271M/AM/BM	-55oC, +125oC	●	●

Example : TS271ACN

PIN CONNECTIONS (top view)

1

8

The power supply is externally programmable with a resistor connectedbetween 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).

2	-	7
3	+	6
4		5
1	- Offset Null 1
2	- Inverting Input
3	- Non-inverting Input
4	- V CC -
5	- Offset Null 2
6	- Output
7	- V CC +
8	- I

SET

October 1997

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TS271C,I,M

BLOCK DIAGRAM

			VCC
		Output
		stage	Output
	Input	Second
	differential	stage
			VCC
	Offset null
	E	E
	Iset Input	Input
MAXIMUM RATINGS
Symbol	Parameter		Value	Unit
+	Supply Voltage - (note 1)		18	V
VCC
Vid	Differential Input Voltage - (note 2)		±18	V
Vi	Input Voltage - (note 3)		-0.3 to 18	V
IO	Output Current for VCC+ ≥ 15V		±30	mA
Iin	Input Current		±5	mA
Toper	Operating Free-Air Temperature Range			oC
		TS271C/AC/BC	0 to +70
		TS271I/AI/BI	-40 to +125
		TS271M/AM/BM	-55 to +125
Tstg	Storage Temperature Range		-65 to +150	oC
Notes : 1. All voltage 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	Parameter		Value	Unit
+	Supply Voltage		3 to 16	V
VCC
Vicm	Common Mode Input Voltage Range		0 to VCC+ - 1.5	V

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VCC

T27
T26	T5			T6	T10
T28						T15
				T8
T1	T2	Input +
Input -			R1	T11	T12
Set Current		C1
					C2	Output
				T7
T3		T4				T16
				T13	T14

T29	T9

Offset Null 1

Offset Null 2

VCC

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DIAGRAM SCHEMATIC

TS271C,I,M

TS271C,I,M

OFFSET VOLTAGE NULL CIRCUIT

RESISTOR BIASING

VCC	VCC
5

1

8

	VCC			VO		VO
Ω
25k
				R set		R set
R set
			VCC			VCC
		RSET CONNECTED TO			RSET CONNECTED TO
OFFSET COMPENSATION GUARANTEED FOR		GROUND			VCC-	(RSET VALUE : SEE
					Fig.1)
TS271BCX (ISET > 25μA),TS271ACX (ISET> 90μA)
Figure 1 : RSET Connected to VCC-.
	V CC	= +3V	V CC	= +10V
	V	= +5V	V	= +16V
	CC		CC
R set
10M Ω
1M Ω
100k Ω
10k Ω
0. 1μA	1μA	1 0μA	100μA		I set

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TS271C,I,M

ELECTRICAL CHARACTERISTICS FOR ISET = 1.5μA

VCC+ = +10V, VCC- = 0V, Tamb = 25oC (unless otherwise specified)

			TS271C/AC/BC				TS271I/AI/BI
	Symbol	Parameter				TS271M/AM/BM			Unit
			Min.	Typ.	Max.	Min.	Typ.	Max.
	Vio	Input Offset Voltage							mV
		VO = 1.4V, Vic = 0V TS271C/I/M		1.1	10		1.1	10
		TS271AC/AI/AM		0.9	5		0.9	5
		TS271BC/BI/BM		0.25	2		0.25	2
		Tmin. ≤ Tamb ≤ Tmax. TS271C/I/M			12			12
		TS271AC/AI/AM			6.5			6.5
		TS271BC/BI/BM			3			3.5
	DVio	Input Offset Voltage Drift		0.7			0.7		μV/oC
	Iio	Input Offset Current - (note 1)		1			1		pA
		Vic = 5V, Vo = 5V
		Tmin. ≤ Tamb ≤ Tmax.			100			200
	Iib	Input Bias Current - (note 1)		1			1		pA
		Vic = 5V, Vo = 5V
		Tmin. ≤ Tamb ≤ Tmax.			150			300
	VOH	High Level Output Voltage							V
		Vid = 100mV, RL = 1MΩ	8.8	9		8.8	9
		Tmin. ≤ Tamb ≤ Tmax.	8.7			8.6
	VOL	Low Level Output Voltage (Vid = -100mV)			50			50	mV
	Avd	Large Signal Voltage Gain							V/mV
		Vo = 1V to 6V, RL = 1MΩ, Vic = 5V	30	100		30	100
		Tmin. ≤ Tamb ≤ Tmax.	20			20
	GBP	Gain Bandwidth Product (Av = 40dB,							MHz
		RL = 1MΩ, CL = 100pF, fin = 10kHz)		0.1			0.1
	CMR	Common Mode Rejection Ratio							dB
		Vo = 1.4V, Vic = 1V to 7.4V	60	80		60	80
	SVR	Supply Voltage Rejection Ratio							dB
		VCC+ = 5V to 10V ,Vo = 1.4V	60	80		60	80
	ICC	Supply Current							μA
		Av = 1, no load, Vo = 5V		10	15		10	15
		Tmin. ≤ Tamb ≤ Tmax.			17			18
	Io	Output Short Circuit Current							mA
		Vid = 100mV, Vo = 0V		60			60
	Isink	Output Sink Current							mA
		Vid = -100mV, Vo = VCC		45			45
	SR	Slew-Rate at Unity Gain							V/μs
		RL = 1MΩ, CL= 100pF, Vi = 3 to 7V		0.04			0.04
	m	Phase Margin at Unity Gain							Degrees
		Av = 40dB, RL = 1MΩ		35			35
		CL= 10pF
		CL= 100pF		10			10
	Kov	Overshoot Factor		40			40		%
		CL = 10pF
		CL = 100pF		70			70
	en	Equivalent Input Noise Voltage							nV
		f = 1kHz, RS = 100Ω		68			68		```√ Hz

Note : 1. Maximum values including unavoidable inaccuracies of the industrial test.

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