ST LM2904W User Manual

LM2904W

Low power dual operational amplifier

Features

■Internally frequency compensated

■Large DC voltage gain: 100 dB

■Wide bandwidth (unity gain): 1.1 MHz (temperature compensated)

■Very low supply current/op (500 µA per channel)

■Low input bias current: 20 nA (temperature compensated)

■Low input offset current: 2 nA

■Input common-mode voltage range includes negative rail

■Differential input voltage range equal to the power supply voltage

■Large output voltage swing 0V to (VCC+ - 1.5 V)

■ESD internal protection: 2 kV

Description

This circuit consists of two independent, high gain, internally frequency compensated operational amplifiers, designed specifically for automotive and industrial control system. It operates from a single power supply over a wide range of voltages. The low power supply drain is independent of the magnitude of the power supply voltage.

Application areas include transducer amplifiers, DC gain blocks and all the conventional op-amp circuits which now can be more easily implemented in single power supply systems. For example, these circuits can be directly supplied from standard +5 V which is used in logic systems and will easily provide the required interface electronics without requiring any additional power supply.

In linear mode the input common-mode voltage range includes ground and the output voltage can

Datasheet — production data

N

DIP8

(Plastic package)

D

SO-8

(Plastic micropackage)

P

TSSOP8

(Thin shrink small outline package)

Pin connections (top view)

also swing to ground, even though operated from a single power supply.

July 2012

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This is information on a product in full production.

www.st.com

Schematic diagram	LM2904W

1 Schematic diagram

Figure 1. Schematic diagram (1/2 LM2904W)

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LM2904W	Absolute maximum ratings and operating conditions

2 Absolute maximum ratings and operating conditions

	Table 1.	Absolute maximum ratings (AMR)
	Symbol	Parameter	Value	Unit
	VCC	Supply voltage (1)	+32	V
	Vid	Differential input voltage(2)	-0.3V to VCC + 0.3	V
	Vin	Input voltage	-0.3V to VCC + 0.3	V
		Output short-circuit duration(3)	Infinite	s
	Iin	Input current (4)	50	mA
	Tstg	Storage temperature range	-65 to +150	°C
	Tj	Maximum junction temperature	150	°C
		Thermal resistance junction to ambient(5)
	Rthja	SO-8	125	°C/W
		TSSOP8	120
		DIP8	85
		Thermal resistance junction to case(5)
	Rthjc	SO-8	40	°C/W
		TSSOP8	37
		DIP8	41
	Tstg	Storage temperature range	-65 to +150	°C
		HBM: human body model(6)	2000
	ESD	MM: machine model(7)	200	V
		CDM: charged device model(8)	1500

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.Short-circuits from the output to VCC can cause excessive heating if VCC+ > 15 V. The maximum output current is approximately 40 mA, independent of the magnitude of VCC. Destructive dissipation can result from simultaneous shortcircuits on all amplifiers.

4.This input current only exists when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP transistor becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also NPN parasitic action on the IC chip. This transistor action can cause the output voltages of the

Op-amps to go to the VCC voltage level (or to ground for a large overdrive) for the time during which an input is driven negative. This is not destructive and normal output is restored for input voltages above -0.3 V.

5.Short-circuits can cause excessive heating and destructive dissipation. Rth are typical values.

6.Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin combinations with other pins floating.

7.Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin combinations with other pins floating.

8.Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to the ground.

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Absolute maximum ratings and operating conditions							LM2904W
Table 2.	Operating conditions
Symbol				Parameter	Value		Unit
VCC	Supply voltage				3 to 30		V
	Common mode input voltage range				V	+ - 1.5
Vicm			≤ T	≤ T	CC		V
	T	min			V	+ - 2
			amb	max		CC
Toper	Operating free-air temperature range				-40 to +125		°C

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LM2904W

Electrical characteristics

3

Electrical characteristics

Table 3.

V

+ = 5V, V

-

= Ground, V = 1.4V, T

= 25°C (unless otherwise specified)

CC

CC

O

amb

Symbol

Parameter

Min.

Typ.

Max.

Unit

Vio

Input offset voltage (1)

2

7

mV

Tmin ≤ Tamb ≤ Tmax

9

DVio

Input offset voltage drift

7

30

µV/°C

Iio

Input offset current

2

30

nA

Tmin ≤ Tamb ≤ Tmax

40

DIio

Input offset current drift

10

300

pA/°C

Iib

Input bias current (2)

20

150

nA

Tmin ≤ Tamb ≤ Tmax

200

Large signal voltage gain

A

vd

V

CC

+= +15V, R =2kΩ, V =1.4V to 11.4V

50

100

V/mV

L

o

Tmin ≤ Tamb ≤ Tmax

25

Supply voltage rejection ratio

SVR

RS ≤10kΩ

65

100

dB

Tmin ≤ Tamb ≤ Tmax

65

Supply current, all Amp, no load

ICC

VCC = +5V

0.7

1.2

mA

Tmin ≤ Tamb ≤ Tmax, VCC = +30V

2

Common-mode rejection ratio

CMR

RS = 10kΩ

70

85

dB

Tmin ≤ Tamb ≤ Tmax

60

Isource

Output short-circuit current

20

40

60

mA

V

CC

+ = +15V, V

= +2V, V = +1V

o

id

Output sink current

Isink

VO = 2V, VCC+ = +5V

10

20

mA

VO = +0.2V, VCC+ = +15V

12

50

µA

High level output voltage

VCC+ = + 30V

VOH

RL = 2kΩ

26

V

Tmin ≤ Tamb ≤ Tmax

26

27

RL = 10kΩ

27

Tmin ≤ Tamb ≤ Tmax

27

28

Low level output voltage

VOL

RL = 10kΩ

5

20

mV

Tmin ≤ Tamb ≤ Tmax

20

Slew rate

SR

V

CC

+ = 15V, V

in

= 0.5 to 3V, R = 2kΩ, C

L

= 100pF, unity gain

0.3

0.6

V/µs

L

Tmin ≤ Tamb ≤ Tmax

0.2

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Electrical characteristics

LM2904W

Table 3.

V

+

= 5V, V

- = Ground, V

= 1.4V, T

= 25°C (unless otherwise specified)

CC

CC

O

amb

Symbol

Parameter

Min.

Typ.

Max.

Unit

GBP

Gain bandwidth product

0.7

1.1

MHz

f = 100kHz, V

+

= 30V, V

= 10mV, R = 2kΩ, C

= 100pF

in

L

CC

L

Total harmonic distortion

THD

f = 1kHz, AV = 20dB, RL = 2kΩ,

0.02

%

V

o

= 2V

, C

L

= 100pF, V

+ = 30V

pp

CC

en

Equivalent input noise voltage

55

nV/√Hz

f = 1kHz, R

= 100Ω, V

+ = 30V

S

CC

VO1/VO2

Channel separation (3)

120

dB

1kHz ≤ f ≤ 20kHz

1.VO = 1.4 V, RS = 0 Ω, 5 V < VCC+ < 30 V, 0 V < Vic < VCC+ - 1.5 V

2.The direction of the input current is out of the IC. This current is essentially constant, independent of the state of the output, so there is no change in the loading charge on the input lines.

3.Due to the proximity of external components, ensure that stray capacitance does not cause coupling between these external parts. Typically, this can be detected because this type of capacitance increases at higher frequencies.

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