ST LM2904, LM2904A User Manual

LM2904, LM2904A

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/amplifier, essentially independent of supply voltage

■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 0 V to (VCC+ -1.5 V)

Description

This circuit consists of two independent, high gain, internally frequency-compensated operational amplifiers designed specifically for automotive and industrial control systems. 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 can now be more easily implemented in single power supply systems. For example, these circuits can be directly supplied from the standard +5 V which is used in logic systems and easily provides the required interface electronics without requiring any additional power supply.

In the linear mode, the input common-mode voltage range includes ground and the output voltage can also swing to ground, even though operated from a single power supply.

N

DIP8

(Plastic package)

D

SO-8

(Plastic micropackage)

P

TSSOP8

(Thin shrink small outline package)

S

MiniSO-8

Q2 DFN8 2 x 2 mm

(Plastic micropackage)

Pin connections (top view)

January 2012

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Contents	LM2904, LM2904A

Contents

1	Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
2	Absolute maximum ratings and operating conditions . . . . . . . . . . . . .		4
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6
	3.1	Typical single-supply applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
4	Macromodel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13
5	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14
	5.1	DIP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	5.2	SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
	5.3	DFN8 2 x 2 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	5.4	TSSOP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
	5.5	MiniSO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
6	Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		21
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		22

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LM2904, LM2904A	Schematic diagram

1 Schematic diagram

Figure 1.	Schematic diagram (1/2 LM2904)
					VCC
			6 ΜA	4	ΜA	100 ΜA
						Q5
			CC			Q6
	Inverting	Q2	Q3			Q7
	input	Q1	Q4
						RSC
Non-inverting						Q11
	input					Output
						Q13
					Q10	Q12
		Q8	Q9			50 mA
						GND

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Absolute maximum ratings and operating conditions	LM2904, LM2904A

2 Absolute maximum ratings and operating conditions

Table 1.	Absolute maximum ratings
Symbol		Parameter	Value	Unit
VCC	Supply voltage (1)		±16 or 32	V
Vid	Differential input voltage(2)		±32	V
Vin	Input voltage		-0.3 to 32	V
	Output short-circuit duration (3)		Infinite	s
	Input current	(4): V driven negative	5 mA in DC or 50 mA in AC
		in	(duty cycle = 10%, T = 1s)
Iin				mA
	Input current	(5): V driven positive above AMR value	0.4
		in
Toper	Operating free-air temperature range		-40 to +125	°C
Tstg	Storage temperature range		-65 to +150	°C
Tj	Maximum junction temperature		150	°C
	Thermal resistance junction to ambient(6)
	SO-8		125
Rthja	TSSOP8		120	°C/W
	DIP8		85
	MiniSO-8		190
	DFN8 2x2		57
	Thermal resistance junction to case(6)
Rthjc	SO-8		40	°C/W
	TSSOP8		37
	DIP8		41
	MiniSO-8		39
	HBM: human body model(7)		300	V
ESD	MM: machine model(8)		200	V
	CDM: charged device model(9)		1.5	kV

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 short-circuits 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 clamp. In addition to this diode action, there is 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.The junction base/substrate of the input PNP transistor polarized in reverse must be protected by a resistor in series with the inputs to limit the input current to 400 µA max (R = (Vin-32 V)/400 µA).

6.Short-circuits can cause excessive heating and destructive dissipation. Values are typical.

7.Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.

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

9.Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.

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LM2904, LM2904A		Absolute maximum ratings and operating conditions
	Table 2.	Operating conditions
	Symbol	Parameter	Value	Unit
	VCC	Supply voltage	3 to 30	V
	Vicm	Common mode input voltage range	0 to VCC+ - 1.5	V
	Toper	Operating free-air temperature range	-40 to +125	°C

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Electrical characteristics								LM2904, LM2904A
3	Electrical characteristics
Table 3.	VCC+ = 5 V, VCC- = ground, VO = 1.4 V, Tamb = 25° C
	(unless otherwise specified)
Symbol				Parameter		Min.	Typ.	Max.	Unit
	Input offset voltage (1)
Vio	Tamb = 25° C LM2904						2	7	mV
	Tamb		= 25° C LM2904A				1	2
	Tmin		≤ Tamb ≤ Tmax LM2904					9
	Tmin ≤ Tamb ≤ Tmax LM2904A							4
DVio	Input offset voltage drift						7	30	µV/°C
	Input offset current
Iio	Tamb		= 25° C				2	30	nA
	Tmin		≤ Tamb ≤ Tmax					40
DIio	Input offset current drift						10	300	pA/°C
	Input bias current (2)
Iib	Tamb		= 25° C				20	150	nA
	Tmin		≤ Tamb ≤ Tmax					200
	Large signal voltage gain
Avd	VCC+ = +15 V, RL = 2 kΩ, Vo = 1.4 V to 11.4 V								V/mV
	Tamb		= 25° C			50	100
	Tmin		≤ Tamb ≤ Tmax			25
SVR	Supply voltage rejection ratio (RS ≤10 kΩ)								dB
	Tamb		= 25° C			65	100
	Tmin		≤ Tamb ≤ Tmax			65
	Supply current, all amp, no load
ICC	T	amb	= 25°C, V	= +5 V			0.7	1.2	mA
			CC+
	Tmin		≤ Tamb ≤ Tmax, VCC+ = +30 V					2
	Input common mode voltage range (V				= +30 V) (3)
Vicm				CC+					V
	Tamb		= 25° C			0		VCC+ -1.5
	Tmin		≤ Tamb ≤ Tmax			0		VCC+ -2
CMR	Common-mode rejection ratio (RS = 10 kΩ)								dB
	Tamb		= 25° C			70	85
	Tmin		≤ Tamb ≤ Tmax			60
Isource	Output short-circuit current					20	40	60	mA
	VCC+ = +15 V, Vo = +2 V, Vid = +1 V
	Output sink current
Isink	VO = 2 V, VCC+ = +5 V					10	20		mA
	VO = +0.2 V, VCC+ = +15 V					12	50		µA
	High level output voltage (VCC+ = + 30 V)
VOH	Tamb		= +25° C, RL = 2 kΩ			26			V
	Tmin		≤ Tamb ≤ Tmax			26	27
	Tamb		= +25° C, RL	= 10 kΩ		27
	Tmin		≤ Tamb ≤ Tmax			27	28

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LM2904, LM2904A			Electrical characteristics
Table 3.	VCC+ = 5 V, VCC- = ground, VO = 1.4 V, Tamb = 25° C
	(unless otherwise specified) (continued)
Symbol	Parameter	Min.	Typ.	Max.	Unit
VOL	Low level output voltage (RL = 10 kΩ)				mV
	Tamb = +25° C		5	20
	Tmin ≤ Tamb ≤ Tmax			20
	Slew rate
SR	VCC+ = 15 V, Vin = 0.5 to 3 V, RL = 2 kΩ, CL =100 pF,	0.3	0.6		V/µs
	unity gain
	Tmin ≤ Tamb ≤ Tmax	0.2
GBP	Gain bandwidth product f = 100 kHz	0.7	1.1		MHz
	VCC+ = 30 V, Vin = 10 mV, RL = 2 kΩ, CL = 100 pF
	Total harmonic distortion
THD	f = 1 kHz, AV = 20 dB, RL = 2 kΩ, Vo = 2 Vpp,		0.02		%
	CL = 100 pF, VCC+ = 30 V
en	Equivalent input noise voltage		55		nV/√Hz
	f = 1 kHz, RS = 100 Ω, VCC+ = 30 V
VO1/VO2	Channel separation (4)		120		dB
	1 kHz ≤ f ≤ 20 kHz

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.The input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3 V.

The upper end of the common-mode voltage range is VCC+ –1.5 V, but either or both inputs can go to +32 V without damage.

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

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Electrical characteristics	LM2904, LM2904A
Figure 2. Open-loop frequency response	Figure 3. Large signal frequency response

	140						10MΩ
	120				0.1μF
(dB)	100				VI	VCC/2	-	VCC		VO	(Vpp)
GAINVOLTAGE	20	VCC = +10 to + 15V &					+				SWINGOUTPUT
	80
						VCC = 30V &
	60					-55°C	Tamb		+125°C
	40
	0	-55°C		Tamb	+125°C
		1.0	10	100	1k	10k	100k		1M	10M

FREQUENCY (Hz)

20
			100k Ω
	1k Ω	-	+15V
			VO
15	VI
	+7V	+	2k Ω

10

5

0

1k

10k

100k

1M

FREQUENCY (Hz)

Figure 4. Voltage follower large signal	Figure 5. Current sinking output
response	characteristics

		4							10
														VCC = +5V
				RL	2 kΩ
	VOLTAGE(V)	3												VCC = +15V
OUTPUT				VCC = +15V
														VCC = +30V
							VOLTAGE(V)
		2								1
		1
		0													vcc
															vcc/2
		3					OUTPUT								-
									0.1								IO
	VOLTAGE(V)	2													+		VO
INPUT		1						0.01							Tamb = +25°C
		0	10	20	30	40				0,001		0,01		0,1	1	10	100
				TIME (μs)						OUTPUT SINK CURRENT (mA)
Figure 6. Voltage follower small signal							Figure 7. Current sourcing output
		response								characteristics
													L
				L

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