ST LM2904, LM2904A User Manual

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 (V

CC+

-1.5 V)

Description

LM2904, LM2904A

Low-power dual operational amplifier

N

DIP8

(Plastic package)

D

SO-8

(Plastic micropackage)

P

TSSOP8

(Thin shrink small outline package)

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.

S

MiniSO-8

Q2

DFN8 2 x 2 mm

(Plastic micropackage)

Pin connections (top view)

January 2012 Doc ID 2471 Rev 14 1/24

www.st.com

24

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

2/24 Doc ID 2471 Rev 14

LM2904, LM2904A Schematic diagram

1 Schematic diagram

Figure 1. Schematic diagram (1/2 LM2904)

V

CC

Inverting

input

Non-inverting

input

Q2

Q8 Q9

6MA

Q3

M

4

A

C

Q4Q1

Q11

100

A

M

Q5

Q6

Q7

R

SC

Output

Q13

Q10

Q12

50 mA

GND

Doc ID 2471 Rev 14 3/24

Absolute maximum ratings and operating conditions LM2904, LM2904A

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

Supply voltage

CC

Differential input voltage

id

Input voltage -0.3 to 32 V

in

Output short-circuit duration

Input current

I

in

Input current

T

oper

T

Operating free-air temperature range -40 to +125 °C

Storage temperature range -65 to +150 °C

stg

Maximum junction temperature 150 °C

j

Thermal resistance junction to ambient

SO-8

R

thja

TSSOP8 DIP8 MiniSO-8 DFN8 2x2

Thermal resistance junction to case

SO-8

R

thjc

TSSOP8 DIP8 MiniSO-8

HBM: human body model

ESD

MM: machine model

CDM: charged device model

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 V approximately 40 mA, independent of the magnitude of V 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 Opamps to go to the V 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.

CC

(1)

(2)

(3)

(4)

: Vin driven negative

5 mA in DC or 50 mA in AC

±16 or 32 V

±32 V

Infinite s

(duty cycle = 10%, T = 1s)

(5)

: Vin driven positive above AMR value

(6)

0.4

125 120

85

190

57

(6)

40 37 41 39

(7)

(8)

(9)

can cause excessive heating if V

CC

.

> 15 V. The maximum output current is

cc+

voltage level (or to ground for a large overdrive) for the time during which an input is driven negative.

300 V

200 V

1.5 kV

mA

°C/W

4/24 Doc ID 2471 Rev 14

LM2904, LM2904A Absolute maximum ratings and operating conditions

Table 2. Operating conditions

Symbol Parameter Value Unit

T

V

CC

icm

oper

Supply voltage 3 to 30 V

Common mode input voltage range 0 to V

- 1.5 V

CC+

Operating free-air temperature range -40 to +125 °C

Doc ID 2471 Rev 14 5/24

Electrical characteristics LM2904, LM2904A

3 Electrical characteristics

Table 3. V

Symbol Parameter Min. Typ. Max. Unit

V

DV

I

io

DI

I

ib

A

SVR

I

CC

V

icm

CMR

I

source

I

sink

V

OH

CC+

= 5 V, V

= ground, VO = 1.4 V, T

CC-

amb

= 25° C

(unless otherwise specified)

≤ T ≤ T

≤ T

CC+

≤ T

(1)

max

(2)

max

CC+

max

= +5 V

CC+

max

LM2904 LM2904A

= +5 V

, V

= +30 V

CC+

= +15 V

CC+

≤10 kΩ)

S

CC+

= 10 kΩ)

S

= + 30 V)

= +30 V)

(3)

2 1

230

40

20 150

200

50

100

25

65

100

65

0.7 1.2

70

0 0

85

V

CC+

V

CC+

60

20 40 60 mA

10 12

20 50

26 26

27 27 27

28

Input offset voltage

= 25° C LM2904

T

amb

T

io

= 25° C LM2904A

amb

T

≤ T

min

≤ T

amb

T

Input offset voltage drift 7 30 µV/°C

Input offset current

= 25° C

T

amb

T

≤ T

min

amb

Input offset current drift 10 300 pA/°C

io

Input bias current

T

= 25° C

amb

T

≤ T

min

amb

Large signal voltage gain V

= +15 V, RL=2kΩ, Vo = 1.4 V to 11.4 V

vd

CC+

T T

amb

min

≤ T

= 25° C

amb

Supply voltage rejection ratio (R

= 25° C

T

amb

T

≤ T

min

amb

Supply current, all amp, no load

T

= 25°C, V

amb

≤ T

T

min

amb

Input common mode voltage range (V

T

= 25° C

amb

T

≤ T

min

amb

Common-mode rejection ratio (R

= 25° C

T

amb

≤ T

T

min

amb

Output short-circuit current

V

= +15 V, Vo = +2 V, Vid = +1 V

CC+

Output sink current

VO = 2 V, V

= +0.2 V, V

V

O

High level output voltage (V

= +25° C, RL = 2kΩ

T

amb

T

≤ T

min

T T

amb

= +25° C, RL = 10 kΩ

amb

≤ T

min

amb

7 2

9 4

2

-1.5

-2

mV

nA

V/mV

dB

mA

V

dB

mA

µA

V

6/24 Doc ID 2471 Rev 14

LM2904, LM2904A Electrical characteristics

Table 3. V

CC+

= 5 V, V

= ground, VO = 1.4 V, T

CC-

amb

= 25° C

(unless otherwise specified) (continued)

Symbol Parameter Min. Typ. Max. Unit

Low level output voltage (RL = 10 kΩ)

V

OL

T T

amb

min

= +25° C

≤ T

amb

≤ T

max

520

20

Slew rate

= 15 V, Vin = 0.5 to 3 V, RL = 2kΩ, CL =100 pF,

V

SR

GBP

CC+

unity gain T

≤ T

amb

≤ T

max

min

Gain bandwidth product f = 100 kHz

= 30 V, Vin = 10 mV, RL = 2kΩ, CL = 100 pF

V

CC+

0.3

0.6

0.2

0.7 1.1 MHz

Total harmonic distortion

THD

e

VO1/V

n

f = 1 kHz, A

= 100 pF, V

C

L

Equivalent input noise voltage f=1kHz, R

Channel separation

O2

1kHz ≤ f ≤ 20 kHz

1. VO = 1.4 V, RS = 0 Ω, 5 V < 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.

= 20 dB, RL = 2 kΩ, Vo = 2 Vpp,

V

= 30 V

CC+

=100Ω, V

S

(4)

CC+

=30V

CC+

< 30 V, 0 V < Vic < V

CC+

- 1.5 V.

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 V 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.

–1.5 V, but either or both inputs can go to +32 V without

CC+

0.02 %

55

120 dB

mV

V/µs

nV/

√Hz

Doc ID 2471 Rev 14 7/24

Electrical characteristics LM2904, LM2904A

Figure 2. Open-loop frequency response Figure 3. Large signal frequency response

140

120

100

0.1μF

V

I

VCC/2

80

VCC= 30V &

T

60

-55°C

40

VOLTAGE GAIN (dB)

20

VCC= +10 to + 15V &

T

amb

+125°C

-55°C

0

1.0 10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

Figure 4. Voltage follower large signal

response

4

3

2

OUTPUT

VOLTAGE (V)

1

0

3

2

1

INPUT

010203040

VOLTAGE (V)

(

E

M

T

I

μ

Figure 6. Voltage follower small signal

response

500

e

l

Output

+

-

TIME (ms)

50pF

Input

450

400

350

OUTPUT VOLTAGE (mV)

300

250

0 1 2 3 4 5 6 7 8

10M

Ω

V

-

CC

+

+125°C

amb

RL 2 k VCC = +15V

)

s

e

O

T

= +25°C

amb

VCC= 30 V

V

O

Figure 5. Current sinking output

Ω

Figure 7. Current sourcing output

20

Ω

1k

-

15

V

I

+

+7V

10

5

OUTPUT SWING (Vpp)

0

1k 10k 100k 1M

FREQUENCY (Hz)

characteristics

10

1

VOLTAGE (V)

0.1

OUTPUT

0.01

0,001 0,01 0,1 1 10 100

OUTPUT SINK CURRENT (mA)

VCC = +5V VCC = +15V VCC = +30V

vcc/2

-

+

T

characteristics

8

7

VCC/2

6

(V)

5

+

CC

4

TO V

OUTPUT VOLTAGE REFERENCED

Independent of V

3

T

2

amb

1

0,01 0,1 1 10 100

0,001

OUTPUT SOURCE CURRENT (mA)

+

-

= +25°C

V

CC

I

O

CC

amb

V

100k

v

cc

O

Ω

+15V

Ω

2k

= +25°C

VO

I

O

V

O

8/24 Doc ID 2471 Rev 14