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 |
Doc ID 2471 Rev 14 |
1/24 |
www.st.com
Contents |
LM2904, LM2904A |
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Contents
1 |
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 3 |
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2 |
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . |
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3 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
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3.1 |
Typical single-supply applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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4 |
Macromodel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
13 |
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5 |
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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5.1 |
DIP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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5.2 |
SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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5.3 |
DFN8 2 x 2 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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5.4 |
TSSOP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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5.5 |
MiniSO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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6 |
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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7 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2/24 |
Doc ID 2471 Rev 14 |
LM2904, LM2904A |
Schematic diagram |
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Figure 1. |
Schematic diagram (1/2 LM2904) |
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VCC |
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6 ΜA |
4 |
ΜA |
100 ΜA |
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Q5 |
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CC |
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Q6 |
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Inverting |
Q2 |
Q3 |
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Q7 |
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input |
Q1 |
Q4 |
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RSC |
Non-inverting |
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Q11 |
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input |
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Output |
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Q13 |
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Q10 |
Q12 |
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Q8 |
Q9 |
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50 mA |
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GND |
Doc ID 2471 Rev 14 |
3/24 |
Absolute maximum ratings and operating conditions |
LM2904, LM2904A |
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Table 1. |
Absolute maximum ratings |
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Symbol |
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Parameter |
Value |
Unit |
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VCC |
Supply voltage (1) |
±16 or 32 |
V |
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Vid |
Differential input voltage(2) |
±32 |
V |
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Vin |
Input voltage |
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-0.3 to 32 |
V |
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Output short-circuit duration (3) |
Infinite |
s |
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Input current |
(4): V driven negative |
5 mA in DC or 50 mA in AC |
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in |
(duty cycle = 10%, T = 1s) |
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Iin |
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mA |
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Input current |
(5): V driven positive above AMR value |
0.4 |
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in |
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Toper |
Operating free-air temperature range |
-40 to +125 |
°C |
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Tstg |
Storage temperature range |
-65 to +150 |
°C |
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Tj |
Maximum junction temperature |
150 |
°C |
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Thermal resistance junction to ambient(6) |
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SO-8 |
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125 |
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Rthja |
TSSOP8 |
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120 |
°C/W |
DIP8 |
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85 |
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MiniSO-8 |
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190 |
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DFN8 2x2 |
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57 |
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Thermal resistance junction to case(6) |
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Rthjc |
SO-8 |
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40 |
°C/W |
TSSOP8 |
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37 |
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DIP8 |
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41 |
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MiniSO-8 |
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39 |
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HBM: human body model(7) |
300 |
V |
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ESD |
MM: machine model(8) |
200 |
V |
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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.
4/24 |
Doc ID 2471 Rev 14 |
LM2904, LM2904A |
Absolute maximum ratings and operating conditions |
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Table 2. |
Operating conditions |
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Symbol |
Parameter |
Value |
Unit |
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VCC |
Supply voltage |
3 to 30 |
V |
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Vicm |
Common mode input voltage range |
0 to VCC+ - 1.5 |
V |
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Toper |
Operating free-air temperature range |
-40 to +125 |
°C |
Doc ID 2471 Rev 14 |
5/24 |
Electrical characteristics |
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LM2904, LM2904A |
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3 |
Electrical characteristics |
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Table 3. |
VCC+ = 5 V, VCC- = ground, VO = 1.4 V, Tamb = 25° C |
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(unless otherwise specified) |
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Symbol |
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Parameter |
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Min. |
Typ. |
Max. |
Unit |
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Input offset voltage (1) |
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Vio |
Tamb = 25° C LM2904 |
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2 |
7 |
mV |
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Tamb |
= 25° C LM2904A |
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1 |
2 |
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Tmin |
≤ Tamb ≤ Tmax LM2904 |
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9 |
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Tmin ≤ Tamb ≤ Tmax LM2904A |
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4 |
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DVio |
Input offset voltage drift |
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7 |
30 |
µV/°C |
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Input offset current |
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Iio |
Tamb |
= 25° C |
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2 |
30 |
nA |
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Tmin |
≤ Tamb ≤ Tmax |
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40 |
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DIio |
Input offset current drift |
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10 |
300 |
pA/°C |
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Input bias current (2) |
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Iib |
Tamb |
= 25° C |
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20 |
150 |
nA |
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Tmin |
≤ Tamb ≤ Tmax |
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200 |
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Large signal voltage gain |
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Avd |
VCC+ = +15 V, RL = 2 kΩ, Vo = 1.4 V to 11.4 V |
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V/mV |
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Tamb |
= 25° C |
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50 |
100 |
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Tmin |
≤ Tamb ≤ Tmax |
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25 |
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SVR |
Supply voltage rejection ratio (RS ≤10 kΩ) |
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dB |
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Tamb |
= 25° C |
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65 |
100 |
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Tmin |
≤ Tamb ≤ Tmax |
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65 |
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Supply current, all amp, no load |
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ICC |
T |
amb |
= 25°C, V |
= +5 V |
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0.7 |
1.2 |
mA |
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CC+ |
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Tmin |
≤ Tamb ≤ Tmax, VCC+ = +30 V |
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2 |
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Input common mode voltage range (V |
= +30 V) (3) |
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Vicm |
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CC+ |
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V |
Tamb |
= 25° C |
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0 |
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VCC+ -1.5 |
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Tmin |
≤ Tamb ≤ Tmax |
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0 |
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VCC+ -2 |
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CMR |
Common-mode rejection ratio (RS = 10 kΩ) |
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dB |
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Tamb |
= 25° C |
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70 |
85 |
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Tmin |
≤ Tamb ≤ Tmax |
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60 |
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Isource |
Output short-circuit current |
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20 |
40 |
60 |
mA |
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VCC+ = +15 V, Vo = +2 V, Vid = +1 V |
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Output sink current |
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Isink |
VO = 2 V, VCC+ = +5 V |
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10 |
20 |
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mA |
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VO = +0.2 V, VCC+ = +15 V |
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12 |
50 |
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µA |
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High level output voltage (VCC+ = + 30 V) |
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VOH |
Tamb |
= +25° C, RL = 2 kΩ |
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26 |
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V |
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Tmin |
≤ Tamb ≤ Tmax |
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26 |
27 |
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Tamb |
= +25° C, RL |
= 10 kΩ |
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27 |
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Tmin |
≤ Tamb ≤ Tmax |
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27 |
28 |
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6/24 |
Doc ID 2471 Rev 14 |
LM2904, LM2904A |
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Electrical characteristics |
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Table 3. |
VCC+ = 5 V, VCC- = ground, VO = 1.4 V, Tamb = 25° C |
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(unless otherwise specified) (continued) |
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Symbol |
Parameter |
Min. |
Typ. |
Max. |
Unit |
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VOL |
Low level output voltage (RL = 10 kΩ) |
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mV |
Tamb = +25° C |
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5 |
20 |
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Tmin ≤ Tamb ≤ Tmax |
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20 |
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Slew rate |
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SR |
VCC+ = 15 V, Vin = 0.5 to 3 V, RL = 2 kΩ, CL =100 pF, |
0.3 |
0.6 |
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V/µs |
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unity gain |
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Tmin ≤ Tamb ≤ Tmax |
0.2 |
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GBP |
Gain bandwidth product f = 100 kHz |
0.7 |
1.1 |
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MHz |
VCC+ = 30 V, Vin = 10 mV, RL = 2 kΩ, CL = 100 pF |
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Total harmonic distortion |
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THD |
f = 1 kHz, AV = 20 dB, RL = 2 kΩ, Vo = 2 Vpp, |
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0.02 |
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CL = 100 pF, VCC+ = 30 V |
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en |
Equivalent input noise voltage |
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55 |
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nV/√Hz |
f = 1 kHz, RS = 100 Ω, VCC+ = 30 V |
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VO1/VO2 |
Channel separation (4) |
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120 |
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dB |
1 kHz ≤ f ≤ 20 kHz |
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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.
Doc ID 2471 Rev 14 |
7/24 |
Electrical characteristics |
LM2904, LM2904A |
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Figure 2. Open-loop frequency response |
Figure 3. Large signal frequency response |
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10MΩ |
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120 |
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0.1μF |
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(dB) |
100 |
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VI |
VCC/2 |
- |
VCC |
VO |
(Vpp) |
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GAINVOLTAGE |
20 |
VCC = +10 to + 15V & |
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SWINGOUTPUT |
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80 |
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VCC = 30V & |
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60 |
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-55°C |
Tamb |
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+125°C |
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40 |
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0 |
-55°C |
Tamb |
+125°C |
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1.0 |
10 |
100 |
1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz)
20 |
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100k Ω |
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1k Ω |
- |
+15V |
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VO |
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15 |
VI |
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+7V |
+ |
2k Ω |
10
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1k |
10k |
100k |
1M |
FREQUENCY (Hz)
Figure 4. Voltage follower large signal |
Figure 5. Current sinking output |
response |
characteristics |
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4 |
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10 |
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VCC = +5V |
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RL |
2 kΩ |
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VOLTAGE(V) |
3 |
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VCC = +15V |
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OUTPUT |
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VCC = +15V |
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VCC = +30V |
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VOLTAGE(V) |
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1 |
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1 |
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0 |
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vcc |
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vcc/2 |
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3 |
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OUTPUT |
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- |
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0.1 |
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IO |
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VOLTAGE(V) |
2 |
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+ |
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VO |
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INPUT |
1 |
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0.01 |
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Tamb = +25°C |
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0 |
10 |
20 |
30 |
40 |
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0,001 |
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0,01 |
0,1 |
1 |
10 |
100 |
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TIME (μs) |
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OUTPUT SINK CURRENT (mA) |
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Figure 6. Voltage follower small signal |
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Figure 7. Current sourcing output |
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response |
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characteristics |
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8/24 |
Doc ID 2471 Rev 14 |