LM2904双运动放大器

15 May 2020 - 0 Comments

LM2904 Dual-Operational Amplifier

LM2904 PINOUT

TheLM2904 ICconsists of two independent, high gain, internally frequency compensated operational amplifiers. LM2904 IC is specifically designed to operate from a single power supply over a wide range of voltages.

LM2904 PINOUT配置

Pin Number	Pin Name	Description
1	OUTPUT A	Output of Op-Amp A
2	输入A-	Inverting Input of Op-Amp A
3	输入a+	Non-Inverting Input of Op-Amp A
4	GND	Ground or Negative Supply Voltage
5	输入B+	Non-Inverting Input of Op-Amp B
6	INPUT B-	Inverting Input of Op-Amp B
7	OUTPUT B	Output of Op-Amp B
8	V_CC	Positive Supply Voltage

LM2904 features and specifications

电源电压：3V至26 V
Operating Supply Current: 250uA
Output Current per Channel: 30 mA
CMRR - Common Mode Rejection Ratio: 70 dB
IB-输入偏置电流：250NA
Vos - Input Offset Voltage: 7 mV
PSRR - Power Supply Rejection Ratio: 50 dB
Large DC Voltage Gain: 100 dB
Wide Bandwidth (Unity Gain): 1 MHz
Available in 8-Bump DSBGA Chip-Sized Package

Note:Complete Technical Details can be found at theLM2904 datasheetgiven at the end of this page.

Alternatives Dual Op-Amp IC

LM358, MCP602,RC4558,NE5532, OPA2228, OPA2134 and OPA2604

Where to Use LM2904 IC

The LM2904 is a Dual package version of the commonly usedLM741 Op-Amp，两个IC具有相同的电气特性。此操作AMP没有闩锁问题，因此是在电压跟随器应用中使用的理想选择。它还具有内部频率补偿和内置的短路保护，因此需要准备好最少的组件。Because of these characteristics, these ICs are commonly found inside DVD players and Guitar amplifiers.

LM2904 IC consume very low current. So if you are looking for an Op-amp IC with all these characteristics, then this IC might be right choice for you.

How to Use LM2904 IC

As mentioned earlier this IC requires minimum number of components to be application ready. A high input impedance non-inverting application circuit diagram fromLM2904 IC datasheetis shown below.

LM2904应用电路

Input supply is given at the non-inverting pin while inverting pin is connected to ground through a 10k resistor. This circuit gives a closed-loop gain equal to the ratio of the sum of R1 and R2 to R1 and a closed-loop 3 dB bandwidth equal to the amplifier unity-gain frequency divided by the closed-loop gain. The gain of the circuit depends on the R1 and R2: