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LF444CMX/NOPB

Quad JFET op-amp, 200uA/ch, 50pA Ibias, 1MHz, SOIC-14, LM148 pin-compatible, low power

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Manufacturer Part：

LF444CMX/NOPB

Package：

SOIC-14 (8.65 x 6.00 x 1.50 mm, D package)

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Description

Product Overview

The LF444CMX/NOPB from Texas Instruments is a quad low-power JFET-input operational amplifier in a SOIC-14 package. With 200uA max supply current per amplifier and 50pA max input bias current, it provides LM148-compatible AC performance at one-fourth the power consumption.

Key Specifications

Supply Current 200 uA/amplifier max (1/4 of LM148)
Input Bias Current 50 pA max
Gain Bandwidth 1 MHz
Slew Rate 1 V/us
Input Offset Voltage 5 mV max (LF444A)
Input Noise Voltage 35 nV/sqrtHz
Input Impedance 10^12 Ohm
Supply Voltage +/-18V (LF444), +/-22V (LF444A)
Operating Temperature 0C to +70C

Features

  • 1/4 supply current of LM148 at 200uA/amplifier max for low-power designs
  • 50pA max JFET input bias current, 10,000x lower than LM148
  • 1MHz GBW and 1V/us slew rate matching LM148 AC performance
  • 35nV/sqrtHz low noise voltage for a low-power amplifier
  • 10^12 Ohm high input impedance for sensor interfaces
  • Pin compatible with LM148 for direct power-saving upgrades

Applications

  • Low-power signal conditioning and instrumentation amplifiers
  • High-impedance sensor interface with 50pA input bias current
  • Portable instrument quad op-amp with 200uA/amplifier IQ
  • Battery-powered analog signal processing

The LF444CMX/NOPB from Texas Instruments is a quad low-power JFET-input operational amplifier in a SOIC-14 package. The LF444 provides many of the same AC characteristics as the industry-standard LM148 while greatly improving the DC characteristics and reducing power consumption to one-fourth that of the LM148. The amplifier has the same 1MHz gain bandwidth, 1V/us slew rate, and gain (10kOhm load) as the LM148, but draws only 200uA maximum supply current per amplifier compared to the LM148s approximately 800uA. The well-matched high-voltage JFET input devices reduce the input bias and offset currents by a factor of 10,000 over the LM148, providing 50pA maximum input bias current and 10^12 Ohm input impedance. The LF444 also has very low equivalent input noise voltage of 35nV/sqrtHz for a low-power amplifier. The device is pin compatible with the LM148, allowing an immediate 4x reduction in power drain in many applications. The LF444A grade provides tighter offset voltage (5mV max vs 10mV) and wider supply voltage range (+/-22V vs +/-18V).

The LF444CMX/NOPB uses a BI-FET (Bipolar-FET) process combining JFET input devices with bipolar output circuitry. (1) JFET Input Stage: Each amplifier uses a matched pair of P-channel JFETs at the input, providing the ultra-low 50pA input bias current and 10^12 Ohm input impedance. The JFET input pair also provides low noise operation at 35nV/sqrtHz. (2) Bipolar Gain and Output Stage: The bipolar transistors following the JFET input stage provide the voltage gain and output drive capability. The output stage can swing to within approximately 2V of each supply rail. (3) Low Power Design: The operating current of each amplifier is set to approximately 150uA by internal current sources, compared to about 600uA per amplifier in the LM148. Despite the lower current, the 1MHz GBW is maintained by the high transconductance of the JFET input pair. (4) Pin Compatibility: The internal circuit topology is designed to be pin-compatible with the LM148, with the same pinout for inverting input, non-inverting input, output, and power supply connections.

Pin Name Type Function
1 1OUT Output Amplifier 1 output
2 1IN- Input Amplifier 1 inverting input
3 1IN+ Input Amplifier 1 non-inverting input
4 V+ Power Positive supply
5 2IN+ Input Amplifier 2 non-inverting input
6 2IN- Input Amplifier 2 inverting input
7 2OUT Output Amplifier 2 output
8 3OUT Output Amplifier 3 output
9 3IN- Input Amplifier 3 inverting input
10 3IN+ Input Amplifier 3 non-inverting input
11 V- Power Negative supply
12 4IN+ Input Amplifier 4 non-inverting input
13 4IN- Input Amplifier 4 inverting input
14 4OUT Output Amplifier 4 output
  • Low-power signal conditioning and instrumentation amplifiers at 200uA/ch
  • High-impedance sensor interface with 50pA input bias current and 10^12 Ohm
  • Portable instrument quad op-amp with LM148-compatible AC performance
  • Battery-powered analog signal processing with 1/4 LM148 power consumption
Manufacturer Part Number Package Notes
TI LF444ACMX/NOPB SOIC-14 A grade, tighter offset
TI TL074CDR SOIC-14 3MHz, higher BW, higher IQ
TI TLV9304PWR TSSOP-14 40V, newer, lower noise
TI LF347MX/NOPB SOIC-14 4MHz, higher BW JFET quad
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