8

REV A.02

www.3peakic.com.cn

LMV321TP/LMV358TP/LMV324TP

40μA, 1.27MHz, Micro-Power Rail-to-Rail I/O Op Amps

Pin Functions

+IN: Non-Inverting Input of Amplifier. This pin has

the same voltage range as

–IN.

from 2.1V to 5.25V. Split supplies are possible as

long as the voltage between V+ and V

– is between

2.1V and 5.25V. A

bypass capacitor of 0.1μF as

close to the part as possible should be used

between power supply pins or between supply pins

and ground.

ground. It can also be tied to a voltage other than

from 2.1V to 5.25V. If it is not connected to ground,

bypass it with a capacitor

of 0.1μF as close to the

part as possible.

OUT: Amplifier Output. The voltage range extends

to within millivolts of each supply rail.

The exposed thermal pad of DFN package should

be left floated.

Operation

The LMV321TP/358TP/324TP input signal range

extends beyond the negative and positive power

supplies. The output can even extend all the way to

the negative supply. The input stage is comprised

of two CMOS differential amplifiers, a PMOS stage

and NMOS stage that are active over different

ranges of common mode input voltage. The

Class-AB control buffer and output bias stage uses

a proprietary compensation technique to take full

advantage of the process technology to drive very

high capacitive loads. This is evident from the

transient over shoot measurement plots in the

Typical Performance Characteristics.

Applications Information

Low Supply Voltage and Low Power Consumption

The LMV321TP/358TP/324TP of operational amplifiers can operate with power supply voltages from 2.1V to 6.0V.

Each amplifier draws only 40

μA quiescent current. The low supply voltage capability and low supply current are

ideal for portable applications demanding HIGH CAPACITIVE LOAD DRIVING CAPABILITY and WIDE

BANDWIDTH. The LMV321TP/358TP/324TP is optimized for wide bandwidth low power applications. They have

an industry leading high GBWP to power ratio and are unity gain stable for ANY CAPACITIVE load. When the

load capacitance increases, the increased capacitance at the output pushed the non-dominant pole to lower

frequency in the open loop frequency response, lowering the phase and gain margin. Higher gain configurations

tend to have better capacitive drive capability than lower gain configurations due to lower closed loop bandwidth

and hence higher phase margin.

Low Input Referred Noise

noise will grow slowly with the frequency in wideband range, and the input voltage noise is typically 5.6

frequency of 0.1Hz to 10Hz.

Low Input Offset Voltage

The LMV321TP/358TP/324TP has a low offset voltage of 3.5mV maximum which is essential for precision

applications. The offset voltage is trimmed with a proprietary trim algorithm to ensure low offset voltage for

precision signal processing requirement.

Low Input Bias Current

The LMV321TP/358TP/324TP is a CMOS OPA family and features very low input bias current in pA range.

The

low input bias current allows the amplifiers to be used in applications with high resistance sources.

Care must

be

taken to minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.