Datasheet

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General Description

The MAX4321 operational amplifier (op amp) combines

a 5MHz gain-bandwidth product and excellent DC

accuracy with Rail-to-Rail

operation at both the inputs

and the output. This device requires only 650µA and

operates from either a single +2.4V to +6.5V supply or

dual ±1.2V to ±3.25V supplies, although the MAX4321

typically operates down to +1.8V (±0.9V). The

MAX4321 remains unity-gain stable with capacitive

loads up to 500pF and is capable of driving 250Ω loads

to within 200mV of either rail.

With rail-to-rail input common-mode range and output

swing, the MAX4321 is ideal for low-voltage, single-sup-

ply applications. In addition, low ±1.2mV input offset volt-

age and high 2V/µs slew rate make this device ideal for

signal-conditioning stages for precision, low-voltage data-

acquisition systems. The MAX4321 comes in a space-

saving 5-pin SOT23 package and is guaranteed over the

extended (-40°C to +85°C) temperature range.

The MAX4321 is a low-voltage, pin-for-pin compatible

upgrade for the LMC7101 that offers five-times higher

bandwidth, two-times faster slew rate, and about half the

input voltage noise density.

________________________Applications

Battery-Powered Instruments

Portable Equipment

Data-Acquisition Systems

Sensor and Signal Conditioning

Low-Power, Low-Voltage Applications

General-Purpose Low-Voltage Applications

Features

♦ Low-Voltage, Pin-for-Pin Upgrade for LMC7101

♦ Guaranteed +2.4V to +6.5V Single-Supply

Operation

♦ Typically Operates Down to +1.8V

♦ 5MHz Gain-Bandwidth Product

♦ 650µA Quiescent Current

♦ Rail-to-Rail Common-Mode Input Voltage Range

♦ Rail-to-Rail Output Voltage Range

♦ Drives 250Ω Loads

♦ Unity-Gain Stable for Capacitive Loads up to

500pF

♦ No Phase Reversal for Overdriven Inputs

♦ Low-Cost Solution in SOT23-5 Package

MAX4321

Low-Cost, Low-Voltage, Rail-to-Rail,

Input/Output, SOT23 5MHz Op Amp

________________________________________________________________ Maxim Integrated Products 1

IN-IN+

15V

OUT

MAX4321

TOP VIEW

SOT23

MAX187

MAX4321

SHDN

+5V

AIN

VREF

GND

DOUT

SERIAL

INTERFACE

SCLK

Typical Operating Circuit

19-1649; Rev 0; 4/00

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

Ordering Information

Pin Configuration/

Functional Diagram

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

PART

TEMP.

RANGE

PIN-

PACKAGE

TOP

MARK

MAX4321EUK-T -40°C to +85°C

5 SOT23-5

ADOA

Summary of content (12 pages)

PAGE 1
9-1649; Rev 0; 4/00 Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp The MAX4321 operational amplifier (op amp) combines a 5MHz gain-bandwidth product and excellent DC accuracy with Rail-to-Rail® operation at both the inputs and the output. This device requires only 650µA and operates from either a single +2.4V to +6.5V supply or dual ±1.2V to ±3.25V supplies, although the MAX4321 typically operates down to +1.8V (±0.9V).
PAGE 2
MAX4321 Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ....................................-0.3V to +7V All Other Pins ..................................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration.....................................Continuous (short to either supply) Continuous Power Dissipation (TA = +70°C) 5-pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW Operating Temperature Range .......................
PAGE 3
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp (VCC = +5.0V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = ∞ connected to VCC/2, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER Supply Voltage Range SYMBOL CONDITIONS VCC - VEE MIN 2.4 Supply Current ICC VCM = VOUT = VCC/2 Input Offset Voltage VOS VCM = VEE or VCC Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Common-Mode Input Voltage Range TYP MAX UNITS 6.
PAGE 4
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321 Typical Operating Characteristics (VCC = +5V, VEE = 0, VCM = VCC/2, TA = +25°C, unless otherwise noted.) GAIN AND PHASE vs. FREQUENCY (WITH CLOAD) MAX4321-02 60 180 0 0 -36 PHASE 20 36 0 0 -108 AV = +1000 NO LOAD 1k -144 10k 100k 1M -40 100 -180 100M 10M 1k 1 0.1 0.01 1k 10k 100k 1M 10M 10M 10 1k 10k 100k 1M 10M 100M SUPPLY CURRENT vs. TEMPERATURE INPUT OFFSET VOLTAGE vs.
PAGE 5
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE 250 150 VCC = 2.7V, RL = 500Ω 100 VCC = 6.5V, RL = 100kΩ RL = 100kΩ 100 200 VCC = 2.7V, RL = 500Ω 150 RL = 10kΩ RL = 2kΩ 90 RL = 500Ω 80 100 50 VCC = 2.7V RL TO VEE 110 VCC = 6.5V, RL = 500Ω GAIN (dB) VCC - VOUT (mV) VOUT - VEE (mV) RL TO VEE VCC = 6.5V, RL = 500Ω 120 MAX4321-11 RL TO VCC 200 300 MAX4321-10 250 LARGE-SIGNAL GAIN vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = VCC/2, TA = +25°C, unless otherwise noted.) 0.025 0.020 0.015 MAX4321-20 AV = +1 10kHz SINE WAVE RL TO VCC / 2 500kHz LOWPASS FILTER 0.01 SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING) AV = +1 IN VOLTAGE 50mV/div RL = 2kΩ RL = 250Ω 0.010 OUT RL = 10kΩ 0.005 RL = 100kΩ 0.001 0 1k 10k FREQUENCY (Hz) 4.0 100k 4.4 4.6 4.8 200ns/div 5.
PAGE 7
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp Rail-to-Rail Input Stage The MAX4321 high-speed amplifier has rail-to-rail input and output stages designed for low-voltage, singlesupply operation. The input stage consists of separate NPN and PNP differential stages, which combine to provide an input common-mode range extending to the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail.
PAGE 8
Rail-to-Rail Output Stage The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (VEE). Figure 3 shows the input voltage range and output voltage swing of a MAX4321 connected as a voltage follower. With a +3V supply and the 100kΩ load tied to ground, the output swings from 0.02V to 2.97V. The maximum output voltage swing depends on the load but will be within 300mV of a +5V supply, even with the maximum load (250Ω to ground).
PAGE 9
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp Power Supplies and Layout The MAX4321 operates from single +2.4V to +6.5V or dual ±1.2V to ±3.25V supplies, though it typically operates down to +1.8V (±0.9V). For single-supply operation, bypass the power supply with a 0.1µF ceramic capacitor in parallel with at least 1µF. For dual supplies, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance at the op amp’s inputs and outputs.
PAGE 10
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp SOT-23 5L .
PAGE 11
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp ______________________________________________________________________________________ MAX4321 NOTES 11
PAGE 12
MAX4321 Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp NOTES Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.