Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp Multi-purpose uMAX 8

General Description

The MAX4240–MAX4244 family of micropower op amps

operate from a single +1.8V to +5.5V supply or dual

±0.9V to ±2.75V supplies and have Beyond-the-Rails™

inputs and rail-to-rail output capabilities. These ampli-

fiers provide a 90kHz gain-bandwidth product while

using only 10µA of supply current per amplifier. The

MAX4241/MAX4243 have a low-power shutdown mode

that reduces supply current to less than 1µA and forces

the output into a high-impedance state. Although the

minimum operating voltage is specified at +1.8V, these

devices typically operate down to +1.5V. The combina-

tion of ultra-low-voltage operation, beyond-the-rails

inputs, rail-to-rail outputs, and ultra-low power con-

sumption makes these devices ideal for any portable/

two-cell battery-powered system.

These amplifiers have an input common-mode range

that extends 200mV beyond each rail, and their out-

puts typically swing to within 9mV of the rails with a

100kΩ load. Beyond-the-rails input and rail-to-rail out-

put characteristics allow the full power-supply voltage

to be used for signal range. The combination of low

input offset voltage, low input bias current, and high

open-loop gain makes them suitable for low-power/low-

voltage precision applications.

The MAX4240 is offered in a space-saving 5-pin

SOT23 package. All specifications are guaranteed

over the -40°C to +85°C extended temperature range.

Applications

Features

♦ Ultra-Low-Voltage Operation:

Guaranteed Down to +1.8V

Typical Operation to +1.5V

♦ Ultra-Low Power Consumption:

10µA Supply Current per Amplifier

1µA Shutdown Mode (MAX4241/MAX4243)

Up to 200,000 Hours Operation from Two AA

Alkaline Cells

♦ Beyond-the-Rails Input Common-Mode Range

♦ Outputs Swing Rail-to-Rail

♦ No Phase Reversal for Overdriven Inputs

♦ 200µV Input Offset Voltage

♦ Unity-Gain Stable for Capacitive Loads up to 200pF

♦ 90kHz Gain-Bandwidth Product

♦ Available in Space-Saving 5-Pin SOT23 and

8-Pin µMAX

Packages

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

OUT 1 5 V

MAX4240

IN+ 3 4 IN-

SOT23-5

Pin Configurations

Ordering Information

19-1343; Rev 3; 9/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Two-Cell Battery-

Powered Systems

Portable/Battery-Powered

Electronic Equipment

Digital Scales

Strain Gauges

Sensor Amplifiers

Cellular Phones

Notebook Computers

PDAs

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4240EUK-T -40°C to +85°C 5 SOT23-5 ACCS

MAX4241EUA -40°C to +85°C 8 µMAX —

MAX4241ESA -40°C to +85°C 8 SO —

MAX4242EUA -40°C to +85°C 8 µMAX —

MAX4242ESA -40°C to +85°C 8 SO —

MAX4243EUB -40°C to +85°C 10 µMAX —

MAX4243ESD -40°C to +85°C 14 SO —

MAX4244ESD -40°C to +85°C 14 SO —

Selector Guide

PART

NO. OF

AMPS

SHUTDOWN PIN-PACKAGE

MAX4240 1 — 5-pin SOT23

MAX4241 1 Yes 8-pin µMAX/SO

MAX4242 2 — 8-pin µMAX/SO

MAX4243 2 Yes

10-pin µMAX,

14-pin SO

MAX4244 4 — 14-pin SO

Beyond-the-Rails is a trademark and µMAX is a registered

trademark of Maxim Integrated Products, Inc.

Pin Configurations continued at end of data sheet.

Summary of content (16 pages)

PAGE 1
9-1343; Rev 3; 9/06 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps Features The MAX4240–MAX4244 family of micropower op amps operate from a single +1.8V to +5.5V supply or dual ±0.9V to ±2.75V supplies and have Beyond-the-Rails™ inputs and rail-to-rail output capabilities. These amplifiers provide a 90kHz gain-bandwidth product while using only 10µA of supply current per amplifier.
PAGE 2
MAX4240–MAX4244 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ....................................................6V All Other Pins ...................................(VCC + 0.3V) to (VEE - 0.3V) Output Short-Circuit Duration (to VCC or VEE)............Continuous Continuous Power Dissipation (TA = +70°C) 5-pin SOT23 (derate 7.1mW/°C above +70°C).............571mW 8-pin µMAX (derate 4.1mW/°C above +70°C) ..............
PAGE 3
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Power-Supply Rejection Ratio PSRR Large-Signal Voltage Gain AVOL Output Voltage Swing High VOH Output Voltage Swing Low VOL Output Short-Circuit Current IOUT(SC) Output Leakage Current in Shutdown (Notes 2, 5) CONDITIONS 1.8V ≤ VCC ≤ 5.5V (VEE + 0.2V) ≤ VOUT ≤ (VCC - 0.
PAGE 4
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240–MAX424 ELECTRICAL CHARACTERISTICS (continued) (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage-Noise Density en f = 1kHz 70 nV/√Hz Input Current-Noise Density in f = 1kHz 0.
PAGE 5
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = TMIN to TMAX, unless oth erwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS VCC = 1.8V Common-Mode Rejection Ratio (Note 4) CMRR VCC = 5.
PAGE 6
ELECTRICAL CHARACTERISTICS (continued) (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = TMIN to TMAX, unless oth erwise noted.) (Note 1) PARAMETER SYMBOL SHDN Logic High (Note 2) VIH SHDN Input Bias Current (Note 2) IIH, IIL CONDITIONS MIN TYP MAX UNITS 0.7 x VCC V 120 SHDN = VCC = 5.5V or SHDN = VEE = 0 nA Note 1: The MAX4240EUK, MAX4241EUA, MAX4242EUA, and MAX4243EUB specifications are 100% tested at TA = +25°C.
PAGE 7
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps 0 -2.5 RL TO VEE 100 VCC = +1.8V, RL = 10kΩ 80 60 VCC = +5.5V, RL = 20kΩ 40 1.5 0.5 2.5 3.5 4.5 -60 -20 40 20 0 60 VCC = +1.8V, RL = 10kΩ VCC = +5.5V, RL = 100kΩ VCC = +1.8V, RL = 100kΩ 0 80 100 -60 -40 -20 20 0 40 60 100 COMMON-MODE REJECTION vs. TEMPERATURE OPEN-LOOP GAIN vs. OUTPUT SWING LOW (VCC = +1.8V, RL TIED TO VEE) OPEN-LOOP GAIN vs. OUTPUT SWING HIGH (VCC = +1.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +5.0V, VEE = 0, VCM = VCC/2, V SHDN = VCC, RL = 100kΩ to VCC/2, TA = +25°C unless otherwise noted.) VCC = +1.8V, RL TO VEE 85 VCC = +1.8V, RL TO VCC 80 108 40 108 72 30 72 20 36 10 0 0 -10 -20 20 36 10 0 0 -36 -72 -10 -72 -108 -20 -108 -144 -36 -30 -144 -30 70 -40 -180 -40 -40 0 -20 20 40 60 80 100 10 100 1k 10k 1k MAX4242/MAX4243/MAX4244 CROSSTALK vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 9
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps Pin Description _______________________________________________________________________________________ 9 MAX4240–MAX4244 Typical Operating Characteristics (continued) (VCC = +5.0V, VEE = 0, VCM = VCC/2, V SHDN = VCC, RL = 100kΩ to VCC/2, TA = +25°C unless otherwise noted.
PAGE 10
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240–MAX424 _______________Detailed Description Beyond-the-Rails Input Stage The MAX4240–MAX4244 have Beyond-the-Rails inputs and rail-to-rail output stages that are specifically designed for low-voltage, single-supply operation. The input stage consists of separate NPN and PNP differen tial stages, which operate together to provide a com mon-mode range extending to 200mV beyond both supply rails.
PAGE 11
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240–MAX4244 In the region where the differential input voltage approaches 1.8V, the input resistance decreases expo nentially from 45MΩ to 4.4kΩ as the diode block begins conducting. Conversely, the bias current increases with the same curve. MAX4240-44 fig03 RL = 100kΩ TIED TO VEE VIN = 2.
PAGE 12
Table 1. MAX4240/MAX4241 Characteristics with Typical Battery Systems RECHARGEABLE VFRESH (V) VEND-OF-LIFE (V) CAPACITY, AA SIZE (mA-h) MAX4240/MAX4241 OPERATING TIME IN NORMAL MODE (Hours) MAX4241 OPERATING TIME IN SHUTDOWN MODE (Hours) Alkaline (2 Cells) No 3.0 1.8 2000 200,000 2 x 106 NickelCadmium (2 Cells) Yes 2.4 1.8 750 75,000 0.75 x 106 Lithium-Ion (1 Cell) Yes 3.5 2.7 1000 100,000 106 Nickel-MetalHydride (2 Cells) Yes 2.4 1.
PAGE 13
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps RL = 1.8V - 0.1V = 7kΩ to VEE 240µA and VEE supplies should be bypassed to ground with separate 100nF capacitors. Good PC board layout techniques optimize perfor mance by decreasing the amount of stray capacitance at the op amp’s inputs and output. To decrease stray capacitance, minimize trace lengths by placing exter nal components as close as possible to the op amp. Surface-mount components are an excellent choice.
PAGE 14
Using the MAX4240–MAX4244 as Comparators Although optimized for use as operational amplifiers, the MAX4240–MAX4244 can also be used as rail-to-rail I/O comparators. Typical propagation delay depends on the input overdrive voltage, as shown in Figure 9. External hysteresis can be used to minimize the risk of output oscillation. The positive feedback circuit, shown in Figure 10, causes the input threshold to change when the output voltage changes state.
PAGE 15
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240/MAX4241 TRANSISTOR COUNT: 234 R1 VCC MAX4242/MAX4243 TRANSISTOR COUNT: 466 R2 MAX4244 TRANSISTOR COUNT: 932 SUBSTRATE CONNECTED TO VEE Q1 VOUT R3 MAX4240 VEE Figure 11. Current Monitor for a 2-Cell Battery Stack _____________________________________________Pin Configurations (continued) TOP VIEW N.C. 1 IN- 2 8 SHDN 7 VCC MAX4241 3 6 OUT VEE 4 5 N.C.
PAGE 16
Tape-and-Reel Information D P0 W P2 B0 t D1 F P NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. K0 A0 A0 3.200 ±0.102 E 1.753 ±0.102 P0 B0 3.099 ±0.102 F 3.505 ±0.051 P010 40.005 ±0.203 D 1.499 +0.102 +0.000 K0 1.397 ±0.102 P2 2.007 ±0.051 3.988 ±0.102 t 0.254 ±0.127 0.991 +0.254 +0.000 P D1 8.001 +0.305 -0.102 W 3.988 ±0.