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MAX4198-MAX4199中文资料

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

________________________________________________________________Maxim Integrated Products

For free samples & the latest literature: https://www.sodocs.net/doc/8513680344.html,, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.

General Description

The MAX4198/MAX4199 low-power, Rail-to-Rail ?differ-ential amplifiers are ideal for single-supply applications that benefit from a low 0.01% gain error. The MAX4198is factory trimmed to a fixed gain of +1V/V, and the MAX4199 is trimmed to a fixed gain of +10V/V. Capable of operating from a single +2.7V to +7.5V supply or from dual ±1.35V to ±3.75V supplies, they consume only 42μA while achieving -3dB bandwidths of 175kHz (MAX4198) and 45kHz (MAX4199). These amplifiers feature a shutdown mode that reduces the supply cur-rent to 6.5μA.

The MAX4198/MAX4199 can drive 5k ?loads to within 100mV from each rail. The standard differential amplifi-er configurations provide common-mode rejection of 90dB for the MAX4198 and 110dB for the MAX4199.The input common-mode voltage range for the MAX4198 extends 100mV Beyond-the-Rails?.

The MAX4198/MAX4199 are offered in a space-saving 8-pin μMAX package. For complete micropower, rail-to-rail instrumentation amplifiers, see the MAX4194–MAX4197 data sheet.

Applications

Instrumentation Amplifier Building Block Differential Voltage Amplifiers Data-Acquisition Systems

Portable/Battery-Powered Equipment Transducer Interface Current-Sense Amplifiers

Features

o Low 0.01% Gain Error

o High Common-Mode Rejection: 110dB (MAX4199)o 10μV Input Offset Voltage (MAX4199)30μV Input Offset Voltage (MAX4198)o +2.7V to +7.5V Single-Supply Operation o 42μA Supply Current

o 175kHz (MAX4198) and 45kHz (MAX4199) -3dB Bandwidth o 6.5μA Shutdown Current

o Rail-to-Rail Outputs Drive 5k ?Loads

o Input Voltage Range Extends 100mV Beyond-the-Rails (MAX4198)o Available in Space-Saving 8-Pin μMAX Package

19-1445; Rev 0; 4/99

Pin Configuration

Ordering Information

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.Beyond-the-Rails is a trademark of Maxim Integrated Products.

Functional Diagram

M A X 4198/M A X 4199

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX4198 (+5V Supply)

(V CC = +5V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V SHDN = V CC - 1.5V, typical values are at T A = +25°C,

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (V CC to V EE )..................................................+8V All Other Pins to GND......................(V EE - 0.3V) to (V CC + 0.3V)Output Short Circuit Duration (to V CC or V EE )............Continuous Continuous Power Dissipation (T A = +70°C)

SO (derate 9.09mW/°C above +70°C)..........................471mW μMAX (derate 4.1mW/°C above +70°C).......................330mW

Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°C

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

ELECTRICAL CHARACTERISTICS—MAX4198 (+5V Supply) (continued)

(V CC = +5V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V SHDN = V CC - 1.5V, typical values are at T A = +25°C,T

= T to T , unless otherwise noted.) (Note 1)

ELECTRICAL CHARACTERISTICS—MAX4198 (+3V Supply)

(V CC = +3V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V SHDN = V CC - 1.5V, typical values are at T A = +25°C, T A = T MIN to T MAX,unless otherwise noted.) (Note 1)

M A X 4198/M A X 4199

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX4199 (+5V Supply)

(V CC = +5V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V SHDN = V CC - 1.5V, typical values are at T A = +25°C,T A = T MIN to T MAX , unless otherwise noted.) (Note 1)

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

_______________________________________________________________________________________

Note 1:The MAX4198EUA and the MAX4199EUA are 100% production tested at +25°C. All temperature limits are guaranteed

by design.

Note 2:Guaranteed by PSR test.

Note 3:When shutdown input is at logic high, the part is active; when at logic low, the part is in shutdown.

ELECTRICAL CHARACTERISTICS—MAX4199 (+5V Supply) (continued)

(V CC = +5V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V SHDN = V CC - 1.5V, typical values are at T A = +25°C,T A = T MIN to T MAX , unless otherwise noted.) (Note 1)

ELECTRICAL CHARACTERISTICS—MAX4199 (+3V Supply)

(V CC = +3V, V EE = 0V, R L = 25k ?tied to V CC / 2, V REF = V CC / 2, V S HDN = V CC - 1.5V, values are at T A = +25°C,T A = T MIN to T MAX , unless otherwise noted.) (Note 1)

M A X 4198/M A X 4199

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 6_______________________________________________________________________________________

Typical Operating Characteristics

(V CC = +5V, V EE = 0V, R L = 25k ?to V CC / 2, V SHDN = V CC - 1.5V, small-signal V OUT = 100mVp-p, large-signal V OUT = 1Vp-p, T A = +25°C, unless otherwise noted.)

3537363938414042

444345SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

S U P P L Y C U R R E N T (μA )

-40

10-15

356085100k 1M 0.1k 3210-1-2-3-4-5-6

10k FREQUENCY (Hz)

MAX4198

SMALL-SIGNAL GAIN vs. FREQUENCY

M A X 4198t o c 02

G A I N (d B )

100k 1M

0.1k 1k 10k MAX4199

SMALL-SIGNAL GAIN vs. FREQUENCY

M A X 4198t o c 03

FREQUENCY (Hz)

3210-1-2-3-4-5-6

N O R M A L I Z E D G A I N (d B )

-10-130

-110

100

10k

100k POWER-SUPPLY REJECTION vs.

FREQUENCY

-90FREQUENCY (Hz)P S R (d B )

-70-50-30

-120

-110-100

-90-80-70-60COMMON-MODE REJECTION vs.

TEMPERATURE

TEMPERATURE (°C)

C M R (d B )

-40

10-15

3560

0-120

-100

101001k 10k

100k

COMMON-MODE REJECTION vs.

FREQUENCY

-80FREQUENCY (Hz)

C M R (d B )

-60-40-20800-1000

0.1

100

OUTPUT VOLTAGE HIGH AND LOW vs.

LOAD RESISTANCE

-400-80040001000

-200-600

600200

LOAD (k ?)

V O L T A G E (m V )

-40

10-15

3560

-100

-50

100

INPUT OFFSET VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)

I N P U T O F F S E T V O L T A G E (

μV )

-40

10-15

3560

-0.014

-0.008-0.010-0.012

-0.0060-0.004-0.0020.0040.0020.008

0.006

GAIN ERROR vs. TEMPERATURE

TEMPERATURE (°C)

G A I N E R R O R (%)

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

_______________________________________________________________________________________7

10k 101

10k

100

100k

VOLTAGE NOISE DENSITY

vs. FREQUENCY

100

FREQUENCY (Hz)

V O L T A G E N O I S E D E N S I T Y (n V /H z )

1.000

0100

1k 10k

TOTAL HARMONIC DISTORTION VOLTAGE NOISE vs. FREQUENCY

0.010

0.001

0.100

FREQUENCY (Hz)

T H D + V O L T A G E N O I S E (%)

50μs/div

SMALL-SIGNAL PULSE RESPONSE

INPUT 50mV/div

OUTPUT 50mV/div

MAX4198toc12

50μs/div MAX4199

SMALL-SIGNAL PULSE RESPONSE

INPUT 5mV/div OUTPUT 50mV/div

MAX4198toc13

50μs/div MAX4198

LARGE-SIGNAL PULSE RESPONSE

INPUT 500mV/div OUTPUT 500mV/div MAX4198toc14

50μs/div

MAX4199

LARGE-SIGNAL PULSE RESPONSE

INPUT 50mV/div

OUTPUT 500mV/div

MAX4198toc15

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, R L = 25k ?to V CC / 2, V SHDN = V CC - 1.5V, small-signal V OUT = 100mVp-p, large-signal V OUT = 1Vp-p, T A = +25°C, unless otherwise noted.)

50μs/div MAX4198

SMALL-SIGNAL PULSE RESPONSE

WITH CAPACITIVE LOAD

INPUT 50mV/div

OUTPUT 50mV/div

C L = 690pF

50μs/div MAX4198

SMALL-SIGNAL PULSE RESPONSE WITH EXCESSIVE CAPACITIVE LOAD

INPUT 50mV/div

OUTPUT 50mV/div C L = 1060pF R ISO = 0?

50μs/div

MAX4198

SMALL-SIGNAL PULSE RESPONSE WITH

EXCESSIVE CAPACITIVE LOAD AND ISOLATION RESISTOR

INPUT 50mV/div

OUTPUT 50mV/div C L = 1060pF R ISO = 50?

M A X 4198/M A X 4199

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 8_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, R L = 25k ?to V CC / 2, V SHDN = V CC - 1.5V, small-signal V OUT = 100mVp-p, large-signal V OUT = 1Vp-p, T A = +25°C, unless otherwise noted.)

50μs/div MAX4199

SMALL-SIGNAL PULSE RESPONSE

WITH CAPACITIVE LOAD

INPUT 5mV/div

OUTPUT 50mV/div

C L = 590pF

50μs/div MAX4199

SMALL-SIGNAL PULSE RESPONSE WITH

EXCESSIVE CAPACITIVE LOAD

INPUT 5mV/div

OUTPUT 50mV/div

C L = 760pF R ISO = 0?

50μs/div

MAX4199

SMALL-SIGNAL PULSE RESPONSE WITH

EXCESSIVE CAPACITIVE LOAD AND ISOLATION RESISTOR

INPUT 5mV/div

OUTPUT 50mV/div

C L = 760pF R ISO = 75?

60402080120100-300-240-120-180-60

12060180240300

MAX4199 HISTOGRAM (V OS BASED ON 280 UNITS)

V OS (μV)

C O U N T

3040

2010

706050100

9080-0.08-0.06-0.04-0.020

0.020.040.06

0.08

MAX4198 HISTOGRAM

(GAIN ACCURACY BASED ON 200 UNITS)

GAIN ERROR (%)

C O U N T

40201008060160

140120-0.24-0.18-0.12-0.06

-0.060.120.180.24

MAX4199 HISTOGRAM

(GAIN ACCURACY BASED ON 280 UNITS)

GAIN ERROR (%)

C O U N T

10μs/div MAX4198

TIME EXITING SHUTDOWN

INPUT (SHDN PIN)500mV/div

OUTPUT 500mV/div

MAX4198toc22

10μs/div MAX4199

TIME EXITING SHUTDOWN

INPUT (SHDN PIN)500mV/div

OUTPUT 500mV/div

MAX4198toc23

302010406050-300-240-120-180-60012060180240300

MAX4198 HISTOGRAM (V OS BASED ON 200 UNITS)

V OS (μV)

C O U N T

_______________Detailed Description

The MAX4198/MAX4199 are precision low-power differ-ential amplifiers with factory-trimmed internal gain-set-ting resistors. The MAX4198 is trimmed to a gain of +1V/V and the MAX4199 is trimmed to a gain of +10V/V.

Input Stage

The Functional Diagram shows the internal structure of the MAX4198/MAX4199. Although the resistors are pre-cision matched, their absolute value varies by ±25%.The typical input impedance for the MAX4198 is 50k ?for the noninverting input and 25k ?for the inverting input. The typical input impedance for the MAX4199 is 275k ?for the noninverting input and 25k ?for the inverting input.

The common-mode inputs of the internal op amp can range from V EE to (V CC - 1.1V). Although the inputs to the internal op amp are not rail-to-rail, the internal resis-tors form a voltage divider that extends the input com-mon-mode range beyond-the-rails for the MAX4198.The overall input range of the MAX4198 extends 100mV beyond-the-rails without adversely affecting common-mode rejection or undergoing phase reversal (V CC =5V). The MAX4199 input common-mode range extends from 100mV below the negative rail to (V CC - 1V) (see the Input Common-Mode Voltage Range vs. Supply Voltage graph in the Typical Operating Characteristics ).

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

_______________________________________________________________________________________9

-0.5

1.50.54.53.5

2.57.56.55.52

MAX4199

INPUT COMMON-MODE RANGE vs.

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)I N P U T C O M M O N -M O D E V O L T A G E (V )

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, R L = 25k ?to V CC / 2, V SHDN = V CC - 1.5V, small-signal V OUT = 100mVp-p, large-signal V OUT = 1Vp-p, T A = +25°C, unless otherwise noted.)

-0.5

1.50.54.53.5

2.57.56.55.58.5

MAX4198

INPUT COMMON-MODE RANGE vs.

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

I N P U T C O M M O N -M O D E V O L T A G E (V )

M A X 4198/M A X 4199

Rail-to-Rail Output Stage

The MAX4198/MAX4199 output stage incorporates a common-source rail-to-rail structure which maximizes the dynamic range of the differential amplifier. The output can swing to within 100mV from each rail with a 5k ?load to V CC / 2 (see Typical Operating Characteristics ).

Shutdown Mode

The MAX4198/MAX4199 have an active-low shutdown input. SHDN input logic thresholds are referenced to V CC , not to GND. Pulling SHDN 2.5V below the positive rail places the amplifiers in a 12μA (max) shutdown mode. The MAX4198/MAX4199 exit or enter shutdown in 35μs. In shutdown, the OUT pin is high-impedance.

Applications Information

Driving Capacitive Loads

The MAX4198/MAX4199 are relatively immune to oscilla-tions caused when driving large capacitive loads.Although heavy load capacitance increases transient ring-ing, sustained oscillations typically don’t occur for loads under 600pF (see Pulse Response with Capacitive Load in the Typical Operating Characteristics ). Applications that require driving higher capacitive loads can isolate the out-put capacitance using a 15?to 100?resistor between the amplifier output and the load (Figure 1). Although adding an isolation resistor dampens the response enough to pre-vent oscillations, it does so at the expense of bandwidth and DC accuracy.

Power Supply Considerations

The MAX4198/MAX4199 operate from single +2.7V to +7.5V supplies or from dual ±1.35V to ±3.75V supplies,and they consume only 45μA of supply current.Excellent power-supply rejection permits the amplifiers to be operated directly from a decaying 3V cell without excessive error. To maximize AC performance, the sup-ply must be bypassed with a 0.1μF ceramic capacitor to ground that must be as close as possible to the pin.If dual supplies are used, bypass both supply pins with 0.1μF to ground.

Application Circuits

Differential amplifiers can be used in single-ended and other amplifier applications. Figures 2 through 6 show the MAX4198/MAX4199 in different configurations. The internally trimmed and matched resistors offer conven-ience and have a distinct advantage over external resistors. These amplifiers are not compensated for sin-gle-ended unity gain; therefore, IN- should not be con-nected to OUT or left unconnected.

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 10

______________________________________________________________________________________

Figure 1. Dual-Supply, Capacitive-Load Driving Circuit

Figure 2. Standard Difference Amplifier

Figure 3. Precision Inverting Buffer

Instrumentation Amplifier Applications

For applications that require a complete low-power instrumentation amplifier, refer to the MAX4194–MAX4197 data sheet. Some differential to single-ended voltage amplifier applications that don’t require a high input impedance can use the MAX4198/MAX4199 for gains of +1V/V or +10V/V. The MAX4198/MAX4199 can

also be used as an instrumentation amplifier building block. The circuit of Figure 7 takes advantage of the 10pA (max), 0.1pA (typ) bias current of the MAX406A to form an instrumentation amplifier similar to the MAX4194 family, except with lower input bias currents.The MAX406A's low 1.2μA supply current maintains a low overall supply current.

MAX4198/MAX4199

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

______________________________________________________________________________________

Figure 4. Precision Gain of Two Amplifiers Figure 5. Single-Supply Inverting Amplifier Biased at V CC / 2

Figure 6. Digitally Controlled Precision Gain of ±1 Amplifier

Figure 7. Ultra-Low Input Bias Current (0.1pA) Instrumentation

Amplifiers with 47μA Supply-Current Consumption

M A X 4198/M A X 4199

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 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.

12____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?1999 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Package Information

Chip Information

TRANSISTOR COUNT: 250

SUBSTRATE CONNECTED TO V

MAX4198-MAX4199中文资料

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