Maxim MAX4019ESD, MAX4019EEE, MAX4017EUA, MAX4017ESA, MAX4022ESD Datasheet

_______________General Description

The MAX4014/MAX4017/MAX4019/MAX4022 are preci­sion, closed-loop, gain of +2 (or -1) buffers featuring
high slew rates, high output current drive, and low dif­ferential gain and phase errors. These single-supply
devices operate from +3.15V to +11V, or from ±1.575V
to ±5.5V dual supplies. The input voltage range extends
100mV beyond the negative supply rail and the outputs
swing Rail-to-Rail®.

These devices require only 5.5mA of quiescent supply
current while achieving a 200MHz -3dB bandwidth and
a 600V/µs slew rate. In addition, the MAX4019 has a
disable feature that reduces the supply current to
400µA. Input voltage noise for these parts is only
10nV/√Hz and input current noise is only 1.3pA/√Hz.
This buffer family is ideal for low-power/low-voltage
applications that require wide bandwidth, such as
video, communications, and instrumentation systems.
For space-sensitive applications, the MAX4014 comes
in a tiny 5-pin SOT23 package.

________________________Applications

Portable/Battery-Powered Instruments
Video Line Driver
Analog-to-Digital Converter Interface
CCD Imaging Systems
Video Routing and Switching Systems

____________________________Features

♦ Internal Precision Resistors for Closed-Loop

Gains of +2 or -1

♦ High Speed:

200MHz -3dB Bandwidth
30MHz 0.1dB Gain Flatness (6MHz min)
600V/µs Slew Rate

♦ Single 3.3V/5.0V Operation
♦ Outputs Swing Rail-to-Rail
♦ Input Voltage Range Extends Beyond V

EE

♦ Low Differential Gain/Phase: 0.04%/0.02°
♦ Low Distortion at 5MHz:

-78dBc Spurious-Free Dynamic Range

-75dB Total Harmonic Distortion

♦ High Output Drive: ±120mA
♦ Low, 5.5mA Supply Current
♦ 400µA Shutdown Supply Current
♦ Space-Saving SOT23-5, µMAX, or QSOP Packages

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

________________________________________________________________

Maxim Integrated Products

1

__________Typical Operating Circuit

19-1284; Rev 0; 10/97

______________Ordering Information

PART

NO. OF

AMPS

ENABLE PIN-PACKAGE

MAX4014 1 No 5-Pin SOT23

MAX4017 2 No 8-Pin SO/µMAX

MAX4019 3 Yes

14-Pin SO,
16-Pin QSOP

MAX4022 4 No

14-Pin SO,
16-Pin QSOP

_____________________Selector Guide

PART

SOT

TOP MARK

MAX4014EUK

ABZQ

TEMP. RANGE

PIN-

PACKAGE

-40°C to +85°C 5 SOT23-5

MAX4017ESA

—-40°C to +85°C 8 SO
MAX4017EUA —-40°C to +85°C 8 µMAX
MAX4019ESD

—-40°C to +85°C 14 SO
MAX4019EEE —-40°C to +85°C 16 QSOP
MAX4022ESD

—
MAX4022EEE —

-40°C to +85°C 14 SO

-40°C to +85°C 16 QSOP

MAX4014

75Ω

500Ω

GAIN OF +2 VIDEO/RF CABLE DRIVER

500Ω

V

OUT

IN-

IN+

75Ω

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

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +5V, VEE= 0V, IN_- =0V, EN_ = 5V, RL= ∞ to ground, V

OUT

= VCC/ 2, noninverting configuration, TA= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

Supply Voltage (V

CC

to VEE)..................................................12V

IN_-, IN_+, OUT_, EN_ ....................(V

EE

- 0.3V) to (VCC+ 0.3V)

Output Short-Circuit Duration to V

CC

or VEE..............Continuous

Continuous Power Dissipation (T

A

= +70°C)

5-pin SOT23 (derate 7.1mW/°C above+70°C)..............571mW

8-pin SO (derate 5.9mW/°C above +70°C)...................471mW

8-pin µMAX (derate 4.1mW/°C above +70°C)..............330mW

14-pin SO (derate 8.3mW/°C above +70°C).................667mW

16-pin QSOP (derate 8.3mW/°C above +70°C)............667mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10sec).............................+300°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 at 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.

VEN_ Logic-High Threshold V

IH

MAX4019 VCC- 1.5

VEN_ Logic-Low Threshold V

IL

MAX4019 VCC- 2.6

kΩDisabled Output Resistance R

OUT(OFF)

MAX4019, EN_ = 0V, 0V ≤ V

OUT

≤ 5V 1

VOperating Supply-Voltage Range VCCto V

EE

3.15 11.0

dB

Power-Supply Rejection Ratio
(Note 3)

PSRR

VCC= 5V, VEE= 0V, V

OUT

= 2V 46 57

Output Current I

OUT

±80 ±120 mARL= 20Ω to VCCor V

EE

Output Resistance R

OUT

25

mΩ

f = DC

Short-Circuit Output Current I

SC

±150 mASinking or sourcing

VEE-0.1 VCC+0.1IN_-

VOL- V

EE

VCC- V

OH

VOL- V

EE

VCC- V

OH

VOL- V

EE

VCC- V

OH

0.06

0.06

RL= 2kΩ

0.04 0.50

0.75 1.50

RL=150Ω

0.04 0.50

Output Voltage Swing V

OUT

V

1.60 2.00

RL= 50Ω

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Resistance R

IN

3

MΩ

Input Bias Current I

B

5.4 20 µA

Input Offset Voltage Matching ±1 mV

Voltage Gain A

V

1.9 2 2.1 V/V

Input Offset Voltage

Input Voltage Range V

IN

VEE-0.1 VCC-2.25

V

V

OS

4 20 mV

Input Offset Voltage Drift TC

VOS

8 µV/°C

CONDITIONS

IN_+, over input voltage range

IN_+ (Note 2)

Any channels for
MAX4017/MAX4019/MAX4022

RL≥ 50Ω, (VEE+ 0.5V) ≤ V

OUT

≤ (VCC- 2.0V)

IN_+

RL= 50Ω

µAEN_ Logic Input Low Current I

IL

0.5

VCC= 5V, VEE= -5V, V

OUT

= 0V 54 66

VCC= 3.3V, VEE= 0V, V

OUT

= 0.9V 45

MAX4019

(VEE+ 0.2V) ≤ EN_ ≤ V

CC

200 550EN_ = V

EE

µAEN_ Logic Input High Current I

IH

0.5 10MAX4019, EN_ = V

CC

mA

Quiescent Supply Current
(per Buffer)

I

CC

5.5 8.0Enabled (EN_ = V

CC)

0.4 0.7MAX4019, disabled (EN_ = VEE)

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

_______________________________________________________________________________________ 3

Note 1: The MAX4014EUK is 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by

design.

Note 2: Tested with V

OUT

= +2.5V.

Note 3: PSRR for single +5V supply tested with V

EE

= 0V, VCC= +4.5V to +5.5V; for dual ±5V supply with VEE= -4.5V to -5.5V,

V

CC

= +4.5V to +5.5V; and for single +3V supply with VEE= 0V, VCC= +3.15V to +3.45V.

Note 4: Guaranteed by design.

AC ELECTRICAL CHARACTERISTICS

(VCC= +5V, VEE= 0V, IN_- = 0V, EN_ = 5V, RL= 100Ω to ground, noninverting configuration, TA= T

MIN

to T

MAX,

unless

otherwise noted. Typical values are at T

A

= +25°C.)

V

OUT

= 20mVp-p

MAX4017/MAX4019/MAX4022,
f = 10MHz, V

OU

T

= 2Vp-p

dB-95X

TALK

Buffer Crosstalk

MAX4017/MAX4019/MAX4022,
f = 10MHz, V

OUT

= 20mVp-p

dB0.1Buffer Gain Matching

MAX4019 µs1t

OFF

Buffer Disable Time

fC= 5MHz, V

OUT

= 2Vp-p dBc-78SFDR

Spurious-Free Dynamic
Range

MAX4019

f = 10MHz

MAX4019, EN_ = 0V

f = 10kHz

f = 10kHz

NTSC, RL= 150Ω

NTSC, RL= 150Ω

fC= 10MHz, A

VCL

= +2V/V

V

OUT

= 2Vp-p,

fC= 5MHz

V

OUT

= 100mVp-p

f = 10.0MHz

V

OUT

= 2V step

V

OUT

= 2V step

V

OUT

= 2Vp-p

V

OUT

= 20mVp-p (Note 4)

CONDITIONS

ns100t

ON

Buffer Enable Time

Ω

6Z

OUT

Output Impedance

pF2C

OUT(OFF)

Disabled Output Capacitance

pF1C

IN

Input Capacitance

pA/√Hz

1.3i

n

Input Noise Current Density

nV/√Hz

10e

n

Input Noise Voltage Density

%0.04DGDifferential Gain Error

degrees0.02DPDifferential Phase Error

dBm11Input 1dB Compression Point

dBm35IP3Third-Order Intercept

-75

-82

HDHarmonic Distortion

MHz200BW

SS

Small-Signal -3dB Bandwidth

-78

ns1tR, t

F

Rise/Fall Time

ns45t

S

Settling Time to 0.1%

V/µs600SRSlew Rate

MHz140BW

LS

Large-Signal -3dB Bandwidth

MHz6 30BW

0.1dB

Bandwidth for 0.1dB Gain
Flatness

UNITSMIN TYP MAXSYMBOLPARAMETER

dBc

Second harmonic

Total harmonic
distortion

Third harmonic

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

4 _______________________________________________________________________________________

8

1

100k 1M 10M 100M 1G

SMALL-SIGNAL GAIN vs. FREQUENCY

3

MAX4014-01

FREQUENCY (Hz)

GAIN (dB)

5

7

2

4

6

6.8

6.7

5.9
100k 1M 10M 100M 1G

GAIN FLATNESS vs. FREQUENCY

MAX4014-02

FREQUENCY (Hz)

GAIN (dB)

6.0

6.2

6.5

6.6

6.1

6.4

6.3

6

7

8

0

100k 1M 10M 100M 1G

LARGE-SIGNAL GAIN vs. FREQUENCY

3

MAX4014-03

FREQUENCY (Hz)

GAIN (dB)

5

2
1

4

50

-150
100k 1M 10M 100M 1G

MAX4017/19/22

CROSSTALK vs. FREQUENCY

-110

MAX4014-04

FREQUENCY (Hz)

CROSSTALK (dB)

-70

-30

10

30

-130

-90

-50

-10

0

-10

-20

-30

-60

-70

-90

-80

-40

-50

-100

MAX4014-07

LOAD (Ω)

0 200 400 600 800 1000

HARMONIC DISTORTION

vs. LOAD

HARMONIC DISTORTION (dBc)

f = 5MHz
V

OUT

= 2Vp-p

3rd HARMONIC

2rd HARMONIC

1000

0.1

0.1M 1M 10M 100M

CLOSED-LOOP OUTPUT IMPEDANCE

vs. FREQUENCY

MAX4014-05

FREQUENCY (Hz)

IMPEDANCE (Ω)

100

1

10

0

-100
100k 1M 10M 100M

HARMONIC DISTORTION

vs. FREQUENCY

-80

MAX4014-06

FREQUENCY (Hz)

HARMONIC DISTORTION (dBc)

-60

-40

-20

-10

-90

-70

-50

-30

V

OUT

= 2Vp-p

2ND HARMONIC

3RD HARMONIC

0

-10

-20

-30

-60

-70

-90

-80

-40

-50

-100

MAX4014-08

OUTPUT SWING (Vp-p)

0.5

1.0

1.5 2.0

HARMONIC DISTORTION

vs. OUTPUT SWING

HARMONIC DISTORTION (dBc)

f = 5MHz

3RD HARMONIC

2ND HARMONIC

10

-90
100k 10M 100M1M

MAX4019

OFF ISOLATION vs. FREQUENCY

-80

MAX4014-09

FREQUENCY (Hz)

OFF ISOLATION (dB)

-70

-60

-50

-40

-30

-20

-10

0

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= 0V, A

VCL

= +2, RL= 150Ω to VCC/ 2, TA = +25°C, unless otherwise noted.)

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

_______________________________________________________________________________________

5

20

-80
100k 1M 10M 100M

POWER-SUPPLY REJECTION

vs. FREQUENCY

-60

MAX4014-10

FREQUENCY (Hz)

POWER-SUPPLY REJECTION (dB)

-40

-20

0

10

-70

-50

-30

-10

7

6

4

5

3

MAX4014-16

TEMPERATURE (°C)

-25-50 0 755025 100

POWER-SUPPLY CURRENT (PER AMPLIFIER)

vs. TEMPERATURE

POWER-SUPPLY CURRENT (mA)

10

1

1 10 1k 10M1M

CURRENT NOISE DENSITY

vs. FREQUENCY

MAX4014-11

FREQUENCY (Hz)

NOISE (pA/ √Hz)

100 10k 100k

100

10

1

1 10 1k 10M1M

VOLTAGE NOISE DENSITY

vs. FREQUENCY

MAX4014-12

FREQUENCY (Hz)

NOISE (nV/√Hz)

100 10k 100k

5

2

10 100 1k 10k 100k 1M

OUTPUT SWING

vs. LOAD RESISTANCE

MAX4014-13

LOAD RESISTANCE (Ω)

OUTPUT SWING (Vp-p)

3

4

4.5

4.0

3.5

2.5

2.0

1.5

3.0

1.0

MAX4014-14

LOAD RESISTANCE (Ω)

25 50 75 100 125 150

OUTPUT SWING

vs. LOAD RESISTANCE (R

L

)

OUTPUT SWING (Vp-p)

400
350
300
250

150

50

100

200

0

MAX4014-15

LOAD RESISTANCE (Ω)

1000 200 500400300 600

BANDWIDTH

vs. LOAD RESISTANCE

BANDWIDTH (MHz)

6.0

5.5

4.5

5.0

4.0

MAX4014-17

TEMPERATURE (°C)

-25-50 0 755025 100

INPUT BIAS CURRENT

vs. TEMPERATURE

INPUT BIAS CURRENT (µA)

0.20

0.16

0.12

0.04

0.08

0

MAX4014-18

TEMPERATURE (°C)

-25-50 0 755025 100

INPUT OFFSET CURRENT

vs. TEMPERATURE

INPUT OFFSET CURRENT (µA)

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= 0V, A

VCL

= +2, RL= 150Ω to VCC/ 2, TA = +25°C, unless otherwise noted.)

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

6 _______________________________________________________________________________________

10

8

6

4

2

0

MAX4014-19

POWER-SUPPLY VOLTAGE (V)

43 5 6 7 8 9 10 11

POWER-SUPPLY CURRENT (PER AMPLIFIER)

vs. POWER-SUPPLY VOLTAGE

POWER-SUPPLY CURRENT (mA)

5.0

4.8

4.6

4.2

4.4

4.0

MAX4014-21

TEMPERATURE (°C)

-25-50 0 755025 100

VOLTAGE SWING vs. TEMPERATURE

VOLTAGE SWING (Vp-p)

RL = 150Ω TO V

CC

/ 2

5

4

3

1

2

0

MAX4014-20

TEMPERATURE (°C)

-25-50 0 755025 100

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

INPUT OFFSET VOLTAGE (mV)

-0.025

-0.020

-0.015

-0.010

-0.005

0.000

0.005

0.010

0 100

0 100

DIFFERENTIAL GAIN AND PHASE

-0.05

-0.04

-0.02

-0.03

-0.01

0.00

0.01

IRE

IRE

DIFF. PHASE (deg)

DIFF. GAIN (%)

MAX4014-22

IN

OUT

VOLTAGE (500mV/div)

LARGE-SIGNAL PULSE RESPONSE

MAX4014-25

TIME (20ns/div)

V

CM

= 0.9V, RL = 100Ω to GROUND

IN

OUT

VOLTAGE (25mV/div)

SMALL-SIGNAL PULSE RESPONSE

MAX4014-23

TIME (20ns/div)

VCM = 1.25V, RL = 100Ω to GROUND

IN

OUT

VOLTAGE (25mV/div)

SMALL-SIGNAL PULSE RESPONSE

(C

L

= 5pF)

MAX4014-24

TIME (20ns/div)

IN

OUT

VOLTAGE (500mV/div)

LARGE-SIGNAL PULSE RESPONSE

(C

L

= 5pF)

MAX4014-26

TIME (20ns/div)

V

CM

= 1.75V, RL = 100Ω to GROUND

EN_

5.0V
(ENABLE)

0V
(DISABLE)

1V

0V

OUT

ENABLE RESPONSE TIME

MAX4014-27

TIME (1µs/div)

VIN = 0.5V

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= 0V, A

VCL

= +2, RL= 150Ω to VCC/ 2, TA = +25°C, unless otherwise noted.)

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

_______________________________________________________________________________________ 7

______________________________________________________________Pin Description

53—
87—

96—
105—
14——

——4

485

71—

62—

——3

1142

SOT23-5

——1

———

SOSO/µMAX

3——

2——

———
———
———

1——

12——

13——

335
7710
6611
5512

10816

———

444
117
226

———

131113

QSOP

———

8, 9—8, 9

QSOPSO

——3
——2

1614—
1513—
1412—
——1

121014

11915

INA+

OUTB

INB-

INB+

OUTC

IN-

V

CC

OUTA

INA-

IN+

V

EE

OUT

N.C.

ENB

ENC

OUTD

IND-

IND+

ENA

INC+

INC-

Amplifier A Noninverting Input
Amplifier B Output
Amplifier B Inverting Input
Amplifier B Noninverting Input
Amplifier C Output

Inverting Input
Positive Power Supply
Amplifier A Output
Amplifier A Inverting Input

Noninverting Input

Negative Power Supply or Ground
(in single-supply operation)

Amplifier Output

No Connect. Not internally connected. Tie to
ground or leave open.

Enable Input for Amplifier B
Enable Input for Amplifier C

Amplifier D Output
Amplifier D Inverting Input
Amplifier D Noninverting Input
Enable Input for Amplifier A

Amplifier C Noninverting Input

Amplifier C Inverting Input

MAX4014 MAX4017 MAX4019 MAX4022

PIN

NAME FUNCTION

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

8 _______________________________________________________________________________________

_______________Detailed Description

The MAX4014/MAX4017/MAX4019/MAX4022 are sin­gle-supply, rail-to-rail output, voltage-feedback, closed­loop buffers that employ current-feedback techniques
to achieve 600V/µs slew rates and 200MHz band­widths. These buffers use internal 500Ω resistors to
provide a preset closed-loop gain of +2V/V in the non­inverting configuration or -1V/V in the inverting configu­ration. Excellent harmonic distortion and differential
gain/phase performance make these buffers an ideal
choice for a wide variety of video and RF signal-pro­cessing applications.

Local feedback around the buffer’ s output stage
ensures low output impedance, which reduces gain
sensitivity to load variations. This feedback also pro­duces demand-driven current bias to the output tran­sistors for ±120mA drive capability, while constraining
total supply current to less than 7mA.

__________Applications Information

Power Supplies

These devices operate from a single +3.15V to +11V
power supply or from dual supplies of ±1.575V to
±5.5V. For single-supply operation, bypass the VCCpin
to ground with a 0.1µF capacitor as close to the pin as
possible. If operating with dual supplies, bypass each
supply with a 0.1µF capacitor.

Selecting Gain Configuration

Each buffer in the MAX4014 family can be configured
for a voltage gain of +2V/V or -1V/V. For a gain of

+2V/V, ground the inverting terminal. Use the noninvert­ing terminal as the signal input of the buffer (Figure 1a).
Grounding the noninverting terminal and using the
inverting terminal as the signal input configures the
buffer for a gain of -1V/V (Figure 1b).

Since the inverting input exhibits a 500Ω input imped­ance, terminate the input with a 56Ω resistor when the
device is configured for an inverting gain in 50Ω appli­cations (terminate with 88Ω in 75Ω applications).
Terminate the input with a 49.9Ω resistor in the nonin­verting case. Output terminating resistors should direct­ly match cable impedances in either configuration.

Layout Techniques

Maxim recommends using microstrip and stripline tech­niques to obtain full bandwidth. To ensure that the PC
board does not degrade the buffer’s performance, design
it for a frequency greater than 1GHz. Pay careful attention
to inputs and outputs to avoid large parasitic capaci­tance. Whether or not you use a constant-impedance
board, observe the following guidelines when designing
the board:

• Don’t use wire-wrapped boards. They are too inductive.

• Don’t use IC sockets. They increase parasitic capac­itance and inductance.

• Use surface-mount instead of through-hole compon­ents for better high-frequency performance.

• Use a PC board with at least two layers; it should be
as free from voids as possible.

• Keep signal lines as short and as straight as possi­ble. Do not make 90° turns; round all corners.

MAX40_ _

500Ω

500Ω

IN-

OUT

*R

*R

OUT

IN

R

TIN

IN+

*RL = 2R

Figure 1a. Noninverting Gain Configuration (AV= +2V/V) Figure 1b. Inverting Gain Configuration (AV= -1V/V)

IN+

R

S

IN

R

TIN

*R

L

500Ω

IN-

= 2R

500Ω

MAX40_ _

OUT

*R

OUT

*R

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

_______________________________________________________________________________________ 9

Input Voltage Range and Output Swing

The input range for the MAX4014 family extends from
(VEE- 100mV) to (VCC- 2.25V). Input ground sensing
increases the dynamic range for single-supply applica­tions. The outputs drive a 2kΩ load to within 60mV of
the power-suply rails. With heavier loads, the output
swing is reduced as shown in the

Electrical Character-

istics

and the

Typical Operating Characteristics

. As the

load increases, the input range is effectively limited by

the output-drive capability, since the buffers have a
fixed voltage gain of +2 or -1.

For example, a 50Ω load can typically be driven from
40mV above V

EE

to 1.6V below VCC, or 40mV to 3.4V
when operating from a single +5V supply. If the buffer is
operated in the noninverting, gain of +2 configuration
with the inverting input grounded, the effective input
voltage range becomes 20mV to 1.7V, instead of the

-100mV to 2.75V indicated by the

Electrical Character-

istics

. Beyond the effective input range, the buffer out­put is a nonlinear function of the input, but it will not
undergo phase reversal or latchup.

Enable

The MAX4019 has an enable feature (EN_) that allows
the buffer to be placed in a low-power state. When the
buffers are disabled, the supply current will not exceed
550µA per buffer.

As the voltage at the EN_ pin approaches the negative
supply rail, the EN_ input current rises. Figure 2 shows
a graph of EN_ input current versus EN_ pin voltage.
Figure 3 shows the addition of an optional resistor in
series with the EN pin, to limit the magnitude of the cur­rent increase. Figure 4 displays the resulting EN pin
input current to voltage relationship.

20

-160
0 100 300 500

-100

-120

0

V

IL

(mV ABOVE VEE)

INPUT CURRENT (µA)

200 400

-60

-140

-20

-40

-80

Figure 2. Enable Logic-Low Input Current vs. Enable Logic­Low Threshold

OUT

IN-

EN_

IN+

10k

ENABLE

MAX40_ _

500Ω 500Ω

Figure 3. Circuit to Reduce Enable Logic-Low Input Current

0

-10
0 100 300 500

-7

-8

-1

V

IL

(mV ABOVE VEE)

INPUT CURRENT (µA)

200 400

-3

-5

-9

-2

-4

-6

Figure 4. Enable Logic-Low Input Current vs. Enable Logic­Low Threshold with 10k

Ω

Series Resistor

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

10 ______________________________________________________________________________________

Disabled Output Resistance

The MAX4014/MAX4017/MAX4019/MAX4022 include
internal protection circuitry that prevents damage to the
precision input stage from large differential input volt­ages, as shown in Figure 5. This protection circuitry con­sists of five back-to-back Schottky diodes between IN_+
and IN_-. These diodes lower the disabled output resis­tance from 1kΩ to 500Ω when the output voltage is 3V
greater or less than the voltage at IN_+. Under these

conditions, the input protection diodes will be forward
biased, lowering the disabled output resistance to 500Ω.

Output Capacitive Loading and Stability

The MAX4014/MAX4017/MAX4019/MAX4022 provide
maximum AC performance with no load capacitance.
This is the case when the load is a properly terminated
transmission line. However, they are designed to drive
up 25pF of load capacitance without oscillating, but
with reduced AC performance.

Driving large capacitive loads increases the chance of
oscillations occurring in most amplifier circuits. This is
especially true for circuits with high loop gains, such as
voltage followers. The buffer’s output resistance and
the load capacitor combine to add a pole and excess
phase to the loop response. If the frequency of this
pole is low enough to interfere with the loop response
and degrade phase margin sufficiently, oscillations can
occur.

A second problem when driving capacitive loads
results from the amplifier’s output impedance, which
looks inductive at high frequencies. This inductance
forms an L-C resonant circuit with the capacitive load,
which causes peaking in the frequency response and
degrades the amplifier’s gain margin.

Figure 6 shows the frequency response of the MAX4014/
MAX4017/MAX4019/MAX4022 under different capacitive
loads. To drive loads with greater than 25pF of capaci­tance or to settle out some of the peaking, the output
requires an isolation resistor like the one shown in

MAX4014
MAX4017
MAX4019
MAX4022

500Ω500Ω

OUT

IN-

IN+

Figure 5. Input Protection Circuit

6

-4
100k 10M 100M1M 1G

-2

FREQUENCY (Hz)

GIAN (dB)

0

2

4

5

-3

-1

1

3

CL = 10pF

CL = 15pF

CL = 5pF

Figure 6. Small-Signal Gain vs. Frequency with Load
Capacitance and No Isolation Resistor

500Ω

500Ω

R

ISO

C

L

V

OUT

V

IN

R

TIN

50Ω

MAX40_ _

Figure 7. Driving a Capacitive Load through an Isolation Resistor

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2

Buffers with Rail-to-Rail Outputs in SOT23

______________________________________________________________________________________ 11

30

25

20

5

10

15

0

CAPACITIVE LOAD (pF)

500 100 200150 250

ISOLATION RESISTANCE, R

ISO

(Ω)

Figure 8. Capacitive Load vs. Isolation Resistance

3

-7
100k 10M 100M1M 1G

-5

FREQUENCY (Hz)

GIAN (dB)

-3

-1

1

2

-6

-4

-2

0

CL = 68pF

R

ISO

= 27Ω

CL = 120pF

CL = 47pF

Figure 9. Small-Signal Gain vs. Frequency with Load
Capacitance and 27

Ω

Isolation Resistor

Figure 7. Figure 8 is a graph of the optimal isolation resis­tor versus load capacitance. Figure 9 shows the frequen­cy response of the MAX4014/MAX4017/MAX4019/
MAX4022 when driving capacitive loads with a 27Ω isola­tion resistor.

Coaxial cables and other transmission lines are easily dri­ven when properly terminated at both ends with their
characteristic impedance. Driving back-terminated trans­mission lines essentially eliminates the lines’ capacitance.

MAX4014/MAX4017/MAX4019/MAX4022

Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23

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

© 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

TOP VIEW

V

EE

IN-IN+

1 5 V

CC

OUT

MAX4014

SOT23-5

2

3 4

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUTC
INC­INC+
V

EE

V

CC

ENB

ENC

ENA

MAX4019

INB+
INB­OUTBOUTA

INA-

INA+

SO

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

ENA OUTC

INC­INC+
V

EE

INB+
INB­OUTB
N.C.

MAX4019

QSOP

ENC

ENB

INA-

V

CC

INA+

OUTA

N.C.

INB-

INB+V

EE

1
2

87V

CC

OUTBINA-

INA+

OUTA

SO/µMAX

3

4

6

5

MAX4017

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUTD
IND­IND+
V

EE

V

CC

INA+

INA-

OUTA

MAX4022

INC+
INC­OUTCOUTB

INB-

INB+

SO

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

OUTA OUTD

IND­IND+
V

EE

INC+
INC­OUTC
N.C.

MAX4022

QSOP

INA-

INA+

INB-

V

CC

INB+

OUTB

N.C.

__________________________________________________________Pin Configurations

___________________Chip Information

PART NUMBER

NO. OF

TRANSISTORS

MAX4014 95
MAX4017 190
MAX4019 299
MAX4022 362

SUBSTRATE CONNECTED TO V

EE