Datasheet MAX4187ESD, MAX4187EEE, MAX4185EUB, MAX4184ESA, MAX4183ESD Datasheet (Maxim)

General Description

The MAX4180 family of current-feedback amplifiers
combines high-speed performance, low distortion,
and excellent video specifications with ultra-low-power
operation in miniature packages. They operate from
±2.25V to ±5.5V dual supplies, or from a single +5V
supply. They require only 1mA of supply current per amp­lifier while delivering up to ±60mA of output current
drive. The MAX4180/MAX4182/MAX4183/MAX4186
are compensated for applications with a closed-loop
gain of +2 (6dB) or greater, and provide a -3dB band­width of 240MHz and a 0.1dB bandwidth of 70MHz.
The MAX4181/MAX4184/MAX4185/MAX4187 are com­pensated for applications with a +1 (0dB) or greater
gain, and provide a -3dB bandwidth of 270MHz and a

0.1dB bandwidth of 60MHz.
The MAX4180–MAX4187 feature 0.08%/0.03° differen-

tial gain and phase errors, a 20ns settling time to 0.1%,
and a 450V/µs slew rate, making them ideal for high­performance video applications. The MAX4180/
MAX4181/MAX4183/MAX4185 have a low-power shut­down mode that reduces power-supply current to 135µA
and places the outputs in a high-impedance state. This
feature makes them ideal for multiplexing applications.

The single MAX4180/MAX4181 are offered in space­saving 6-pin SOT23 packages.

________________________Applications

Portable/Battery-Powered High-Definition
Video/Multimedia Systems Surveillance Video

Broadcast and High-Definition Professional
TV Systems Cameras

High-Speed A/D Buffers Video Switching/

Multiplexing

CCD Imaging Systems
Medical Imaging

Features

♦ Ultra-Low Supply Current: 1mA per Amplifier
♦ Shutdown Mode:

Outputs Placed in High-Z
Supply Current Reduced to 135µA

♦ Operate from a Single +5V Supply or

Dual ±5V Supplies

♦ Wide Bandwidth:

270MHz -3dB Small-Signal Bandwidth
(MAX4181/84/85/87)

♦ 450V/µs Slew Rate
♦ Fast, 20ns Settling Time to 0.1%
♦ Excellent Video Specifications:

Gain Flatness to 70MHz (MAX4180/82/83/86)

0.08%/0.03° Differential Gain/Phase

♦ Low Distortion:

-73dBc SFDR (fC= 5MHz, V

OUT

= 2Vp-p)

♦ Available in Tiny Surface-Mount Packages:

6-Pin SOT23 (MAX4180/81)
10-Pin µMAX (MAX4183/85)
16-Pin QSOP (MAX4186/87)

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

________________________________________________________________

Maxim Integrated Products

1

19-1221; Rev 2; 8/98

5

V

EE

IN-

IN+

1

6

V

CC

SHDN

OUT

MAX4180
MAX4181

SOT23-6

SINGLE

TOP VIEW

2

3

4

Pin Configurations

Selector Guide

Pin Configurations continued at end of data sheet.

—

AAAB

SOT

TOP MARK

8 SO

6 SOT23-6

PIN-

PACKAGE

TEMP.

RANGE

-40°C to +85°C

-40°C to +85°CMAX4180ESA

MAX4180EUT-T

PART

Ordering Information continued at end of data sheet.

Ordering Information

AV≥ 1No4MAX4187

AV≥ 2No4MAX4186

AV≥ 1

AV≥ 1

AV≥ 2

AV≥ 2

AV≥ 1

AV≥ 2

OPTIMIZED

FOR

Yes

No

Yes

No

Yes

Yes

SHUTDOWN

MODE

2

2

2

2

1

1

No. OF

AMPS

MAX4184
MAX4185

PART

MAX4182
MAX4183

MAX4180
MAX4181

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

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

2 _______________________________________________________________________________________

SIN

TOP VIEW

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS—Dual Supplies

(VCC= +5V, VEE= -5V, VIN+ = 0V, SHDN ≥ 3V; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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 (VCCto VEE) .................................................12V

Analog Input Voltage.......................(V

EE

- 0.3V) to (VCC+ 0.3V)

Differential Input Voltage.......................................................±2V

SHDN Input Voltage........................(V

EE

- 0.3V) to (VCC+ 0.3V)
Short-Circuit Duration (OUT to GND, V

CC

or VEE).....Continuous

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 7.10mW/°C above +70°C)...........571mW

8-Pin SO (derate 5.88mW/°C above +70°C).................471mW

10-Pin µMAX (derate 5.60mW/°C above +70°C)..........444mW

14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW

16-Pin QSOP (derate 8.30mW/°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

SHDN Logic High Threshold

V

IH

V

CC

- 2.0 V(Notes 3, 4)

Open-Loop Transresistance

Input Bias Current
(Negative Input)

I

B-

±1 ±12 µA

µA

250 800

PARAMETER SYMBOL

MIN TYP MAX

UNITS

Input Bias Current
(Positive Input)

I

B+

Input Offset-Voltage Matching ±1

±1 ±7

kΩ

Input Resistance
(Positive Input)

R

IN+

Input Resistance
(Negative Input)

R

IN-

160 Ω

Input Offset Voltage

Input Voltage Range V

CM

±3.6 ±3.9 V

V

OS

±1.5 ±7 mV

Input Offset-Voltage Drift TC

VOS

±12 µV/°C

Common-Mode Rejection Ratio CMRR -50 -58 dB

T

R

0.8 3.0
MΩ

0.3 0.9

Output Voltage Swing V

SW

±3.75 ±4.0

V

±3.0 ±3.3

±3.0

Output Short-Circuit Current I

SC

±80 mA

Output Resistance R

OUT

0.2 Ω

Disabled Output Leakage
Current

I

OUT(OFF)

±0.1 ±6.0 µA

SHDN Logic Low Threshold

V

IL

VCC- 3.0 V

CONDITIONS

-3.6V ≤ VCM≤ 3.6V

MAX4182–MAX4187

RL= 1kΩ, V

OUT

= ±3.6V

RL= 150Ω, V

OUT

= ±2.5V

-3.6V ≤ V

IN+

≤ 3.6V, -1V ≤ (V

IN+

- V

IN-

) ≤ 1V

RL= 1kΩ
RL= 150Ω
RL= 100Ω

Guaranteed by CMRR test
VCM= 0V

SHDN ≤ VIL, V

OUT

≤ ±3V (Notes 2, 4)

(Notes 3, 4)

mV

Output Current I

OUT

±32 ±60 mARL= 30Ω

V

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(VCC= +5V, VEE= -5V, VIN+ = 0V, SHDN ≥ 3V; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

DC ELECTRICAL CHARACTERISTICS—Single Supply

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, RLto VCC/2; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

PARAMETER SYMBOL MIN TYP MAX UNITS

Positive Power-Supply
Rejection Ratio

PSRR+

SHDN Logic Input Bias Current

I

IN

±0.1 ±2.0 µA

Negative Power-Supply
Rejection Ratio

PSRR- 53 62

60 71

VCC= 5V, VEE= -4.5V to -5.5V dB

Operating Supply Voltage V

CC/VEE

±2.25 ±5.50 V

Quiescent Supply Current
per Amplifier

I

S

1.0 1.3
mA

I

S(OFF)

135 180 µA

CONDITIONS

RL= ∞

VEE= -5V, VCC= 4.5V to 5.5V

Shutdown Supply Current
per Amplifier

VEE≤ SHDN ≤ VCC(Note 4)

dB

SHDN = 0V, RL= ∞ (Note 4)

MAX418_EUT
All other packages 1.0 1.2

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Bias Current
(Positive Input)

I

B+

Input Offset Voltage Matching ±1 mV

Input Bias Current
(Negative Input)

I

B-

±1 ±12

±1 ±7

kΩ

Input Resistance
(Positive Input)

R

IN+

µA

Input Resistance
(Negative Input)

R

IN-

160 Ω

Input Offset Voltage

Input Voltage Range V

CM

1.3 to 1.1 to

3.7 3.9

V

V

OS

±1.5 ±7 mV

Input Offset Voltage Drift TC

VOS

±12 µV/°C

Common-Mode
Rejection Ratio

CMRR -50 -58 dB

T

R

0.8 2.5
MΩ

0.275 0.9

CONDITIONS

1.3V ≤ VCM≤ 3.7V

Open-Loop
Transresistance

MAX4182–MAX4187

µA

250 800

RL= 1kΩ, V

OUT

= 1.2V to 3.8V

RL= 150Ω, V

OUT

= 1.4V to 3.6V

1.3V ≤ V

IN+

≤ 3.7V, -1V ≤ (V

IN+

- V

IN-

) ≤ 1V

1.15 to 1.0 to

3.85 4.0

VCM= 2.5V

V

1.35 to 1.2 to

3.65 3.8

RL= 1kΩ

RL= 150Ω

Output Voltage Swing V

SW

1.3 to

3.7

RL= 100Ω

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

4 _______________________________________________________________________________________

DC ELECTRICAL CHARACTERISTICS—Single Supply (continued)

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, RLto VCC/2; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4180/4182/4183/4186)

(VCC= +5V, VEE= -5V, VIN= 0V, SHDN ≥ 3V, AV= +2V/V; see Table 1 for RFand RGvalues; TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL

MIN TYP MAX

UNITS

Power-Supply Rejection Ratio PSRR 60 71

Output Current I

OUT

±18 ±30 mA

Output Short-Circuit Current I

SC

±50 mA

Output Resistance R

OUT

0.2 Ω

dBV

CC

= 4.5V to 5.5V

Shutdown Supply Current
per Amplifier

I

S(OFF)

Disabled Output
Leakage Current

I

OUT(OFF

) ±0.1 ±4.0 µA

135 180 µA

SHDN = 0V, RL= ∞ (Note 4)

Quiescent Supply Current
per Amplifier

SHDN Logic-Low Threshold

V

IL

V

CC -

3.0

V

CONDITIONS

I

S

1.0 1.25
mARL = ∞

Operating Supply Voltage V

CC

4.5 5.5 V

SHDN Logic Input Bias Current

I

IN

±0.1 ±2.0 µA

0V ≤ SHDN ≤ VCC(Note 4)

RL = 30Ω

SHDN Logic-High Threshold

V

IH

V

CC -

2.0

V

SHDN ≤ VIL, 1.2V ≤ V

OUT

≤ 3.8V

(Notes 2, 4)

(Notes 3, 4)

(Notes 3, 4)

MAX418_EUT
All other packages 1.0 1.2

Third Harmonic Distortion

-73
dBc

-57RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

Second Harmonic Distortion

PARAMETER SYMBOL MIN TYP MAX UNITS

Settling Time to 0.1% t

S

20 ns

Slew Rate (Note 5) SR

340 450

V/µs

-83

dBc

-68

Bandwidth for 0.1dB Flatness
(Note 5)

BW

0.1dB

30 70

MHz

Rise/Fall Time tR, t

F

5 ns

Spurious-Free Dynamic Range SFDR

73

dBc

RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

57

190

Small-Signal -3dB Bandwidth
(Note 5)

BW

SS

180 245

MHz

RL = 150Ω

<0.5dB peaking

70

Large-Signal -3dB Bandwidth BW

LS

150 MHz

CONDITIONS

V

OUT

= 2V step, RL= 1kΩ

V

OUT

= 2V step, RL= 1kΩ

RL= 150Ω

RL= 1kΩ

V

OUT

= 2V step, RL= 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

RL=150Ω

RL=1kΩ

V

OUT

= 2Vp-p, RL= 1kΩ

Rising edge
Falling edge 315 420

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

________________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4181/4184/4185/4187)

(V

CC

= +5V, VEE= -5V, V

IN+

= 0V, SHDN ≥ 3V, AV= 1V/V; see Table 1 for RFvalues; TA= +25°C, unless otherwise noted.)

Differential Phase Error DP

0.01
degrees

0.48RL = 150Ω

NTSC

RL = 1kΩ

Third Harmonic Distortion

-57
dB

-66RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

Second Harmonic Distortion

-70
dB

-73RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

66RL = 150Ω

RL = 1kΩ

205

55RL= 150Ω

RL = 150Ω

<0.5dB peaking

RL = 1kΩ

PARAMETER SYMBOL MIN TYP MAX UNITS

Settling Time to 0.1% t

S

21 ns

Slew Rate (Note 5) SR

250 320

V/µs

Bandwidth for 0.1dB Flatness
(Note 5)

BW

0.1dB

20 60

MHz

Rise/Fall Time tRand t

F

5 ns

Spurious-Free Dynamic Range SFDR

57

dB

Small-Signal -3dB Bandwidth
(Note 5)

BW

SS

195 270

MHz

Large-Signal -3dB Bandwidth BW

LS

90 MHz

CONDITIONS

V

OUT

= 2V step, RL= 1kΩ

RL= 1kΩ

V

OUT

= 2V step, RL= 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2Vp-p, RL= 1kΩ

Rising edge

V

OUT

= 2V step, RL= 1kΩ

Falling edge 200 265

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4180/4182/4183/4186) (cont.)

(VCC= +5V, VEE= -5V, VIN= 0V, SHDN ≥ 3V, AV= +2V/V; see Table 1 for RFand RGvalues; TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Capacitance
(Positive Input)

C

IN+

1.5 pF

Output Impedance Z

OUT

4.8 Ω

Disabled Output Capacitance C

OUT(OFF)

4 pF

Turn-On Time from SHDN

t

ON

40 ns

Turn-Off Time to SHDN

t

OFF

400 ns

Power-Up Time 200 µs

Crosstalk -60 dB
Gain Matching to 0.1dB 25 MHz

CONDITIONS

f = 10kHzInput Noise Voltage Density e

n

f = 10kHz
SHDN ≤ VIL, V

OUT

≤ ±3V (Notes 2, 4)

(Note 4)
(Note 4)

nV/√Hz

f = 10MHz, MAX4182/4183/4186

2

f = 10MHz, MAX4182/4183/4186

Off Isolation -60 dB

SHDN ≤ 2V, RL= 150Ω, f = 10MHz

NTSCDifferential Phase Error DP

0.03
degrees

0.30RL = 150Ω

RL = 1kΩ

NTSCDifferential Gain Error DG

0.08

%

0.01RL = 150Ω

RL = 1kΩ

f = 10kHz

Input Noise Current Density i

n

4

pA/√Hz

5IN-

IN+

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

6 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4180/4182/4183/4186)

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, AV= +2V/V; see Table 1 for RFand RGvalues; TA= +25°C, unless otherwise noted.)

Differential Phase Error DP

0.01
degrees

0.35RL = 150Ω

NTSC

RL = 1kΩ

Third Harmonic Distortion

-72
dBc

-57RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

Second Harmonic Distortion

PARAMETER SYMBOL MIN TYP MAX UNITS

Settling Time to 0.1% t

S

20 ns

Slew Rate (Note 5) SR

260 340

V/µs

-80
dBc

-76

Bandwidth for 0.1dB Flatness
(Note 5)

BW

0.1dB

20 50

MHz

Rise/Fall Time tR and t

F

6 ns

Spurious-Free Dynamic Range SFDR

72

dB

RL = 150Ω

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

57

165

Small-Signal -3dB Bandwidth
(Note 5)

BW

SS

155 210

MHz

RL = 150Ω

<0.5dB peaking

40

Large-Signal -3dB Bandwidth BW

LS

110 MHz

CONDITIONS

V

OUT

= 2V step, RL= 1kΩ

V

OUT

= 2V step, RL= 1kΩ

RL= 150Ω

RL= 1kΩ

V

OUT

= 2V step, RL= 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

RL = 1kΩ

RL = 150Ω

RL = 1kΩ

V

OUT

= 2Vp-p, RL= 1kΩ

Rising edge
Falling edge 220 300

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4181/4184/4185/4187) (cont.)

(VCC= +5V, VEE= -5V, V

IN+

= 0V, SHDN ≥ 3V, AV= +1V/V; see Table 1 for RFvalues; TA= +25°C, unless otherwise noted.)

f = 10kHz

Input Noise Voltage Density e

n

2

nV/√Hz

NTSCDifferential Gain Error DG

0.09
%

0.16RL= 150Ω

RL= 1kΩ

f = 10kHz

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Noise Current Density i

n

4

pA/√Hz

5

Input Capacitance
(Positive Input)

C

IN+

1.5 pF

Output Impedance Z

OUT

4.8 Ω

Disabled Output Capacitance C

OUT(OFF)

4 pF

Turn-On Time from SHDN

t

ON

50 ns

Turn-Off Time to SHDN

t

OFF

400 ns

Power-Up Time 200 µs

Crosstalk -60 dB
Gain Matching to 0.1dB 25 MHz

CONDITIONS

IN-

IN+

f = 10kHz
SHDN ≤ VIL, V

OUT

≤ ±3V (Notes 2, 4)

(Note 4)
(Note 4)

f = 10MHz, MAX4184/4185/4187
f = 10MHz, MAX4184/4185/4187

Off Isolation -54 dB

SHDN ≤ 2V, RL= 150Ω, f = 10MHz

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

_______________________________________________________________________________________ 7

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4181/4184/4185/4187)

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, AV= +1V/V; see Table 1 for RFvalues; TA= +25°C, unless otherwise noted.)

V

OUT

= 2Vp-p, RL= 1kΩ

RL = 1kΩ
RL = 150Ω

RL = 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2V step, RL= 1kΩ

RL= 1kΩ
RL= 150Ω

V

OUT

= 2V step, RL= 1kΩ

CONDITIONS

MHz110BW

LS

Large-Signal -3dB Bandwidth

30

<0.5dB peaking

RL = 150Ω

MHz

175 220

BW

SS

Small-Signal -3dB Bandwidth
(Note 5)

170

59

RL = 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

RL = 150Ω

dB

55

SFDRSpurious-Free Dynamic Range

ns7tR and t

F

Rise/ Fall Time

MHz

16 40

BW

0.1dB

Bandwidth for 0.1dB Flatness
(Note 5)

-72

dBc

-61

V/µs

210 275

SRSlew Rate (Note 5)

ns22t

S

Settling Time to 0.1%

UNITSMIN TYP MAXSYMBOLPARAMETER

Second Harmonic Distortion

RL = 1kΩ

fC= 5MHz, V

OUT

= 2Vp-p

RL = 150Ω -59

dBc

-55

Third Harmonic Distortion

RL = 1kΩ

NTSC degrees

0.01

DPDifferential Phase Error

0.35RL = 150Ω

V

OUT

= 2V step, RL= 1kΩ

Rising edge
Falling edge 170 215

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4180/4182/4183/4186) (cont.)

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, AV= +2V/V; see Table 1 for RFand RGvalues; TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Capacitance
(Positive Input)

C

IN+

1.5 pF

Output Impedance Z

OUT

4.8 Ω

Disabled Output Capacitance C

OUT(OFF)

4 pF

Turn-On Time from SHDN

t

ON

40 ns

Turn-Off Time to SHDN

t

OFF

400 ns

Power-Up Time 200 µs

Crosstalk -60 dB
Gain Matching to 0.1dB 25 MHz

Input Noise Voltage Density e

n

2

nV/√Hz

NTSCDifferential Gain Error

CONDITIONS

DG

f = 10kHz

0.10
%

0.03RL= 150Ω

RL= 1kΩ

f = 10kHz

Input Noise Current Density i

n

f = 10kHz
SHDN ≤ VIL, 1.2V ≤ V

OUT

≤ 3.8V (Notes 2, 4)

(Note 4)

4

(Note 4)

pA/√Hz

f = 10MHz, MAX4182/4183/4186

5

f = 10MHz, MAX4182/4183/4186

IN-

IN+

Off Isolation -60 dB

SHDN ≤ 2V, RL= 150Ω, f = 10MHz

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

8 _______________________________________________________________________________________

SIN

TOP VIEW

Note 1: The MAX418_EUT is 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by

design.

Note 2: Does not include current into the external-feedback network.
Note 3: Over operating supply-voltage range.
Note 4: Specification applies to MAX4180/MAX4181/MAX4183 and MAX4185.
Note 5: The AC specifications shown are not measured in a production test environment. The minimum AC specifications given are

based on the combination of worst-case design simulations along with a sample characterization of units. These minimum
specifications are for design guidance only and are not intended to guarantee AC performance (see AC

Testing/

Performance

). For 100% testing of those parameters, contact the factory.

4
3
2
1

-6
1 10010 1000

MAX4180 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCA

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

RF = RG = 1.2kΩ
R

L

= 1kΩ

RF = RG = 680Ω
R

L

= 100Ω
OR
R

F

= RG = 820Ω
R

L

= 150Ω

VIN = 20mVp-p
A

V

= +2V/V

4
3
2
1

-6
1 10010 1000

MAX4180 SMALL-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCB

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

RF = RG = 1.2kΩ
R

L

= 1kΩ

RF = RG = 680Ω
R

L

= 100Ω
OR
R

F

= RG = 820Ω
R

L

= 150Ω

VCC = +5V
V

IN

= 20mVp-p

A

V

= +2V/V

4
3
2
1

-6
1 10010 1000

MAX4181 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCD

FREQUENCY (MHz)

GAIN (dB)

RF = 1kΩ
R

L

= 150Ω
OR
R

F

= 560Ω
R

L

= 100Ω

VIN = 20mVp-p
A

V

= +1V/V

RF = 2.4kΩ

R

L

= 1kΩ

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4181/4184/4185/4187) (cont.)

(VCC= +5V, VEE= 0V, VIN+ = 2.5V, SHDN ≥ 3V, AV= +1V/V; see Table 1 for RFvalues; TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Capacitance
(Positive Input)

C

IN+

1.5 pF

Output Impedance Z

OUT

4.8 Ω

Disabled Output Capacitance C

OUT(OFF)

4 pF

Turn-On Time from SHDN

t

ON

40 ns

Turn-Off Time to SHDN

t

OFF

400 ns

Power-Up Time 200 µs

Crosstalk -60 dB
Gain Matching to 0.1dB 25 MHz

Input Noise Voltage Density e

n

2

nV/√Hz

NTSCDifferential Gain Error

CONDITIONS

DG

f = 10kHz

0.10
%

0.03RL= 150Ω

RL= 1kΩ

f = 10kHz

Input Noise Current Density i

n

f = 10kHz
SHDN ≤ VIL, 1.2V ≤ V

OUT

≤ 3.8V (Notes 2, 4)

(Note 4)

4

(Note 4)

pA/√Hz

f = 10MHz, MAX4184/4185/4187

5

f = 10MHz, MAX4184/4185/4187

IN-

IN+

Off Isolation -54 dB

SHDN ≤ 2V, RL= 150Ω, f = 10MHz

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

_______________________________________________________________________________________

9

-6

-5

-4

-3

-2

-1

0

1

3
2

4

1 10 1000

MAX4187 SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX4180-87DD

FREQUENCY (MHz)

GAIN (dB)

100

VS = ±5V
V

IN

= 20mVp-p

A

V

= +1V/V

RF = 680Ω
R

L

= 100Ω

RF = 1.6kΩ
R

L

= 1kΩ

RF = 910Ω
R

L

= 150Ω

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

4
3
2
1

-6
1 10010 1000

MAX4181 SMALL-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCE

FREQUENCY (MHz)

GAIN (dB)

RF = 1kΩ
R

L

= 150Ω
OR
R

F

= 560Ω
R

L

= 100Ω

VCC = +5V
V

IN

= 20mVp-p

A

V

= +1V/V

RF = 2.4kΩ
R

L

= 1kΩ

-6

-5

-4

-3

-2

-1

0

1

3
2

4

1 10 1000

MAX4182/MAX4183 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

MAX4180-87AA

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

100

VS = ±5V
V

IN

= 20mVp-p

A

V

= +2V/V

RF = RG = 620Ω
R

L

= 100Ω

RF = RG = 680Ω
R

L

= 150Ω

RF = RG = 1kΩ

-6

-5

-4

-3

-2

-1

0

1

3
2

4

1 10 1000

MAX4184/MAX4185 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

MAX4180-87BB

FREQUENCY (MHz)

GAIN (dB)

100

VS = ±5V
V

IN

= 20mVp-p

A

V

= +1V/V

RF = 750Ω
R

L

= 150Ω

RF = 1.5kΩ
R

L

= 1kΩ

RF = 620Ω
R

L

= 100Ω

-6

-5

-4

-3

-2

-1

1
0

2

1 10 1000

MAX4186 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

MAX4180-87CC

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

100

VS = ±5V
V

IN

= 20mVp-p

A

V

= +2V/V

RF = RG = 680Ω
R

L

= 100Ω

RF = RG = 750Ω
R

L

= 150Ω

RF = RG = 1.1kΩ
R

L

= 1kΩ

4
3
2
1

-6
1 10010 1000

MAX4180 LARGE-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCJ

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

RF = RG = 1.2kΩ
R

L

= 1kΩ
OR
R

F

= RG = 820Ω
R

L

= 150Ω

AV = +2V/V
V

OUT

= 2Vp-p

0.4

0.3

0.2

0.1

-0.6
1 10010 1000

MAX4180 GAIN FLATNESS vs.

FREQUENCY (SINGLE & DUAL SUPPLIES)

-0.5

-0.4

-0.3

-0.1

-0.2

0

MAX1480-87 TOCF

FREQUENCY (MHz)

GAIN (dB)

VS = ±5V
R

F

= R

G

= 1.2kΩ

R

L

= 1kΩ

VS = ±5V

R

F

= RG = 820Ω

R

L

= 150Ω

VCC = +5V

R

F

= RG = 1.2kΩ

R

L

= 1kΩ

V

CC

= +5V

R

F

= RG = 820kΩ

R

L

= 150Ω

VIN = 20mVp-p
A

V

= +2V/V

0.4

0.3

0.2

0.1

-0.6
1 10010 1000

MAX4181 GAIN FLATNESS vs.

FREQUENCY (SINGLE & DUAL SUPPLIES)

-0.5

-0.4

-0.3

-0.1

-0.2

0

MAX1480-87 TOCH

FREQUENCY (MHz)

GAIN (dB)

VS = ±5V
R

F

= 2.4kΩ

R

L

= 1kΩ

VCC = +5V
R

F

= 1kΩ

R

L

= 150Ω

VCC = +5V
R

F

= 2.4kΩ

R

L

= 1kΩ

VS = ±5V
R

F

= 1kΩ

R

L

= 150Ω

VIN = 20mVp-p
A

V

= +1V/V

4
3
2
1

-6
1 10010 1000

MAX4180 LARGE-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCK

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

V

OUT

= 1Vp-p

R

F

= RG = 680Ω

R

L

= 100Ω

RF = RG = 820Ω

R

L

= 150Ω

V

OUT

= 2Vp-p

OR

R

F

= RG = 1.2kΩ

R

L

= 1kΩ

V

OUT

= 2Vp-p

VCC = +5V
A

V

= +2V/V

-120

-110

-100

-90

-80

-70

-60

-50

-30

-40

-20

110

MAX4182 CROSSTALK

vs. FREQUENCY

MAX4180-87EE

FREQUENCY (MHz)

CROSSTALK (dB)

100 300

V

OUTB

= 2Vp-p

V

OUTA

MEASURED

A

V

= +2V/V

RF = RG = 1kΩ
R

L

= 1kΩ

RF = RG = 680Ω
R

L

= 150Ω

-100

-90

-80

-70

-60

-50

-40

-30

-10

-20

0

110

MAX4187 CROSSTALK

vs. FREQUENCY

MAX4180-87HH

FREQUENCY (MHz)

CROSSTALK (dB)

100 300

V

OUTA

= 2Vp-p

V

OUTD

MEASURED

A

V

= +1V/V

RF = 910Ω
R

L

= 150Ω

RF = 1.6kΩ
R

L

= 1kΩ

-120

-110

-100

-90

-80

-70

-60

-50

-30

-40

-20

110

MAX4184 CROSSTALK

vs. FREQUENCY

MAX4180-87FF

FREQUENCY (MHz)

CROSSTALK (dB)

100 300

V

OUTB

= 2Vp-p

V

OUTA

MEASURED

A

V

= +1V/V

RF = 750Ω
R

L

= 150Ω

RF = 1.5kΩ
R

L

= 1kΩ

-100

-90

-80

-70

-60

-50

-40

-30

-10

-20

0

110

MAX4186 CROSSTALK

vs. FREQUENCY

MAX4180-87GG

FREQUENCY (MHz)

CROSSTALK (dB)

100 300

V

OUTD

= 2Vp-p

V

OUTA

MEASURED

A

V

= +2V/V

RF = RG = 1.1kΩ
R

L

= 1kΩ

RF = RG = 750Ω
R

L

= 150Ω

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

10 ______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

4
3
2
1

-6
1 10010 1000

MAX4181 LARGE-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-5

-4

-3

-1

-2

0

MAX1480-87 TOCM

FREQUENCY (MHz)

GAIN (dB)

AV = +1V/V

V

OUT

= 2Vp-p

R

F

= 2.4kΩ

R

L

= 1kΩ
OR
V

OUT

= 2Vp-p

R

F

= 1kΩ
R

L

= 150Ω

V

OUT

= 1Vp-p

R

F

= 560Ω

R

L

= 100Ω

4
3
2
1

-6
1 10010 1000

MAX4181 LARGE-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-5

-4

-3

-1

-2

0

MA480-87 TOCN

FREQUENCY (MHz)

GAIN (dB)

VCC = +5V
A

V

= +1V/V

V

OUT

= 1Vp-p

R

F

= 560Ω

R

L

= 100Ω

V

OUT

= 2Vp-p

R

F

= 1kΩ

R

L

= 150Ω
OR
V

OUT

= 2Vp-p

R

F

= 2.4kΩ

R

L

= 1kΩ

0

-10

-20

-30

-90

0.10.01 101 100

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

-80

-70

-50

-60

-40

MAX1480-87 TOCP

FREQUENCY (MHz)

PSRR (dB)

V

CC

(MAX4181)

V

CC

(MAX4180)

V

EE

(MAX4181)

V

EE

(MAX4181)

100

10

0.1

0.1 101 1000100

OUTPUT IMPEDANCE vs. FREQUENCY

1

MAX1480-87 TOCQ

FREQUENCY (MHz)

OUTPUT IMPEDANCE (Ω)

4
3
2
1

-6
1 10010 1000

MAX4180 SMALL-SIGNAL GAIN

vs. FREQUENCY

-5

-4

-3

-1

-2

0

MAX1480-87 TOCL

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

VS = ±5V
V

IN

= 20mVp-p

R

L

= 1kΩ

AV = +5V/V

R

F

= 910Ω

R

G

= 220Ω

AV = +10V/V

R

F

= 750Ω

R

G

= 82Ω

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________

11

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

-30

-100

0.1 1 100

MAX4180 HARMONIC DISTORTION

vs. FREQUENCY (DUAL SUPPLIES)

-80

-90

-60

-70

-40

-50

MAX4180 TOC16

FREQUENCY (MHz)

DISTORTION (dBc)

10

3RD (RL = 1kΩ)

2ND (RL = 1kΩ)

2ND (RL = 150Ω)

3RD (RL = 150Ω)

3.4

3.2

2.8

2.4

2.0

1.6

1.4
100 1M1k 10k 100k 10M 100M 1G

VOLTAGE-NOISE DENSITY

vs. FREQUENCY (INPUT REFERRED)

1.8

MAX4180 TOC14

FREQUENCY (Hz)

2.2

2.6

3.0

VOLTAGE-NOISE DENSITY (nV/√Hz)

45

35

25

15

5
0

100 1M1k 10k 100k 10M 100M 1G

TOTAL VOLTAGE-NOISE DENSITY

vs. FREQUENCY (INPUT REFERRED)

10

MAX4180 TOC15

FREQUENCY (Hz)

20

30

40

1.2kΩ

1.2kΩ

V

IN

V

OUT

VOLTAGE-NOISE DENSITY (nV/√Hz)

-30

0.1 1 100

MAX4181 HARMONIC DISTORTION

vs. FREQUENCY (DUAL SUPPLIES)

-80

-100

-90

-60

-70

-40

-50

MAX4180 TOC18

FREQUENCY (MHz)

DISTORTION (dBc)

10

2ND (RL = 150Ω)

2ND (RL = 1kΩ)

3RD (RL = 150Ω)

3RD (RL = 1kΩ)

-30

0.1 1 100

MAX4180 HARMONIC DISTORTION

vs. FREQUENCY (SINGLE SUPPLY)

-80

-90

-60

-70

-40

-50

MAX4180 TOC17

FREQUENCY (MHz)

DISTORTION (dBc)

10

2ND (RL = 150Ω)

2ND (RL = 1kΩ)

3RD (RL = 150Ω)

3RD (RL = 1kΩ)

-30

0.1 1 100

MAX4181 HARMONIC DISTORTION

vs. FREQUENCY (SINGLE SUPPLY)

-80

-90

-60

-70

-40

-50

MAX4180 TOC19

FREQUENCY (MHz)

DISTORTION (dBc)

10

2ND (RL = 1kΩ)

3RD (RL = 150Ω)

3RD (RL = 1kΩ)

2ND (RL = 150Ω)

0.75

1.00

1.25

95

125

155

140

110

-60 -20 0-40 20 40 60 80 100

SUPPLY CURRENT

(OPERATING & SHUTDOWN)

vs. TEMPERATURE

MA4180 TOC21

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

SHUTDOWN SUPPLY CURRENT (µA)

SHUTDOWN SUPPLY CURRENT

SUPPLY CURRENT

20

25

35

30

40

45

10 20 2515 30 35 40 45 50

TWO-TONE THIRD-ORDER INTERCEPT

vs. FREQUENCY

MAX4180 TOC20

FREQUENCY (MHz)

THIRD-ORDER INTERCEPT (dBm)

MAX4181

MAX4180

f2 = f1 + 0.1MHz

-5

-3

5

3

1

-1

-60 -20 0-40 20 40 60 80 100

OUTPUT VOLTAGE SWING

vs. TEMPERATURE

MA4180 TOC22

TEMPERATURE (°C)

OUTPUT SWING (V)

RL = 150Ω

RL = 150Ω

RL = 1kΩ

RL = 1kΩ

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

12 ______________________________________________________________________________________

3V

R

L

= 150Ω, RF = RG = 820Ω

GND

GND

2V

SHUTDOWN RESPONSE TIME

MAX4180/87-TOC28

100ns/div

OUT

SHDN

AV = +2V/V
V

IN+

= 1V

DC

RL = 1kΩ, RF = RG = 1.2kΩ

+0.5V

IN

-0.5V

+1V
OUT

-1V

MAX4180

LARGE-SIGNAL PULSE RESPONSE

MAX4180/87-TOC29

10ns/div

RL = 150Ω, RF = RG = 820Ω

+0.5V

+1V

MAX4180

LARGE-SIGNAL PULSE RESPONSE

MAX4180/87-TOC30

10ns/div

IN

OUT

-1V

-0.5V

RL = 100Ω, RF = RG = 680Ω

+0.5V

+1V

MAX4180

LARGE-SIGNAL PULSE RESPONSE

MAX4180/87-TOC31

10ns/div

IN

-0.5V

OUT

-1V

RL = 1kΩ, RF = RG = 1.2kΩ

+25mV

+50mV

MAX4180

SMALL-SIGNAL PULSE RESPONSE

MAX4180/87-TOC32

10ns/div

IN

OUT

-50mV

-25mV

0

0.2

1.0

0.8

0.6

0.4

-60 -20 0-40 20 40 60 80 100

INPUT BIAS CURRENT

vs. TEMPERATURE

MA4180 TOC23

TEMPERATURE (°C)

INPUT BIAS CURRENT (µA)

I

B-

I

B+

0

1

4

3

2

-60 -20 0-40 20 40 60 80 100

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

MA4180 TOC24

TEMPERATURE (°C)

INPUT OFFSET VOLTAGE (mV)

+50mV

R

F

= 1kΩ, RL = 150Ω

OUT

MAX4181

SMALL-SIGNAL PULSE RESPONSE

MAX4180/87-TOC26

10ns/div

+50mV

-50mV

IN

-50mV

+10

R

F

= 1kΩ,V

IN

= VCC/2, RL = ∞

GND

GND

V

OUT

V

CC

+5V

POWER-ON TRANSIENT

MAX4180/87-TOC27

100µs/div

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 13

RL = 150Ω, RF = RG = 820Ω

+25 mV

+50mV

MAX4180

SMALL-SIGNAL PULSE RESPONSE

MAX4180/87-TOC33

10ns/div

IN

OUT

-50mV

-25mV

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)

RL = 100Ω, RF = RG = 680Ω

+25mV

+50mV

MAX4180

SMALL-SIGNAL PULSE RESPONSE

MAX4180/87-TOC34

10ns/div

OUT

-50mV

IN

-25mV

RL = 1kΩ, RF = 2.4kΩ

+50mV

+50mV

MAX4181

SMALL-SIGNAL PULSE RESPONSE

MAX4180/87-TOC36

10ns/div

IN

OUT

-50mV

-50mV

VS = ±5V, RL = 1kΩ, RF = 2.4kΩ

+1V

+1V

MAX4181

LARGE-SIGNAL PULSE RESPONSE

MAX4180/87-TOC35

10ns/div

IN

-1V

OUT

-1V

______________________________________________________________Pin Description

MAX4180/MAX4181

MAX4180/MAX4181

4
3

SOT23-6

5

6

Inverting InputIN-2
Noninverting InputIN+3

1

2

Negative Power Supply. Connect VEEto -5V or ground for
single-supply operation.

V

EE

4

FUNCTIONNAME

Shutdown Input. Device is enabled when SHDN ≥ (VCC- 2V)
and disabled when SHDN ≤ (V

CC

- 3V).

SHDN

8

Positive Power Supply. Connect V

CC

to +5V.V

CC

7

Amplifier OutputOUT6

PIN

—

No Connect. Not internally connected.N.C.1, 5

SO

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

14 ______________________________________________________________________________________

MAX4186/MAX4187

_________________________________________________Pin Description (continued)

MAX4182/MAX4183/MAX4184/MAX4185

SO SO

1

µMAX

1

MAX4183
MAX4185

PIN

MAX4183
MAX4185

—

4

5, 7, 8, 10

4

Amplifier A OutputOUTA1

3

2 Amplifier A Inverting InputINA-2

3

2

FUNCTIONNAME

MAX4182
MAX4184

No Connect. Not internally connected.N.C.—

Negative Power Supply. Connect VEEto -5V or ground for
single-supply operation.

V

EE

4

Amplifier A Noninverting InputINA+3

— 6 5

SHDNA

Shutdown Control Input for Amplifier A. Amplifier A is
enabled when SHDNA ≥ (V

CC

- 2V) and disabled when

SHDNA ≤ (V

CC

- 3V).

— 9 6

SHDNB

Shutdown Control Input for Amplifier B. Amplifier B is
enabled when SHDNB ≥ (V

CC

- 2V) and disabled when

SHDNB ≤ (V

CC

- 3V).

5 11 7 INB+ Amplifier B Noninverting Input
6 12 8 INB- Amplifier B Inverting Input
7 13 9 OUTB Amplifier B Output
8 14 10 V

CC

Positive Power Supply. Connect V

CC

to +5V.

1
2

MAX4186
MAX4187

PIN

6

5

Amplifier A OutputOUTA1
Amplifier A Inverting InputINA-2

4

3 Amplifier A Noninverting InputINA+3

FUNCTIONNAME

MAX4186
MAX4187

Amplifier B Inverting InputINB-6

Amplifier B Noninverting InputINB+5

Positive Power Supply. Connect VCCto +5V.V

CC

4

7 7 OUTB Amplifier B Output

—

8, 9 N.C. No Connect. Not internally connected.
8 10 OUTC Amplifier C Output
9 11 INC- Amplifier C Inverting Input

10 12 INC+ Amplifier C Noninverting Input
11 13 V

EE

Negative Power Supply. Connect V

EE

to -5V or ground for

single-supply operation.

12 14 IND+ Amplifier D Noninverting Input
13 15 IND- Amplifier D Inverting Input
14 16 OUTD Amplifier D Output

QSOPSO

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 15

Detailed Description

The MAX4180–MAX4187 are ultra-low-power current­feedback amplifiers featuring bandwidths up to
270MHz, 0.1dB gain flatness to 90MHz, and low differ­ential gain (0.08%) and phase (0.03°) errors. These
amplifiers achieve ultra-high bandwidth-to-power ratios
with low distortion, wide signal swing, and excellent
load-driving capabilities. They are optimized for ±5V
supplies but also operate from a single +5V supply
while consuming only 1mA per amplifier. With ±60mA
output current drive capability, the devices achieve low
distortion even while driving 150Ω loads.

Wide bandwidth, low power, low differential phase and
gain error, and excellent gain flatness make the
MAX4180–MAX4187 ideal for use in portable video
equipment such as cameras, video switchers, and
other battery-powered applications. Their two-stage
design provides higher gain and lower distortion than
conventional single-stage, current-feedback topolo­gies. This feature, combined with fast settling time,
makes these devices suitable for buffering high-speed
analog-to-digital converters (ADCs).

The MAX4180/MAX4181/MAX4183/MAX4185 have a
low-power shutdown mode that is activated by driving
the amplifiers’ SHDN input low. Placing them in shut­down reduces quiescent supply current to 135µA (typ)
and places amplifier outputs in a high-impedance
state. These amplifiers can be used to implement a
high-speed multiplexer by connecting together the out­puts of multiple amplifiers and controlling the SHDN
inputs to enable one amplifier and disable all the oth­ers. The disabled amplifiers present very little load
(0.1µA leakage current and 4pF capacitance) to the
active amplifiers’ output. Note that the feedback net­work impedance of all the disabled amplifiers must be
considered when calculating the total load on the
active amplifier output.

Application Information

Theory of Operation

The MAX4180–MAX4187 are current-feedback ampli­fiers, and their open-loop transfer function is expressed
as a transimpedance, ∆V

OUT

/∆IIN, or TZ. The frequency
behavior of the open-loop transimpedance is similar to
the open-loop gain of a voltage-mode feedback
amplifier. That is, it has a large DC value and decreas­es at approximately 6dB per octave.

Analyzing the follower with gain, as shown in Figure 1,
yields the following transfer function:

V

OUT

/ VIN= G x [(TZ(S) / TZ(s) + G x (RIN+ RF)]

where G = A

VCL

= 1 + (RF/ RG), and RIN= 1 /gM≅ 160Ω.

At low gains, G x RIN< RF. Therefore, the closed-loop
bandwidth is essentially independent of closed-loop
gain. Similarly TZ> RFat low frequencies, so that:

Layout and Power-Supply Bypassing

The MAX4180–MAX4187 have an RF bandwidth and,
consequently, require careful board layout, including
the possible use of constant-impedance microstrip or
stripline techniques.

To realize the full AC performance of these high-speed
amplifiers, pay careful attention to power-supply bypass­ing and board layout. The PC board should have at least
two layers: a signal and power layer on one side, and a
large, low-impedance ground plane on the other side.
The ground plane should be as free of voids as possible.
With multilayer boards, locate the ground plane on a
layer that incorporates no signal or power traces.

Regardless of whether a constant-impedance board is
used, observe the following guidelines when designing
the board:

• Do not use wire-wrap boards. They are too
inductive.

• Do not use breadboards. They are too capacitive.

• Do not use IC sockets. They increase parasitic
capacitance and inductance.

• Use surface-mount components rather than through­hole components. They give better high-frequency
performance, have shorter leads, and have lower
parasitic reactances.

• Keep lines as short and as straight as possible.

V

V

OUT

IN

( / )==+GRR

FG

1

V

IN

R

F

R

G

V

OUT

T

2

R

IN

+1

+1

MAX4180-MAX4187

Figure 1. Current-Feedback Amplifier

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

16 ______________________________________________________________________________________

• Do not make 90° turns; round all corners.

• Observe high-frequency bypassing techniques to
maintain the amplifiers’ accuracy. The bypass cap­acitors should include a 0.01µF to 0.1µF ceramic
capacitor between each supply pin and the ground
plane, located as close to the package as possible.

• Place a 1µF ceramic capacitor in parallel with each

0.01µF to 0.1µF capacitor, as close to them as
possible.

• Place a 10µF to 15µF low-ESR tantalum at the point
of entry to the power-supply pins’ PC board. The
power-supply trace should lead directly from the
tantalum capacitor to the VCCand VEEpins.

• Keep PC traces short and use surface-mount com­ponents to minimize parasitic inductance.

Maxim’s High-Speed Evaluation Board

Figures 2 and 3 show layouts of Maxim’s high-speed
single SOT23 and SO evaluation boards. These boards
were developed using the techniques described
above. The smallest available surface-mount resistors
were used for feedback and back-termination
to minimize their distance from the part, reducing the
capacitance associated with longer lead lengths.

SMA connectors were used for best high-frequency
performance. Because distances are extremely short,
performance is unaffected by the fact that inputs and
outputs do not match a 50Ω line. However, in applica­tions that require lead lengths greater than one-quarter
of the wavelength of the highest frequency of interest,
use constant-impedance traces.

Fully assembled evaluation boards are available for the
MAX4180ESA.

Figure 2a. SOT23 High-Speed EV Board
Component Placement Guide—
Component Side

Figure 2b. SOT23 High-Speed EV Board
Layout—Component Side

Figure 2c. High-Speed EV Board
Layout—Solder Side

Figure 3a. SO-8 High-Speed EV Board
Component Placement Guide—
Component Side

Figure 3b. SO-8 High-Speed EV Board
Layout—Component Side

Figure 3c. SO-8 High-Speed EV Board
Layout—Solder Side

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 17

Table 1. Recommended Component Values

Choosing Feedback and Gain Resistors

The optimum value of the external-feedback (RF) and
gain-setting (RG) resistors used with the MAX4180–
MAX4187 depends on the closed-loop gain and the
application circuit’s load. Table 1 lists the optimum
resistor values for some specific gain configurations.
One-percent resistor values are preferred to maintain
consistency over a wide range of production lots.
Figures 4a and 4b show the standard inverting and
noninverting configurations. Note that the noninverting
circuit gain (Figure 4) is 1 plus the magnitude of the
inverting closed-loop gain. Otherwise, the two circuits
are identical.

DC and Noise Errors

Several major error sources must be considered in any
op amp. These apply equally to the MAX4180–
MAX4187. Offset-error terms are given by the equation
below. Voltage and current-noise errors are root-square
summed and are therefore computed separately. In
Figure 5, the total output offset voltage is determined by
the following factors:

• The input offset voltage (V

OS

) times the closed-loop

gain (1 = RF / RG).

• The positive input bias current (I

B+

) times the source
resistor (RS) (usually 50Ω or 75Ω), plus the negative
input bias current (IB-) times the parallel combination
of RGand RF. In current-feedback amplifiers, the
input bias currents at the IN+ and IN- terminals do
not track each other and may have opposite polarity,
so there is no benefit to matching the resistance at
both inputs.

The equation for the total DC error at the output is:

The total output-referred noise voltage is:

e

R

R

iR iR R e

n OUT

F

G

nS nF G n()

|| =+











()

[]

+

()

[]

+

()

+−

1

22

2

V

OUT

|| =

()+()

()

+

[]

+











+−

IR I R R V

R

R

BS B F G OS

F

G

1

245

1.2k

1.2k

RL= 1kΩ

190

680

680

RL=

100Ω

-3dB BW (MHz) 190

820

820

RL= 150Ω

RG(Ω)

RF(Ω)

COMPONENT/BW

105

180

750

RL=

1kΩ/150Ω

AV= +10V/V

205

—

1k

RL=

150Ω

120 270

—

2.4k

RL= 1kΩ

220

910

RL=

1kΩ/150Ω

AV= +5V/V

200

—

560

RL=

100Ω

AV= +2V/V AV= +1V/V

MAX4180 MAX4181

AV= +2V/V

245

1k

1k

RL=

1kΩ

160

MAX4182/MAX4183

620

620

RL=

100Ω

-3dB BW
(MHz)

190

680

680

RL=

150Ω

RG(Ω)

RF(Ω)

COMPONENT/

BW

AV= +2V/V

245

1.1k

1.1k

RL=

1kΩ

175

MAX4186

680

680

RL=

100Ω

190

750

750

RL=

150Ω

AV= +1V/V

270

—

1.6k

RL=
1kΩ

200

MAX4187

—

680

RL=

100Ω

205

—

910

RL=

150Ω

AV= +1V/V

270

—

1.5k

RL=

1kΩ

180

MAX4184/MAX4185

—

620

RL=

100Ω

205

—

750

RL=

150Ω

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

18 ______________________________________________________________________________________

The MAX4180–MAX4187 have a very low, 2nV/√Hz
noise voltage. The current noise at the positive input
(in+) is 4pA/√Hz, and the current noise at the inverting
input is 5pA/√Hz.

An example of the DC error calculations, using the
MAX4180 typical data and typical operating circuit
where RF= RG= 1.2kΩ (RF || RG= 600Ω) and
RS= 37.5Ω, gives the following:

Calculating the total output noise in a similar manner
yields:

With a 200MHz system bandwidth, this calculates to
102µV

RMS

(approximately 612µVp-p, choosing the six-

sigma value).

Video Line Driver

The MAX4180–MAX4187 are well suited to drive coaxi­al transmission lines when the cable is terminated at
both ends, as shown in Figure 6. Cable frequency
response can cause variations in the signal’s flatness.
See Table 1 for optimum RFand RGvalues.

Driving Capacitive Loads

The MAX4180–MAX4187 are optimized for AC perfor­mance. They are not designed to drive highly capaci­tive loads. Reactive loads decrease phase margin and
may produce excessive ringing and oscillation. Figure
7a shows a circuit that eliminates this problem. Placing
the small (usually 5Ω to 22Ω) isolation resistor, RS,
before the reactive load prevents ringing and
oscillation. At higher capacitive loads, the interaction of
the load capacitance and isolation resistor controls AC
performance. Figures 7b and 7c show the MAX4180
and MAX4181 frequency response with a 47pF capaci-

e11

4x10 x37.5 5x10 x255

2x10

e 4.8nV/ Hz

n(OUT)

12

2

12

2

9

2

n(OUT)

=+

()











+











+











=

−−

−

V 1x10 x37.5 2x10 x 255 1.5x10 x 1 1

V 4.1mV

OUT

66 3

OUT

=+++

=

−− −





















()











()

VIDEO
IN

VIDEO

OUT

75Ω

75Ω CABLE

VIDEO LINE DRIVER

75Ω CABLE

R

F

820Ω

R

G

820Ω

75Ω

75Ω

+5V

-5V

0.1µF

MAX4180

0.1µF

Figure 6. Video Line Driver

V

OUT

R

G

R

S

V

OUT

= -(RF / RG) x V

IN

V

IN

R

F

R

O

R

T

MAX4180–MAX4187

Figure 4a. Inverting Gain Configuration

V

OUT

R

G

R

S

V

OUT

= [1+ (RF / RG) V

IN

V

IN

R

F

R

O

R

T

MAX4180–MAX4187

Figure 4b. Noninverting Gain Configuration

R

G

IB­I

B

+

V

OUT

R

F

R

S

MAX4180–MAX4187

Figure 5. Output Offset Voltage

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 19

tive load. Note that in each case, gain peaking is
substantially reduced when the 20Ω resistor is used to
isolate the capacitive load from the amplifier output.

AC Testing/Performance

AC specifications on high-speed amplifiers are usually
guaranteed without 100% production testing. Since
these high-speed devices are sensitive to external para­sitics introduced when automatic handling equipment is
used, it is impractical to guarantee AC parameters
through volume production testing. These parasitics are
greatly reduced when using the recommended PC
board layout (like the Maxim EV kit). Characterizing the
part in this way more accurately represents the amplifi­er’s true AC performance. Some manufacturers guaran­tee AC specifications without clearly stating how this
guarantee is made. The AC specifications of the
MAX4180–MAX4187 are derived through worst-case
design simulations combined with a sample characteri­zation of 100 units. The AC performance distributions
along with the worst-case simulation results for

MAX4180 and MAX4181 are shown in Figures 8–11.
These distributions are repeatable provided that the
proper board layout and power-supply bypassing are
used (see

Layout and Power-Supply Bypassing

sec-

tion).

6
5
4
3
2
1
0

-4
1 10 100 1000

-2

-3

-1

FREQUENCY (MHz)

GAIN (dB)

MAX4181
V

IN

= 20mVp-p

A

V

= +1V/V

R

F

= 2.4kΩ

R

L

= 1kΩ || 47pF

RS = 20Ω

RS = 0Ω

Figure 7c. Frequency Response with Capacitive Load (with
and without Isolation Resistor)

Figure 7b. Frequency Response with Capacitive Load (with
and without Isolation Resistor)

6
5
4
3
2
1
0

-4
1 10 100 1000

-2

-3

-1

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

MAX4180
V

IN

= 20mVp-p

A

V

= +2V/V

R

F

= RG = 1.2kΩ

R

L

= 1kΩ || 47pF

RS = 0Ω

RS = 20Ω

Figure 7a. Using an Isolation Resistor (RS) for High Capacitive
Loads

R

G

V

IN

R

F

R

S

C

L

R

L

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

20 ______________________________________________________________________________________

0

80
70
60
50
40
30
20
10

300 320 330310 340 350 360 370 380 390 400 410 420 430 440

MAX4180 FIG.8c

RISING-EDGE SLEW RATE (V/µs)

NUMBER OF UNITS

SIMULATION

LOWER LIMIT

VS = ±5V
V

OUT

= 2V STEP

A

V

= +2V/V

R

L

= 1kΩ

100 UNITS

Figure 8d. MAX4180 Falling-Edge Slew-Rate Distribution
(Dual Supplies)

Figure 8c. MAX4180 Rising-Edge Slew-Rate Distribution
(Dual Supplies)

Figure 9a. MAX4180 -3dB Bandwidth Distribution
(Single Supply)

Figure 9b. MAX4180 ±0.1dB Bandwidth Distribution
(Single Supply)

0

20

10

50

40

30

60

100 130 145115 160 175 190 205 220 235 250 265 280 295 310 315 330 345

MAX4180 FIG.8a

-3dB BANDWIDTH (MHz)

NUMBER OF UNITS

SIMULATION

LOWER LIMIT

VS = ±5V
V

IN

= 20mVp-p

A

V

= +2V/V

R

L

= 1kΩ

100 UNITS

Figure 8a. MAX4180 -3dB Bandwidth Distribution
(Dual Supplies)

Figure 8b. MAX4180 ±0.1dB Bandwidth Distribution
(Dual Supplies)

25

20

15

10

NUMBER OF UNITS

5

0

0203010 40 50 60 70 80 90 100 110 120 130 140

SIMULATION

LOWER LIMIT

±0.1dB BANDWIDTH (MHz)

60

50

40

30

NUMBER OF UNITS

20

10

SIMULATION

LOWER LIMIT

VS = ±5V
V

= 2V STEP

OUT

= +2V/V

A

V

R

= 1kΩ

L

100 UNITS

VS = ±5V
V

= 20mVp-p

IN

A

= +2V/V

V

= 1kΩ

R

L

100 UNITS

MAX4180 FIG.8b

MAX4180 FIG.8d

0

250 270 280260 290 300 310 320 330 340 350 360 370 380 400390

80
70
60
50
40
30

NUMBER OF UNITS

20
10

0

SIMULATION

LOWER LIMIT

100 130 145115 160 175 190 205 220 235 250 280 310 330265 295 315 345

-3dB BANDWIDTH (MHz)

VS = +5V
V

= 20mVp-p

IN

A

= +2V/V

V

= 1kΩ

R

L

100 UNITS

40

MAX4180 FIG.9a

35
30
25
20

SIMULATION

15

NUMBER OF UNITS

10

5
0

0203010 40 50 60 70 80 90 100 110 120 130 140

LOWER LIMIT

FALLING-EDGE SLEW RATE (V/µs)

±0.1dB BANDWIDTH (MHz)

VS = +5V
V

= 20mVp-p

IN

= +2V/V

A

V

R

= 1kΩ

L

100 UNITS

MAX4180 FIG.9b

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 21

0

70

60

50

40

30

20

10

240 260 270250 340 350 360 370 380 390 400 410 420 430 440

MAX4180 FIG 9c

RISING-EDGE SLEW RATE (V/µs)

NUMBER OF UNITS

VS = +5V
V

OUT

= 2V STEP

A

V

= +2V/V

R

L

= 1kΩ

100 UNITS

SIMULATION

LOWER LIMIT

Figure 9c. MAX4180 Rising-Edge Slew-Rate Distribution
(Single Supply)

Figure 9d. MAX4180 Falling-Edge Slew-Rate Distribution
(Single Supply)

Figure 10b. MAX4181 ±0.1dB Bandwidth Distribution
(Dual Supplies)

Figure 10a. MAX4181 -3dB Bandwidth Distribution
(Dual Supplies)

Figure 10c. MAX4181 Rising-Edge Slew-Rate Distribution
(Dual Supplies)

Figure 10d. MAX4181 Falling-Edge Slew-Rate Distribution
(Dual Supplies)

60

50

40

30

SIMULATION

NUMBER OF UNITS

20

10

0

LOWER LIMIT

250 270 280260 290 300 310 320 330 340 350 360 370 380 400390

FALLING-EDGE SLEW RATE (V/µs)

VS = +5V
V

= 2V STEP

OUT

A

= +2V/V

V

R

= 1kΩ

L

100 UNITS

MAX4180 FIG.9d

35

30

25

20

15

NUMBER OF UNITS

10

5

0

160 180 190170 200 210 220 230 240 250 260 270 280

SIMULATION

VS = ±5V
V
A
R

100 UNITS

LOWER LIMIT

-3dB BANDWIDTH (MHz)

= 20mVp-p

IN

= +1V/V

V

= 1kΩ

L

80
70
60
50
40
30

NUMBER OF UNITS

20
10

0

180 200 210190 220 230 240 250 260 270 280 290 320310

RISING-EDGE SLEW RATE (V/µs)

SIMULATION

VS = ±5V
V

IN

A

V

R

L

100 UNITS

LOWER LIMIT

= 2V STEP

= +1V/V

= 1kΩ

18
16

MAX4180 FIG 10a

14
12
10

8

NUMBER OF UNITS

6
4
2
0

SIMULATION

LOWER LIMIT

0203010 40 50 60 70 80 90 100 110 120

±0.1dB BANDWIDTH (MHz)

60

MAX4180 FIG 10c

50

40

30

NUMBER OF UNITS

20

10

0

140 160 170150 180 190 200 210 220 230 240 250 270260

SIMULATION

LOWER LIMIT

FALLING-EDGE SLEW RATE (V/µs)

VS = ±5V
V

= 20mVp-p

IN

A

= +1V/V

V

R

= 1kΩ

L

100 UNITS

VS = ±5V
V

= 2V STEP

IN

A

= +1V/V

V

R

= 1kΩ

L

100 UNITS

MAX4180 FIG 10a

MAX4180 FIG 10d

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

22 ______________________________________________________________________________________

0

80
70
60
50
40
30
20
10

180 200 210190 220 230 240 250 260 270 280 300 310

MAX4180 FIG 11c

RISING-EDGE SLEW RATE (V/µs)

NUMBER OF UNITS

290

VS = +5V
V

IN

= 2V STEP

A

V

= +1V/V

R

L

= 1kΩ

100 UNITS

SIMULATION

LOWER LIMIT

Figure 11d. MAX4181 Falling-Edge Slew-Rate Distribution
(Single Supply)

Figure 11c. MAX4181 Rising-Edge Slew-Rate Distribution
(Single Supply)

VS = +5V
V

IN

= 20mVp-p

A

V

= +1V/V

R

L

= 1kΩ

100 UNITS

0

50

40

30

20

10

160 180 190170 200 210 220 230 240 250 260 270 280

MAX4180 FIG 11a

-3dB BANDWIDTH (MHz)

NUMBER OF UNITS

SIMULATION

LOWER LIMIT

Figure 11a. MAX4181 -3dB Bandwidth Distribution
(Single Supply)

Figure 11b. MAX4181 ±0.1dB Bandwidth Distribution
(Single Supply)

30

25

20

15

NUMBER OF UNITS

10

5

0

SIMULATION

LOWER LIMIT

0203010 40 50 60 70 80 90 100 110 120

±0.1dB BANDWIDTH (MHz)

100

90
80
70
60
50
40

NUMBER OF UNITS

30
20
10

0

140 160 170150 180 190 200 210 220 230 240 250 270260

SIMULATION

LOWER LIMIT

FALLING-EDGE SLEW RATE (V/µs)

VS = +5V
V

= 20mVp-p

IN

A

= +1V/V

V

R

= 1kΩ

L

100 UNITS

VS = +5V
V

= 2V STEP

IN

A

= +1V/V

V

R

= 1kΩ

L

100 UNITS

MAX4180 FIG 11b

MAX4180 FIG 11d

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

______________________________________________________________________________________ 23

_____________________________________________Pin Configurations (continued)

14
13
12
11
10

9

8

1

2

3
4
5
6
7

V

CC

OUTB
INB­INB+V

EE

INA+

INA-

OUTA

MAX4183
MAX4185

N.C.
SHDNB
N.C.N.C.

SHDNA

N.C.

SO

DUAL

DUAL QUAD

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUTD
IND­IND+
V

EE

V

CC

INA+

INA-

OUTA

MAX4186
MAX4187

INC+
INC­OUTCOUTB

INB-

INB+

SO

QUAD

SINGLE

OUT

N.C.

V

EE

1

2

87SHDN

V

CC

IN-

IN+

N.C.

SO

3

4

6

5

MAX4180
MAX4181

DUAL

INB-

INB+

V

EE

1

2

87V

CC

OUTB

INA-

INA+

OUTA

SO

3

4

6

5

MAX4182
MAX4184

1

2

3

4

5

10

9
8
7
6

V

CC

OUTB
INB­INB+V

EE

INA+

INA-

OUTA

MAX4183
MAX4185

µMAX

SHDNBSHDNA

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.

MAX4186
MAX4187

QSOP

INA-

INA+

INB+

V

CC

INB-

OUTB

N.C.

TOP VIEW

MAX4180–MAX4187

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown

6LSOT.EPS

___________________Chip Information

________________________________________________________Package Information

MAX4180/MAX4181

TRANSISTOR COUNT: 83
SUBSTRATE CONNECTED TO V

EE

MAX4182–MAX4185

TRANSISTOR COUNT: 166
SUBSTRATE CONNECTED TO V

EE

MAX4186/MAX4187

TRANSISTOR COUNT: 235
SUBSTRATE CONNECTED TO V

EE

_Ordering Information (continued)

—

—

—

—

—

—

—

—

—

—

—

AAAC

SOT TOP

MARK

16 QSOP-40°C to +85°CMAX4187EEE

14 SO-40°C to +85°C

MAX4187ESD

16 QSOP-40°C to +85°CMAX4186EEE

14 SO-40°C to +85°C

MAX4186ESD

14 SO-40°C to +85°CMAX4185ESD

10 µMAX*-40°C to +85°C

MAX4185EUB

8 SO-40°C to +85°C

MAX4184ESA

14 SO-40°C to +85°CMAX4183ESD

10 µMAX*-40°C to +85°C

MAX4183EUB

8 SO

8 SO

6 SOT23

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX4182ESA

MAX4181ESA

MAX4181EUT

PART

*

Contact factory for availability.

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.

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