Datasheet MAX4189EEE, MAX4188ESD, MAX4188EEE, MAX4190ESD, MAX4190EEE Datasheet (Maxim)

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General Description

The MAX4188/MAX4189/MAX4190 are low-power, current-feedback video amplifiers featuring fast disable/enable times and low switching transients. The triple MAX4188 and the single MAX4190 are optimized for applications with closed-loop gains of +2V/V (6dB) or greater and provide a -3dB bandwidth of 200MHz and 185MHz, respectively. The triple MAX4189 is optimized for closed-loop applications with gains of +1V/V (0dB) or greater and provides a 250MHz -3dB bandwidth. These amplifiers feature 0.1dB gain flatness up to 80MHz with differential gain and phase errors of 0.03% and 0.05°. These features make the MAX4188 family ideal for video applications.

The MAX4188/MAX4189/MAX4190 operate from a +5V single supply or from ±2.25V to ±5.5V dual supplies. These amplifiers consume only 1.5mA per amplifier and are capable of delivering ±55mA of output current, making them ideal for portable and battery-powered equipment.

The MAX4188/MAX4189/MAX4190 have a high-speed disable/enable mode that isolates the inputs, places the outputs in a high-impedance state, and reduces the supply current to 450µA per amplifier. Each amplifier can be disabled independently. High off isolation, low switching transient, and fast enable/disable times (120ns/35ns) allow these amplifiers to be used in a wide range of multiplexer applications. A settling time of 22ns to 0.1%, a slew rate of up to 350V/µs, and low distortion make these devices useful in many generalpurpose, high-speed applications.

The MAX4188/MAX4189 are available in a tiny 16-pin QSOP package, and the MAX4190 is available in a space-saving 8-pin µMAX package.

Applications

High-Definition Surveillance Video High-Speed Switching/Multiplexing Portable/Battery-Powered Video/Multimedia

Systems High-Speed Analog-to-Digital Buffers Medical Imaging High-Speed Signal Processing Professional Cameras CCD Imaging Systems RGB Distribution Amplifiers

Features

♦ Low Supply Current: 1.5mA per Amplifier ♦ Fast Enable/Disable Times: 120ns/35ns ♦ Very Low Switching Transient: 45mV

p-p

♦ High Speed

200MHz -3dB Small-Signal Bandwidth

(MAX4188, A

VCL

≥ +2)

250MHz -3dB Small-Signal Bandwidth

(MAX4189, A

VCL

≥ +1)

185MHz -3dB Small-Signal Bandwidth

(MAX4190, A

VCL

≥ +2)

♦ High Slew Rate

350V/µs (MAX4188, A

VCL

≥ +2)

175V/µs (MAX4189, A

VCL

≥ +1)

♦ Excellent Video Specifications

85MHz -0.1dB Gain Flatness (MAX4190) 30MHz -0.1dB Gain Flatness (MAX4189) Differential Gain/Phase Errors

0.03%/0.05° (MAX4188)

♦ Low-Power Disable Mode

Inputs Isolated, Outputs Placed in High-Z Supply Current Reduced to 450µA per Amplifier

♦ Fast Settling Time of 22ns to 0.1% ♦ Low Distortion

70dB SFDR (f

c

= 5MHz, VO= 2V

p-p

, MAX4188)

♦ Available in Space-Saving Packages

16-Pin QSOP (MAX4188/MAX4189) 8-Pin µMAX (MAX4190)

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

________________________________________________________________

Maxim Integrated Products

1

19-1369; Rev 0; 7/98

EVALUATION KIT

AVAILABLE

Ordering Information continued at end of data sheet.

Ordering Information

Pin Configuration appears at end of data sheet.

PART TEMP. RANGE PIN-PACKAGE

MAX4188ESD

-40°C to +85°C 14 SO

MAX4188EEE -40°C to +85°C 16 QSOP

8-pin µMAX/SO1AV≥ +2V/VMAX4190

14-pin SO, 16-pin QSOP

3AV≥ +1V/VMAX4189

14-pin SO, 16-pin QSOP

3AV≥ +2V/VMAX4188

PIN-PACKAGE

AMPLIFIERS

PER PKG.

OPTIMIZED

FOR:

PART

Selector Guide

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS—Dual Supplies

(VCC= +5V; VEE= -5V; IN+ = 0; DISABLE_ ≥ 3.2V; MAX4188: AV= +2V/V, RF = RG= 910Ω for RL= 1kΩ and RF= RG= 560Ω for R

L

= 150Ω; MAX4189: AV= +1V/V, RF= 1600Ω for RL= 1kΩ and RF= 1100Ω for RL= 150Ω; MAX4190: AV= +2V/V, RF= RG= 1300Ω for R

L

= 1kΩ, RF= RG= 680Ω for RL= 150Ω; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are specified 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 (VCCto VEE)................................................+12V

IN_+, IN_-, DISABLE_ Voltage.........(V

EE

- 0.3V) to (VCC+ 0.3V)

Differential Input Voltage (IN_+ to IN_-)..............................±1.5V

Maximum Current into IN_+ or IN_-..................................±10mA

Output Short-Circuit Current Duration........................Continuous

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.88mW/°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

SYMBOL

CONDITIONS UNITS

Operating Supply Voltage Inferred from PSRR tests V

Input Offset Voltage V

OS

VCM= 0 (Note 1) ±1 ±6 mV

Input Offset Voltage Tempco TC

VOS

µV/°C Input Offset Voltage Matching mV Input Bias Current (Positive Input) I

B+

µA

Input Bias Current (Negative Input) I

B-

µA

Input Resistance (Positive Input) R

IN+

-3.1V ≤ VCM≤ 3.1V,  VIN+ - VIN- ≤1V

kΩ

Input Resistance (Negative Input) R

IN-

Ω

Input Capacitance (Positive Input) C

IN

pF

Common-Mode Rejection Ratio CMRR -3.1V ≤ VCM≤ 3.1V dB Open-Loop Transresistance T

R

-3.1V ≤ V

OUT

≤ 3.1V, RL= 1kΩ

-2.8V ≤ V

OUT

≤ 2.8V, RL= 150Ω

MΩ

Output Voltage Swing V

SW

RL= 1kΩ

V

RL= 150Ω

Output Current I

OUT

RL= 30Ω mA

Output Short-Circuit Current I

SC

mA

Output Resistance R

OUT

Ω

Disabled Output Leakage Current I

OUT(OFF)

DISABLE_ ≤ VIL, V

OUT

≤ ±3.5V (Note 2)

µA

Disabled Output Capacitance C

OUT(OFF)

DISABLE_ ≤ VIL, V

OUT

≤ ±3.5V

pF

DISABLE Low Threshold

V

IL

(Note 3) V

DISABLE High Threshold

V

IH

(Note 3) V

MIN TYP MAX

±2.25 ±5.5

±10

VCC- 3

±1 ±1 ±10 ±2 ±12

100 350

300

2.5

56 68

VCC- 1.8

1 7

0.3 2 ±3.5 ±4.0 ±3.0 ±3.3

±20 ±55

±60

0.2

±0.8 ±5

5

PARAMETER

DISABLE Input Current

I

IN

VEE≤ DISABLE_ ≤ V

CC

0.1 2 µA

Power-Supply Rejection Ratio (VCC) PSRR+ VEE= -5V, VCC= 4.5V to 5.5V 60 75 dB

Quiescent Supply Current (per Amplifier) I

S

RL= open 1.5 1.85 mA

Disabled Supply Current (per Amplifier) I

S(OFF)

DISABLE_ ≤ VIL, RL= open

0.45 0.65 mA

Power-Supply Rejection Ratio (VEE) PSRR- VCC= 5V, VEE= -4.5V to -5.5V 60 73 dB

Input Voltage Range V

CM

Guaranteed by CMRR test ±3.1 ±3.4 V

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS—Single Supply

(VCC= +5V; VEE= 0; IN+ = 2.5V; DISABLE_ ≥ 3.2V; RLto VCC/ 2; MAX4188: AV= +2V/V, RF= RG= 1.1kΩ for RL = 1kΩ and RF= R

G

= 620Ω for RL= 150Ω; MAX4189: AV= +1V/V, RF= 1500Ω for RL= 1kΩ and RF= 1600Ω for RL= 150Ω; MAX4190: AV= +2V/V, RF= R

G

= 1300Ω for RL= 1kΩ, RF= RG= 680Ω for RL= 150Ω; TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are specified at

T

A

= +25°C.)

RL= 30Ω

RL= open

RL= 150Ω

RL= 1kΩ

mA

1.45V ≤ V

OUT

≤ 3.55V, RL= 150Ω

1.5 1.85

1.3V ≤ V

OUT

≤ 3.7V, RL= 1kΩ

1.5V ≤ VCM≤ 3.5V

1.6V ≤ VCM≤ 3.4V,  V

IN+

- V

IN-

 ≤ 1V

VCM= 2.5V (Note 1)

Guaranteed by CMRR test

I

S

Quiescent Supply Current (per Amplifier)

DISABLE_ ≤ VIL, RL= open

Inferred from PSRR tests

CONDITIONS

Ω0.2R

OUT

Output Resistance

mA±50I

SC

Output Short-Circuit Current

mA±16 ±28I

OUT

Output Current

V

1.4 to 1.15 to

3.6 3.85

V

SW

mA

1.2 to 0.9 to

3.8 4.1

Output Voltage Swing

MΩ

0.2 1.0

T

R

Open-Loop Transresistance

1.0 6.5

0.45 0.65

dB48 65CMRRCommon-Mode Rejection Ratio

pF2.5C

IN

Input Capacitance (Positive Input)

Ω300R

IN-

Input Resistance (Negative Input)

kΩ100 350R

IN+

Input Resistance (Positive Input)

µA±2 ±12I

B-

Input Bias Current (Negative Input)

µA±1 ±10I

B+

Input Bias Current (Positive Input)

I

S(OFF)

Disabled Supply Current (per Amplifier)

mV±1Input Offset Voltage Matching

µV/°C±10TC

VOS

Input Offset Voltage Tempco

mV±1.5 ±6.0V

OS

Input Offset Voltage

V

1.6 to 1.3 to

3.4 3.7

V

CM

Input Voltage Range

V4.5 5.5Operating Supply Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

DISABLE_ ≤ VIL, 1.2V ≤ V

OUT

≤ 3.8V

DISABLE_ ≤ VIL, 1.2V ≤ V

OUT

≤ 3.8V (Note 2)

pF5C

OUT(OFF)

Disabled Output Capacitance

µA0.8 ±5I

OUT(OFF)

Disabled Output Leakage Current

(Note 3)

VVCC- 1.8V

IH

DISABLE High Threshold

VVCC- 3V

IL

DISABLE Low Threshold

VCC= 4.5V to 5.5V

0 ≤ DISABLE_ ≤ V

CC

dB60 75PSRR+

Power-Supply Rejection Ratio (V

CC

)

µA0.1 2I

IN

DISABLE Input Current

V/µs

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4188)

(VCC= +5V, VEE= -5V, VIN= 0, DISABLE_ ≥ 3V, AV= +2V/V, RF= RG= 910Ω for RL = 1kΩ or RF= RG= 560Ω for RL = 150Ω; T

A

= +25°C, unless otherwise noted.)

Positive input Negative input

NTSC

RL= 1kΩ

f = 10kHz

NTSC

RL= 150Ω

pA/√Hz

RL= 1kΩ

fC = 5MHz, V

OUT

= 2Vp-p

fC = 5MHz, V

OUT

= 2Vp-p

RL= 1kΩ

V

OUT

= 4V step

i

n

fC = 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2Vp-p

RL= 150Ω RL= 1kΩ RL= 150Ω

RL= 1kΩ

RL= 150Ω

V

OUT

= 4V step

CONDITIONS

RL= 1kΩ RL= 150Ω

%

0.04

DGDifferential Gain Error

0.03

RL= 150Ω RL= 1kΩ

degrees

0.32

DPDifferential Phase Error

0.05

RL= 150Ω RL= 1kΩ

dBc

-56

Third Harmonic Distortion

-73

RL= 150Ω RL= 1kΩ

dBc

-66

Second Harmonic Distortion

-70

RL= 150Ω

Input Noise Current Density

dB

56

SFDRSpurious-Free Dynamic Range

70

ns

12

Rise/Fall Time

0.25

4

MHz

160

BW

-3dB

200

Small-Signal -3dB Bandwidth

10

ns22t

S

Settling Time to 0.1%

350

MHz

100

BW

LS

Large-Signal -3dB Bandwidth

dB

0.1

Peaking

60

MHz

80

BW

0.1dB

Bandwidth for 0.1dB Flatness

100

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz

f = 10kHz

Ω4Z

OUT

Output Impedance

nV/√Hz

2e

n

Input Noise Voltage Density

f = 10MHz, input referred

dB-65All Hostile Off Isolation

dB-55Crosstalk

Delay from DISABLE to 90% of V

OUT

,

V

IN

= 0.5V

ns120t

ON

Amplifier Enable Time

MHz100Gain Matching to 0.1dB

Positive transient

Delay from DISABLE to 10% of V

OUT

,

V

IN

= 0.5V

30

ns35t

OFF

Amplifier Disable Time

Negative transient

mV

15

Disable/Enable Switching Transient

5

Rise time Fall time

V

OUT

= 4V step,

RL= 150Ω

V/µs

280

SRSlew Rate

Positive slew Negative slew

V/µs

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

_______________________________________________________________________________________ 5

Positive input Negative input

NTSC

RL= 1kΩ

f = 10kHz

NTSC

RL= 150Ω

pA/√Hz

RL= 1kΩ

fC = 5MHz, V

OUT

= 2Vp-p

5

fC = 5MHz, V

OUT

= 2Vp-p

RL= 1kΩ

V

OUT

= 4V step

i

n

fC = 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2Vp-p

RL= 150Ω RL= 1kΩ RL= 150Ω

RL= 1kΩ

RL= 150Ω

V

OUT

= 4V step

CONDITIONS

RL= 1kΩ RL= 150Ω

%

0.18

DGDifferential Gain Error

0.07

RL= 150Ω RL= 1kΩ

degrees

0.66

DPDifferential Phase Error

0.02

RL= 150Ω RL= 1kΩ

dBc

-51

Third Harmonic Distortion

-70

RL= 150Ω RL= 1kΩ

dBc

-63

Second Harmonic Distortion

-65

RL= 150Ω

Input Noise Current Density

dB

51

SFDRSpurious-Free Dynamic Range

65

ns

22

Rise/Fall Time

1.4

4

MHz

210

BW

-3dB

250

Small-Signal -3dB Bandwidth

20

ns28t

S

Settling Time to 0.1%

175

MHz

55

BW

LS

Large-Signal -3dB Bandwidth

dB

0.15

Peaking

7

MHz

30

BW

0.1dB

Bandwidth for 0.1dB Flatness

60

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz

f = 10kHz

Ω4Z

OUT

Output Impedance

nV/√Hz

2e

n

Input Noise Voltage Density

f = 10MHz, input referred

dB-55All Hostile Off Isolation

dB-57Crosstalk

Delay from DISABLE to 90% of V

OUT

,

V

IN

= 0.5V

ns120t

ON

Amplifier Enable Time

MHz24Gain Matching to 0.1dB

Positive transient

Delay from DISABLE to 10% of V

OUT

,

V

IN

= 0.5V

70

ns40t

OFF

Amplifier Disable Time

Negative transient

mV

110

Disable/Enable Switching Transient

AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4189)

(VCC= +5V, VEE= -5V, VIN= 0, DISABLE_ ≥ 3V, AV= +1V/V, RF= 1600Ω for RL= 1kΩ and RF= 1100Ω for RL= 150Ω; TA= +25°C, unless otherwise noted.)

V

OUT

= 4V step,

RL= 150Ω

V/µs

150

SRSlew Rate

Positive slew Negative slew

Rise time Fall time

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

6 _______________________________________________________________________________________

RL= 1kΩ

f = 10kHz

NTSC

RL= 150Ω

nV/√Hz

RL= 1kΩ

fC = 5MHz, VO= 2Vp-p

RL= 1kΩ

VO= 2V step

e

n

fC = 5MHz, VO= 2Vp-p

Rise time

VO= 2Vp-p

RL= 150Ω

RL= 1kΩ

RL= 150Ω

VO= 4V step, RL= 150Ω

CONDITIONS

VO= 4V step, RL= 150Ω

V/µs

270

SRSlew Rate

Positive slew

RL= 1kΩ RL= 150Ω

Negative slew

RL= 150Ω RL= 1kΩ

degrees

0.07

DGDifferential Gain Error

Fall time

0.03

RL= 150Ω RL= 1kΩ

dBc

-61

Third Harmonic Distortion

-73

RL= 150Ω

dBc

-55

Second Harmonic Distortion

-65

Input Noise Voltage Density

dB

55

Spurious-Free Dynamic Range

61

ns

12

t

R

Rise/Fall Time

0.1

2

MHz

150

BW

SS

185

Small-Signal -3dB Bandwidth

10

ns22t

S

Settling Time to 0.1%

340

MHz

95

BW

LS

Large-Signal -3dB Bandwidth

dB

0.1

Peaking

85

MHz

75

BW

LS

Bandwidth for 0.1dB Flatness

95

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz

f = 10kHz

Ω4Z

OUT

Output Impedance

4

Input Noise Current Density

f = 10MHz, input referred dB-60All Hostile Off Isolation

Positive transient 30

ns120t

ON

Turn-On Time from DISABLE

Negative transient

mV

15

BW

LS

Disable/Enable Switching Transient

RL= 1kΩ RL= 150kΩ

t

F

NTSC degrees

0.45

DPDifferential Phase Error

0.06RL= 1kΩ

RL= 150Ω

pA/√Hz

5

Positive input Negative input

AC & DYNAMIC PERFORMANCE—Dual Supplies (MAX4190)

(VCC= +5V, VEE= -5V, VIN= 0, AV= +2V/V; RF= RG= 1300Ω for RL= 1kΩ and RF= RG= 680Ω for RL= 150Ω, T

A

= +25°C, unless otherwise noted.)

ns35t

OFF

Turn-Off Time from DISABLE

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

_______________________________________________________________________________________ 7

V

OUT

= 2V step

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4188)

(VCC= +5V, VEE= 0, VIN= 2.5V, DISABLE_ ≥ 3V, RLto VCC/ 2, AV= +2V/V, RF= RG= 1.1kΩ for RL= 1kΩ to VCC/ 2 and RF= RG = 620Ω for R

L

= 150Ω; TA= +25°C, unless otherwise noted.)

Positive input Negative input

NTSC

RL= 1kΩ

f = 10kHz

NTSC

RL= 150Ω

pA/√Hz

RL= 1kΩ

fC = 5MHz, V

OUT

= 2Vp-p

5

fC = 5MHz, V

OUT

= 2Vp-p

RL= 1kΩ

V

OUT

= 2V step

i

n

fC = 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2Vp-p

RL= 150Ω RL= 1kΩ RL= 150Ω

RL= 1kΩ

RL= 150Ω

V

OUT

= 2V step

CONDITIONS

RL= 1kΩ RL= 150Ω

%

0.05

DGDifferential Gain Error

0.02

RL= 150Ω RL= 1kΩ

degrees

0.34

DPDifferential Phase Error

0.06

RL= 150Ω RL= 1kΩ

dBc

-56

Third Harmonic Distortion

-66

RL= 150Ω RL= 1kΩ

dBc

-59

Second Harmonic Distortion

-76

RL= 150Ω

Input Noise Current Density

dB

56

SFDRSpurious-Free Dynamic Range

66

ns

9

Rise/Fall Time

0.1

4

MHz

145

BW

-3dB

185

Small-Signal -3dB Bandwidth

8

ns20t

S

Settling Time to 0.1%

V/µs300

MHz

80

BW

LS

Large-Signal -3dB Bandwidth

dB

0.1

Peaking

110

MHz

65

BW

0.1dB

Bandwidth for 0.1dB Flatness

80

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz

f = 10kHz

Ω4Z

OUT

Output Impedance

nV/√Hz

2e

n

Input Noise Voltage Density

f = 10MHz, input referred

dB-65All Hostile Off Isolation

dB-55Crosstalk

Delay from DISABLE to 90% of V

OUT

,

V

IN

= 3V

ns120t

ON

Amplifier Enable Time

MHz40Gain Matching to 0.1dB

Positive transient

Delay from DISABLE to 10% of V

OUT

,

V

IN

= 3V

30

ns35t

OFF

Amplifier Disable Time

Negative transient

mV

15

Disable/Enable Switching Transient

Rise time Fall time

V

OUT

= 2V step,

RL= 150Ω

V/µs230

SRSlew Rate

Positive slew Negative slew

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

8 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4189)

(VCC= +5V, VEE= 0, VIN= 2.5V, DISABLE_ ≥ 3V, RL to VCC/ 2, AV= +1V/V, RF= 1500Ω for RL= 1kΩ and RF= 1600Ω for RL= 150Ω; T

A

= +25°C, unless otherwise noted.)

Positive input Negative input

NTSC

RL= 1kΩ

f = 10kHz

NTSC

RL= 150Ω

pA/√Hz

RL= 1kΩ

fC = 5MHz, V

OUT

= 2Vp-p

5

fC = 5MHz, V

OUT

= 2Vp-p

RL= 1kΩ

i

n

fC = 5MHz, V

OUT

= 2Vp-p

V

OUT

= 2Vp-p

RL= 150Ω RL= 1kΩ RL= 150Ω

RL= 1kΩ

RL= 150Ω

V

OUT

= 2V step

CONDITIONS

RL= 1kΩ RL= 150Ω

%

0.17

DGDifferential Gain Error

0.06

RL= 150Ω RL= 1kΩ

degrees

0.66

DPDifferential Phase Error

0.04

RL= 150Ω RL= 1kΩ

dBc

-47

Third Harmonic Distortion

-57

RL= 150Ω RL= 1kΩ

dBc

-54

Second Harmonic Distortion

-58

RL= 150Ω

Input Noise Current Density

dB

47

SFDRSpurious-Free Dynamic Range

57

ns

15

Rise/Fall Time

1.4

4

MHz

190

BW

-3dB

230

Small-Signal -3dB Bandwidth

12

ns25t

S

Settling Time to 0.1%

160

MHz

45

BW

LS

Large-Signal -3dB Bandwidth

dB

0.15

Peaking

7

MHz

40

BW

0.1dB

Bandwidth for 0.1dB Flatness

50

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz

f = 10kHz

Ω4Z

OUT

Output Impedance

nV/√Hz

2e

n

Input Noise Voltage Density

f = 10MHz, input referred

dB-55All Hostile Off Isolation

dB-57Crosstalk

Delay from DISABLE to 90% of V

OUT

,

V

IN

= 3V

ns120t

ON

Amplifier Enable Time

MHz25Gain Matching to 0.1dB

Positive transient

Delay from DISABLE to 10% of V

OUT

,

V

IN

= 3V

70

ns40t

OFF

Amplifier Disable Time

Negative transient

mV

110

Disable/Enable Switching Transient

Note 1: Input Offset Voltage does not include the effect of I

BIAS

flowing through RF/RG.

Note 2: Does not include current through external feedback network. Note 3: Over operating supply-voltage range.

Positive slew

V

OUT

= 2V step

V

OUT

= 2V step,

RL= 150Ω

Negative slew

V/µs

135

SRSlew Rate

Rise time Fall time

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

_______________________________________________________________________________________ 9

RL= 1kΩ

NTSC

RL= 150Ω

RL= 1kΩ

fC = 5MHz, VO= 2Vp-p

RL= 1kΩ

Rise time

fC = 5MHz, VO= 2Vp-p

Fall time

VO= 2Vp-p

RL= 150Ω RL= 1kΩ RL= 150Ω

RL= 1kΩ

RL= 150Ω

VO= 2V step, R

L

= 150Ω

CONDITIONS

Positive slew

VO= 2V step

VO= 2V step, RL= 150Ω

Negative slew

V/µs

220

RL= 1kΩ RL= 150Ω

SR

RL= 150Ω RL= 1kΩ

%

0.08

DGDifferential Gain Error

Slew Rate

0.02

RL= 150Ω RL= 1kΩ

dBc

-60

Third Harmonic Distortion

-68

RL= 150Ω

dBc

-55

Second Harmonic Distortion

-59

dB

55

Spurious-Free Dynamic Range

59

ns

9

t

R

t

F

Rise/Fall Time

0.1

MHz

135

BW

-3dB

165

Small-Signal -3dB Bandwidth

8

ns20t

S

Settling Time to 0.1%

290

MHz

75

BW

LS

Large-Signal -3dB Bandwidth

dB

0.1

Peaking

70

MHz

65

BW

0.1dB

Bandwidth for 0.1dB Flatness

75

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 10MHz Ω4Z

OUT

Output Impedance

f = 10kHzInput Noise Voltage Density

f = 10MHz, input referred, RL= 150Ω dB-60All Hostile Off Isolation

ns120t

ON

Turn-On Time from DISABLE

Positive transient 30 Negative transient

mV

15

BW

LS

Disable/Enable Switching Transient

nV/√Hz

NTSC degrees

0.43

DPDifferential Phase Error

0.07RL= 1kΩ

RL= 150Ω

AC & DYNAMIC PERFORMANCE—Single Supply (MAX4190)

(VCC= +5V, VEE= 0, VIN= 0, AV= +2V/V; RF= RG= 1500Ω for RL= 1kΩ and RF= RG= 750Ω for RL= 150Ω, T

A

= +25°C, unless otherwise noted)

pA/√Hz

5Negative input

Positive input

f = 10kHz

4

i

n

Input Noise Current Density

2

ns35t

OFF

Turn-Off Time from DISABLE

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

10 ______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

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

9

0

1 100010010

MAX4188 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

3

1

7

5

10

4

2

8

6

MAX4188toc01

FREQUENCY (MHz)

GAIN (dB)

RF = RG = 390Ω R

L

= 100Ω

RF = RG = 910kΩ R

L

= 1kΩ

RF = RG = 560Ω R

L

= 150Ω

V

IN

= 20mVp-p

A

V

= +2V/V

9

0

1 100010010

MAX4188 SMALL-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

3

1

7

5

10

4

2

8

6

MAX4188toc02

FREQUENCY (MHz)

GAIN (dB)

RF = RG = 620Ω R

L

= 150Ω

RF = RG = 1.1kΩ R

L

= 1kΩ

RF = RG = 430Ω R

L

= 100Ω

VEE = 0V V

IN

= 20mVp-p

A

V

= +2V/V

0.3

-0.6 1 100010010

MAX4188 GAIN FLATNESS

vs. FREQUENCY (DUAL SUPPLIES)

-0.3

-0.5

0.1

-0.1

0.4

-0.2

-0.4

0.2

0

MAX4188toc03

FREQUENCY (MHz)

GAIN (dB)

V

IN

= 20mVp-p

A

V

= +2V/V

RF = RG = 910Ω RL = 1kΩ

RF = RG = 620Ω RL = 150Ω

RF = RG = 390Ω R

L

= 100Ω

3

-6 1 100010010

MAX4189 SMALL-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-3

-5

1

-1

4

-2

-4

2

0

MAX4188toc04

FREQUENCY (MHz)

GAIN (dB)

V

IN

= 20mVp-p

A

V

= +1V/V

RF = 1.1kΩ

R

L

= 150Ω

RF = 1.6kΩ R

L

= 1kΩ

RF = 680Ω R

L

= 100Ω

9

0

1 100010010

MAX4188 LARGE-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

3

1

7

5

10

4

2

8

6

MAX4188toc07

FREQUENCY (MHz)

GAIN (dB)

RF = RG = 560Ω R

L

= 150Ω

V

IN

= 1Vp-p

A

V

= +2V/V

RF = RG = 910Ω R

L

= 1kΩ

3

-6 1 100010010

MAX4189 SMALL-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-3

-5

1

-1

4

-2

-4

2

0

MAX4188toc05

FREQUENCY (MHz)

GAIN (dB)

V

EE

= 0

V

IN

= 20mVp-p

A

V

= +1V/V

RF = 1.5kΩ R

L

= 1kΩ

R

F

= 1.6kΩ

R

L

= 150Ω

RF = 910Ω R

L

= 100Ω

0.1

-0.8 1 100010010

MAX4189 GAIN FLATNESS

vs. FREQUENCY (DUAL SUPPLIES)

-0.5

-0.7

-0.1

-0.3

0.2

-0.4

-0.6

0

-0.2

MAX4188toc06

FREQUENCY (MHz)

GAIN (dB)

VIN = 20mVp-p A

V

= +1V/V

RF = 1.1kΩ R

L

= 150Ω

RF = 680Ω R

L

= 100Ω

9

0

1 100010010

MAX4188 LARGE-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

3

1

7

5

10

4

2

8

6

MAX4188toc08

FREQUENCY (MHz)

GAIN (dB)

RF = RG = 620Ω R

L

= 150Ω

RF = RG = 1.1kΩ R

L

= 1kΩ

V

EE

= 0

V

IN

= 1Vp-p

A

V

= +2V/V

2.0

-2.5 1 100010010

MAX4188 SMALL-SIGNAL GAIN

MATCHING vs. FREQUENCY

-1.0

-2.0

1.0

0

2.5

-0.5

-1.5

1.5

0.5

MAX4188toc09

FREQUENCY (MHz)

GAIN MATCHING (dB)

CH2-CH3

V

IN

= 20mVp-p

R

F

= RG = 750Ω

R

L

= 1kΩ

A

V

= +2V/V

CH1-CH3

CH1-CH2

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

______________________________________________________________________________________

11

3

-6 1 100010010

MAX4189 LARGE-SIGNAL GAIN

vs. FREQUENCY (DUAL SUPPLIES)

-3

-5

1

-1

4

-2

-4

2

0

MAX4188toc10

FREQUENCY (MHz)

GAIN (dB)

V

IN

= 2Vp-p

A

V

= 1V/V

RF = 1.6kΩ R

L

= 1kΩ

RF = 1.1kΩ R

L

= 150Ω

3

-6 1 100010010

MAX4189 LARGE-SIGNAL GAIN

vs. FREQUENCY (SINGLE SUPPLY)

-3

-5

1

-1

4

-2

-4

2

0

MAX4188toc11

FREQUENCY (MHz)

GAIN (dB)

V

EE

= 0

V

IN

= 2Vp-p

A

V

= +1V/V

RF = 1.6kΩ R

L

= 150Ω

RF = 1.5kΩ R

L

= 1kΩ

2.0

-2.5 1 100010010

MAX4189 SMALL-SIGNAL GAIN

MATCHING vs. FREQUENCY

-1.0

-2.0

1.0

0

2.5

-0.5

-1.5

1.5

0.5

MAX4188toc12

FREQUENCY (MHz)

GAIN (dB)

V

IN

= 2Vp-p

R

F

= 1.6kΩ

R

L

= 1kΩ

A

V

= +1V/V

CH_1–CH_3

CH_1–CH_2

CH_3–CH_2

-10

-100

0.1 100101

MAX4188 HARMONIC DISTORTION

vs. FREQUENCY (DUAL SUPPLIES)

-70

-90

-30

-50

0

-60

-80

-20

-40

MAX4188toc13

FREQUENCY (MHz)

DISTORTION (dBc)

V

OUT

= 2Vp-p

2ND (RL = 150Ω)

3RD (RL = 150Ω)

3RD (RL = 1kΩ)

2ND (RL = 1kΩ)

-10

-100

0.1 100101

MAX4189 HARMONIC DISTORTION

vs. FREQUENCY (DUAL SUPPLIES)

-70

-90

-30

-50

0

-60

-80

-20

-40

MAX4188toc16

FREQUENCY (MHz)

DISTORTION (dBc)

V

OUT

= 2Vp-p

2ND (RL = 150Ω)

3RD (RL = 150Ω)

2ND (RL = 1kΩ)

3RD (RL = 1kΩ)

-10

-100

0.1 100101

MAX4188 HARMONIC DISTORTION

vs. FREQUENCY (SINGLE SUPPLY)

-70

-90

-30

-50

0

-60

-80

-20

-40

MAX4188toc14

FREQUENCY (MHz)

DISTORTION (dBc)

V

OUT

= 2Vp-p

2ND (RL = 150Ω)

3RD (RL = 150Ω)

2ND (RL = 1kΩ)

3RD (RL = 1kΩ)

-10

-80 1 100010010

MAX4188 CROSSTALK vs.

FREQUENCY (DUAL SUPPLIES)

-70

-30

-50

0

-60

-20

-40

MAX4188toc15

FREQUENCY (MHz)

CROSSTALK (dBc)

V

OUT

= 2Vp-p

R

L

= 150Ω

-10

-100

0.1 100101

MAX4189 HARMONIC DISTORTION

vs. FREQUENCY (SINGLE SUPPLY)

-70

-90

-30

-50

0

-60

-80

-20

-40

MAX4188toc17

FREQUENCY (MHz)

DISTORTION (dBc)

V

OUT

= 2Vp-p

2ND (RL = 150Ω)

3RD (RL = 150Ω)

2ND (RL = 1kΩ)

3RD (RL = 1kΩ)

-10

-80 1 100010010

MAX4189 CROSSTALK vs.

FREQUENCY (DUAL SUPPLIES)

-70

-30

-50

0

-60

-20

-40

MAX4188toc18

FREQUENCY (MHz)

CROSSTALK (dBc)

V

OUT

= 2Vp-p

R

L

= 150Ω

____________________________________Typical Operating Characteristics (continued)

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

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

12 ______________________________________________________________________________________

____________________________________Typical Operating Characteristics (continued)

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

3.4

3.2

2.8

2.4

2.0

1.6

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

INPUT VOLTAGE-NOISE

DENSITY vs. FREQUENCY

1.8

MAX4180 TOC19

FREQUENCY (Hz)

2.2

2.6

3.0

VOLTAGE-NOISE DENSITY (nV/√Hz)

4

12

8

20

16

24

28

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

TOTAL VOLTAGE-NOISE DENSITY

vs. FREQUENCY (INPUT REFERRED)

MAX4188toc20

FREQUENCY (Hz)

TOTAL VOLTAGE-NOISE DENSITY (nV/√Hz)

V

OUT

V

IN

910k

MAX4188

1 2

0

100

50

150

250

200

300

350

0.02 0.1

-3dB BANDWIDTH

vs. INPUT AMPLITUDE

MAX4188toc21

INPUT AMPLITUDE (Vp-p)

-3dB BANDWIDTH (MHz)

MAX4188

MAX4189

DUAL SUPPLIES: R

L

= 1kΩ,

A

V

= +2V/V, RF = RG = 910Ω FOR MAX4188; A

V

= +1V/V, RF = 1.6kΩ FOR MAX4189

-10

-100

0.1 1000100101

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

-70

-90

-30

-50

0

-60

-80

-20

-40

MAX4188toc22

FREQUENCY (MHz)

PSRR (dB)

VCC (MAX4188)

VCC (MAX4189)

VEE (MAX4189)

VEE (MAX4188)

0

0.4

0.2

1.0

0.8

0.6

1.2

1.4

1.8

1.6

2.0

-40 -20 0 20 40 60 80

INPUT OFFSET VOLTAGE (VOS)

vs. TEMPERATURE

MAX4188toc25

TEMPERATURE (°C)

V

OS

(mV)

1k

0.1

0.1 1 10 100 1000

OUTPUT IMPEDANCE

vs. FREQUENCY (DUAL SUPPLIES)

1

MAX4188-23

FREQUENCY (MHz)

OUTPUT IMPEDANCE (Ω)

10

100

MAX4188

MAX4189

RL = 1kΩ, A

V

= +2V/V, RF = RG = 910Ω FOR MAX4188; A

V

= +1 V/V, RF = 1.6kΩ FOR MAX4189

1.2

1.3

1.4

1.5

1.6

-40 20-20 0 40 60 80

SUPPLY CURRENT PER AMPLIFIER

vs. TEMPERATURE

MAX4188toc24

TEMPERATURE (°C)

SUPPLY CURRENT PER AMPLIFIER (mA)

VCC = 5V; V

EE

= 0

VCC = 5V; V

EE

= -5V

0

1

2

3

4

5

-40 20-20 0 40 60 80

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX4188toc26

TEMPERATURE (°C)

INPUT BIAS CURRENT (µA)

IB - (POSITIVE INPUT)

IB - (NEGATIVE INPUT)

0.2

0.3

0.4

0.5

-40 20-20 0 40 60 80

DISABLED SUPPLY CURRENT PER

AMPLIFIER vs. TEMPERATURE

MAX4188toc27

TEMPERATURE (°C)

DISABLED SUPPLY CURRENT PER AMPLIFIER (mA)

VCC = ±2.5V

VCC = ±5V

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

______________________________________________________________________________________

13

0.8

1.0

1.2

1.4

1.6

1.8

-40 20-20 0 40 60 80

OUTPUT VOLTAGE SWING

vs. TEMPERATURE

MAX4188toc28

TEMPERATURE (°C)

(V

CC

-V

OH

) AND (V

OL

-V

EE

) (mV)

VOL - VEE; RL = 150Ω

VCC - VOH; RL = 150Ω

VOL - VEE; RL = 1kΩ

VCC - VOH; RL = 1kΩ

0V

OUT

DISABLE

2V

0V

4V

MAX4188

ENABLE/DISABLE RESPONSE

MAX4188toc29

50ns/div

AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ, VIN = 1V

0V

2V/div

A

V

= +1V/V, RL = 1kΩ, RF = 1.6kΩ, VEE = 0

V

CC

V

OUT

0V

10V

MAX4189

POWER-ON RESPONSE

MAX4188toc30

200ns/div

-50mV

OUT

IN

+50mV

-25mV

+25mV

MAX4188

SMALL-SIGNAL PULSE RESPONSE

MAX4188toc31

10ns/div

AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ

-50mV

OUT

IN

+50mV

-25mV

+25mV

MAX4188

SMALL-SIGNAL PULSE RESPONSE

(WITH C

LOAD

)

MAX4188toc32

10ns/div

AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ, CL = 47pF

-2V

OUT

IN

+2V

-1V

+1V

MAX4188

LARGE-SIGNAL PULSE RESPONSE

MAX4188toc33

10ns/div

AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ

____________________________________Typical Operating Characteristics (continued)

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

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

14 ______________________________________________________________________________________

____________________________________Typical Operating Characteristics (continued)

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

20mV/div

0V

DISABLE

OUT

0V

3V

MAX4188

SWITCHING TRANSIENT

MAX4188toc37

100ns/div

AV = +2V/V, RF = 910Ω, RL = 1kΩ, VIN = 0

100mV/div

DISABLE

OUT

0V

3V

MAX4189

SWITCHING TRANSIENT

MAX4188toc38

100ns/div

AV = +1V/V, RF = 1.6kΩ, RL = 1kΩ, VIN = 0

-95 1 100010010

OFF-CHANNEL FEEDTHROUGH

vs. FREQUENCY (DUAL SUPPLIES)

-75

-35

-55

-25

-65

-85

-45

MAX4188toc39

FREQUENCY (MHz)

OFF-CHANNEL FEEDTHROUGH (dB)

RL = 150Ω

-50mV

OUT

IN

+50mV

-50mV

+50mV

MAX4189

SMALL-SIGNAL PULSE RESPONSE

MAX4188toc34

10ns/div

AV = +1V/V, RF = 1.1kΩ, RL = 150Ω

-50mV

OUT

IN

+50mV

-50mV

+50mV

MAX4189

SMALL-SIGNAL PULSE RESPONSE

(WITH C

LOAD

)

MAX4188toc35

10ns/div

AV = +1V/V, RF = 1.6kΩ, RL = 1kΩ, CL = 47pF

-2V

OUT

IN

+2V

-2V

+2V

MAX4189

LARGE-SIGNAL PULSE RESPONSE

MAX4188toc36

10ns/div

AV = +1V/V, RF = 1.1kΩ, RL = 150Ω

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

______________________________________________________________________________________ 15

Pin Descriptions

8

6

3

2

Disable Control Input. Amplifier is enabled when DISABLE ≥ (VCC- 2V) and disabled when DISABLE ≤ (V

CC

- 3V).

—

Amplifier Output

4

—

Amplifier Noninverting Input

—

MAX4190

—

DISABLE

OUT

IN+

IN-

OUT2

Amplifier Inverting Input

1, 5

—

Amplifier 2 Output

IN2-

14

—

IN2+

V

EE

Amplifier 2 Inverting Input

IN3+

13

Amplifier 2 Noninverting Input

—

12

IN3-

—

OUT3

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

N.C.

OUT1

IN1-

7

11

Amplifier 3 Noninverting Input

IN1+

10

—

V

CC

Amplifier 3 Inverting Input

DISABLE3

9

Amplifier 3 Output

NAME

—

DISABLE2

8

—

DISABLE1

—

No Connect. Not internally connected.

16

—

Amplifier 1 Output

15

7

14

13

Amplifier 1 Inverting Input

12

6

Amplifier 1 Noninverting Input

11

5

MAX4188/MAX4189

10

8, 9

7

Positive Power Supply. Connect VCCto +5V.

6

4

Disable Control Input for Amplifier 3. Amplifier 3 is enabled when DISABLE3 ≥ (V

CC

- 2V) and disabled when DISABLE3 ≤ (VCC- 3V).

5

3

4

3

Disable Control Input for Amplifier 2. Amplifier 2 is enabled when DISABLE2 ≥ (V

CC

- 2V) and disabled when DISABLE2 ≤ (VCC- 3V).

2

Disable Control Input for Amplifier 1. Amplifier 1 is enabled when DISABLE1 ≥ (V

CC

- 2V) and disabled when DISABLE1 ≤ (VCC- 3V).

2

1

FUNCTION

1

SO/µMAXSO QSOP

Detailed Description

The MAX4188/MAX4189/MAX4190 are very low-power, current-feedback amplifiers featuring bandwidths up to 250MHz, 0.1dB gain flatness to 80MHz, and low differential gain (0.03%) and phase (0.05°) errors. These amplifiers achieve very high bandwidth-to-power ratios while maintaining low distortion, wide signal swing, and excellent load-driving capabilities. They are optimized for ±5V supplies but are also fully specified for single +5V operation. Consuming only 1.5mA per amplifier, these devices have ±55mA output current drive capability and achieve low distortion even while driving 150Ω loads.

Wide bandwidth, low power, low differential phase/gain error, and excellent gain flatness make the MAX4188 family ideal for use in portable video equipment such as video cameras, video switchers, and other batterypowered equipment. Their two-stage design provides higher gain and lower distortion than conventional single-stage, current-feedback amplifiers. This feature, combined with a fast settling time, makes these devices suitable for buffering high-speed analog-to-digital converters.

The MAX4188/MAX4189/MAX4190 have a high-speed, low-power disable mode that is activated by driving the amplifiers’ DISABLE input low. In the disable mode, the

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

16 ______________________________________________________________________________________

amplifiers achieve very high isolation from input to output (65dB at 10MHz), and the outputs are placed into a highimpedance state. These amplifiers achieve low switching-transient glitches (<45mVp-p) when switching between enable and disable modes. Fast enable/disable times (120ns/35ns), along with high off-isolation and low switching transients, allow these devices to be used as high-performance, high-speed multiplexers. This is achieved by connecting the outputs of multiple amplifiers together and controlling the DISABLE inputs to enable one amplifier and disable all others. The disabled amplifiers present a very light load (1µA leakage current and

3.5pF capacitance) to the active amplifier’s output. The feedback network impedance of all the disabled amplifiers must still be considered when calculating the total load on the active amplifier output. Figure 1 shows an application circuit using the MAX4188 as a 3:1 video multiplexer.

The DISABLE_ logic threshold is typically VCC- 2.5V, independent of VEE. For a single +5V supply or dual ±5V supplies, the disable inputs are CMOS-logic compatible. The amplifiers default to the enabled mode if the DISABLE pin is left unconnected. If the DISABLE pin is left floating, take proper care to ensure that no high-frequency signals are coupled to this pin, as this may cause false triggering.

Applications Information

Theory of Operation

The MAX4188/MAX4189/MAX4190 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 2, 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≅

300Ω. 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:

V

OUT

IN

( / )= = +G R R

F G

1

V

IN

R

G

R

IN

T

Z

R

F

+1

V

OUT

MAX4188 MAX4189 MAX4190

Figure 2. Current-Feedback Amplifier

AMP1

6

7

5

560Ω

75Ω

V

IN

1

560Ω

1.0µF

1.0µF 0.1µF

4

11

+5V -5V

0.1µF

87Ω

AMP2

13

14

12

9

10

DISABLE2 DISABLE3

DISABLE1

560Ω

75Ω

V

IN

2

560Ω

V

OUT

87Ω

75Ω

CABLE

8

1 2 3

560Ω

75Ω

V

IN

3

560Ω

87Ω

MAX4188

AMP3

Figure 1. High-Speed 3:1 Video Multiplexer

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

______________________________________________________________________________________ 17

V

OUT

R

G

R

S

V

OUT

= -(RF / RG) (VIN)

V

IN

R

F

R

O

R

T

MAX4188 MAX4189 MAX4190

Figure 3a. Inverting Gain Configuration

V

OUT

R

G

R

S

V

OUT

= [1+ (RF / RG)] V

IN

V

IN

R

F

R

O

R

T

MAX4188 MAX4189 MAX4190

Figure 3b. Noninverting Gain Configuration

Layout and Power-Supply Bypassing

As with all wideband amplifiers, a carefully laid out printed circuit board and adequate power-supply bypassing are essential to realizing the optimum AC performance of MAX4188/MAX4189/MAX4190. The PC board should have at least two layers. Signal and power should be on one layer. A large low-impedance ground plane, as free of voids as possible, should be the other layer. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces.

Do not use wire-wrap boards or breadboards and sockets. Wire-wrap boards are too inductive. Breadboards and sockets are too capacitive. Surfacemount components have lower parasitic inductance and capacitance, and are therefore preferable to through-hole components. Keep lines as short as possible to minimize parasitic inductance, and avoid 90° turns. Round all corners. Terminate all unused amplifier inputs to ground with a 100Ω or 150Ω resistor.

The MAX4188/MAX4189/MAX4190 achieve a high degree of off-isolation (65dB at 10MHz) and low crosstalk (-55dB at 10MHz). The input and output signal traces must be kept from overlapping to achieve high off-isolation. Coupling between the signal traces of different channels will degrade crosstalk. The signal traces of each channel should be kept from overlapping with the signal traces of the other channels.

Adequate bypass capacitance at each supply is very important to optimize the high-frequency performance of these amplifiers. Inadequate bypassing will also degrade crosstalk rejection, especially with heavier loads. Use a 1µF capacitor in parallel with a 0.01µF to

0.1µF capacitor between each supply pin and ground to achieve optimum performance. The bypass capacitors should be located as close to the device as possible. A 10µF low-ESR tantalum capacitor may be required to produce the best settling time and lowest distortion when large transient currents must be delivered to a load.

Choosing Feedback and Gain Resistors

The optimum value of the external-feedback (RF) and gain-setting (RG) resistors used with the MAX4188/ MAX4189/MAX4190 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 3a and 3b show the standard inverting and noninverting configurations. Note that the noninverting circuit gain (Figure 3b) is 1 plus the magnitude of the inverting closed-loop gain. Otherwise, the two circuits are identical.

COMPONENT/

BW

COMPONENT/

BW

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

18 ______________________________________________________________________________________

MAX4188/MAX4189/MAX4190

DC and Noise Errors

Several major error sources must be considered in any op amp. These apply equally to the MAX4188/ MAX4189/MAX4190. 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 4, the total output offset voltage is determined by the following factors:

• The input offset voltage (V

OS

) times the closed-loop

gain (1 = R

F

/ RG).

• The positive input bias current (I

B+

) times the

source resistor (R

S

) (usually 50Ω or 75Ω), plus the

negative input bias current (I

B-

) times the parallel

combination of R

G

and RF. In current-feedback amplifiers, the input bias currents at the IN+ and INterminals 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:

V I R I R R V 1

R R

OUT B S B F G OS

F

G

|| =

( )

+

( )

+

[ ]

+

 



 



+ −

Table 1a. MAX4188 Recommended Component Values

Table 1b. MAX4189 Recommended Component Values

Table 1c. MAX4190 Recommended Component Values

AV= +10

V/V

470

51 30

RL=

1kΩ

AV= +5

V/V

470 120

70

RL=

1kΩ

AV= +2V/V

AV = +10

(V/V)

DUAL SUPPLIES

620 430

AV= +2V/V

430 130

RL=

100Ω

620 145

RL=

150Ω

470 120

70

470

AV = +5

(V/V)

1.1k

1.1k 185

RL=

1kΩ

RL=

1kΩ

51 30

RL=

1kΩ

390 390 145

RL=

100Ω

910RF(Ω) 910 200

560

COMPONENT/

BW

RG(Ω)

-3dB BW (MHz)

RL= 1kΩ

560 160

RL=

150Ω

AV= +10

V/V

470

51 30

RL=

1kΩ

AV= +5

V/V

470 120

70

RL=

1kΩ

AV= +2V/V

AV = +10

(V/V)

DUAL SUPPLIES

750 510

AV= +1V/V

510 125

RL=

100Ω

750 135

RL=

150Ω

470 120

70

470

AV = +5

(V/V)

1.5k

1.5k 165

RL=

1kΩ

RL=

1kΩ

51 30

RL=

1kΩ

510 510 135

RL=

100Ω

1.3kRF(Ω)

1.3k 185

680

COMPONENT/

BW

RG(Ω)

-3dB BW (MHz)

RL= 1kΩ

680 180

RL=

150Ω

SINGLE SUPPLY

R

G

IBI

B

+

V

OUT

R

F

R

S

MAX4188 MAX4189 MAX4190

Figure 4. Output Offset Voltage

RL= 150Ω

210

1.1k

RL= 1kΩ RL= 100Ω

185

680

AV= +1V/V

-3dB BW (MHz)

RG(Ω)

RL= 1kΩ

230

1.5k

DUAL SUPPLIES

RL= 150Ω

190

1.6k

RL= 100Ω

165

910

SINGLE SUPPLY

AV= +1V/V

COMPONENT/

BW

250

1.6k

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, Current-

Feedback Amplifiers with High-Speed Disable

______________________________________________________________________________________ 19

VIDEO IN

VIDEO

OUT

75Ω

75Ω CABLE

R

F

560Ω

R

G

560Ω

75Ω

+5V

-5V

0.1µF

MAX4188

0.1µF

Figure 5. Video Line Driver Application

R

G

R

F

R

S

R

L

C

L

V

IN

MAX4188 MAX4189 MAX4190

Figure 6a. Using an Isolation Resistor (RS) for High Capacitive Loads

The total output-referred noise voltage is:

The MAX4188/MAX4189/MAX4190 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 MAX4188 typical data and typical operating circuit where RF= RG= 560kΩ (RF || RG=280Ω), 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 68µV

RMS

(approximately 408µVp-p, choosing the six-

sigma value).

Video Line Driver

The MAX4188/MAX4189/MAX4190 are well suited to drive coaxial transmission lines when the cable is terminated at both ends (Figure 5). Cable frequency response can cause variations in the signal’s flatness. See Table 1 for optimum RFand RGvalues.

Driving Capacitive Loads

The MAX4188/MAX4189/MAX4190 are optimized for AC performance. Reactive loads decrease phase margin and may produce excessive ringing and oscillation. Unlike most high-speed amplifiers, the MAX4188/ MAX4189/MAX4190 are tolerant of capacitive loads up to 50pF. Capacitive loads greater than 50pF may cause ringing and oscillation. Figure 6a shows a circuit that eliminates this problem. Placing the small (usually 15Ω to 33Ω) 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 6b and 6c show the MAX4188 and MAX4189 frequency response with a 100pF capacitive 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.

e

x x

x x x

e Hz

n OUT

( )

.

. /

= +

( )

 

 

+

 

 

+

 

 

=

−

− −

1 1

4 10 37 5

5 10 280 2 10

4 8

12

2

12

2

9

2

nV

V

x x x

x

V

OUT

=

 

 

+

 

 

+





  





  

+

( )

=

− −

−

1 10 37 5 2 10 280

1 5 10

1 1

4 1

6 6

3

.

. mV

e

R

x

i R i R R e

n OUT

F

G

n S n F G n

( )

||

= +

 



 



( )

[ ]

+

( )

[ ]

+

( )

+ −

1

2 2

2

MAX4188/MAX4189/MAX4190

Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable

20 ______________________________________________________________________________________

Ordering Information (continued)

Pin Configurations

MAX4188/4189 TRANSISTOR COUNT: 336

MAX4190 TRANSISTOR COUNT: 112

SUBSTRATE CONNECTED TO V

EE

Chip Information

1 2 3 4

8 7 6 5

DISABLE V

CC

OUT N.C.V

EE

IN+

IN-

N.C.

MAX4190

SO/µMAX

14 13 12 11 10

9 8

1 2 3 4 5 6 7

OUT2 IN2IN2+ V

EE

V

CC

DISABLE3

DISABLE2

DISABLE1

TOP VIEW

MAX4188 MAX4189

IN3+ IN3OUT3OUT1

IN1-

IN1+

SO

16 15 14 13 12 11 10

9

1 2 3 4 5 6 7 8

DISABLE1 OUT2

IN2IN2+ V

EE

IN3+ IN3OUT3 N.C.

MAX4188 MAX4189

QSOP

DISABLE2 DISABLE3

IN1-

V

CC

IN1+

OUT1

N.C.

5 4 3

-5 1 10 100 1000

-2

-3

-4

2 1 0

-1

FREQUENCY (MHz)

GAIN (dB)

MAX4189 A

V

= +1V/V

R

F

= 1.6k

R

L

= 1k || 100pF

V

IN

= 20mVp-p

RS = 0Ω

RS = 20Ω

RS = 33Ω

Figure 6c. Normalized Frequency Response with 100pF Capacitive Load

Figure 6b. Normalized Frequency Response with 100pF Capacitive Load

12

10

8

-10 1 10 100 1000

-2

-4

-8

6 4 2 0

FREQUENCY (MHz)

GAIN (dB)

MAX4188/MAX4190 A

V

= +2V/V

R

F

= RG = 910Ω

R

L

= 1k || 100pF

V

IN

= 20mVp-p

RS = 0Ω

RS = 20Ω

RS = 33Ω

PART TEMP. RANGE PIN-PACKAGE

MAX4189ESD

-40°C to +85°C 14 SO MAX4189EEE -40°C to +85°C 16 QSOP MAX4190ESD

-40°C to +85°C 8 SO

MAX4190EEE -40°C to +85°C 8 µMAX

Datasheet MAX4189EEE, MAX4188ESD, MAX4188EEE, MAX4190ESD, MAX4190EEE Datasheet (Maxim)

Specifications and Main Features

Frequently Asked Questions

User Manual