Datasheet MAX4120ESD, MAX4120EEE, MAX4119ESD, MAX4119EEE, MAX4118ESA Datasheet (Maxim)

_______________General Description

The single MAX4112/MAX4113, dual MAX4117/
MAX4118, and quad MAX4119/MAX4120 current feed­back amplifiers combine high-speed performance with
low-power operation. The MAX4112/MAX4117/
MAX4119 are optimized for closed-loop gains of 2V/V
or greater, while the MAX4113/MAX4118/MAX4120 are
optimized for gains of 8V/V or greater.

The MAX4112/MAX4117/MAX4119 and the MAX4113/
MAX4118/MAX4120 require only 5mA of supply current
per channel, and deliver 0.1dB gain flatness up to 115MHz
and -3db bandwidths of 400MHz (AV≥ 2V/V) and 300MHz
(AV≥ 8V/V), respectively. Their high slew rates of up t o
1800V/µs provide exceptional full-power bandwidths up
to 280MHz, making these amplifiers ideal for high-per­formance pulse and RGB video applications.

These high-speed op amps have a wide output voltage
swing of ±3.5V into 100Ω and a high current-drive
capability of 80mA.

________________________Applications

Broadcast and High-Definition TV Systems
RGB Video
Pulse/RF Amplifier
Ultrasound/Medical Imaging
Active Filters
High-Speed ADC Buffers
Professional Cameras
High-Definition Surveillance

____________________________Features

♦ 400MHz -3dB Bandwidth (MAX4112/MAX4117)

270MHz -3dB Bandwidth (MAX4113/MAX4119)
300MHz -3dB Bandwidth (MAX4118/MAX4120)

♦ 0.1dB Gain Flatness to 115MHz
♦ 1200V/µs Slew Rate

(MAX4112/MAX4117/MAX4119)
1800V/µs Slew Rate
(MAX4113/MAX4118/MAX4120)

♦ 280MHz Full-Power Bandwidth

(VO= 2Vp-p, MAX4112/MAX4117)
240MHz Full-Power Bandwidth
(VO= 2Vp-p, MAX4113/MAX4118/MAX4120)

♦ High Output Drive: 80mA
♦ Low Power: 5mA Supply Current per Channel

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

________________________________________________________________

Maxim Integrated Products

1

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

19-0440; Rev 2; 4/97

PART

MAX4112ESA

MAX4112EUA -40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO
8 µMAX*

______________Ordering Information

Ordering Information continued at end of data sheet.

*

Contact factory for µMAX package availability.

OUT

IN+

N.C.

V

EE

1

2

8

7

N.C.
V

CC

IN-

N.C.

MAX4112
MAX4113

SO/µMAX

TOP VIEW

3

4

6

5

INB-

INA+

INB+

V

EE

1

2

8

7

V

CC

OUTB

INA-

OUTA

MAX4117
MAX4118

SO

3

4

6

5

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUTD
IND­IND+
V

EE

V

CC

INA+

INA-

OUTA

INC+
INC­OUTCOUTB

INB-

INB+

SO

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

OUTA OUTD

IND­IND+
V

EE

INC+
INC­OUTC
N.C.

QSOP

INA-

INA+

INB-

V

CC

INB+

OUTB

N.C.

MAX4119
MAX4120

MAX4119
MAX4120

__________________________________________________________Pin Configurations

EVALUATION KIT

AVAILABLE

MAX4113ESA

-40°C to +85°C 8 SO

MAX4117ESA

-40°C to +85°C 8 SO

MAX4118ESA

-40°C to +85°C 8 SO

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

Power-Supply Voltage (VCCto VEE).......................................12V

Input Voltage (IN_+, IN_-)...................(V

CC

+ 0.3V) to (VEE- 0.3V)

IN_ _ Current (Note 1)......................................................±10mA

Short-Circuit Duration (V

OUT

to GND)

V

IN

< 1.5V ...............................................................Continuous

V

IN

> 1.5V..........................................................................0sec

Continuous Power Dissipation (T

A

= +70°C)

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

8-Pin µMAX (derate 4.10mW/°C above +70°C)............330mW

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

16-Pin QSOP (derate 9.52mW/°C above +70°C)..........762mW

Operating Temperature Range

MAX41_ _E_ _...................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +160°C

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

IN+ kΩ500

V

OUT

= 0V

MAX4112/MAX4117/
MAX4119

V

OUT

= 0V

RL= 30Ω, TA= 0°C to +85°C

IN-

VIN= 0V

f = 10kHz

f = 10kHz

V

OUT

= ±2.0V, VCM= 0V, RL= 100Ω

VS= ±4.5V to ±5.5V

f = 1MHz to 100MHz

f = 10kHz

V

OUT

= 0V, VIN= -V

OS

V

OUT

= 0V, VIN= -V

OS

VCM= ±2.5V

CONDITIONS

Ω30

9

Input Resistance

i

n+

Positive Input Current Noise

MAX4113/MAX4118/
MAX4120

mA65 80I

OUT

Output Current Drive

RL= 100Ω

RL= ∞

mA5 6.5I

SY

Quiescent Supply Current
per Amplifier

kΩZ

OL

Open-Loop Transimpedance 250 500

V

dB

dB45 50CMRCommon-Mode Rejection

V-2.5 2.5V

CM

Common-Mode Input Voltage

µV/°C10TCV

OS

Input Offset Voltage Drift

mV1 8V

OS

Input Offset Voltage

pA/√Hz

14i

n-

Negative Input Current Noise

pA/√Hz

13

µV

RMS

27E

nRMS

Integrated Voltage Noise

nV/√Hz

2.2e

n

Input Voltage Noise

µA3.5 20I

B+

Positive Input Bias Current

µA3.5 20I

B-

Negative Input Bias Current

UNITSMIN TYP MAXSYMBOLPARAMETER

60 80PSRPower-Supply Rejection

±3.1 ±3.5

V

OUT

Output Voltage Swing

±3.5 ±3.8

V

OUT

≤ 0.1V

RMS

MHz

400

BW

SS

Small Signal -3dB Bandwidth

300

270

MAX4112/MAX4117
MAX4113/MAX4119
MAX4118/MAX4120

DC SPECIFICATIONS (RL= ∞, unless otherwise noted)

AC SPECIFICATIONS (RL= 100Ω, unless otherwise noted)

ELECTRICAL CHARACTERISTICS (continued)

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

MIN

to T

MAX

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

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

_______________________________________________________________________________________ 3

Note 1: The MAX4112/MAX4113/MAX4117–MAX4120 are designed to operate in a closed-loop configuration in which the IN- pin is

driven by the OUT pin through an external feedback network. If an external voltage source is connected to IN-, current into
or out of IN- must be limited to ±10mA, to prevent damage to the part.

to 0.01%,

-1V ≤ V

OUT

≤ 1V

to 0.1%,

-1V ≤ V

OUT

≤ 1V

V

OUT

= 2Vp-p

-2V ≤ V

OUT

≤ 2V

MAX4112/MAX4117/MAX4119, A

VCL

= +2

MAX4113/MAX4118/MAX4120, A

VCL

= +8

3

ns

25

t

S

Settling Time

35

10

15

V/µs

1800

SRSlew Rate

1200

MHzBW

LS

Large-Signal -3dB Bandwidth

240

280

100

MHz

115

BW

0.1dB

0.1dB Gain Flatness

UNITSMIN TYP MAXSYMBOLPARAMETER

fC= 5MHz,
V

OUT

= 2Vp-p

f = 3.58MHz,
RL= 150Ω

f = 3.58MHz,
RL= 150Ω

dB-75Crosstalk

dB36IP3Two-Tone Third-Order Intercept

dBc

-62

SFDRSpurious-Free Dynamic Range

-68

Ω0.9Z

OUT

Output Impedance

pF2C

IN

Input Capacitance

degrees

0.04

DPDifferential Phase

0.03

%

0.02

DGDifferential Gain

0.02

ns

0.8

tR, t

F

Rise/Fall Times

10% to 90%, -2V ≤ V

OUT

≤ 2V

MAX4113/MAX4118/
MAX4120

MAX4112/MAX4117/
MAX4119

MAX4113/MAX4118/
MAX4120

MAX4112/MAX4117/
MAX4119

MAX4113/MAX4118/
MAX4120

MAX4113/MAX4118/
MAX4120

MAX4112/MAX4117

MAX4112/MAX4117/
MAX4119

CONDITIONS

All hostile, VIN= 1Vp-p, f = 10MHz

MAX4112/MAX4117/MAX4119, fC= 10MHz,
fC1= 10.1MHz, A

VCL

= +2

MAX4113/MAX4118/
MAX4120, A

VCL

= +8

MAX4112/MAX4117/
MAX4119, A

VCL

= +2

f = 10MHz, A

VCL

= +2

MAX4113/MAX4118/
MAX4120, A

VCL

= +8

MAX4113/MAX4118/
MAX4120, A

VCL

= +8

MAX4112/MAX4117/
MAX4119, A

VCL

= +2

MAX4112/MAX4117/
MAX4119, A

VCL

= +2

10% to 90%, -50mV ≤ V

OUT

≤ 50mV

MAX4119 145

AC SPECIFICATIONS (RL= 100Ω, unless otherwise noted) (continued)

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= -5V, RF= 499Ω, RL= 100Ω, TA = +25°C, unless otherwise noted.)

0.1 101 100 1000

MAX4112/MAX4117/MAX4119

SMALL-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +2)

MAX4112/4113-01

FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

V

OUT

≤ 100mVp-p

RF = RG = 600Ω

MAX4112/MAX4117/MAX4119

LARGE-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +2)

MAX4112/4113-02

0.1 101 100 1000
FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

V

OUT

= 2Vp-p

RF = RG = 600Ω

MAX4113/MAX4118/MAX4120

SMALL-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +8)

MAX4112/4113-03

0.1 101 100 1000
FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

RF = 500Ω
R

G

= 68Ω

V

OUT

≤ 100mVp-p

MAX4113/MAX4118/MAX4120

SMALL-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +20)

MAX4112/4113-4a

0.1 101 100 1000
FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

RF = 330Ω
R

G

= 18Ω

V

OUT

≤ 100mVp-p

IN

OUT

GND

GND

MAX4112/MAX4117/MAX4119

SMALL-SIGNAL PULSE RESPONSE

(A

VCL

= +10)

MAX4112-07

TIME (10ns/div)

VOLTAGE (20mV/div)

IN

OUT GND

GND

MAX4112/MAX4117/MAX4119

SMALL-SIGNAL PULSE RESPONSE

(A

VCL

= +2)

MAX4112-05

TIME (10ns/div)

VOLTAGE (25mV/div)

MAX4113/MAX4118/MAX4120

SMALL-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +50)

MAX4112/4113-4b

0.1 101 100 1000
FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

RF = 330Ω
R

G

= 6.8Ω

V

OUT

≤ 100mVp-p

IN

OUT

GND

GND

MAX4112/MAX4117/MAX4119

LARGE-SIGNAL PULSE RESPONSE

(A

VCL

= +2)

MAX4112-08

TIME (10ns/div)

VOLTAGE (1V/div)

MAX4112/MAX4117/MAX4119

SMALL-SIGNAL GAIN vs. FREQUENCY

(A

VCL

= +5, +10)

MAX4112-insert A

0.1 101 100 1000
FREQUENCY (MHz)

NORMALIZED GAIN (dB)

-6

-5

-3

-4

-1

-2

0

1

2

4
3

V

OUT

≤ 100mVp-p

AV = +5V/V
R

F

= 499Ω

R

G

= 124Ω

AV = +10V/V
R

F

= 499Ω

R

G

= 54.9Ω

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

_______________________________________________________________________________________

5

IN

OUT

GND

GND

MAX4112/MAX4117/MAX4119

LARGE-SIGNAL PULSE RESPONSE

(A

VCL

= +10)

MAX4112-10

TIME (10ns/div)

VOLTAGE (1V/div)

IN

OUT

GND

GND

MAX4112/MAX4117/MAX4119

SMALL-SIGNAL PULSE RESPONSE

(A

VCL

= +2, CL = 10pF)

MAX4112-12

TIME (10ns/div)

VOLTAGE (50mV/div)

IN

OUT

GND

GND

MAX4113/MAX4118/MAX4120

SMALL-SIGNAL PULSE RESPONSE

(A

VCL

= +8)

MAX4112-13

TIME (10ns/div)

VOLTAGE (20mV/div)

IN

OUT

GND

GND

MAX4113/MAX4118/MAX4120

LARGE-SIGNAL PULSE RESPONSE

(A

VCL

= +20)

MAX4112-16

TIME (10ns/div)

VOLTAGE (1V/div)

IN

OUT

GND

GND

MAX4113/MAX4118/MAX4120

SMALL-SIGNAL PULSE RESPONSE

(A

VCL

= +20)

MAX4112-14

TIME (10ns/div)

VOLTAGE (20mV/div)

IN

OUT

GND

GND

MAX4113/MAX4118/MAX4120

LARGE-SIGNAL PULSE RESPONSE

(A

VCL

= +8)

MAX4112-15

TIME (10ns/div)

VOLTAGE (1V/div)

30

20

10

0

2 4 6 8 10

MAX4112/MAX4117/MAX4119

SETTLING TIME vs. GAIN

MAX4112/4113 -17a

GAIN (V/V)

SETTLING TIME (ns)

-120

-110

-90

-100

-70

-80

-60

-50

-40

-20

-30

0.1 101 100

MAX4117–MAX4120

CROSSTALK vs. FREQUENCY

MAX4112/4113-18a

FREQUENCY (MHz)

AMPLITUDE (dB)

40

35

30

25

20

15

10

8 16 24 32 40 48 56

MAX4113/MAX4118/MAX4120

SETTLING TIME vs. GAIN

MAX4112/4113 -17b

GAIN (V/V)

SETTLING TIME (ns)

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, RF= 499Ω, RL= 100Ω, TA = +25°C, unless otherwise noted.)

0

-100

-80

-20

MAX4112/4113-27

LOAD RESISTANCE (Ω)

HARMONIC DISTORTION (dBc)

-40

-60

-90

-70

-10

-30

-50

3rd

A

VCL

= +2

V

OUT

= 2Vp-p

2nd

MAX4112/MAX4117/MAX4119

5MHz HARMONIC DISTORTION

vs. LOAD RESISTANCE

0 600 1000400 800200

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

6 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, RF= 499Ω, RL= 100Ω, TA = +25°C, unless otherwise noted.)

1

10

100

100k10k1k100101 10M1M

INPUT VOLTAGE NOISE

vs. FREQUENCY

MAX4112/4113-19

FREQUENCY (Hz)

NOISE (nV/√Hz)

MAX4112/MAX4117/MAX4119

MAX4113/MAX4118/MAX4120

10

100

1000

100k10k1k100101 10M1M

MAX4112/MAX4117/MAX4119

INPUT CURRENT NOISE vs. FREQUENCY

MAX4112/4113-20

FREQUENCY (Hz)

NOISE (pA/√Hz)

IN+, IN-

1

10

1000

100

100k10k1k100101 10M1M

MAX4113/MAX4118/MAX4120

INPUT CURRENT NOISE vs. FREQUENCY

MAX4112/4113-21

FREQUENCY (Hz)

NOISE (pA/√Hz)

IN+

IN-

1000

100

10

1

0.1

0.1 101 100 500

CLOSED-LOOP OUTPUT IMPEDANCE

vs. FREQUENCY

MAX4112/4113-22

FREQUENCY (MHz)

OUTPUT IMPEDANCE (Ω)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

0.1 1 10 100

MAX4112/MAX4117/MAX4119

HARMONIC DISTORTION vs. FREQUENCY

MAX4112/4113-23

FREQUENCY (MHz)

HARMONIC DISTORTION (dBc)

2nd
(A

VCL

= +5)

V

OUT

= 2Vp-p

2nd
(A

VCL

= +2)

3rd
(A

VCL

= +2,

A

VCL

= +5)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

0.1 1 10 100

MAX4113/MAX4118/MAX4120

HARMONIC DISTORTION vs. FREQUENCY

MAX4112/4113-24

FREQUENCY (MHz)

HARMONIC DISTORTION (dBc)

3rd
(A

VCL

= +8)

3rd
(A

VCL

= +20)

2nd
(A

VCL

= +8)

2nd
(A

VCL

= +20)

V

OUT

= 2Vp-p

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

MAX4112/MAX4117/MAX4119

5MHz HARMONIC DISTORTION

vs. OUTPUT SWING

-80

-20

MAX4112/4113 -26

OUTPUT SWING (Vp-p)

HARMONIC DISTORTION (dBc)

-40

-60

-90

-70

-10

-30

-50

3rd

2nd

A

VCL

= +2

-5

15

35

55

75

95

105

0.1 101 100 1000

POWER-SUPPLY REJECTION

vs. FREQUENCY

MAX4112/4113-18b

FREQUENCY (MHz)

POWER-SUPPLY REJECTION (dB)

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

_______________________________________________________________________________________

7

0

-100

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

MAX4113/MAX4118/MAX4120

5MHz HARMONIC DISTORTION

vs. OUTPUT SWING

-80

-20

MAX4112/4113-28

OUTPUT VOLTAGE SWING (Vp-p)

HARMONIC DISTORTION (dBc)

-40

-60

-90

-70

-10

-30

-50

3rd

2nd

A

VCL

= +8

0

-100
0 600 1000

MAX4113/MAX4118/MAX4120

5MHz HARMONIC DISTORTION

vs. LOAD RESISTANCE

-80

-20

MAX4112/4113-29

LOAD RESISTANCE (Ω)

HARMONIC DISTORTION (dBc)

400 800200

-40

-60

-90

-70

-10

-30

-50

3rd

2nd

A

VCL

= +8

V

OUT

= 2Vp-p

0

5

10

15

20

25

30

35

40

0.1 1 10 100

TWO-TONE THIRD-ORDER INTERCEPT

vs. FREQUENCY

MAX4112/4113-30

FREQUENCY (MHz)

THIRD-ORDER INTERCEPT (dBm)

MAX4113/MAX4118/MAX4120

MAX4112/MAX4117/MAX4119

900
800
700

600

500

400

300

200

-75 -50 -25 0 25 50 75 100 125

OPEN-LOOP TRANSIMPEDANCE

vs. TEMPERATURE

MAX4112/4113-33

TEMPERATURE (°C)

TRANSIMPEDANCE (kΩ)

MAX4112/MAX4117/MAX4119

MAX4113/MAX4118/MAX4120

4.40

4.20

4.00

3.80

3.60

3.40

3.20

3.00

POSITIVE OUTPUT VOLTAGE SWING

vs. TEMPERATURE

MAX4112/4113-34a

TEMPERATURE (°C)

OUTPUT VOLTAGE SWING (V)

RL = ∞

RL = 100Ω

-75 -50 -25 0 25 50 75 100 125

0.005

0.000

-0.005

-0.010

-0.015

-0.020

-0.025

0

IRE

IRE

R

L

= 150Ω

R

L

= 150Ω

100

MAX4112/4113-31

GAIN (%)

0.00

0.01

0.02

0.03

0.04

-0.01
0 100

PHASE (degrees)

MAX4112/MAX4117/MAX4119

DIFFERENTIAL GAIN and PHASE

MAX4113/MAX4118/MAX4120

DIFFERENTIAL GAIN and PHASE

-0.005

0.000

0.005

0.010

0.015

0.020

0.025

0

IRE

IRE

100

MAX4112/4113-32

GAIN (%)

0.00

0.02

0.04

-0.06

-0.04

-0.02

0 100

PHASE (degrees)

RL = 150Ω

R

L

= 150Ω

-4.40

-4.20

-4.00

-3.80

-3.60

-3.40

-3.20

-3.00

NEGATIVE OUTPUT VOLTAGE SWING

vs. TEMPERATURE

MAX4112/4113-34b

TEMPERATURE (°C)

OUTPUT VOLTAGE SWING (V)

RL = 100Ω

RL = ∞

-75 -50 -25 0 25 50 75 100 125

-2.00

-2.50

-3.00

-3.50

-4.00

-4.50

-5.00

POSITIVE INPUT BIAS CURRENT

vs. TEMPERATURE

MAX4112/4113-35a

TEMPERATURE (°C)

INPUT BIAS CURRENT (µA)

-75 -50 -25 0 25 50 75 100 125

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, RF= 499Ω, RL= 100Ω, TA = +25°C, unless otherwise noted.)

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

8 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, RF= 499Ω, RL= 100Ω, TA = +25°C, unless otherwise noted.)

-1

0

1

2

3

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

MAX4112/4113 -37

TEMPERATURE (°C)

VOLTAGE (mV)

-75 -50 -25 0 25 50 75 100 125

-8.00

-6.00

-4.00

-2.00

0

2.00

4.00

6.00

8.00

POWER-SUPPLY CURRENT

vs. TEMPERATURE

(PER AMPLIFIER)

MAX4112/4113-38

TEMPERATURE (°C)

CURRENT (mA)

I

CC

I

EE

-75 -50 -25 0 25 50 75 100 125

0

1

2

3

4

5

6

7

8

NEGATIVE INPUT BIAS (IB-)

CURRENT vs. TEMPERATURE

MAX4112/4113-36

TEMPERATURE (°C)

INPUT BIAS CURRENT (µA)

-75 -50 -25 0 25 50 75 100 125

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

25 50 75 100 125 150

OUTPUT SWING

vs. LOAD RESISTANCE

MAX4112/4113-39

LOAD RESISTANCE (Ω)

OUTPUT SWING (Vp-p)

3.0

FUNCTION

_____________________________________________________________Pin Descriptions

_______________Detailed Description

The MAX4112/MAX4117/MAX4119 are optimized for
closed-loop gains (A

VCL

) of 2V/V or greater, while the
MAX4113/MAX4118/MAX4120 are optimized for
closed-loop gains of 8V/V or greater. These low-power,
high-speed, current feedback amplifiers operate from
±5V supplies. They are designed to drive video loads
with low distortion characteristics. The MAX4112/
MAX4117/MAX4119’s differential gain and phase are

0.02% and 0.03°, respectively; the MAX4113/
MAX4118/MAX4120 exhibit gain/phase error specifica­tions of 0.02% and 0.04°, respectively. These charac­teristics, plus a wide 0.1dB gain flatness, make the
MAX4112/MAX4113/MAX4117–MAX4120 ideal for use

in broadcast and graphics video systems. The combi­nation of ultra-high speed and low power makes these
parts suitable for use in general-purpose, high-speed
applications, such as medical imaging, industrial instru­mentation, and communications systems.

__________Applications Information

Theory of Operation

Since these devices are current-feedback amplifiers,
their open-loop transfer function is expressed as a
transimpedance, ∆V

OUT

/∆IIN, or ZOL. The frequency
behavior of the open-loop transimpedance is similar to
the open-loop gain of a voltage 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:

where G = A

VCL

= 1 + (RF/ RG), and RIN= 1 /gM≅ 30Ω.

V

V

G x

Z

Z G x R R

OUT

IN

OL S

OL S IN F

=

+ +

( )

( )

( )

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

_______________________________________________________________________________________ 9

V

IN

R

G

R

IN

Z

OL

R

F

+1

+1

V

OUT

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 1. Current Feedback Amplifier

PIN

NAME FUNCTION

MAX4112
MAX4113
SO/µMAX

MAX4117
MAX4118

SO

1, 5, 8 — N.C.

No Connection. Not internally
connected.

— 1 OUTA Amplifier A Output

2 — IN- Inverting Input

— 2 INA- Amplifier A Inverting Input

3 — IN+ Noninverting Input

— 3 INA+ Amplifier A Noninverting Input

4 4 V

EE

Negative Power Supply.
Connect to -5V.

— 5 INB+ Amplifier B Noninverting Input

6 — OUT Amplifier Output
— 6 INB- Amplifier B Inverting Input
— 7 OUTB Amplifier B Output

7 8 V

CC

Positive Power Supply.
Connect to +5V.

PIN

NAME FUNCTION

1 1 OUTA Amplifier A Output
2 2 INA- Amplifier A Inverting Input
3 3 INA+ Amplifier A Noninverting Input

4 4 V

CC

Positive Power Supply.

Connect to +5V.
5 5 INB+ Amplifier B Noninverting Input
6 6 INB- Amplifier B Inverting Input
7 7 OUTB Amplifier B Output

— 8, 9 N.C.

No Connection. 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 to -5V.

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

SO QSOP

MAX4119/MAX4120

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

10 ______________________________________________________________________________________

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

Layout and Power-Supply Bypassing

The MAX4112/MAX4113/MAX4117–MAX4120 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. Wire-wrapped boards are much too induc­tive, and breadboards are much too capacitive; neither
should be used. IC sockets increase parasitic capaci­tance and inductance, and should not be used. In gen­eral, surface-mount components give better high­frequency performance than through-hole components.
They have shorter leads and lower parasitic reac­tances. Keep lines as short and as straight as possible.
Do not make 90° turns; round all corners.

Observe high-frequency bypassing techniques to
maintain the amplifier’s accuracy. The bypass capaci­tors should include a 1000pF ceramic capacitor
between each supply pin and the ground plane, locat­ed as close to the package as possible. Next, place a

0.01µF to 0.1µF ceramic capacitor in parallel with each
1000pF capacitor, and as close to them as possible.
Then place a 10µF to 15µF low-ESR tantalum at the
point of entry (to the PC board) of the power-supply
pins. The power-supply trace should lead directly from
the tantalum capacitor to the V

CC

and VEEpins. To
minimize parasitic inductance, keep PC traces short
and use surface-mount components.

V

V

G 1 R / R

OUT

IN

F G

= = +

( )

V

OUT

R

G

V

OUT

= -(RF/RG) x V

IN

V

IN

R

F

R

O

R

S

R

T

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 2a. Inverting Gain Configuration

V

OUT

V

IN

R

G

V

OUT

= [1+ (RF/RG)] x V

IN

R

F

R

O

R

T

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 2b. Noninverting Gain Configuration

100

49.9
400

49.9

600

600

1000.1dB Gain Flatness (MHz)

49.9RT(Ω)
400-3dB Small-Signal Bandwidth (MHz)

A

VCL

= +2

100

49.9
270

49.9

500

500

49.9RO(Ω)

600RG(Ω)

115

600RF(Ω)

49.9
300

49.9

47

330

115

49.9
270

115

49.9
300

49.9

47

330

49.9

69

500

A

VCL

= +8

MAX4117 MAX4119MAX4112 MAX4118 MAX4120MAX4113

Table 1. Recommended Component Values

280280Large-Signal Bandwidth (MHz) 145 240240 240

COMPONENT

Choosing Feedback and Gain Resistors

The MAX4112/MAX4113/MAX4117–MAX4120 are cur­rent feedback amplifiers. Increasing feedback resistor
values will decrease peaking. Use the input resistor
(RG) to change the magnitude of the gain. Figure 2
shows the standard inverting and noninverting configu­rations. Notice that the gain of the noninverting circuit
(Figure 2b) is 1 plus the magnitude of the inverting
closed-loop gain (Table 1).

DC and Noise Errors

There are several major error sources to consider in
any operational amplifier. These apply equally to the
MAX4112/MAX4113/MAX4117–MAX4120. Offset-error
terms are given by the equation below. Voltage and
current-noise errors are root-square summed and
therefore computed separately. In Figure 3, the total
output offset voltage is determined by:

a) The input offset voltage (VOS) times the closed-loop

gain (1 + (RF/ RG)).

b)The positive input bias current (IB+) 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-mode feedback amplifiers,
the input bias currents may flow into or out of the
device. For this reason, there is no benefit to match­ing the resistance at both inputs.

The equation for total DC error is:

c) The total output-referred noise voltage is:

The MAX4112/MAX4117/MAX4119 have a very low,
2nV/√Hz noise voltage. The current noise at the positive
input (in+) is 13pA/√Hz, and the current noise at the
inverting input (in-) is 14pA/√Hz.

An example of the DC error calculations, using the
MAX4112 typical data and the typical operating circuit
where R

F

= RG= 600Ω (R

F

||

RG= 300Ω) and RS= 50Ω,

gives the following:
V

OUT

= (3.5 x 10-6x 50 + 3.5 x 10-6x 300 + 10-3) (1 + 1)

V

OUT

= 4.45mV

Calculating total output noise in a similar manner yields:

With a 200MHz system bandwidth, this calculates to
133µV

RMS

(approximately 797µVp-p, choosing the six-

sigma value).

Resistor Types

Surface-mount resistors are the best choice for high­frequency circuits. They are of similar material to metal­film resistors, but are deposited using a thick-film
process in a flat, linear manner that minimizes induc­tance. Their small size and lack of leads also minimizes
parasitic inductance and capacitance, yielding more
predictable performance.

Metal-film resistors with leads are manufactured using
a thin-film process where resistive material is deposited
in a spiral layer around a ceramic rod. Although the
materials used are noninductive, the spiral winding pre­sents a small inductance (about 5nH) that may have an
adverse effect on high-frequency circuits.

Carbon-composition resistors with leads are manufac­tured by pouring the resistor material into a mold. This
process yields relatively low-inductance resistors that
are very useful in high-frequency applications, although
they tend to cost more and have more thermal noise
than other types. The ability of carbon-composition
resistors to self-heal after a large current overload
makes them useful in high-power RF applications.

For general-purpose use, surface-mount metal-film
resistors seem to have the best overall performance for
low cost, low inductance, and low noise.

Video Line Driver

The MAX4112/MAX4113/MAX4117–MAX4120 are opti­mized (gain flatness) to drive coaxial transmission lines
when the cable is terminated at both ends, as shown in
Figure 4. Cable frequency response can cause varia­tions in the flatness of the signal.

e 1 1 13x10 x50 14x10 x300 2x10
e 9.4nV Hz

n(OUT)

12

2

12

2

9

2

n(OUT)

/

= +

( )

( )+( )+( )

=

− − −

e

R

R

i R i R R e

n OUT

F

G

n S n F G n( )

||= +











( )

[ ]

+

( )

[ ]

+

( )

+ −

1

2 2

2

V I R I R R V 1+

R

R

OUT B S B F G OS

F
G

||=

( )+( )

( )

+

[ ]











+ −

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

______________________________________________________________________________________ 11

R

G

IB­I

B

+

V

OUT

R

F

R

S

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 3. Output Offset Voltage

Driving Capacitive Loads

The MAX4112/MAX4113/MAX4117–MAX4120 are opti­mized for AC performance. They are not designed to
drive highly capacitive loads. Reactive loads decrease
phase margin and can produce excessive ringing and
oscillation. Figure 5a shows a circuit that eliminates this
problem. The small (usually 5Ω to 22Ω) isolation resis­tor, RS, placed before the reactive load prevents ring­ing and oscillation. At higher capacitive loads, AC
performance is controlled by the interaction of the load
capacitance and isolation resistor.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

12

__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 [phone]

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

MAX4112/MAX4113/MAX4117–MAX4120

Single/Dual/Quad, 400MHz, Low-Power,
Current Feedback Amplifiers

TRANSISTOR COUNT: 53 (MAX4112/MAX4113)

112 (MAX4117/MAX4118)
220 (MAX4119/MAX4120)

SUBSTRATE CONNECTED TO V

EE

VIDEO
IN

VIDEO

OUT

75Ω

75Ω CABLE

75Ω CABLE

75Ω

75Ω

R

G

R

F

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 4. Video Line Driver

R

G

R

F

R

S

R

L

C

L

V

IN

MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120

Figure 5a. Using an Isolation Resistor (RS) for High Capacitive
Loads

0.1 101 100 1000
FREQUENCY (MHz)

GAIN (dB)

CL = 10pF

CL = 15pF

CL = 5pF

12

10

8

6

4

2

0

Figure 5b. Frequency Response vs. Capacitive Load—
No Isolation Resistor

0.1

12

10

8

6

4

2

0

-2
101 100 1000

FREQUENCY (MHz)

GAIN (dB)

RS = 0Ω

CL = 10pF

RS = 4.7Ω

RS = 22Ω

RS = 10Ω

Figure 5c. Frequency Response vs. Isolation Resistance
(see Figure 5a for circuit)

_Ordering Information (continued)

PART

MAX4119ESD

MAX4119EEE

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

14 SO
16 QSOP*

MAX4120ESD

-40°C to +85°C 14 SO

MAX4120EEE

-40°C to +85°C 16 QSOP*

___________________Chip Information

*

Contact factory for QSOP package availability.