Maxim MAX4259ESD, MAX4259EEE, MAX4158ESA, MAX4159ESD, MAX4159EEE Datasheet

_______________General Description

The MAX4158/MAX4159/MAX4258/MAX4259 are wide­band, 2-channel, noninverting video amplifiers with input
multiplexing, capable of driving ±2.5V signals into 50Ω or
75Ω loads. These devices are current-mode feedback
amplifiers; gain is set by external feedback resistors. The
MAX4158/MAX4159 are optimized for unity gain (0dB)
with a -3dB bandwidth of 350MHz. The MAX4258/
MAX4259 are optimized for gains of two (6dB) or more
with a 250MHz -3dB bandwidth. These devices have low
(0.01%/0.01°) differential gain and phase errors, and oper­ate from ±5V supplies.

These devices are ideal for use in broadcast and graphics
video systems because of their low, 2pF input capaci­tance, channel-to-channel switching time of only 20ns,
and wide, 130MHz 0.1dB bandwidth. In addition, the com­bination of ultra-high speed and low power makes them
suitable for use in general-purpose high-speed applica­tions, such as medical imaging, industrial instrumentation,
and communications systems.

The MAX4159/MAX4259 have address latching and high­impedance output disabling, allowing them to be incorpo­rated into large switching arrays. They are available in
14-pin SO and 16-pin QSOP packages. The MAX4158/
MAX4258 have no address latching or output disabling,
but are available in space-saving 8-pin µMAX and SO
packages.

________________________Applications

Video-Signal Multiplexing
Video Crosspoint Switches
Pixel Switching
Coaxial Cable Drivers
Workstations
High-Definition TV (HDTV)
Broadcast Video
Multimedia Products
High-Speed Signal Processing

____________________________Features

♦ Excellent Video Specifications:

0.1dB Gain Flatness to 130MHz

0.01%/0.01° Differential Gain/Phase Error

♦ High Speed:

350MHz -3dB Bandwidth (MAX4158/4159)
250MHz -3dB Bandwidth (MAX4258/4259)
700V/µs Slew Rate (MAX4158/4159)
1000V/µs Slew Rate (MAX4258/4259)
20ns Settling Time to 0.1%

♦ Fast Switching:

20ns Channel-Switching Time
<70mV Switching Transient

♦ Low Power: 100mW
♦ Directly Drive 75Ω or 50Ω Cables
♦ High Output Current Drive: >70mA
♦ Address Latch and High-Z Output Disable

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

________________________________________________________________

Maxim Integrated Products

1

19-1164; Rev 1; 3/97

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

______________Ordering Information

_________________Pin Configurations

PART

MAX4158ESA

MAX4158EUA
MAX4159ESD
MAX4159EEE

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO
8 µMAX

-40°C to +85°C

-40°C to +85°C 14 SO
16 QSOP

MAX4258ESA
MAX4258EUA
MAX4259ESD
MAX4259EEE

-40°C to +85°C

-40°C to +85°C 8 SO
8 µMAX

-40°C to +85°C

-40°C to +85°C 14 SO
16 QSOP

MAX4158/MAX4258

A0

0
1

INPUT

MAX4158/MAX4258

IN0
IN1

V+

IN1

FB

V-

1

2

8

7

A0
OUT

GND

IN0

SO/µMAX

TOP VIEW

3

4

6

5

Pin Configurations continued at end of data sheet.

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(V+ = +5V, V- = -5V, VIN= 0V, V

OUT

= 0V, RL= ∞, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +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.

Note 1: Continuous power dissipation maximum rating must also be observed.

Positive Supply Voltage (V+ to GND) ...................................+6V

Negative Supply Voltage (V- to GND).....................................-6V

Amplifier Input Voltage (IN0 or IN1) .....(V- - 0.3V) to (V+ + 0.3V)

FB Current ........................................................................±20mA

Digital Input Voltage (A0,

EN, or LE)............-0.3V to (V+ + 0.3V)

Output Short Circuit to GND (Note 1).........................Continuous

Output Short-Circuit Current to V+, V- (Note 1)....................5sec

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 8.33mW/°C above +70°C)..........667mW

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

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

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

Inferred from the CMRR test

Inferred from the PSRR test

V

OUT

= -2.5V to 2.5V

MAX4159/MAX4259 only, EN = 5V,
V

OUT

= -3.0V to 3.0V (Note 2)

f = 0Hz

RL= 50Ω

RL= open circuit

VIN= -2.5V to 2.5V

TA= +25°C

TA= +25°C

VIN= -2.5V to 2.5V

V

OUT

= -2.5V to 2.5V, RL= 100Ω

CONDITIONS

mA70 100I

OUT

Output Current

±2.5 ±3.5

V

OUT

V

±3.0 ±4.0

Output Voltage Swing

dB50 60CMRRDC Common-Mode Rejection Ratio

MΩ1.5 3.0Z

T

Open-Loop Transimpedance

mV±1 ±6V

OS

Input Offset Voltage (Either Channel)

V±2.5 ±3.0V

IN

V±4.5 ±5.5V+, V-Operating Supply-Voltage Range

Input Voltage Range

MΩ1 10R

OUT(d)

Disabled Output Resistance

mΩ40R

OUT

Output Resistance

Ω50R

IN(FB)

FB Pin Input Resistance

MΩ1 20

R

IN

µV/°C2TCV

OS

Input Offset Voltage Temperature
Coefficient (Either Channel)

µA

±2 ±10

I

IN

Input Bias Current (Channel On)

µA

±2 ±12

I

FB

FB Pin Bias Current

kΩ100 550

Input Resistance

UNITSMIN TYP MAXSYMBOLPARAMETER

Channel on
Channel off

Open loop, V+ = +4.5V to +5.5V,
V- = -4.5V to -5.5V

dB60 78PSRRDC Power-Supply Rejection Ratio

Sinking or sourcing to ground mA120I

SC

Output Short-Circuit Current

MAX4158/MAX4258 10.9 13.0
EN = GND, MAX4159/MAX4259

10.9 13.0

EN = V+, MAX4159/MAX4259

mA

6.3 8.0

I+Positive Supply Current

MAX4158/MAX4258 9.9 12.0
EN = GND, MAX4159/MAX4259

9.9 12.0

EN = V+, MAX4159/MAX4259

mA

5.0 7.0

I-Negative Supply Current

TA= T

MIN

to T

MAX

TA= T

MIN

to T

MAX

±18

±20

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(V+ = +5V, V- = -5V, VIN= 0V, V

OUT

= 0V, RL= ∞, TA= T

MIN

to T

MAX

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

AC ELECTRICAL CHARACTERISTICS—MAX4158/MAX4159

(V+ = +5V, V- = -5V, VIN= 0V, V

OUT

= 0V, RL= 100Ω, TA= +25°C, unless otherwise noted.)

VIL= 0V
VIH= 5.5V, V+ = +5.5V

CONDITIONS

µA130 300I

IH

Logic-High Input Current

µA-2 -20I

IL

Logic-Low Input Current

V2.0V

IH

Logic-High Threshold

V0.8V

IL

Logic-Low Threshold

UNITSMIN TYP MAXSYMBOLPARAMETER

AV= 0dB, V

OUT

= 2Vp-p (Note 4)

AV= 0dB, VIN= 20mVp-p (Note 4)

AV= 0dB, VIN= 20mVp-p (Note 4)

V

OUT

= 2V step, AV= 0dB (Note 4)

AV= 0dB, V

OUT

= 2Vp-p (Note 4)

CONDITIONS

ns10t

S

Settling Time to 0.1%

V/µs700SRSlew Rate

MHz155FPBWFull-Power Bandwidth

MHz100BW(0.1)Bandwidth for ±0.1dB Gain Flatness

MHz350BW-3dB Bandwidth

UNITSMIN TYP MAXSYMBOLPARAMETER

AV= 0dB (Notes 4, 5) %0.01DGDifferential Gain Error

f = 30MHz, V

OUT

= 2Vp-p,

AV= 0dB (Note 4)

f = 30MHz, AV= 0dB (Note 4)

f = 30MHz, RS= 50Ω, AV= 0dB,
VIN= ±2Vp-p (Note 4)

AV= 0dB (Notes 4, 5)

f = 30MHz, AV= 0dB, EN = 5V,
V

IN

= ±2Vp-p (Note 4)

pF3C

OUT

Output Capacitance

dB105A

ISO

Off-Isolation (MAX4159 only)

dBc50THDTotal Harmonic Distortion

Ω9Z

OUT

Output Impedance

dB70XtalkChannel-to-Channel Crosstalk

degrees0.01DPDifferential Phase Error

Channel on or off pF2C

IN

Input Capacitance

f = 100kHz

f = 100kHz

f = 100kHz

pA/√Hz

22in(FB)FB Current-Noise Density

pA/√Hz

2i

n

Input Current-Noise Density

nV/√Hz

2e

n

Input Voltage-Noise Density

(Notes 6, 7) ns20t

SW

Channel Switching Time

TA= T

MIN

to T

MAX

(Notes 6, 8) ns10t

S

Address Setup Time

(Note 6)

TA= T

MIN

to T

MAX

(Notes 6, 8)

ns20t

LPD

Latch Propagation Delay

ns10t

TH

Address Hold Time

TA= T

MIN

to T

MAX

(Notes 6, 8) ns10t

LPW

Latch Pulse Width

(Notes 6, 9) ns20t

PDE

Enable Delay Time

AV= 0dB (Notes 4, 10)

(Notes 6, 9)

mV±70V

TRAN

Switching Transient

ns20t

PDD

Disable Delay Time

LOGIC CHARACTERISTICS (Note 3)

AMPLIFIER CHARACTERISTICS

SWITCHING CHARACTERISTICS

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—MAX4258/MAX4259

(V+ = +5V, V- = -5V, VIN= 0V, V

OUT

= 0V, RL= 100Ω, TA= +25°C, unless otherwise noted.)

f = 30MHz, V

OUT

= 2Vp-p,

AV= 6dB (Note 4)

f = 30MHz, AV= 6dB (Note 4)

f = 30MHz, RS= 50Ω, AV= 6dB,
VIN= ±1Vp-p (Note 4)

AV= 6dB (Notes 4, 5)

f = 30MHz, AV= 6dB, EN = 5V,
V

IN

= ±1Vp-p (Note 4)

pF3C

OUT

Output Capacitance

dB110

AV= 6dB, V

OUT

= 2Vp-p (Note 4)

AV= 6dB, VIN= 20mVp-p (Note 4)

A

ISO

Off-Isolation (MAX4259)

AV= 6dB, VIN= 20mVp-p (Note 4)

dBc50THD

V

OUT

= 2V step, AV= 6dB (Note 4)

Total Harmonic Distortion

AV= 6dB, V

OUT

= 2Vp-p (Note 4)

CONDITIONS

Ω9Z

OUT

Output Impedance

dB70XtalkChannel-to-Channel Crosstalk

degrees0.02DPDifferential Phase Error

Channel on or off pF2C

IN

Input Capacitance

f = 100kHz

f = 100kHz

f = 100kHz

pA/√Hz

22in(FB)FB Current-Noise Density

pA/√Hz

2i

n

Input Current-Noise Density

nV/√Hz

2e

n

Input Voltage-Noise Density

(Notes 6, 7) ns20t

SW

Channel-Switching Time

TA= T

MIN

to T

MAX

(Notes 6, 8) ns

ns10t

S

Settling Time to 0.1%

V/µs1000SRSlew Rate

10t

S

Address-Setup Time

(Note 6)

TA= T

MIN

to T

MAX

(Notes 6, 8)

(Notes 6, 9) ns20t

PDE

Enable Delay Time

AV= 6dB (Notes 4, 10)

(Notes 6, 9)

MHz200FPBWFull-Power Bandwidth

MHz130BW(0.1)Bandwidth for ±0.1dB Gain Flatness

MHz250BW-3dB Bandwidth

mV±90V

TRAN

ns20t

LPD

Latch Propagation Delay

ns10t

TH

Address-Hold Time

TA= T

MIN

to T

MAX

(Notes 6, 8) ns10t

LPW

Latch Pulse Width

UNITSMIN TYP MAXSYMBOLPARAMETER

Switching Transient

ns20t

PDD

Disable Delay Time

AV= 6dB (Notes 4, 5) %0.01DGDifferential Gain Error

Note 2: Does not include external feedback network resistance.
Note 3: Applies to all digital input pins (EN, LE, and A0).
Note 4: Specified with feedback network chosen for optimal AC performance. See Tables 1 and 2 for recommended component

values.

Note 5: Input test signal: 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0IRE to 100IRE). IRE is a unit of

video-signal amplitude developed by the International Radio Engineers. 140IRE = 1.0V.

Note 6: See timing diagram (Figure 5).
Note 7: Channel-switching time specified for switching between the two input channels; does not include signal rise/fall times for

switching between channels with different input voltages.

Note 8: Guaranteed by design; not production tested.
Note 9: Output enable/disable delay times do not include amplifier output slewing times.
Note 10: Switching transient measured while switching between two grounded channels.

AMPLIFIER CHARACTERISTICS

SWITCHING CHARACTERISTICS

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

_______________________________________________________________________________________

5

2

-8
1 10 100 1000

MAX4158/MAX4159

SMALL-SIGNAL FREQUENCY RESPONSE

-4

-6

0

-2

MAX4158/59-01

FREQUENCY (MHz)

GAIN (dB)

VIN = 20mVp-p
A

V

= +1V/V

R

F

= 430Ω

R

L

= 100Ω

0.2

-0.8
1 10 100 1000

MAX4158/MAX4159

GAIN FLATNESS vs. FREQUENCY

-0.4

-0.6

0

-0.2

MAX4158/59-02

FREQUENCY (MHz)

GAIN (dB)

VIN = 20mVp-p
A

V

= +1V/V

R

F

= 430Ω

R

L

= 100Ω

2

-8
1 10 100 1000

MAX4158/MAX4159

LARGE-SIGNAL FREQUENCY RESPONSE

-4

-6

0

-2

MAX4158/59-03

FREQUENCY (MHz)

GAIN (dB)

AV = +1V/V
R

F

= 430Ω

R

L

= 100Ω

2Vp-p OUTPUT

4Vp-p OUTPUT

8

-2
1 10 100 1000

MAX4258/MAX4259

SMALL-SIGNAL FREQUENCY RESPONSE

2

0

6

4

MAX4158/59-04

FREQUENCY (MHz)

GAIN (dB)

VIN = 20mVp-p
A

V

= +2V/V

R

F

= RG = 510Ω

R

L

= 100Ω

20

-180
1 10 100 1000

MAX4159

OFF ISOLATION vs. FREQUENCY

-80

-100

-120

-140

-160

-20

0

-60

-40

MAX4158/59-07a

FREQUENCY (MHz)

GAIN (dB)

AV = +1V/V
R

L

= 100Ω

R

F

= 430Ω

IN0 = ±2V
IN1 = GND
A0 = GND
EN = 5V

6.2

5.2
1 10 100 1000

MAX4258/MAX4259

GAIN FLATNESS vs. FREQUENCY

5.6

5.4

6.0

5.8

MAX4158/59-05

FREQUENCY (MHz)

GAIN (dB)

VIN = 20mVp-p
A

V

= +2V/V

R

F

= RG = 510Ω

R

L

= 100Ω

8

-2

1 10 100 1000

MAX4258/MAX4259

LARGE-SIGNAL FREQUENCY RESPONSE

2

0

6

4

MAX4158/59-06

FREQUENCY (MHz)

GAIN (dB)

AV = +2V/V
R

F

= RG = 510Ω

R

L

= 100Ω

2Vp-p OUTPUT

4Vp-p OUTPUT

20

-180
1 10 100 1000

MAX4259

OFF ISOLATION vs. FREQUENCY

-80

-100

-120

-140

-160

-20

0

-60

-40

MAX4158/59-07b

FREQUENCY (MHz)

GAIN (dB)

AV = +2V/V
R

L

= 100Ω

R

F

= RG = 510Ω

IN0 = ±1V
IN1 = GND
A0 = GND
EN = 5V

10

-90

0.1

0.01

1 10 100

MAX4158/MAX4159

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

-40

-50

-60

-70

-80

-10

0

-30

-20

MAX4158/59-08

FREQUENCY (MHz)

PSRR (dB)

AV = +1V/V
R

L

= 100Ω

R

F

= 430Ω

PSRR(+)

PSRR(-)

__________________________________________Typical Operating Characteristics

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

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

6 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

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

10

-90

0.1

0.01

1 10 100

MAX4258/MAX4259

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

-40

-50

-60

-70

-80

-10

0

-30

-20

MAX4158/59-09

FREQUENCY (MHz)

PSRR (dB)

AV = +2V/V
R

L

= 100Ω

R

F

= RG = 510Ω

PSRR(+)

PSRR(-)

0

-100
10

1

100 1000

CROSSTALK vs. FREQUENCY

-50

-60

-70

-80

-90

-20

-10

-40

-30

MAX4158/59-10

FREQUENCY (MHz)

GAIN (dB)

VIN = ±2Vp-p (MAX4158/MAX4159)
V

IN

= ±1Vp-p (MAX4258/MAX4259)

R

S

= 50Ω

R

L

= 100Ω

100

0.01

0.1

0.01

1

10 100

OUTPUT IMPEDANCE vs. FREQUENCY

0.1

1

10

MAX4158/59-11

FREQUENCY (MHz)

OUTPUT IMPEDANCE (Ω)

MAX4158/MAX4159:
R

F

= 430Ω, AV = 1

MAX4258/MAX4259:
R

F

= RG = 510Ω, AV = 2

MAX4258/MAX4259

MAX4158/MAX4159

0

-100

-90

1 10 100

MAX4258/MAX4259

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

-70

-80

MAX4158/59-14b

FREQUENCY (MHz)

THD (dBc)

-50

-60

-30

-40

-20

-10

AV = +2V/V
V

OUT

= 2Vp-p

R

L

= 100Ω

R

F

= RG = 510Ω

3RD

THD

2ND

0.000

±0.020

±0.018

1 10 100

MAX4258/MAX4259

CHANNEL-TO-CHANNEL GAIN MATCHING

vs. FREQUENCY

±0.014
±0.016

MAX4158/59-13

FREQUENCY (MHz)

GAIN ERROR (dB)

±0.010
±0.012

±0.006
±0.008

±0.004

±0.002

AV = +2V/V
R

L

= 100Ω

R

F

= RG = 510Ω

V

IN

= 20mVp-p

0

-90
1 10 100

MAX4158/MAX4159

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

-70

-80

MAX4158/59-14a

FREQUENCY (MHz)

THD (dBc)

-50

-60

-30

-40

-20

-10

3RD

THD

AV = +1V/V
V

OUT

= 2Vp-p

R

L

= 100Ω

R

F

= 430Ω

2ND

10ns/div

MAX4158/MAX4159

LARGE-SIGNAL PULSE RESPONSE

+2V

IN
0V

+2V
OUT

0V

MAX4158/59-15

10ns/div

MAX4258/MAX4259

LARGE-SIGNAL PULSE RESPONSE

+1V
IN

0V

+2V
OUT

0V

MAX4158/59-16

0.000

±0.020

±0.018

1 10 100

MAX4158/MAX4159

CHANNEL-TO-CHANNEL GAIN MATCHING

vs. FREQUENCY

±0.014
±0.016

MAX4158/59-12

FREQUENCY (MHz)

GAIN ERROR (dB)

±0.010
±0.012

±0.006
±0.008

±0.004

±0.002

AV = +1V/V
R

L

= 100Ω

R

F

= 430Ω

V

IN

= 20mVp-p

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

_______________________________________________________________________________________

7

10ns/div

MAX4158/MAX4159

SMALL-SIGNAL PULSE RESPONSE

+100mV

0V IN

-100mV

+100mV
0V OUT

-100mV

MAX4158/59-17

10ns/div

MAX4258/MAX4259

SMALL-SIGNAL PULSE RESPONSE

+50mV
0V IN

-50mV

+100mV
0V OUT

-100mV

MAX4158/59-18

10ns/div

MAX4158/MAX4159 LARGE-SIGNAL

PULSE RESPONSE (C

L

= 20pF)

+2V

IN
0V

+2V
OUT

0V

MAX4158/59-19

10ns/div

MAX4258/MAX4259 LARGE-SIGNAL

PULSE RESPONSE (C

L

= 20pF)

+1V
IN

0V

+2V
OUT

0V

MAX4158/59-20

20ns/div

MAX4158/MAX4159

ADDRESS SWITCHING TRANSIENT

+6V

+4V

A0

+2V

0V
+100mV
0V OUT

-100mV

MAX4158/59-23

IN0 = IN1 = 0V

10ns/div

MAX4158/MAX4159 SMALL-SIGNAL

PULSE RESPONSE (C

L

= 20pF)

+100mV

0V IN

-100mV

+100mV

0V OUT

-100mV

MAX4158/59-21

10ns/div

MAX4258/MAX4259 SMALL-SIGNAL

PULSE RESPONSE (C

L

= 20pF)

+50mV
0V IN

-50mV

+100mV
0V OUT

-100mV

MAX4158/59-22

20ns/div

MAX4258/MAX4259

ADDRESS SWITCHING TRANSIENT

+6V

+4V

+2V

A0

0V

+100mV

0V OUT

-100mV

MAX4158/59-24

IN0 = IN1 = 0V

20ns/div

MAX4159/MAX4259

EN SWITCHING DELAY

+6V
+4V

+2V
0V

+2V
+1V OUT

0V

MAX4158/59-25

EN

____________________________Typical Operating Characteristics (continued)

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

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

8 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

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

0.03

0.02

0.01

0.00

-0.01

0.04

-0.03

-0.04
0 100

0 100

MAX4158/MAX4159

DIFFERENTIAL GAIN AND PHASE

-0.01

-0.02

-0.02

-0.03

-0.04

IRE

DIFF PHASE (deg)

DIFF GAIN (%)

0.04

0.03

0.02

0.01

0.00

MAX4158/59-26

0.03

0.02

0.01

0.00

-0.01

0.04

-0.03

-0.04

0 100

0 100

MAX4258/MAX4259

DIFFERENTIAL GAIN AND PHASE

-0.01

-0.02

-0.02

-0.03

-0.04

IRE

DIFF PHASE (deg)

DIFF GAIN (%)

0.04

0.03

0.02

0.01

0.00

MAX4158/59-27

12

8

-60 -40 20 100

SUPPLY CURRENT

vs. TEMPERATURE

9

11

MAX4158/59-28

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-20

0

401060 80

I+

EN = 0V

I-

3.50

2.50

-60 -40 20 100

TRANSIMPEDANCE
vs. TEMPERATURE

2.75

3.25

MAX4158/59-29

TEMPERATURE (°C)

TRANSIMPEDANCE (MΩ)

-20

0

40

3.00

60 80

5.0

3.0

-60 -40 20 100

POSITIVE OUTPUT SWING

vs. TEMPERATURE

3.5

4.5

MAX4158/59-32

TEMPERATURE (°C)

POSITIVE OUTPUT SWING (V)

-20

0

40

4.0

60 80

NO LOAD

50Ω LOAD

0.50

-0.50

-60 -40 20 100

INPUT BIAS CURRENT

vs. TEMPERATURE

-0.25

0.25

MAX4158/59-30

TEMPERATURE (°C)

INPUT BIAS CURRENT (µA)

-20

0

40060 80

0

-5

-60 -40 20 100

FB PIN BIAS CURRENT

vs. TEMPERATURE

-4

-3

-2

-1

MAX4158/59-31

TEMPERATURE (°C)

BIAS CURRENT (µA)

-20

0

40 60 80

-3.0

-5.0

-60 -40 20 100

NEGATIVE OUTPUT SWING

vs. TEMPERATURE

-4.5

-3.5

MAX4158/59-33

TEMPERATURE (°C)

NEGATIVE OUTPUT SWING (V)

-20

0

40

-4.0

60 80

NO LOAD

50Ω LOAD

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

_______________________________________________________________________________________ 9

____________________________Typical Operating Characteristics (continued)

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

______________________________________________________________Pin Description

1.50

0.50

-60 -40 20 100

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

0.75

1.25

MAX4158/59-34

TEMPERATURE (°C)

OFFSET VOLTAGE (V)

-20

0

40

1.00

60 80

150

100

-60 -40 20 100

OUTPUT SHORT-CIRCUIT CURRENT

vs. TEMPERATURE

110

120

140

130

MAX4158/59-35

TEMPERATURE (°C)

SHORT-CIRCUIT CURRENT (mA)

-20

0

40 60 80

POSITIVE OUTPUT

NEGATIVE OUTPUT

Positive Power-Supply Voltage116
Amplifier Output127
Channel-Address Logic Input (see

Truth Table

)138

Latch-Enable Logic Input (see

Truth Table

)14—

Amplifier Input, Channel 153
No Connect. Not internally connected. Connect to ground plane for best

RF performance.

——

Negative Power-Supply Voltage74
Amplifier Feedback Input95

Power Supply, Analog and Digital Ground. Connect GND to ground plane
for best RF performance.

2, 4, 6,

8, 10

2

Amplifier Input, Channel 031

Output Enable Logic Input. Connect EN to logic low or leave open for
normal operation. Connect to logic high to disconnect amplifier output
(output is high impedance).

1—

V+12

OUT13

A014
LE16

IN15

N.C.7, 15

V-8

FB10

GND

2, 4, 6,

9, 11

IN03

EN

1

SO QSOP

NAME FUNCTION

MAX4158
MAX4258

PIN

MAX4159
MAX4259

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

10 ______________________________________________________________________________________

_______________Detailed Description

The MAX4158/MAX4159 are optimized for closed-loop
gains (A

VCL

) of 1V/V (0dB) or greater; the MAX4258/
MAX4259 are optimized for closed-loop gains of 2V/V
(6dB) or greater. These low-power, high-speed, cur­rent-mode feedback amplifiers operate from ±5V sup­plies. They drive video loads (including 50Ω and 75Ω
cables) with excellent distortion characteristics.
Differential gain and phase errors are 0.01%/0.01° for
MAX4158/MAX4159 and 0.01%/0.02° for MAX4258/
MAX4259, respectively.

The input multiplexers feature very short switching
times and small switching transients. They also have
high input resistance and constant input capacitance,
so overall input impedance can be set by external input
terminating resistors. Each video input is isolated by an
AC-ground pin, which reduces channel-to-channel
capacitance and minimizes crosstalk.

The MAX4159/MAX4259 have address latching and an
output enable function that places the output in a high­impedance state. These functions allow multiple
mux/amps to be paralleled together to form larger
switching arrays.

________________________Truth Tables

Input Control Logic

X = Don’t Care

MAX4159/MAX4259

Output Control Logic

All logic levels (EN, LE, and A0) default low (0) if left open circuit.
Output disable is completely independent of input address and
latch.

__________Applications Information

Theory of Operation

Since the MAX4158/MAX4159/MAX4258/MAX4259 are
current-mode feedback amplifiers, their open-loop
transfer function is expressed as a transimpedance,
∆V

OUT

/∆IFB, or ZT. The frequency behavior of this
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 at high frequency.

Analyzing the current-mode feedback amplifier in a
gain configuration (Figure 1) yields the following trans­fer function:

V

OUT

/ VIN= G x Z

T(S)

/ (Z

T(S)

+ G x R

IN(FB)

+ RF)

where G = A

VCL

= 1 + RF/ RG.

At low gains, G x R

IN(FB)

<< RF. Therefore, unlike tradi­tional voltage-mode feedback amplifiers, the closed­loop bandwidth is essentially independent of
closed-loop gain. Note also that at low frequencies,
ZT>> [G x R

IN(FB)

+ RF] so:

V

OUT

/ VIN= G = 1 + RF/ R

G

Layout and Power-Supply Bypassing

The MAX4158/MAX4159/MAX4258/MAX4259 have
extremely high bandwidth, and consequently require
careful board layout, including the possible use of con­stant-impedance microstrip or stripline techniques.

MAX4158
MAX4159
MAX4258
MAX4259

R

G

FB

Z

T

R

IN(FB)

OUT

+1

IN0

IN1

V

IN

R

F

+1

Figure 1. Current-Mode Feedback Amplifier

On

AMPLIFIER

OUTPUT

Off

0 Output on

LOGIC

INPUT

(

EENN

)

FUNCTION

1 Output off; high impedance

LE A0

AMPLIFIER

INPUT

LOGIC

INPUTS

FUNCTION

[LAST]1 X

Channel addresses latched;
retains last input address.

IN10 1 Channel 1 selected

IN00 0 Channel 0 selected

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

______________________________________________________________________________________ 11

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 one exception: the feedback pin
(FB) should have as low a capacitance to ground as
possible. This means that there should be no ground
plane under FB or under the components (RFand RG)
connected to it. With multilayer boards, locate the
ground plane on a layer that incorporates no signal or
power traces.

Regardless of whether or not a constant-impedance
board is used, it is best to observe the following guide­lines when designing the board:

1) Do not use wire-wrap boards (they are much too
inductive) or breadboards (they are much too
capacitive).

2) Do not use IC sockets. IC sockets increase reac­tances.

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

4) Observe high-frequency bypassing techniques to
maintain the amplifier’s accuracy and stability.

5) Bear in mind that, in general, surface-mount compo­nents have shorter bodies and lower parasitic reac­tance, giving much better high-frequency
performance than through-hole components.

The bypass capacitors should include a 10nF ceramic
surface-mount capacitor between each supply pin and
the ground plane, located as close to the package as
possible. Optionally, place a 10µF tantalum capacitor at
the power-supply pins’ points of entry to the PC board
to ensure the integrity of incoming supplies. The power­supply trace should lead directly from the tantalum
capacitor to the V+ and V- pins. To minimize parasitic
inductance, keep PC traces short and use surface­mount components.

Ground pins have been placed between input channels
to minimize crosstalk between the two input channels.
(The grounds extend inside the package all the way to
the silicon.) These pins should be connected to a com­mon ground plane on the PC board.

Input termination resistors and output back-termination
resistors, if used, should be surface-mount types, and
should be placed as close to the IC pins as possible.

Choosing Feedback

_________________and Gain Resistors

As with all current-mode feedback amplifiers, the fre­quency response of the MAX4158/MAX4159/MAX4258/
MAX4259 is critically dependent on the value of the
feedback resistor RF. RF, in conjunction with an internal
compensation capacitor, forms the dominant pole in the
feedback loop. Reducing RF’s value increases the pole
frequency and the -3dB bandwidth, but also increases
peaking due to interaction with other nondominant
poles. Increasing RF’s value reduces peaking and
bandwidth.

Tables 1 and 2 show optimal values for the feedback
resistor (RF) and gain-setting resistor (RG) for all parts.
Note that the MAX4258/MAX4259 offer superior AC per­formance for all gains except unity gain (0dB). These
values provide optimal AC response using surface­mount resistors and good layout techniques. The
MAX4159/MAX4259 evaluation kit provides a practical
example of such layout techniques.

Stray capacitance at FB causes feedback resistor
decoupling and produces peaking in the frequency­response curve. Keep the capacitance at FB as low as
possible by using surface-mount resistors, and avoid­ing the use of a ground plane beneath or beside these
resistors and the FB pin. Some capacitance is unavoid­able; if necessary, its effects can be counteracted by
adjusting RF. 1% resistors are recommended to main­tain consistency over a wide range of production lots.

Table 1. MAX4158/MAX4159 Bandwidth
and Gain vs. Gain-Setting Resistors

200 1101102 6 110

5 14 80 12

40 6

32.5 130

14.510 20 130

-3dB BW
(MHz)

0.1dB BW
(MHz)

R

G

(Ω)

R

F

(Ω)

GAIN

350 100

∞

4301 0

(dB)(V/V)

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

12 ______________________________________________________________________________________

Table 2. MAX4258/MAX4259 Bandwidth
and Gain vs. Gain-Setting Resistors

DC Errors and Noise

The MAX4158/MAX4159/MAX4258/MAX4259 output
offset voltage, V

OUT

(Figure 2) can be calculated with

the following equation:
V

OUT

= VOSx [1 + RF/ RG] + IBx RSx [1 + RF/ RG] +

IFBx R

F

where:

V

OS

= input offset voltage (in volts)
1 + RF/ RG= amplifier closed-loop gain (dimensionless)
I

B

= input bias current (in amps)
I

FB

= feedback input bias current (in amps)
R

G

= gain-setting resistor (in ohms)
R

F

= feedback resistor (in ohms)
R

S

= source resistor (in ohms)

The following equation represents output noise density:

where:

in= input noise current density (in A/√Hz)
en= input noise voltage density (in V/√Hz)

The MAX4158/MAX4159/MAX4258/MAX4259 have a
very low, 2nV/√Hz noise voltage. The current noise at
the input (in) is 2pA/√Hz, and the current noise at the
feedback input (i

n(FB)

) is 22pA/√Hz.

An example of DC-error calculations, using the
MAX4258 typical data and the typical operating circuit
with RF= RG= 510Ω (RF|| RG= 255Ω) and RS= 50Ω,
gives:

V

OUT

= [1 x 10-3x (1 + 1)] + [2 x 10-6x 50 x (1 + 1)] +

[2 x 10-6x 510]

V

OUT

= 3.22mV

Calculating total output noise in a similar manner yields
the following:

With a 200MHz system bandwidth, this calculates to
168µV

RMS

(approximately 1.01mVp-p, using the six-

sigma calculation).

Video Line Driver

The MAX4158/MAX4159/MAX4258/MAX4259 are opti­mized to drive coaxial transmission lines when the
cable is terminated at both ends (Figure 3). Cable fre­quency response may cause variations in the flatness
of the signal.

e

n

OUT

= 1 + 1

e

n

OUT

= 1.9nV/ Hz

( )

( )

( )

















+

















+







− − −

x

x x x x x2 10 50

2

22 10 255

2

2 10

2

1

12 12 9

e OUT = 1+R /R

n F G

( ) ( )

[ ]

+

( )











+

[ ]

( )

||

x

i x R i x R R e

n S n

FB

F G n

2

2

2

MAX4158
MAX4159
MAX4258
MAX4259

R

G

FB

I

FB

I

B

IN_

V

OUT

OUT

R

S

R

F

5 14 195 92

90 14

-3dB BW
(MHz)

0.1dB BW
(MHz)

45 180

250 130510

20

R

G

(Ω)

R

F

(Ω)

10 20 180

2 6

GAIN

510

(V/V) (dB)

Figure 2. Output Offset Voltage

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

______________________________________________________________________________________ 13

Driving Capacitive Loads

A correctly terminated transmission line is purely resis­tive and presents no capacitive load to the amplifier.
Consequently, the MAX4158/MAX4159/MAX4258/
MAX4259 are optimized for AC performance and are
not designed to drive highly capacitive loads. Reactive
loads will decrease phase margin and may produce
excessive ringing and oscillation (see

Typical

Operating Characteristics

). The circuit of Figure 4
reduces this problem. The small (usually 5Ω to 20Ω)
isolation resistor R

ISO

, placed before the reactive load,
prevents ringing and oscillation. At higher capacitive
loads, AC performance is limited by the interaction of
load capacitance with the isolation resistor.

MAX4158
MAX4159
MAX4258
MAX4259

R

G

FB

IN_

R

ISO

OUT

R

F

C

L

R

L

Figure 4. Using an Isolation Resistor (R

ISO

) for High

Capacitive Loads

Figure 3. Video Line Driver

R

G

FB

75Ω CABLE

75Ω CABLE

75Ω

INO

INI

R

T

R

T

75Ω

R

F

OUT

MAX4158
MAX4159
MAX4258
MAX4259

R

75Ω

T

75Ω CABLE

R

T

75Ω

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

14 ______________________________________________________________________________________

Input Voltage Range

The guaranteed input voltage range is ±2.5V. Exceeding
this value can cause unpredictable results, including out­put clipping, excessive input current, and switching
delays.

Multiplexer

The input multiplexer (mux) is controlled by TTL/CMOS­compatible address inputs (see

Truth Tables

.) There is

no internal memory except the address latch (LE) on

the MAX4159/MAX4259. If power is first applied with
the latch enabled, IN0 is selected.

Input capacitance is a constant, low 2pF for either input
channel, regardless of whether or not the channel is
selected.

All logic levels (EN, LE, and A0) default low if left open­circuit.

A0

t

S

t

H

ENABLE/DISABLE TIMES

HIGH IMPEDANCE

ADDRESSING TIMES

LE

EN

OUT

OUT

t

SW

t

PdD

t

PdE

t

LPD

t

LPW

Figure 5. Switching Timing Diagram

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel

Video Multiplexer-Amplifiers

______________________________________________________________________________________ 15

_____________________Pin Configurations/Functional Diagrams/Truth Tables

___________________Chip Information

TRANSISTOR COUNT: 239

14
13
12
11
10

9
8

1
2
3
4
5
6
7

LE
A0
OUT
V+

GND

IN0

GND

EN

MAX4159/MAX4259

GND
FB
GND

V-

GND

IN1

SO

N.C. = NOT INTERNALLY CONNECTEDX = DON’T CARE

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

LE
N.C.
A0
OUT
V+
GND
FB
GND

EN

GND

IN0

GND

IN1

GND

N.C.

V-

MAX4159/MAX4259

QSOP

TOP VIEW

LOGIC

LOGIC

EN

0
1

OUTPUT

MAX4159/MAX4259

ON

OFF (HI-Z)

LE

0
0
1

A0

0
1
X

INPUT

MAX4159/MAX4259

IN0
IN1

LAST

MAX4158/MAX4159/MAX4258/MAX4259

350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers

16 ______________________________________________________________________________________

________________________________________________________Package Information

8LUMAXD.EPS

QSOP.EPS