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19-1164; Rev 1; 3/97
ANUAL N KIT M LUATIO ATA SHEET EVA WS D FOLLO
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
____________________________Features
_______________General Description
The MAX4158/MAX4159/MAX4258/MAX4259 are wideband, 2-channel, noninverting video amplifiers with input multiplexing, capable of driving 2.5V signals into 50 or 75 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 MAX and SO packages.
MAX4158/MAX4159/MAX4258/MAX4259
o Excellent Video Specifications: 0.1dB Gain Flatness to 130MHz 0.01%/0.01 Differential Gain/Phase Error o High Speed: 350MHz -3dB Bandwidth (MAX4158/4159) 250MHz -3dB Bandwidth (MAX4258/4259) 700V/s Slew Rate (MAX4158/4159) 1000V/s Slew Rate (MAX4258/4259) 20ns Settling Time to 0.1% o Fast Switching: 20ns Channel-Switching Time <70mV Switching Transient o Low Power: 100mW o Directly Drive 75 or 50 Cables o High Output Current Drive: >70mA o Address Latch and High-Z Output Disable
______________Ordering Information
PART MAX4158ESA MAX4158EUA MAX4159ESD MAX4159EEE MAX4258ESA MAX4258EUA MAX4259ESD MAX4259EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 8 MAX 14 SO 16 QSOP 8 SO 8 MAX 14 SO 16 QSOP
________________________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
_________________Pin Configurations
TOP VIEW
MAX4158/MAX4258
IN0 1 GND 2 IN1 3 V- 4 8 7 6 5 A0 OUT V+ FB MAX4158/MAX4258 A0 0 1 INPUT IN0 IN1
SO/MAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
ABSOLUTE MAXIMUM RATINGS
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 (TA = +70C) 8-Pin SO (derate 5.88mW/C above +70C).................471mW 8-Pin MAX (derate 4.10mW/C above +70C) ............330mW 14-Pin SO (derate 8.33mW/C above +70C)...............667mW 16-Pin QSOP (derate 8.33mW/C above +70C)..........667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Continuous power dissipation maximum rating must also be observed.
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.
DC ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5V, VIN = 0V, VOUT = 0V, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Supply-Voltage Range Input Voltage Range Input Offset Voltage (Either Channel) Input Offset Voltage Temperature Coefficient (Either Channel) Input Bias Current (Channel On) FB Pin Bias Current Input Resistance FB Pin Input Resistance Output Resistance Disabled Output Resistance Open-Loop Transimpedance DC Common-Mode Rejection Ratio DC Power-Supply Rejection Ratio Output Voltage Swing Output Current Output Short-Circuit Current Positive Supply Current SYMBOL V+, VVIN VOS TCVOS IIN IFB RIN RIN(FB) ROUT ROUT(d) ZT CMRR PSRR VOUT IOUT ISC I+ f = 0Hz MAX4159/MAX4259 only, EN = 5V, VOUT = -3.0V to 3.0V (Note 2) VOUT = -2.5V to 2.5V, RL = 100 VIN = -2.5V to 2.5V Open loop, V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V RL = open circuit RL = 50 VOUT = -2.5V to 2.5V Sinking or sourcing to ground MAX4158/MAX4258 EN = GND, MAX4159/MAX4259 EN = V+, MAX4159/MAX4259 MAX4158/MAX4258 Negative Supply Current IEN = GND, MAX4159/MAX4259 EN = V+, MAX4159/MAX4259 2 1 1.5 50 60 3.0 2.5 70 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX VIN = -2.5V to 2.5V Channel on Channel off 100 1 550 20 50 40 10 3.0 60 78 4.0 3.5 100 120 10.9 10.9 6.3 9.9 9.9 5.0 13.0 13.0 8.0 12.0 12.0 7.0 mA mA 2 CONDITIONS Inferred from the PSRR test Inferred from the CMRR test MIN 4.5 2.5 3.0 1 2 2 10 18 12 20 6 TYP MAX 5.5 UNITS V V mV V/C A A k M m M M dB dB V mA mA
_______________________________________________________________________________________
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
DC ELECTRICAL CHARACTERISTICS (continued)
(V+ = +5V, V- = -5V, VIN = 0V, VOUT = 0V, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER LOGIC CHARACTERISTICS (Note 3) Logic-Low Threshold Logic-High Threshold Logic-Low Input Current Logic-High Input Current VIL VIH IIL IIH VIL = 0V VIH = 5.5V, V+ = +5.5V 2.0 -2 130 -20 300 0.8 V V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4158/MAX4159/MAX4258/MAX4259
AC ELECTRICAL CHARACTERISTICS--MAX4158/MAX4159
(V+ = +5V, V- = -5V, VIN = 0V, VOUT = 0V, RL = 100, TA = +25C, unless otherwise noted.) PARAMETER AMPLIFIER CHARACTERISTICS -3dB Bandwidth Bandwidth for 0.1dB Gain Flatness Full-Power Bandwidth Slew Rate Settling Time to 0.1% Differential Gain Error Differential Phase Error Channel-to-Channel Crosstalk Output Impedance Total Harmonic Distortion Off-Isolation (MAX4159 only) Output Capacitance Input Capacitance Input Voltage-Noise Density Input Current-Noise Density FB Current-Noise Density SWITCHING CHARACTERISTICS Channel Switching Time Address Setup Time Address Hold Time Latch Propagation Delay Latch Pulse Width Enable Delay Time Disable Delay Time Switching Transient BW BW(0.1) FPBW SR tS DG DP Xtalk ZOUT THD AISO COUT CIN en in in(FB) tSW tS tTH tLPD tLPW tPDE tPDD VTRAN Channel on or off f = 100kHz f = 100kHz f = 100kHz (Notes 6, 7) TA = TMIN to TMAX (Notes 6, 8) TA = TMIN to TMAX (Notes 6, 8) (Note 6) TA = TMIN to TMAX (Notes 6, 8) (Notes 6, 9) (Notes 6, 9) AV = 0dB (Notes 4, 10) 10 20 20 70 10 10 20 AV = 0dB, VIN = 20mVp-p (Note 4) AV = 0dB, VIN = 20mVp-p (Note 4) AV = 0dB, VOUT = 2Vp-p (Note 4) AV = 0dB, VOUT = 2Vp-p (Note 4) VOUT = 2V step, AV = 0dB (Note 4) AV = 0dB (Notes 4, 5) AV = 0dB (Notes 4, 5) f = 30MHz, RS = 50, AV = 0dB, VIN = 2Vp-p (Note 4) f = 30MHz, AV = 0dB (Note 4) f = 30MHz, VOUT = 2Vp-p, AV = 0dB (Note 4) f = 30MHz, AV = 0dB, EN = 5V, VIN = 2Vp-p (Note 4) 350 100 155 700 10 0.01 0.01 70 9 50 105 3 2 2 2 22 20 MHz MHz MHz V/s ns % degrees dB dBc dB pF pF nV/Hz pA/Hz pA/Hz ns ns ns ns ns ns ns mV SYMBOL CONDITIONS MIN TYP MAX UNITS
_______________________________________________________________________________________
3
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
AC ELECTRICAL CHARACTERISTICS--MAX4258/MAX4259
(V+ = +5V, V- = -5V, VIN = 0V, VOUT = 0V, RL = 100, TA = +25C, unless otherwise noted.) PARAMETER AMPLIFIER CHARACTERISTICS -3dB Bandwidth Bandwidth for 0.1dB Gain Flatness Full-Power Bandwidth Slew Rate Settling Time to 0.1% Differential Gain Error Differential Phase Error Channel-to-Channel Crosstalk Output Impedance Total Harmonic Distortion Off-Isolation (MAX4259) Output Capacitance Input Capacitance Input Voltage-Noise Density Input Current-Noise Density FB Current-Noise Density SWITCHING CHARACTERISTICS Channel-Switching Time Address-Setup Time Address-Hold Time Latch Propagation Delay Latch Pulse Width Enable Delay Time Disable Delay Time Switching Transient tSW tS tTH tLPD tLPW tPDE tPDD VTRAN (Notes 6, 7) TA = TMIN to TMAX (Notes 6, 8) TA = TMIN to TMAX (Notes 6, 8) (Note 6) TA = TMIN to TMAX (Notes 6, 8) (Notes 6, 9) (Notes 6, 9) AV = 6dB (Notes 4, 10) 10 20 20 90 10 10 20 20 ns ns ns ns ns ns ns mV BW BW(0.1) FPBW SR tS DG DP Xtalk ZOUT THD AISO COUT CIN en in in(FB) Channel on or off f = 100kHz f = 100kHz f = 100kHz AV = 6dB, VIN = 20mVp-p (Note 4) AV = 6dB, VIN = 20mVp-p (Note 4) AV = 6dB, VOUT = 2Vp-p (Note 4) AV = 6dB, VOUT = 2Vp-p (Note 4) VOUT = 2V step, AV = 6dB (Note 4) AV = 6dB (Notes 4, 5) AV = 6dB (Notes 4, 5) f = 30MHz, RS = 50, AV = 6dB, VIN = 1Vp-p (Note 4) f = 30MHz, AV = 6dB (Note 4) f = 30MHz, VOUT = 2Vp-p, AV = 6dB (Note 4) f = 30MHz, AV = 6dB, EN = 5V, VIN = 1Vp-p (Note 4) 250 130 200 1000 10 0.01 0.02 70 9 50 110 3 2 2 2 22 MHz MHz MHz V/s ns % degrees dB dBc dB pF pF nV/Hz pA/Hz pA/Hz SYMBOL CONDITIONS MIN TYP MAX UNITS
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.
4
_______________________________________________________________________________________
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
MAX4158/MAX4159 SMALL-SIGNAL FREQUENCY RESPONSE
MAX4158/59-01
MAX4158/MAX4159/MAX4258/MAX4259
MAX4158/MAX4159 GAIN FLATNESS vs. FREQUENCY
MAX4158/59-02
MAX4158/MAX4159 LARGE-SIGNAL FREQUENCY RESPONSE
MAX4158/59-03
2
0.2
2 2Vp-p OUTPUT
0 GAIN (dB) GAIN (dB)
0 GAIN (dB)
0
-2
-0.2
-2 4Vp-p OUTPUT -4
-4 VIN = 20mVp-p AV = +1V/V RF = 430 RL = 100 1 10 100 1000
-0.4 VIN = 20mVp-p AV = +1V/V RF = 430 RL = 100 1 10 100 1000
-6
-0.6
-6
AV = +1V/V RF = 430 RL = 100 1 10 100 1000
-8 FREQUENCY (MHz)
-0.8 FREQUENCY (MHz)
-8 FREQUENCY (MHz)
MAX4258/MAX4259 SMALL-SIGNAL FREQUENCY RESPONSE
MAX4158/59-04
MAX4258/MAX4259 GAIN FLATNESS vs. FREQUENCY
MAX4158/59-05
MAX4258/MAX4259 LARGE-SIGNAL FREQUENCY RESPONSE
MAX4158/59-06
8
6.2
8
6 GAIN (dB) GAIN (dB)
6.0
6 GAIN (dB)
2Vp-p OUTPUT
4
5.8
4
4Vp-p OUTPUT
2 VIN = 20mVp-p AV = +2V/V RF = RG = 510 RL = 100 1 10 100 1000
5.6 VIN = 20mVp-p AV = +2V/V RF = RG = 510 RL = 100 1 10 100 1000
2
0
5.4
0
AV = +2V/V RF = RG = 510 RL = 100 1 10 100 1000
-2 FREQUENCY (MHz)
5.2 FREQUENCY (MHz)
-2 FREQUENCY (MHz)
MAX4159 OFF ISOLATION vs. FREQUENCY
MAX4158/59-07a
MAX4259 OFF ISOLATION vs. FREQUENCY
MAX4158/59-07b
MAX4158/MAX4159 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
0 -10 -20 PSRR (dB) -30 -40 -50 -60 PSRR(+) AV = +1V/V RL = 100 RF = 430 0.01 0.1 1 FREQUENCY (MHz) 10 100 PSRR(-)
MAX4158/59-08
20 0 -20 -40 GAIN (dB) -60 -80 -100 -120 -140 -160 -180 1 10 100 AV = +1V/V RL = 100 RF = 430 IN0 = 2V IN1 = GND A0 = GND EN = 5V
20 0 -20 -40 GAIN (dB) -60 -80 -100 -120 -140 -160 -180 AV = +2V/V RL = 100 RF = RG = 510 1 10 100 IN0 = 1V IN1 = GND A0 = GND EN = 5V
10
-70 -80 -90 1000
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
5
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
____________________________Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
MAX4258/MAX4259 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4158/59-09
CROSSTALK vs. FREQUENCY
MAX4158/59-10
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4158/MAX4159: RF = 430, AV = 1 OUTPUT IMPEDANCE () 10 MAX4258/MAX4259: RF = RG = 510, AV = 2
MAX4158/59-11
10 0 -10 -20 PSRR (dB)
0 -10 -20 -30 GAIN (dB) VIN = 2Vp-p (MAX4158/MAX4159) VIN = 1Vp-p (MAX4258/MAX4259) RS = 50 RL = 100
100
-30 -40 -50 -60 -70 -80 -90 0.01 0.1 AV = +2V/V RL = 100 RF = RG = 510
PSRR(-)
-40 -50 -60 -70
1 MAX4258/MAX4259 0.1 MAX4158/MAX4159 0.01
PSRR(+)
-80 -90 -100
1 FREQUENCY (MHz)
10
100
1
10
100
1000
0.01
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4158/MAX4159 CHANNEL-TO-CHANNEL GAIN MATCHING vs. FREQUENCY
MAX4158/59-12
MAX4258/MAX4259 CHANNEL-TO-CHANNEL GAIN MATCHING vs. FREQUENCY
MAX4158/59-13
MAX4158/MAX4159 TOTAL HARMONIC DISTORTION vs. FREQUENCY
-10 -20 -30 THD (dBc) -40 -50 -60 -70 -80 -90 2ND 1 10 FREQUENCY (MHz) 100 3RD AV = +1V/V VOUT = 2Vp-p RL = 100 RF = 430 THD
MAX4158/59-14a MAX4158/59-16
0.000 0.002 0.004 GAIN ERROR (dB) 0.006 0.008 0.010 0.012 0.014 0.016 0.018 0.020 1 10 FREQUENCY (MHz) AV = +1V/V RL = 100 RF = 430 VIN = 20mVp-p
0.000 0.002 0.004 GAIN ERROR (dB) 0.006 0.008 0.010 0.012 0.014 0.016 0.018 0.020 AV = +2V/V RL = 100 RF = RG = 510 VIN = 20mVp-p
0
100
1
10 FREQUENCY (MHz)
100
MAX4258/MAX4259 TOTAL HARMONIC DISTORTION vs. FREQUENCY
-10 -20 -30 THD (dBc) -40 -50 -60 -70 -80 -90 -100 1 10 FREQUENCY (MHz) 100 2ND 3RD AV = +2V/V VOUT = 2Vp-p RL = 100 RF = RG = 510
MAX4158/59-14b
MAX4158/MAX4159 LARGE-SIGNAL PULSE RESPONSE
MAX4158/59-15
MAX4258/MAX4259 LARGE-SIGNAL PULSE RESPONSE
+2V IN 0V +1V IN 0V
0
THD
+2V OUT 0V 10ns/div 10ns/div
+2V OUT 0V
6
_______________________________________________________________________________________
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
____________________________Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
MAX4158/MAX4159 SMALL-SIGNAL PULSE RESPONSE
MAX4158/59-17
MAX4158/MAX4159/MAX4258/MAX4259
MAX4258/MAX4259 SMALL-SIGNAL PULSE RESPONSE
MAX4158/59-18
MAX4158/MAX4159 LARGE-SIGNAL PULSE RESPONSE (CL = 20pF)
MAX4158/59-19
+100mV 0V IN -100mV
+50mV 0V IN -50mV
+2V IN 0V
+100mV 0V OUT -100mV 10ns/div 10ns/div
+100mV 0V OUT -100mV 10ns/div
+2V OUT 0V
MAX4258/MAX4259 LARGE-SIGNAL PULSE RESPONSE (CL = 20pF)
MAX4158/59-20
MAX4158/MAX4159 SMALL-SIGNAL PULSE RESPONSE (CL = 20pF)
MAX4158/59-21
MAX4258/MAX4259 SMALL-SIGNAL PULSE RESPONSE (CL = 20pF)
MAX4158/59-22
+1V IN 0V
+100mV 0V IN -100mV
+50mV 0V IN -50mV
+2V OUT 0V 10ns/div 10ns/div
+100mV 0V OUT -100mV 10ns/div
+100mV 0V OUT -100mV
MAX4158/MAX4159 ADDRESS SWITCHING TRANSIENT
MAX4158/59-23
MAX4258/MAX4259 ADDRESS SWITCHING TRANSIENT
MAX4158/59-24
MAX4159/MAX4259 EN SWITCHING DELAY
MAX4158/59-25
+6V +4V A0 +2V 0V +100mV 0V OUT IN0 = IN1 = 0V 20ns/div -100mV IN0 = IN1 = 0V 20ns/div
+6V +4V A0 +2V 0V +100mV 0V OUT -100mV
+6V +4V EN +2V 0V +2V +1V OUT 0V 20ns/div
_______________________________________________________________________________________
7
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
____________________________Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
MAX4158/MAX4159 DIFFERENTIAL GAIN AND PHASE
0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 0 IRE 100 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 0 IRE 100
MAX4158/59-26
MAX4258/MAX4259 DIFFERENTIAL GAIN AND PHASE
MAX4158/59-27
SUPPLY CURRENT vs. TEMPERATURE
EN = 0V SUPPLY CURRENT (mA) 11 I+
MAX4158/59-28
DIFF GAIN (%)
0
100 DIFF PHASE (deg)
DIFF GAIN (%)
12
0
100
10
I-
DIFF PHASE (deg)
9
8 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
TRANSIMPEDANCE vs. TEMPERATURE
MAX4158/59-29
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4158/59-30
FB PIN BIAS CURRENT vs. TEMPERATURE
MAX4158/59-31
3.50
0.50
0
BIAS CURRENT (A)
3.25
INPUT BIAS CURRENT (A)
TRANSIMPEDANCE (M)
-1
0.25
-2
3.00
0
-3
2.75
-0.25
-4
2.50 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
-0.50 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
-5 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
POSITIVE OUTPUT SWING vs. TEMPERATURE
MAX4158/59-32
NEGATIVE OUTPUT SWING vs. TEMPERATURE
MAX4158/59-33
5.0 POSITIVE OUTPUT SWING (V)
-3.0 NEGATIVE OUTPUT SWING (V)
4.5 NO LOAD 4.0
-3.5
50 LOAD
-4.0
NO LOAD
3.5
50 LOAD
-4.5
3.0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
-5.0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
8
_______________________________________________________________________________________
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
____________________________Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4158/59-34
MAX4158/MAX4159/MAX4258/MAX4259
OUTPUT SHORT-CIRCUIT CURRENT vs. TEMPERATURE
POSITIVE OUTPUT 140
MAX4158/59-35
1.50
150 SHORT-CIRCUIT CURRENT (mA)
OFFSET VOLTAGE (V)
1.25
130
1.00
120 NEGATIVE OUTPUT 110
0.75
0.50 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
100 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
______________________________________________________________Pin Description
PIN MAX4159 MAX4259 SO -- 1 2 3 -- 4 5 6 7 8 -- 1 3 2, 4, 6, 8, 10 5 -- 7 9 11 12 13 14 QSOP 1 3 2, 4, 6, 9, 11 5 7, 15 8 10 12 13 14 16 EN IN0 GND IN1 N.C. VFB V+ OUT A0 LE 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). Amplifier Input, Channel 0 Power Supply, Analog and Digital Ground. Connect GND to ground plane for best RF performance. Amplifier Input, Channel 1 No Connect. Not internally connected. Connect to ground plane for best RF performance. Negative Power-Supply Voltage Amplifier Feedback Input Positive Power-Supply Voltage Amplifier Output Channel-Address Logic Input (see Truth Table) Latch-Enable Logic Input (see Truth Table) NAME FUNCTION
MAX4158 MAX4258
_______________________________________________________________________________________
9
350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
_______________Detailed Description
The MAX4158/MAX4159 are optimized for closed-loop gains (AVCL) 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 50 and 75 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.
__________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 /I FB , or Z T . 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: VOUT / VIN = G x ZT(S) / (ZT(S) + G x RIN(FB) + RF) where G = AVCL = 1 + RF / RG. At low gains, G x RIN(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 RIN(FB) + RF] so: VOUT / VIN = G = 1 + RF / RG
________________________Truth Tables
Input Control Logic
LOGIC INPUTS LE 0 0 1 A0 0 1 X
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.
AMPLIFIER INPUT IN0 IN1 [LAST]
FUNCTION
Channel 0 selected Channel 1 selected Channel addresses latched; retains last input address.
FB RG RF
X = Don't Care
MAX4159/MAX4259 Output Control Logic
LOGIC INPUT ( EN ) 0 1
RIN(FB) ZT +1 OUT
AMPLIFIER OUTPUT On Off
FUNCTION
+1 IN0 IN1
Output on Output off; high impedance
VIN
MAX4158 MAX4159 MAX4258 MAX4259
All logic levels (EN, LE, and A0) default low (0) if left open circuit. Output disable is completely independent of input address and latch.
Figure 1. Current-Mode Feedback Amplifier
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
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 (RF and 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 10F 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 R F '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.
MAX4158/MAX4159/MAX4258/MAX4259
Table 1. MAX4158/MAX4159 Bandwidth and Gain vs. Gain-Setting Resistors
GAIN (V/V) 1 2 5 10 (dB) 0 6 14 20 RG () RF () 430 110 130 130 -3dB BW (MHz) 350 200 80 40 0.1dB BW (MHz) 100 110 12 6
110 32.5 14.5
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
Table 2. MAX4258/MAX4259 Bandwidth and Gain vs. Gain-Setting Resistors
GAIN (V/V) 2 5 10 (dB) 6 14 20 RG () 510 45 20 RF () 510 180 180 -3dB BW (MHz) 250 195 90 0.1dB BW (MHz) 130 92 14
Calculating total output noise in a similar manner yields the following:
en OUT = 1 + 1 x 2 2 2 -12 -12 -9 2 x 10 x 50 + 22 x 10 x 255 + 2 x 10 en OUT = 11.9nV/ Hz
(
)(
)
(
)
DC Errors and Noise
The MAX4158/MAX4159/MAX4258/MAX4259 output offset voltage, VOUT (Figure 2) can be calculated with the following equation: VOUT = VOS x [1 + RF / RG] + IB x RS x [1 + RF / RG] + IFB x RF where: VOS = input offset voltage (in volts) 1 + RF / RG = amplifier closed-loop gain (dimensionless) IB = input bias current (in amps) IFB = feedback input bias current (in amps) = feedback resistor (in ohms) RS = source resistor (in ohms) The following equation represents output noise density: en OUT = 1+RF /RG x RG RF = gain-setting resistor (in ohms)
With a 200MHz system bandwidth, this calculates to 168VRMS (approximately 1.01mVp-p, using the sixsigma 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.
RG
RF
FB IFB OUT VOUT
(
)(
)
[in
x RS
]
2
+ in FB x RF || RG ( )
(
)
2
+ en
[]
2
IB IN_
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 (in(FB)) is 22pA/Hz. An example of DC-error calculations, using the MAX4258 typical data and the typical operating circuit with RF = RG = 510 (RF || RG = 255) and RS = 50, gives: VOUT = [1 x 10-3 x (1 + 1)] + [2 x 10-6 x 50 x (1 + 1)] + [2 x 10-6 x 510] VOUT = 3.22mV
RS
MAX4158 MAX4159 MAX4258 MAX4259
Figure 2. Output Offset Voltage
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
RG RF RG RF
FB 75 CABLE INO RT 75 INI RT 75 IN_ 75 CABLE OUT RT 75 75 CABLE FB OUT RISO
CL
RL
RT 75
MAX4158 MAX4159 MAX4258 MAX4259
MAX4158 MAX4159 MAX4258 MAX4259
Figure 3. Video Line Driver
Figure 4. Using an Isolation Resistor (RISO) for High Capacitive Loads
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 5 to 20) isolation resistor RISO, 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.
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
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. 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.
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
ADDRESSING TIMES
A0
tS
tH
LE
tSW OUT
tLPD
tLPW
ENABLE/DISABLE TIMES
EN tPdD HIGH IMPEDANCE OUT tPdE
Figure 5. Switching Timing Diagram
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers
_____________________Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX4158/MAX4159/MAX4258/MAX4259
MAX4159/MAX4259
EN 1 GND 2 IN0 3 GND 4 IN1 5 GND 6 V- 7 LOGIC 14 LE 13 A0 12 OUT 11 V+ 10 GND 9 8 FB GND EN 1 GND 2 IN0 3 GND 4 IN1 5 GND 6 N.C. 7 V- 8
MAX4159/MAX4259
LOGIC 16 LE 15 N.C. 14 A0 13 OUT 12 V+ 11 GND 10 FB 9 GND
SO QSOP
MAX4159/MAX4259 LE 0 0 1 A0 0 1 X INPUT IN0 IN1 LAST
MAX4159/MAX4259 EN 0 1 OUTPUT ON OFF (HI-Z)
X = DON'T CARE
N.C. = NOT INTERNALLY CONNECTED
___________________Chip Information
TRANSISTOR COUNT: 239
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350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers MAX4158/MAX4159/MAX4258/MAX4259
________________________________________________________Package Information
8LUMAXD.EPS
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QSOP.EPS

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