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19-0440; Rev 2; 4/97
KIT ATION EVALU ABLE AVAIL
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
____________________________Features
o 400MHz -3dB Bandwidth (MAX4112/MAX4117) 270MHz -3dB Bandwidth (MAX4113/MAX4119) 300MHz -3dB Bandwidth (MAX4118/MAX4120) o 0.1dB Gain Flatness to 115MHz o 1200V/s Slew Rate (MAX4112/MAX4117/MAX4119) 1800V/s Slew Rate (MAX4113/MAX4118/MAX4120) o 280MHz Full-Power Bandwidth (VO = 2Vp-p, MAX4112/MAX4117) 240MHz Full-Power Bandwidth (VO = 2Vp-p, MAX4113/MAX4118/MAX4120) o High Output Drive: 80mA o Low Power: 5mA Supply Current per Channel
_______________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 to 1800V/s 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 100 and a high current-drive capability of 80mA.
MAX4112/MAX4113/MAX4117-MAX4120
________________________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
______________Ordering Information
PART MAX4112ESA MAX4112EUA MAX4113ESA MAX4117ESA MAX4118ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 8 MAX* 8 SO 8 SO 8 SO
Ordering Information continued at end of data sheet. *Contact factory for MAX package availability.
__________________________________________________________Pin Configurations
TOP VIEW
MAX4119 MAX4120 MAX4112 MAX4113
8 7 6 5 N.C. OUTA 1 VCC INA- 2 3
MAX4119 MAX4120
14 OUTD 13 IND12 IND+ 11 VEE 10 INC+ 9 8 INCOUTC OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7 N.C. 8 16 OUTD 15 IND14 IND+ 13 VEE 12 INC+ 11 INC10 OUTC 9 N.C.
N.C. 1 IN- 2 IN+ 3 VEE 4
MAX4117 MAX4118
8 7 6 5
VCC OUTB INBINB+
OUTA 1 INA- 2 INA+ 3
OUT INA+ N.C.
VCC 4 INB+ 5 INB- 6
VEE 4
SO/MAX
SO
OUTB 7
SO QSOP ________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCC to VEE).......................................12V Input Voltage (IN_+, IN_-) ...................(VCC + 0.3V) to (VEE - 0.3V) IN_ _ Current (Note 1) ......................................................10mA Short-Circuit Duration (VOUT to GND) VIN < 1.5V ...............................................................Continuous VIN > 1.5V ..........................................................................0sec 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 9.52mW/C above +70C)..........762mW Operating Temperature Range MAX41_ _E_ _ ...................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
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.
ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Input Offset Voltage Input Offset Voltage Drift Positive Input Bias Current Negative Input Bias Current Input Resistance Input Voltage Noise Integrated Voltage Noise en EnRMS SYMBOL VOS TCVOS IB+ IBVOUT = 0V VOUT = 0V VOUT = 0V, VIN = -VOS VOUT = 0V, VIN = -VOS IN+ INf = 10kHz f = 1MHz to 100MHz MAX4112/MAX4117/ MAX4119 Positive Input Current Noise in+ f = 10kHz MAX4113/MAX4118/ MAX4120 f = 10kHz -2.5 VCM = 2.5V VS = 4.5V to 5.5V VOUT = 2.0V, VCM = 0V, RL = 100 VIN = 0V RL = RL = 100 RL = 30, TA = 0C to +85C MAX4112/MAX4117 Small Signal -3dB Bandwidth BWSS VOUT 0.1VRMS MAX4113/MAX4119 MAX4118/MAX4120 3.5 3.1 65 45 60 250 50 80 500 5 3.8 3.5 80 400 270 300 MHz 6.5 9 14 2.5 pA/Hz V dB dB k mA V mA CONDITIONS MIN TYP 1 10 3.5 3.5 500 30 2.2 27 13 pA/Hz 20 20 MAX 8 UNITS mV V/C A A k nV/Hz VRMS DC SPECIFICATIONS (RL = , unless otherwise noted)
Negative Input Current Noise Common-Mode Input Voltage Common-Mode Rejection Power-Supply Rejection Open-Loop Transimpedance Quiescent Supply Current per Amplifier Output Voltage Swing Output Current Drive
inVCM CMR PSR ZOL ISY VOUT IOUT
AC SPECIFICATIONS (RL = 100, unless otherwise noted)
2
_______________________________________________________________________________________
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX4112/MAX4117/MAX4119, AVCL = +2 MAX4113/MAX4118/MAX4120, AVCL = +8 MAX4112/MAX4117 Large-Signal -3dB Bandwidth BWLS VOUT = 2Vp-p MAX4119 MAX4113/MAX4118/ MAX4120 MAX4112/MAX4117/ MAX4119 MAX4113/MAX4118/ MAX4120 MAX4112/MAX4117/ MAX4119 MAX4113/MAX4118/ MAX4120 MAX4112/MAX4117/ MAX4119 MAX4113/MAX4118/ MAX4120 MIN TYP 100 115 280 145 240 1200 V/s 1800 15 10 ns 35 25 3 0.8 0.02 % 0.02 0.03 degrees 0.04 2 f = 10MHz, AVCL = +2 fC = 5MHz, VOUT = 2Vp-p MAX4112/MAX4117/ MAX4119, AVCL = +2 MAX4113/MAX4118/ MAX4120, AVCL = +8 0.9 -68 dBc -62 36 -75 dB dB pF ns to 0.01%, -1V VOUT 1V MHz MAX UNITS
MAX4112/MAX4113/MAX4117-MAX4120
AC SPECIFICATIONS (RL = 100, unless otherwise noted) (continued) 0.1dB Gain Flatness BW0.1dB MHz
Slew Rate
SR
-2V VOUT 2V
to 0.1%, -1V VOUT 1V Settling Time tS
Rise/Fall Times
tR, tF
10% to 90%, -2V VOUT 2V 10% to 90%, -50mV VOUT 50mV f = 3.58MHz, RL = 150 MAX4112/MAX4117/ MAX4119, AVCL = +2 MAX4113/MAX4118/ MAX4120, AVCL = +8 MAX4112/MAX4117/ MAX4119, AVCL = +2 MAX4113/MAX4118/ MAX4120, AVCL = +8
Differential Gain
DG
Differential Phase
DP
f = 3.58MHz, RL = 150
Input Capacitance Output Impedance
CIN ZOUT
Spurious-Free Dynamic Range
SFDR
Two-Tone Third-Order Intercept Crosstalk
IP3
MAX4112/MAX4117/MAX4119, fC = 10MHz, fC1 = 10.1MHz, AVCL = +2 All hostile, VIN = 1Vp-p, f = 10MHz
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.
_______________________________________________________________________________________
3
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = -5V, RF = 499, RL = 100, TA = +25C, unless otherwise noted.)
MAX4112/MAX4117/MAX4119 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
MAX4112/4113-01
MAX4112/MAX4117/MAX4119 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +5, +10)
3
NORMALIZED GAIN (dB)
MAX4112-insert A
MAX4112/MAX4117/MAX4119 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -6 RF = RG = 600 VOUT = 2Vp-p 0.1 1 10 FREQUENCY (MHz) 100 1000
MAX4112/4113-02
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -6 0.1 1 10 FREQUENCY (MHz) 100 RF = RG = 600 VOUT 100mVp-p
4
4
2 1 0 -1 -2 -3 -4 -5 -6 VOUT 100mVp-p 0.1 1 10 FREQUENCY (MHz) 100 AV = +10V/V RF = 499 RG = 54.9 AV = +5V/V RF = 499 RG = 124
1000
1000
MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +8)
MAX4112/4113-03
MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +20)
MAX4112/4113-4a
MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +50)
3
NORMALIZED GAIN (dB)
MAX4112/4113-4b
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -6 0.1 1 10 FREQUENCY (MHz) 100 RF = 500 RG = 68 VOUT 100mVp-p
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -6 RF = 330 RG = 18 VOUT 100mVp-p 0.1 1 10 FREQUENCY (MHz) 100
4
2 1 0 -1 -2 -3 -4 -5 -6 RF = 330 RG = 6.8 VOUT 100mVp-p 0.1 1 10 FREQUENCY (MHz) 100
1000
1000
1000
MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4112-05
MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +10)
MAX4112-07
MAX4112/MAX4117/MAX4119 LARGE-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4112-08
IN VOLTAGE (25mV/div)
GND VOLTAGE (20mV/div)
IN
GND VOLTAGE (1V/div)
IN
GND
OUT
GND OUT GND
OUT
GND
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
4
_______________________________________________________________________________________
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RF = 499, RL = 100, TA = +25C, unless otherwise noted.)
MAX4112/MAX4117/MAX4119 LARGE-SIGNAL PULSE RESPONSE (AVCL = +10)
MAX4112-10
MAX4112/MAX4113/MAX4117-MAX4120
IN VOLTAGE (1V/div)
GND VOLTAGE (50mV/div)
IN
GND VOLTAGE (20mV/div)
MAX4112-12
IN
GND
OUT
GND
OUT
GND
OUT
GND
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
MAX4113/MAX4118/MAX4120 SMALL-SIGNAL PULSE RESPONSE (AVCL = +20)
MAX4112-14
MAX4113/MAX4118/MAX4120 LARGE-SIGNAL PULSE RESPONSE (AVCL = +8)
MAX4112-15
MAX4113/MAX4118/MAX4120 LARGE-SIGNAL PULSE RESPONSE (AVCL = +20)
MAX4112-16
IN VOLTAGE (20mV/div)
GND VOLTAGE (1V/div)
IN
GND VOLTAGE (1V/div)
IN
OUT
GND
OUT
GND
OUT
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
MAX4112/MAX4117/MAX4119 SETTLING TIME vs. GAIN
MAX4112/4113 -17a
MAX4113/MAX4118/MAX4120 SETTLING TIME vs. GAIN
MAX4112/4113 -17b
MAX4117-MAX4120 CROSSTALK vs. FREQUENCY
-30 -40
AMPLITUDE (dB)
MAX4112/4113-18a
30
40 35 SETTLING TIME (ns) 30 25 20 15
-20
SETTLING TIME (ns)
20
-50 -60 -70 -80 -90 -100 -110 -120
10
0 2 4 6 GAIN (V/V) 8 10
10 8 16 24 32 GAIN (V/V) 40 48 56
0.1
1
10
100
FREQUENCY (MHz)
_______________________________________________________________________________________
MAX4112-13
MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2, CL = 10pF)
MAX4113/MAX4118/MAX4120 SMALL-SIGNAL PULSE RESPONSE (AVCL = +8)
GND
GND
5
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RF = 499, RL = 100, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4112/4113-18b
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX4112/4113-19
MAX4112/MAX4117/MAX4119 INPUT CURRENT NOISE vs. FREQUENCY
MAX4112/4113-20
105 POWER-SUPPLY REJECTION (dB) 95 75 55 35 15 -5 0.1 1 10 FREQUENCY (MHz) 100
100
1000
NOISE (nV/Hz)
10 MAX4112/MAX4117/MAX4119
NOISE (pA/Hz)
MAX4113/MAX4118/MAX4120
IN+, IN-
100
1 1000 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
10 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
MAX4113/MAX4118/MAX4120 INPUT CURRENT NOISE vs. FREQUENCY
MAX4112/4113-21
CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY
MAX4112/4113-22
MAX4112/MAX4117/MAX4119 HARMONIC DISTORTION vs. FREQUENCY
-10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 3rd (AVCL = +2, AVCL = +5) 0.1 1 10 100 2nd (AVCL = +2) VOUT = 2Vp-p 2nd (AVCL = +5)
MAX4112/4113-23
1000 INNOISE (pA/Hz) 100 IN+ 10
1000
0
OUTPUT IMPEDANCE ()
100
10
1
1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.1 0.1 1 10 FREQUENCY (MHz) 100 500
-100 FREQUENCY (MHz)
MAX4113/MAX4118/MAX4120 HARMONIC DISTORTION vs. FREQUENCY
MAX4112/4113-24
MAX4112/MAX4117/MAX4119 5MHz HARMONIC DISTORTION vs. OUTPUT SWING
MAX4112/4113 -26
MAX4112/MAX4117/MAX4119 5MHz HARMONIC DISTORTION vs. LOAD RESISTANCE
-10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 3rd 0 200 400 600 800 1000 2nd AVCL = +2 VOUT = 2Vp-p
MAX4112/4113-27
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 3rd (AVCL = +8) 3rd (AVCL = +20) VOUT = 2Vp-p 2nd (AVCL = +8) 2nd (AVCL = +20)
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 3rd 0.5 1.0 1.5 2.0 2.5 3.0 3.5 2nd AVCL = +2
0
100
4.0
FREQUENCY (MHz)
OUTPUT SWING (Vp-p)
LOAD RESISTANCE ()
6
_______________________________________________________________________________________
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RF = 499, RL = 100, TA = +25C, unless otherwise noted.)
MAX4113/MAX4118/MAX4120 5MHz HARMONIC DISTORTION vs. OUTPUT SWING
MAX4112/4113-28
MAX4112/MAX4113/MAX4117-MAX4120
MAX4113/MAX4118/MAX4120 5MHz HARMONIC DISTORTION vs. LOAD RESISTANCE
MAX4112/4113-29
TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY
MAX4112/MAX4117/MAX4119 35 30 25 20 15 10 5 0 MAX4113/MAX4118/MAX4120
MAX4112/4113-30
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 2nd AVCL = +8
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 3rd 0 200 400 600 800 2nd AVCL = +8 VOUT = 2Vp-p
40 THIRD-ORDER INTERCEPT (dBm)
3rd
4.0
1000
0.1
1
10
100
OUTPUT VOLTAGE SWING (Vp-p)
LOAD RESISTANCE ()
FREQUENCY (MHz)
MAX4112/MAX4117/MAX4119 DIFFERENTIAL GAIN and PHASE
0.005 0.000 -0.005 -0.010 -0.015 -0.020 -0.025 0.04 PHASE (degrees) PHASE (degrees) 0.03 0.02 0.01 0.00 -0.01 0 IRE 100 RL = 150
MAX4112/4113-31
MAX4113/MAX4118/MAX4120 DIFFERENTIAL GAIN and PHASE
MAX4112/4113-32
OPEN-LOOP TRANSIMPEDANCE vs. TEMPERATURE
MAX4112/MAX4117/MAX4119
MAX4112/4113-33
0.025 0.020 GAIN (%) 0.015 0.010 0.005 0.000 -0.005
900 800 TRANSIMPEDANCE (k) 700 600 500 400 300 MAX4113/MAX4118/MAX4120
RL = 150
GAIN (%)
RL = 150
0
IRE
100
0 0.04 0.02 0.00 -0.02 -0.04 -0.06 0 RL = 150
IRE
100
200 -75 IRE 100 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
POSITIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE
MAX4112/4113-34a
NEGATIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE
MAX4112/4113-34b
POSITIVE INPUT BIAS CURRENT vs. TEMPERATURE
MAX4112/4113-35a
4.40 4.20 OUTPUT VOLTAGE SWING (V) 4.00 3.80 3.60 3.40 3.20 3.00 -75 RL = 100 -50 -25 0 25 50 75 RL =
-3.00 -3.20 OUTPUT VOLTAGE SWING (V) -3.40 -3.60 -3.80 -4.00 -4.20 -4.40 -75 RL = RL = 100
-2.00 -2.50 INPUT BIAS CURRENT (A) -3.00 -3.50 -4.00 -4.50 -5.00
100 125
-50
-25
0
25
50
75
100 125
-75
-50
-25
0
25
50
75
100 125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
_______________________________________________________________________________________
7
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RF = 499, RL = 100, TA = +25C, unless otherwise noted.)
NEGATIVE INPUT BIAS (IB-) CURRENT vs. TEMPERATURE
MAX4112/4113-36
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4112/4113 -37
8 7 INPUT BIAS CURRENT (A) 6 5 4 3 2 1 0 -75 -50 -25 0 25 50 75
3
2 VOLTAGE (mV) 100 125
1
0
-1 -75 -50 -25 TEMPERATURE (C) 0 25 50 75 TEMPERATURE (C) 100 125
POWER-SUPPLY CURRENT vs. TEMPERATURE (PER AMPLIFIER)
MAX4112/4113-38
OUTPUT SWING vs. LOAD RESISTANCE
7.0 OUTPUT SWING (Vp-p) 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0
MAX4112/4113-39
8.00 6.00 4.00 CURRENT (mA) 2.00 0 -2.00 -4.00 -6.00 -8.00 -75 -50 -25 0 25 50 75 IEE ICC
7.5
100 125
25
50
75
100
125
150
TEMPERATURE (C)
LOAD RESISTANCE ()
8
_______________________________________________________________________________________
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
_____________________________________________________________Pin Descriptions
PIN MAX4112 MAX4117 NAME MAX4113 MAX4118 SO/MAX SO 1, 5, 8 -- 2 -- 3 -- 4 -- 6 -- -- 7 -- 1 -- 2 -- 3 4 5 -- 6 7 8 N.C. OUTA ININAIN+ INA+ VEE INB+ OUT INBOUTB VCC FUNCTION FUNCTION No Connection. Not internally connected. Amplifier A Output Inverting Input Amplifier A Inverting Input Noninverting Input Amplifier A Noninverting Input Negative Power Supply. Connect to -5V. Amplifier B Noninverting Input Amplifier Output Amplifier B Inverting Input Amplifier B Output Positive Power Supply. Connect to +5V. 8 9 10 11 12 10 11 12 13 14 15 16 INCINC+ VEE IND+ IND5 6 7 -- 5 6 7 8, 9 PIN MAX4119/MAX4120 SO 1 2 3 4 QSOP 1 2 3 4 OUTA INAINA+ VCC INB+ INBOUTB N.C. Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Positive Power Supply. Connect to +5V. Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output No Connection. Not internally connected. Amplifier C Inverting Input Amplifier C Noninverting Input Negative Power Supply. Connect to -5V. Amplifier D Noninverting Input Amplifier D Inverting Input NAME FUNCTION
MAX4112/MAX4113/MAX4117-MAX4120
OUTC Amplifier C Output
_______________Detailed Description
The MAX4112/MAX4117/MAX4119 are optimized for closed-loop gains (AVCL) 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
RG RF
13 14
OUTD Amplifier D Output
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, VOUT/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:
RIN
+1 +1 ZOL
VOUT
VIN
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
ZOL(S) VOUT = Gx VIN ZOL(S) + G x (RIN + RF )
where G = AVCL = 1 + (RF / RG), and RIN = 1 /gM 30.
Figure 1. Current Feedback Amplifier
_______________________________________________________________________________________ 9
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
At low gains, G x RIN << RF. Therefore, the closed-loop bandwidth is essentially independent of closed-loop gain. Similarly, ZOL >> RF at low frequencies, so that:
VIN RG RT RF RO VOUT
VOUT = G = 1 + (RF / RG ) VIN
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
VOUT = -(RF/RG) x VIN
RS
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
Figure 2a. Inverting Gain Configuration
RG
RF RO VOUT
VIN RT
VOUT = [1+ (RF/RG)] x VIN
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
Figure 2b. Noninverting Gain Configuration
0.01F to 0.1F ceramic capacitor in parallel with each 1000pF capacitor, and as close to them as possible. Then place a 10F to 15F 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 VEE pins. To minimize parasitic inductance, keep PC traces short and use surface-mount components.
Table 1. Recommended Component Values
COMPONENT RF () RG () RO () RT () -3dB Small-Signal Bandwidth (MHz) 0.1dB Gain Flatness (MHz) Large-Signal Bandwidth (MHz) AVCL = +2 MAX4112 600 600 49.9 49.9 400 100 280 MAX4117 600 600 49.9 49.9 400 100 280 MAX4119 500 500 49.9 49.9 270 100 145 MAX4113 500 69 49.9 49.9 270 115 240 AVCL = +8 MAX4118 330 47 49.9 49.9 300 115 240 MAX4120 330 47 49.9 49.9 300 115 240
10
______________________________________________________________________________________
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers
RG RF IBIB+ RS VOUT
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
An example of the DC error calculations, using the MAX4112 typical data and the typical operating circuit where RF = RG = 600 (RF || RG = 300) and RS = 50, gives the following: VOUT = (3.5 x 10-6 x 50 + 3.5 x 10-6 x 300 + 10-3) (1 + 1) VOUT = 4.45mV Calculating total output noise in a similar manner yields:
en(OUT) = (1 + 1) 13x10-12 x50 en(OUT) = 9.4nV/ Hz
MAX4112/MAX4113/MAX4117-MAX4120
Figure 3. Output Offset Voltage
(
) + (14x10
2
-12
x300
) + (2x10 )
2 -9
2
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).
With a 200MHz system bandwidth, this calculates to 133VRMS (approximately 797Vp-p, choosing the sixsigma 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.
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 50 or 75), plus the negative input bias current (IB-) times the parallel combination of RG and 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:
R VOUT = (IB+ )RS + (IB- )(RF || RG + VOS 1+ F RG
[
)
]
c) The total output-referred noise voltage is:
R en(OUT) = 1 + F RG
2 2 [(in + )RS ] + [(in - )RF || RG ] + (en )2
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.
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.
______________________________________________________________________________________
11
Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4113/MAX4117-MAX4120
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 5 to 22) 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.
RG RF 75 75 CABLE VIDEO IN 75 CABLE VIDEO OUT 12 10 8 6 CL = 5pF 4 2 0 0.1 1 10 100 1000 FREQUENCY (MHz) CL = 15pF CL = 10pF
75
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
75
Figure 5b. Frequency Response vs. Capacitive Load-- No Isolation Resistor
GAIN (dB)
12 CL = 10pF 10 8 GAIN (dB) 6 4 2 0 RS = 22 RS = 0 RS = 4.7 RS = 10
Figure 4. Video Line Driver
RG
RF RS
VIN
MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120
CL
RL -2 0.1 1 10 100 1000 FREQUENCY (MHz)
Figure 5c. Frequency Response vs. Isolation Resistance (see Figure 5a for circuit)
Figure 5a. Using an Isolation Resistor (RS) for High Capacitive Loads
___________________Chip Information
TRANSISTOR COUNT: 53 (MAX4112/MAX4113) 112 (MAX4117/MAX4118) 220 (MAX4119/MAX4120) SUBSTRATE CONNECTED TO VEE
_Ordering Information (continued)
PART MAX4119ESD MAX4119EEE MAX4120ESD MAX4120EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 14 SO 16 QSOP* 14 SO 16 QSOP*
*Contact factory for QSOP package availability.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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