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19-1543; Rev 0; 10/99
EVALUATIO
N KIT AVA
ILABLE
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable
General Description
The MAX4444/MAX4445 differential line receivers offer unparalleled high-speed, low-distortion performance. Using a three op amp instrumentation amplifier architecture, these ICs have symmetrical differential inputs and a single-ended output. They operate from 5V supplies and are capable of driving a 100 load to 3.7V. The MAX4444 has an internally set closed-loop gain of +2V/V, while the MAX4445 is compensated for gains of +2V/V or greater, set by an external resistor. A low-power enable mode reduces current consumption to 3.5mA. Using current-feedback techniques, the MAX4444/ MAX4445 achieve a 550MHz bandwidth while maintaining up to a 5000V/s slew rate. Excellent differential gain/phase and noise specifications make these amplifiers ideal for a wide variety of video and RF signal-processing applications. An evaluation kit is available to speed design. o 5000V/s Slew Rate (MAX4444) o +2V/V Internally Fixed Gain (MAX4444) o External Gain Selection (MAX4445, AVCL +2V/V) o 550MHz -3dB Bandwidth o -60dB SFDR at 5MHz o Low Differential Gain/Phase: 0.07%/0.05 o Low Noise: 25nV/Hz at fIN = 100kHz o Low-Power Disable Mode Reduces Quiescent Current to 3.5mA
Features
MAX4444/MAX4445
Applications
Differential-to-Single-Ended Conversion Twisted-Pair to Coaxial Converter High-Speed Instrumentation Amplifier Data Acquisition Medical Instrumentation High-Speed Differential Line Receiver
PART MAX4444ESE MAX4445ESE
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 16 Narrow SO 16 Narrow SO
Typical Operating Circuit
+5V
Pin Configuration
TOP VIEW
VCC 1 16 GND 15 OUT 14 VEE
0.1F IN+ SIGNAL INPUT
VCC 2 IN- 3
EN VCC 75 OUT VEE 75 OUTPUT
N.C. (RG) 4 N.C. (RG) 5 IN+ 6 VEE 7
MAX4444 MAX4445
13 VEE 12 VEE 11 VEE 10 REF 9 EN
MAX4444
IN- REF GND
0.1F
VEE 8
SO
-5V
( ) ARE FOR MAX4445 ONLY.
________________________________________________________________ Maxim Integrated Products
1
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Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable MAX4444/MAX4445
ABSOLUTE MAXIMUM RATINGS
VCC to VEE ...........................................................................+12V Voltage on IN+, IN-, EN, OUT+, OUT-, RG, REF..............................(VEE - 0.3V) to (VCC + 0.3V) Current Into IN+, IN-, RG, EN .............................................20mA Output Short-Circuit Duration ...........................Indefinite to GND Continuous Power Dissipation (TA = +70C) 16-Pin Narrow SO (derate 20mW/C above +70C) ...1600mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C 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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, VEN = 2V, VCM = 0 , RL = , REF = GND, AVCL = +2V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Supply Voltage Range Input Common-Mode Voltage Range Differential Input Voltage Range Input Offset Voltage Input Offset-Voltage Temperature Coefficient Input Bias Current Input Offset Current Differential Input Resistance Gain Gain Error Gain-Error Drift Output Voltage Swing Output Current Drive Power-Supply Rejection Ratio Common-Mode Rejection Ratio Disable Output Resistance EN Logic Low Threshold EN Logic High Threshold EN Logic Input Low Current EN Logic Input High Current Quiescent Current VOUT IOUT PSRR CMRR VIL VIH IIL IIH IQ VEN = 0 VEN = 5V VIN = 0, VEN = 5V VIN = 0, VEN = 0 2 2.2 2.6 41 3.5 10 10 55 5.5 VCM VDIFF VOS TCVOS IB IOS RIN AV -2.9V VIN +2.9V -2.9V VCM +2.9V -3V VOUT +3V -3V VOUT +3V, RL = 100 RL = 100 RL = 100 RL = 50 RL = 30 VS = 4.5V to 5.5V -2.9V VCM +2.9V 3.4 3.3 90 53 40 MAX4444 MAX4445 MAX4444 MAX4445 SYMBOL CONDITIONS Guaranteed by PSRR test Guaranteed by CMRR test Guaranteed by output swing test MIN 4.5 -2.9 -1.7 15 12 10 55 TYP MAX 5.5 2.9 1.7 65 UNITS V V V mV V/C A A k V/V % %/C V mA dB dB k 0.8 V V A A mA
0.25 45 82 170 2 (1 + 600/RG) 0.5 2 2.6 0.003 3.7 3.6 120 70 55 1.8 8
ROUT(OFF) VEN = 0, -3.5V VOUT +3.5V, MAX4444
2
_______________________________________________________________________________________
Ultra-High Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, VEN = 5V, RL = 100, REF = GND, AVCL = +2V/V, TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth 0.1dB Gain Flatness SYMBOL BWSS BWLS VOUT = 2Vp-p VOUT = 100mVp-p VOUT = 4V step Slew Rate (Note 1) SR VOUT = 2V step VOUT = 1V step VOUT = 0.5V step Rise Time (Note 1) tRISE VOUT = 4V step Fall Time (Note 1) tFALL VOUT = 2V step VOUT = 1V step VOUT = 0.5V step Settling Time Settle to 0.1% , VOUT = 2V step fC = 100kHz SFDR VOUT = 2Vp-p fC = 5MHz fC = 20MHz fC = 100MHz fC = 100kHz 2nd-Harmonic Distortion VOUT = 2Vp-p fC = 5MHz fC = 20MHz fC = 100MHz fC = 100kHz 3rd-Harmonic Distortion VOUT = 2Vp-p fC = 5MHz fC = 20MHz fC = 100MHz Differential Phase Error Differential Gain Error Input Noise Voltage Density Input Noise Current Density Output Impedance Enable Time Disable Time Power-Up Time Power-Down Time DP DG eN iN ZOUT tSHDN(ON) tSHDN(OFF) tON tOFF NTSC, RL = 150 NTSC, RL = 150 f = 100kHz (Note 2) f = 100kHz f = 10MHz VIN = 1V, VOUT settle to within 10% VIN = 1V, VOUT settle to within 10% VIN = 1V, VOUT settle to within 10% VIN = 1V, VOUT settle to within 10% MAX4444 MAX4445 MAX4444 MAX4445 CONDITION VOUT = 100mVp-p MIN TYP 550 500 80 5000 3800 2400 2000 1200 600 650 825 700 700 700 12 -65 -60 -55 -35 -65 -62 -50 -35 -90 -72 -62 -55 0.05 0.07 25 1.8 0.7 80 200 0.5 0.3 degrees % nV/Hz pA/Hz ns ns s s dBc dBc dBc ns ps ps V/s V/s MAX UNITS MHz MHz MHz
MAX4444/MAX4445
Note 1: Input step voltage has <100ps rise (fall) time. Measured at the output from 10% to 90% (90% to 10%) level. Note 2: Includes the current noise contribution through the on-die feedback resistor.
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3
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable MAX4444/MAX4445
Typical Operating Characteristics
(VCC = +5V, VEE = -5V, VEN = 5V, VIN = VIN+ - VIN-, RL = 100, REF = GND, AV = +2V/V, TA = +25C, unless otherwise noted.)
MAX4444 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc01
MAX4445 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc02
MAX4444 GAIN FLATNESS vs. FREQUENCY
0.8 0.7 0.6 GAIN (dB) 0.5 0.4 0.3 0.2 0.1 VOUT = 100mVp-p
MAX4444toc03
5 4 3 2 GAIN (dB)
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4
0.9
1 0 -1 -2 -3 -4 -5 100k 1M 10M FREQUENCY (Hz) 100M 1G VOUT = 100mVp-p
-5 -6 100k
VOUT = 100mVp-p 1M 10M FREQUENCY (Hz) 100M 1G
0 -0.1 100k 1M 10M FREQUENCY (Hz) 100M 1G
MAX4445 GAIN FLATNESS vs. FREQUENCY
MAX4445toc04
MAX4444 LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4444toc05
MAX4445 LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p
MAX4445toc06
0.6 0.5 0.4 0.3 GAIN (dB) VOUT = 100mVp-p
5 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 VOUT = 2Vp-p
4
0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
MAX4444 SMALL-SIGNAL PULSE RESPONSE
MAX4444toc07
MAX4445 SMALL-SIGNAL PULSE RESPONSE
MAX4445toc08
MAX4444 LARGE-SIGNAL PULSE RESPONSE
MAX4444toc09
INPUT 25mV/div
INPUT 25mV/div
INPUT 250mV/div
OUTPUT 50mV/div
OUTPUT 50mV/div
OUTPUT 500mV/div
5ns/div
5ns/div
5ns/div
4
_______________________________________________________________________________________
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VEN = 5V, VIN = VIN+ - VIN-, RL = 100, REF = GND, AV = +2V/V, TA = +25C, unless otherwise noted.)
MAX4445 LARGE-SIGNAL PULSE RESPONSE
MAX4445toc10
MAX4444/MAX4445
SLEW RATE vs. OUTPUT VOLTAGE SWING
MAX4444/45toc11
MAX4444 DIFFERENTIAL GAIN AND PHASE
0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 0 IRE 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 0 IRE 100 PHASE (degrees) GAIN (%)
MAX4444toc12
6000 5000 SLEW RATE (V/s) 4000 3000 2000 MAX4445 1000 0 MAX4444
INPUT 250mV/div
100
OUTPUT 500mV/div
5ns/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 OUTPUT VOLTAGE SWING (Vp-p)
MAX4444 HARMONIC DISTORTION vs. FREQUENCY
MAX4444toc13
MAX4445 HARMONIC DISTORTION vs. FREQUENCY
MAX4445toc14
MAX4444 HARMONIC DISTORTION vs. LOAD RESISTANCE
-10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 2nd HARMONIC 3rd HARMONIC fC = 5MHz, VOUT = 2Vp-p
MAX4444toc15
0 -10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 500k 1M 10M FREQUENCY (Hz) 3rd HARMONIC 2nd HARMONIC VOUT = 2Vp-p
0 -10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 3rd HARMONIC 2nd HARMONIC VOUT = 2Vp-p
0
-80 -90 -100
100M
500k
1M
10M FREQUENCY (Hz)
100M
100
1k LOAD RESISTANCE ()
10k
MAX4445 HARMONIC DISTORTION vs. LOAD RESISTANCE
MAX4444toc16
MAX4444 HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
MAX4444toc17
MAX4445 HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING
-10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 2nd HARMONIC 3rd HARMONIC fC = 5MHz
MAX4445toc18
0 -10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 100 1k LOAD RESISTANCE () 3rd HARMONIC 2nd HARMONIC fC = 5MHz, VOUT = 2Vp-p
0 -10 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 3rd HARMONIC 2nd HARMONIC fC = 5MHz
0
10k
0.5
1.5
2.5
3.5
4.5
5.5
6.5
0.5
1.5
2.5
3.5
4.5
5.5
6.5
OUTPUT VOLTAGE SWING (Vp-p)
OUTPUT VOLTAGE SWING (Vp-p)
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5
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable MAX4444/MAX4445
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VEN = 5V, VIN = VIN+ - VIN-, RL = 100, REF = GND, AV = +2V/V, TA = +25C, unless otherwise noted.)
VOLTAGE SWING vs. LOAD RESISTANCE
MAX4444/45toc20
INPUT VOLTAGE NOISE DENSITY vs. FREQUENCY
MAX4444/45toc21
INPUT CURRENT NOISE DENSITY vs. FREQUENCY
MAX4444/45toc22
3.90 3.85 OUTPUT VOLTAGE (V) 3.80 MAX4444 3.75 3.70 3.65 3.60 0 400 800 1200 1600
1000
100
VOLTAGE NOISE (nV/Hz)
100
CURRENT NOISE (pA/Hz)
MAX4445
10
10 2000 1 10 100 LOAD RESISTANCE () 10k 100k 1k FREQUENCY (Hz) 1M 10M
1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4444/45toc23
COMMON-MODE REJECTION vs. FREQUENCY
MAX4444/45toc24
MAX4444 CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY
MAX4444toc25
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 100k 1M 10M FREQUENCY (Hz) 100M
0 -10 -20 CMR (dB) -30 -40 -50 -60
1000
100
ZOUT () 100k 1M 10M FREQUENCY (Hz) 100M 1G
10
1
-0.1 -70 -80 1G -0.01 100k 1M 10M FREQUENCY (Hz) 100M 1G
SHUTDOWN RESPONSE
MAX4444/45toc26
MAX4444 RECOMMENDED ISOLATION RESISTANCE vs. CAPACITIVE LOAD
MAX4444toc27
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4444/45toc28
24 22 20 RISO () 18 16 14 12
0
INPUT OFFSET VOLTAGE (mV)
SHUTDOWN PULSE 2.5V/div
-5
-10
OUTPUT 1V/div
-15
-20 8 10 12 14 16 18 20 22 24 -40 -15 10 35 60 85 CAPACITIVE LOAD (pF) TEMPERATURE (C)
200ns/div
6
_______________________________________________________________________________________
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VEN = 5V, VIN = VIN+ - VIN-, RL = 100, REF = GND, AV = +2V/V, TA = +25C, unless otherwise noted.)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4444/45toc29
MAX4444/MAX4445
QUIESCENT CURRENT vs. TEMPERATURE
44 QUIESCENT CURRENT (mA) 43 42 41 40 39 38 37 36 EN = 5V
MAX4444/45toc30
QUIESCENT CURRENT vs. TEMPERATURE
EN = GND QUIESCENT CURRENT (mA) 4
MAX4444/45toc31
12 10 INPUT BIAS CURRENT (A) 8 6 4 2 0 -40 -25 -10 5 20 35 50 65
45
5
3
2
1
35 80 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
Pin Description
PIN NAME MAX4444 1, 2 3 4, 5 -- 6 7, 8, 11-14 9 10 15 16 MAX4445 1, 2 3 -- 4, 5 6 7, 8, 11-14 9 10 15 16 VCC INN.C. RG IN+ VEE EN REF OUT GND Positive Power-Supply Input. Bypass with a 0.1F capacitor to GND. Inverting Amplifier Input No Connection. Not internally connected. Connect to GND for best AC performance. Resistor Gain Input. Connect a resistor between these pins to set closed-loop gain (Figure 1). Noninverting Amplifier Input Negative Supply Input. Bypass with a 0.1F capacitor. Active-High Enable Input. Connect to VCC for normal operation. Connect to GND for disable mode. Reference Input. Connect to midpoint of the two power supplies. Amplifier Output Ground FUNCTION
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7
Ultra-High-Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable MAX4444/MAX4445
RG RGAIN IN+ RISO
MAX4445 MAX4444 MAX4445
RG
GAIN = 1 + 600 RGAIN
IN-
CLOAD
Figure 1. Setting the Amplifier Gain
Figure 2. Using an Isolation Resistor for High Capacitive Loads
_______________Detailed Description
The MAX4444/MAX4445 differential-to-single-ended line receivers offer high-speed and low-distortion performance, and are ideally suited for video and RF signal-processing applications. These receivers offer a small-signal bandwidth of 550MHz and have a high slew rate of up to 5000V/s. Their 120mA output capability allows them to be directly coupled to data acquisition systems.
Setting Gain (MAX4445)
The MAX4445 is stable with a minimum gain configuration of +2V/V. RGAIN, connected between the RG pins, sets the gain of this device as shown in Figure 1. Calculate the expected gain as follows: Gain = (1 + 600 / RGAIN)
Driving Capacitive Loads
The MAX4444/MAX4445 are designed to drive capacitive loads. However, excessive capacitive loads may cause ringing or instability at the output as the phase margin of the device reduces. Adding a small series isolation resistor at the output helps reduce the ringing but slightly increases gain error (Figure 2). For recommended values, see Typical Operating Characteristics.
__________Applications Information
Grounding Bypassing
Use the following high-frequency design techniques when designing the PC board for the MAX4444/ MAX4445. * Use a multilayer board with one layer dedicated as the ground plane. * Do not use wire wrap or breadboards due to high inductance. * Avoid IC sockets due to high parasitic capacitance and inductance. * Bypass supplies with a 0.1F capacitor. Use surface-mount capacitors to minimize lead inductance. * Keep signal lines as short and straight as possible. Do not make 90 turns. Use rounded corners. Do not cross signal paths if possible. * Ensure that the ground plane is free from voids.
Coaxial Line Driver
The MAX4444/MAX4445 are well suited to drive coaxial cables. Their high output current capability can easily drive the 75 characteristic impedance of common coaxial cables. Adjust the gain of the MAX4445 to compensate for cable losses to maintain the required levels at the input of the next stage.
Chip Information
TRANSISTOR COUNT: 254 SUBSTRATE CONNECTED TO VEE
Low-Power Enable Mode
The MAX4444/MAX4445 are disabled when EN goes low. This reduces supply current to only 3.5mA. As the output becomes higher impedance, the effective impedance at the output for the MAX4444 is 1.8k. The effective output impedance for the MAX4445 is 1.8k plus RGAIN.
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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