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EL5175, EL5375
Data Sheet February 11, 2005 FN7306.5
550MHz Differential Line Receivers
The EL5175 and EL5375 are single and triple high bandwidth amplifiers designed to extract the difference signal from noisy environments. They are primarily targeted for applications such as receiving signals from twisted-pair lines or any application where common mode noise injection is likely to occur. The EL5175 and EL5375 are stable for a gain of one and requires two external resistors to set the voltage gain for each channel. The output common mode level is set by the reference pin (VREF), which has a -3dB bandwidth of over 450MHz. Generally, this pin is grounded but it can be tied to any voltage reference. The output can deliver a maximum of 60mA and is short circuit protected to withstand a temporary overload condition. The EL5175 is available in the 8-pin SO and 8-pin MSOP packages and the EL5375 in the 24-pin QSOP package. All are specified for operation over the full -40C to +85C temperature range.
Features
* Differential input range 2.3V * 550MHz 3dB bandwidth * 900V/s slew rate * 60mA maximum output current * Single 5V or dual 5V supplies * Low power - 9.6mA per channel * Pb-free available (RoHS compliant)
Applications
* Twisted-pair receivers * Differential line receivers * VGA over twisted-pair * ADSL/HDSL receivers * Differential to single-ended amplification * Reception of analog signals in a noisy environment
Pinouts
EL5175 (8-PIN SO, MSOP) TOP VIEW
FB 1 IN+ 2 IN- 3 REF 4 + 8 OUT 7 VS6 VS+ 5 EN REF1 1 INP1 2 INN1 3 NC 4 REF2 5 INP2 6 INN2 7 NC 8 REF3 9 INP3 10 INN3 11 NC 12 + + + -
EL5375 (24-PIN QSOP) TOP VIEW
24 NC 23 FB1 22 OUT1 21 NC 20 VSP 19 VSN 18 NC 17 FB2 16 OUT2 15 EN 14 FB3 13 OUT3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2004, 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
EL5175, EL5375 Ordering Information
PART NUMBER EL5175IS EL5175IS-T7 EL5175IS-T13 EL5175ISZ (See Note 1) EL5175ISZ-T7 (See Note 1) EL5175ISZ-T13 (See Note 1) EL5175IY EL5175IY-T7 EL5175IY-T13 EL5175IYZ (See Note 1) EL5175IYZ-T7 (See Note 1) EL5175IYZ-T13 (See Note 1) EL5375IU EL5375IU-T7 EL5375IU-T13 EL5375IUZ (See Note 1, 2) EL5375IUZ-T7 (See Note 1, 2) EL5375IUZ-T13 (See Note 1, 2) NOTES: 1. Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 2. Coming soon PACKAGE 8-Pin SO 8-Pin SO 8-Pin SO 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP (Pb-free) 8-Pin MSOP (Pb-free) 8-Pin MSOP (Pb-free) 24-Pin QSOP 24-Pin QSOP 24-Pin QSOP 24-Pin QSOP (Pb-free) 24-Pin QSOP (Pb-free) 24-Pin QSOP (Pb-free) TAPE & REEL 7" 13" 7" 13" 7" 13" 7" 13" 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0043 MDP0043 MDP0043 MDP0043 MDP0043 MDP0043 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040
2
FN7306.5
EL5175, EL5375
Absolute Maximum Ratings (TA = 25C)
Supply Voltage (VS+ to VS-) . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V Maximum Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135C Ambient Operating Temperature . . . . . . . . . . . . . . . .-40C to +85C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications PARAMETER AC PERFORMANCE BW -3dB Bandwidth
VS+ = +5V, VS- = -5V, TA = 25C, VIN = 0V, RL = 500, RF = 0, RG = OPEN, CL = 2.7pF, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT
AV =1, CL = 2.7pF AV =2, RF = 806, CL = 2.7pF AV =10, RF = 806, CL = 2.7pF
550 190 20 60 600 900 10 20 200
MHz MHz MHz MHz V/s V/s ns ns MHz MHz V/s nV/Hz pA/Hz dBc dBc dBc dBc % dB
BW SR
0.1dB Bandwidth Slew Rate
AV =1, CL = 2.7pF VOUT = 3VP-P, 20% to 80%, RL = 100 VOUT = 3VP-P, 20% to 80%, RL = 500
TSTL TOVR GBWP
Settling Time to 0.1% Output Overdrive Recovery time Gain Bandwidth Product
VOUT = 2VP-P
VREFBW (-3dB) VREF -3dB Bandwidth VREFSR VN IN HD2 HD2 HD3 HD3 dG d eS VREF Slew Rate Input Voltage Noise Input Current Noise Second Harmonic Distortion Second Harmonic Distortion Third Harmonic Distortion Third Harmonic Distortion Differential Gain at 3.58MHz Differential Phase at 3.58MHz Channel Separation (EL5375)
AV =1, CL = 2.7pF VOUT = 2VP-P, 20% to 80% at f = 10kHz at f = 10kHz VOUT = 1VP-P, 5MHz VOUT = 1VP-P, 5MHz VOUT = 1VP-P, 5MHz VOUT = 1VP-P, 5MHz RL = 150 , AV =2 RL = 150 , AV =2 at f = 100kHz
450 1000 21 2.7 -70 -66 -94 -84 0.1 0.1 90
INPUT CHARACTERISTICS VOS Input Referred Offset Voltage EL5175 EL5375 IIN RIN CIN DMIR CMIR VREFIN CMRR Input Bias Current (VIN, VINB, VREF) Differential Input Resistance Differential Input Capacitance Differential Mode Input Range Common Mode Input Range at VIN+, VINReference Input Voltage Range Input Common Mode Rejection Ratio VIN+ = VIN- = 0V VIN = 2.5V 2.1 -4.3 -3.6 75 95 -25 -3 -3 -12.5 150 1 2.3 2.5 +3.3 3.3 40 30 -6 mV mV A k pF V V V dB
3
FN7306.5
EL5175, EL5375
Electrical Specifications PARAMETER Gain VS+ = +5V, VS- = -5V, TA = 25C, VIN = 0V, RL = 500, RF = 0, RG = OPEN, CL = 2.7pF, unless otherwise specified. (Continued) DESCRIPTION Gain Accuracy CONDITIONS EL5175, VIN = 1V EL5375, VIN = 1V OUTPUT CHARACTERISTICS VOUT Positive Output Voltage Swing Negative Output Voltage Swing IOUT(Max) ROUT SUPPLY VSUPPLY IS (on) IS (off)+ Supply Operating Range Power Supply Current Per Channel Enabled Positive Power Supply Current - Disabled EN pin tied to 4.8V, EL5175 EN pin tied to 4.8V, EL5375 IS (off)PSRR ENABLE tEN tDS VIH VIL IIH-EN IIL-EN Enable Time Disable Time EN Pin Voltage for Power-up EN Pin Voltage for Shut-down EN Pin Input Current High Per Channel EN Pin Input Current Low Per Channel At VEN = 5V At VEN = 0V -10 VS+ -0.5 40 -3 60 80 1.2 VS+ -1.5 ns s V V A A Negative Power Supply Current Disabled Power Supply Rejection Ratio VS from 4.5V to 5.5V -150 45 VS+ to VS4.75 8 9.6 80 1.7 -120 56 11 11 100 5 -90 V mA A A A dB Maximum Output Current Output Impedance RL = 500 to GND RL = 500 to GND RL = 10 40 3.3 3.54 -3.95 67 130 -3.6 V V mA m MIN 0.979 0.977 TYP 0.994 0.992 MAX 1.009 1.007 UNIT V V
4
FN7306.5
EL5175, EL5375 Pin Descriptions
EL5175 1 2 3 4 5 6 7 8 1, 5, 9 2, 6, 10 3, 7, 11 4, 8, 12, 18, 21, 24 13, 16, 22 14, 17, 23 15 19 20 EL5375 PIN NAME FB IN+ INREF EN VS+ VSOUT REF1, 2, 3 INP1, 2, 3 INN1, 2, 3 NC OUT1, 2, 3 FB1, 2, 3 EN VSN VSP Feedback input Non-inverting input Inverting input Sets the common mode output voltage level to VREF Enabled when this pin is floating or the applied voltage VS+ - 1.5 Positive supply voltage Negative supply voltage Output voltage Reference input, controls common-mode output voltage Non-inverting inputs Inverting inputs No connect, grounded for best crosstalk performance Non-inverting outputs Feedback from outputs Enabled when this pin is floating or the applied voltage VS+ - 1.5 Negative supply Positive supply PIN FUNCTION
5
FN7306.5
Connection Diagrams
RG RF=0
-5V OUT 8 VSN 7 VSP 6 EN 5 +5V EN CL 2.7pF VOUT RL 500
1 FB INP INN 2 INP 3 INN 4 REF RS2 50 RS2 50 RS3 50
6
REF EL5175 RG REF1 INP1 INN1 1 REF1 2 INP1 3 INN1 4 NC REF2 INP2 INN2 5 REF2 6 INP2 7 INN2 8 NC REF3 INP3 INN3 RSP1 50 RSN1 50 RSR1 50 RSP2 50 RSN2 50 RSR2 50 RSP3 50 RSN3 50 RSR3 50 9 REF3 10 INP3 11 INN3 12 NC NC 24 FB1 23 OUT1 22 NC 21 VSP 20 VSN 19 NC 18 FB2 17 OUT2 16 EN 15 FB3 14 OUT3 13 EL5175 -5V CL2 2.7pF CL3 2.7pF RL3 500 OUT3 RG RF RL2 500 OUT2 RG RF CL1 2.7pF OUT1 RL1 500 +5V
EL5175, EL5375
RF
ENABLE
FN7306.5
EL5175, EL5375 Typical Performance Curves
4 AV=1 RL=500 2 CL=2.7pF MAGNITUDE (dB) VS=5V 0 VS=2.5V -2 MAGNITUDE (dB) 4 AV=1 RL=100 2 CL=2.7pF
0 VS=5V -2 VS=2.5V
-4
-4
-6 1M
10M
100M
1G
-6 1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 1. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
4
FIGURE 2. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
5
NORMALIZED GAIN (dB)
VS=5V RL=500 2 CL=2.7pF AV=1 0 AV=5 -2 AV=10 AV=2 -4 MAGNITUDE (dB)
VS=5V RL=500 3 AV=1
CL=15pF CL=10pF
1
-1
CL=2.7pF CL=0pF
-3
-6 1M
10M
100M
1G
-5 1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 3. FREQUENCY RESPONSE vs VARIOUS GAIN
FIGURE 4. FREQUENCY RESPONSE vs CL
5
NORMALIZED GAIN (dB)
VS=2.5V RL=500 3 AV=1 MAGNITUDE (dB)
4 CL=15pF
CL=10pF 1
VS=5V RL=500 2 AV=2 CL=2.7pF 0
RF=1k
RF=806 RF=500
-1
CL=2.7pF CL=0pF
-2
RF=200
-3
-4
-5 1M
10M
100M
1G
-6 1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 5. FREQUENCY RESPONSE vs CL
FIGURE 6. FREQUENCY RESPONSE FOR VARIOUS RF
7
FN7306.5
EL5175, EL5375 Typical Performance Curves
4 RL=500 AV=1 2 CL=2.7pF GAIN (dB)
(Continued)
60 90
NORMALIZED GAIN (dB)
40
0 PHASE ()
0
VS=5V VS=2.5V
20
-90
-2
0
-180
-4
-20
-270
-6 1M
10M
100M
1G
-40 10K
100K
1M
10M
100M
-360 1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 7. FREQUENCY RESPONSE FOR VREF
100 30 10 IMPEDANCE () 10 -10 -30 -50 -70 0.1 10K -90 10K
FIGURE 8. OPEN LOOP GAIN
PSRR (dB)
1
PSRR+ PSRR-
100K
1M FREQUENCY (Hz)
10M
100M
100K
1M FREQUENCY (Hz)
10M
100M
FIGURE 9. OUTPUT IMPEDANCE vs FREQUENCY
120 VOLTAGE NOISE (nV/Hz), CURRENT NOISE (pA/Hz) 100 80 60 40 20 -90 1K 1K
FIGURE 10. PSRR vs FREQUENCY
CMRR (dB)
100 EN 10 IN 1 10
10K
100K
1M
10M
100M
1G
100
1K
10K
100K
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 11. CMRR vs FREQUENCY
FIGURE 12. VOLTAGE AND CURRENT NOISE vs FREQUENCY
8
FN7306.5
EL5175, EL5375 Typical Performance Curves
0
(Continued)
-40
-20 DISTORTION (dB) GAIN (dB)
VS=5V f=5MHz -50 R =500 L -60 -70 -80 -90 -100
H ( D3 =1 AV
2) (AV= HD2
-40 CH1CH2, CH2CH3 CH1CH3 -80
=1) HD2 (AV =2) HD3 (AV
)
-60
-100 100K
1M
10M FREQUENCY (Hz)
100M
1G
1
2
3
4 VOP-P (V)
5
6
7
FIGURE 13. CHANNEL ISOLATION vs FREQUENCY (EL5375 ONLY)
-50
FIGURE 14. HARMONIC DISTORTION vs OUTPUT VOLTAGE
-50
2 HD =2) (AV
-60 DISTORTION (dB)
-70
HD2 (AV=1)
DISTORTION (dB)
HD2 (AV=2)
-60
=1) HD2 (AV
-70
3 HD
=2) (AV
=1) 3 (AV
-80
H D3
(AV = 2)
-80
HD
VS=5V -90 f=5MHz HD3 (AV=1) VOP-P=1V (AV=1) VOP-P=2V (AV=2) -100 100 200 300 400 500 600 700 800 900 RLOAD ()
-90
1K
-100
VS=5V RL=500 VOP-P=1V (AV=1) VOP-P=2V (AV=2) 20 25 30 35 40
0
5
10
15
RLOAD ()
FIGURE 15. HARMONIC DISTORTION vs LOAD RESISTANCE
FIGURE 16. HARMONIC DISTORTION vs FREQUENCY
50mV/DIV
0.5V/DIV
10ns/DIV
10ns/DIV
FIGURE 17. SMALL SIGNAL TRANSIENT RESPONSE
FIGURE 18. LARGE SIGNAL TRANSIENT RESPONSE
9
FN7306.5
EL5175, EL5375 Typical Performance Curves
M=100ns CH1=200mV/DIV CH2=5V/DIV CH1 CH1
(Continued)
M=400ns CH1=200mV/DIV CH2=5V/DIV
CH2 CH2
100ns/DIV
400ns/DIV
FIGURE 19. ENABLED RESPONSE
FIGURE 20. DISABLED RESPONSE
1.2 POWER DISSIPATION (W) 1 0.8
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
1.4 POWER DISSIPATION (W)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
1.2 1.136W 1 909mW 0.8 870mW 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 MSOP8 JA=115C/W QSOP24 JA=88C/W SO8 JA=110C/W
870mW QSOP24 JA=115C/W SO8 JA=160C/W
625mW 0.6 0.4 486mW 0.2 0
MSOP8 JA=206C/W
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
FIGURE 21. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Simplified Schematic
VS+ I1 I2 RD1 I3 I4 RD2 R3 R4
VIN+ Q1
VINQ2
VREF Q3
FB Q4
Q7
Q8
VB1
Q9 x1 25 Q6 VB2 CC R1 R2 VSVOUT
10
FN7306.5
EL5175, EL5375 Description of Operation and Application Information
Product Description
The EL5175 and EL5375 are wide bandwidth, low power and single/differential ended to single ended output amplifiers. The EL5175 is a single channel differential to single ended amplifier. The EL5375 is a triple channel differential to single ended amplifier. The EL5175 and EL5375 are internally compensated for closed loop gain of +1 of greater. Connected in gain of 1 and driving a 500 load, the EL5175 and EL5375 have a -3dB bandwidth of 550MHz. Driving a 150 load at gain of 2, the bandwidth is about 130MHz. The bandwidth at the REF input is about 450MHz. The EL5175 and EL5375 is available with a power down feature to reduce the power while the amplifier is disabled.
Choice of Feedback Resistor and Gain Bandwidth Product
For applications that require a gain of +1, no feedback resistor is required. Just short the OUT+ pin to FBP pin and OUT- pin to FBN pin. For gains greater than +1, the feedback resistor forms a pole with the parasitic capacitance at the inverting input. As this pole becomes smaller, the amplifier's phase margin is reduced. This causes ringing in the time domain and peaking in the frequency domain. Therefore, RF has some maximum value that should not be exceeded for optimum performance. If a large value of RF must be used, a small capacitor in the few Pico farad range in parallel with RF can help to reduce the ringing and peaking at the expense of reducing the bandwidth. The bandwidth of the EL5175 and EL5375 depends on the load and the feedback network. RF and RG appear in parallel with the load for gains other than +1. As this combination gets smaller, the bandwidth falls off. Consequently, RF also has a minimum value that should not be exceeded for optimum bandwidth performance. For gain of +1, RF = 0 is optimum. For the gains other than +1, optimum response is obtained with RF between 500 to 1k. For AV = 2 and RF = RG = 806, the BW is about 190MHz and the frequency response is very flat. The EL5175 and EL5375 have a gain bandwidth product of 200MHz. For gains 5, its bandwidth can be predicted by the following equation:
Gain x BW = 200MHz
Input, Output, and Supply Voltage Range
The EL5175 and EL5375 have been designed to operate with a single supply voltage of 5V to 10V or a split supplies with its total voltage from 5V to 10V. The amplifiers have an input common mode voltage range from -4.3V to 3.3V for 5V supply. The differential mode input range (DMIR) between the two inputs is about from -2.3V to +2.3V. The input voltage range at the REF pin is from -3.6V to 3.3V. If the input common mode or differential mode signal is outside the above-specified ranges, it will cause the output signal distorted. The output of the EL5175 and EL5375 can swing from -3.9V to 3.5V at 500 load at 5V supply. As the load resistance becomes lower, the output swing is reduced respectively.
Driving Capacitive Loads and Cables
The EL5175 and EL5375 can drive 15pF capacitance in parallel with 500 load to ground with less than 4.5dB of peaking at gain of +1. If less peaking is desired in applications, a small series resistor (usually between 5 to 50) can be placed in series with each output to eliminate most peaking. However, this will reduce the gain slightly. If the gain setting is greater than 1, the gain resistor RG can then be chosen to make up for any gain loss which may be created by the additional series resistor at the output. When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, a back-termination series resistor at the amplifier's output will isolate the amplifier from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. Again, a small series resistor at the output can help to reduce peaking.
Over All Gain Settings
The gain setting for the EL5175 and EL5375 is similar to the conventional operational amplifier. The output voltage is equal to the difference of the inputs plus VREF and then times the gain.
RF V O = ( V IN + - V IN - + V REF ) x 1 + ------- R G
EN VIN+ VIN+ VREF FB + RF RG G/B VO
Disable/Power-Down
The EL5175 and EL5375 can be disabled and placed its outputs in a high impedance state. The turn off time is about 1.2s and the turn on time is about 80ns. When disabled, the amplifier's supply current is reduced to 80A for IS+ and
FN7306.5
FIGURE 23.
11
EL5175, EL5375
120A for IS- typically, thereby effectively eliminating the power consumption. The amplifier's power down can be controlled by standard CMOS signal levels at the ENABLE pin. The applied logic signal is relative to VS+ pin. Letting the EN pin float or applying a signal that is less than 1.5V below VS+ will enable the amplifier. The amplifier will be disabled when the signal at EN pin is above VS+ - 0.5V. If a TTL signal is used to control the enabled/disabled function, Figure 22 could be used to convert the TTL signal to CMOS signal.
5V 10K 1K CMOS/TTL EN
For sourcing:
V OUT PD MAX = V S x I SMAX + ( V S + - V OUT ) x ------------------- x i R
LOAD
For sinking:
PD MAX = [ V S x I SMAX + ( V OUT - V S - ) x I LOAD ] x i
Where: * VS = Total supply voltage * ISMAX = Maximum quiescent supply current per channel * VOUT = Maximum output voltage of the application * RLOAD = Load resistance * ILOAD = Load current * i = Number of channels By setting the two PDMAX equations equal to each other, we can solve the output current and RLOAD to avoid the device overheat.
FIGURE 24.
Output Drive Capability
The EL5175 and EL5375 have internal short circuit protection. Its typical short circuit current is 67mA. If the output is shorted indefinitely, the power dissipation could easily increase such that the part will be destroyed. Maximum reliability is maintained if the output current never exceeds 60mA. This limit is set by the design of the internal metal interconnections.
Power Supply Bypassing and Printed Circuit Board Layout
As with any high frequency device, a good printed circuit board layout is necessary for optimum performance. Lead lengths should be as sort as possible. The power supply pin must be well bypassed to reduce the risk of oscillation. For normal single supply operation, where the VS- pin is connected to the ground plane, a single 4.7F tantalum capacitor in parallel with a 0.1F ceramic capacitor from VS+ to GND will suffice. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. In this case, the VS- pin becomes the negative supply rail. For good AC performance, parasitic capacitance should be kept to minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets should also be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance. Minimizing parasitic capacitance at the amplifier's inverting input pin is very important. The feedback resistor should be placed very close to the inverting input pin. Strip line design techniques are recommended for the signal traces.
Power Dissipation
With the high output drive capability of the EL5175 and EL5375. It is possible to exceed the 135C absolute maximum junction temperature under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for the application to determine if the load conditions or package types need to be modified for the amplifier to remain in the safe operating area. The maximum power dissipation allowed in a package is determined according to:
T JMAX - T AMAX PD MAX = ------------------------------------------- JA
* TJMAX = Maximum junction temperature * TAMAX = Maximum ambient temperature * JA = Thermal resistance of the package Assume the REF pin is tired to GND for VS = 5V application, the maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus the power in the IC due to the load, or:
12
FN7306.5
EL5175, EL5375
Typical Applications
0
50 50 EL5173/ EL5373
VFB VIN VINB VREF EL5175/ EL5375
50 ZO = 100 50
VOUT
FIGURE 25. TWISTED PAIR CABLE RECEIVER
As the signal is transmitted through a cable, the high frequency signal will be attenuated. One way to compensate this loss is to boost the high frequency gain at the receiver side.
R3 C1
R1
R2
Gain (dB) 1 + R2 / R 1
50
VFB VIN VINB VREF EL5175/ EL5375
VOUT 1 + R2 / (R1 + R3) fA fC f
ZO = 100
50
FIGURE 26. COMPENSATED LINE RECEIVER
Level Shifter and Signal Summer
The EL5175 and EL5375 contains two pairs of differential pair input stages. It makes the inputs are all high impedance inputs. To take advantage of the two high impedance inputs, the EL5175 and EL5375 can be used as a signal summer to add two signals together. Like, one signal can be applied to VIN+, the second signal can be applied to REF and VIN- is ground. The output is equal to:
V O = ( V IN + + V REF ) x Gain
Also, the EL5175 and EL5375 can be used as a level shifter by applying a level control signal to the REF input.
13
FN7306.5
EL5175, EL5375 SO Package Outline Drawing
14
FN7306.5
EL5175, EL5375 MSOP Package Outline Drawing
15
FN7306.5
EL5175, EL5375 QSOP Package Outline Drawing
NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at http://www.intersil.com/design/packages/index.asp
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 16
FN7306.5

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