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U C T M EN T ROD E TE P EPLAC nter at E SO L D ED R t Ce m/tsc OB N pp or MME nical Su tersil.co ECO ech .in January 1996, Rev. D NO R DataTSheet www ur r act o ERSIL o o nt I N T c 81-88
EL4430, EL4431
FN7167
Video Instrumentation Amplifiers
The EL4430 and EL4431 are video instrumentation amplifiers which are ideal for line receivers, differential-tosingle-ended converters, transducer interfacing, and any situation where a differential signal must be extracted from a background of common-mode noise or DC offset. These devices have two differential signal inputs and two differential feedback terminals. The FB terminal connects to the amplifier output, or a divided version of it to increase circuit gain, and the REF terminal is connected to the output ground or offset reference. The EL4430 is compensated to be stable at a gain of 1 or more, and the EL4431 for a gain of 2 or more. The amplifiers have an operational temperature of -40C to +85C and are packaged in plastic 8-pin DIP and SO-8. The EL4430 and EL4431 are fabricated with Elantec's proprietary complementary bipolar process which gives excellent signal symmetry and is free from latchup.
Features
* Fully differential inputs and feedback * Differential input range of 2V * Common-mode range of 12V * High CMRR at 4MHz of 70dB * Stable at gains of 1, 2 * Calibrated and clean input clipping * EL4430--80MHz @ G = 1 * EL4431--160MHz GBWP * 380V/s slew rate * 0.02% or differential gain or phase * Operates on 5 to 15V supplies with no AC degradation
Applications
* Line receivers * "Loop-through" interface * Level translation * Magnetic head pre-amplification * Differential-to-single-ended conversion
Pinout
EL4430, EL4431 (8-PIN PDIP, SO) TOP VIEW
Ordering Information
PART NUMBER EL4430CN EL4430CS EL4431CN EL4431CS TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PACKAGE 8-Pin PDIP 8-Pin SO 8-Pin PDIP 8-Pin SO PKG. NO. MDP0031 MDP0027 MDP0031 MDP0027
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL4430, EL4431
Absolute Maximum Ratings (TA = 25C)
V+ VS VIN VIN IIN Positive Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16.5V V+ to V- Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .33V Voltage at any Input or Feedback . . . . . . . . . . . . . . . V+ to VDifference between Pairs of Inputs or Feedback. . . . . . . . .6V Current into any Input, or Feedback Pin . . . . . . . . . . . . . 4mA IOUT PD TA TS Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . 30mA Maximum Power Dissipation . . . . . . . . . . . . . . . . See Curves Operating Temperature Range . . . . . . . . . . . .-40C to +85C Storage Temperature Range. . . . . . . . . . . . .-60C to +150C
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. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Open-Loop DC Electrical Specifications
PARAMETER VDIFF
Power supplies at 5V, TA = 25C. For the EL4431, RF = RG = 500. DESCRIPTION MIN Clipping 0.1% nonlinearity 2.0 TYP 2.3 1.8 2 12 3.0 13.0 2 12 0.2 100 70 230 90 60 -1.5 VS = 5V VS = 15V 2 12 2.5 12.5 40 -0.2 2.8 12.8 3.0 13.0 90 13.5 16 +0.5 8 20 2 MAX UNITS V V V V mV A A k dB dB % V V V V mA mA
Differential input voltage (VCM = 0)
VCM
Common-mode range (VDIFF = 0)
VS = 5V VS = 15V
VOS IB IOS RIN CMRR PSRR EG VO
Input offset voltage Input bias current (IN+, IN-, REF, and FB terminals) Input offset current between IN+ and IN- and between REF and FB Input resistance Common-mode rejection ratio Power supply rejection ratio Gain error, excluding feedback resistors Output voltage swing EL4430
Output voltage swing EL4431
VS = 5V VS = 15V
ISC IS
Output short-circuit current Supply current, VS = 15V
2
EL4430, EL4431
Closed-Loop AC Electrical Specifications
PARAMETER BW, -3dB -3dB small-signal bandwidth Power supplies at 12V, TA = 25C, RL = 500 for the EL4430, RL = 150 for the EL4431, CL = 15pF. For the EL4431, RF = RG = 500. MIN EL4430 EL4431 BW, 0.1dB 0.1dB flatness bandwidth EL4430 EL4431 Peaking Frequency response peaking EL4430 EL4431 SR VN dG Slew rate, VOUT between -2V and +2V Input-referred noise voltage density Differential gain error, Voffset between -0.7V and +0.7V Differential gain error, Voffset between -0.7V and +0.7V Settling time, to 0.1% from a 4V step EL4430 EL4431, RL = 150 EL4430 EL4431, RL = 150 EL4430 TYP 82 80 20 14 0.6 1.0 380 26 0.02 0.04 0.02 0.08 48 MAX UNITS MHz MHz MHz MHz dB dB V/s nV/Hz % % () () ns
DESCRIPTION
d
TS
Test Circuit
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EL4430, EL4431 Typical Performance Curves
EL4430 and EL4431 Common-Mode Rejection Ratio vs Frequency
EL4430 Frequency Response vs Gain
EL4430 Frequency Response for Various RL, CL VS = 5V
EL4430 Frequency Response for Various RL, CL VS = 15V
EL4431 Frequency Response vs Gain
EL4431 Frequency Response for Various RL, CL VS = 5V
EL4431 Frequency Response for Various RL, CL VS = 15V
EL4430 Differential Gain and Phase vs Input Offset Voltage for VS = 5V
EL4430 Differential Gain and Phase vs Input Offset Voltage for VS = 12V
EL4430 Differential Gain and Phase Error vs RL
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EL4430, EL4431 Typical Performance Curves
(Continued)
EL4431 Differential Gain and Phase vs Input Offset Voltage for VS = 5V
EL4431 Differential Gain and Phase vs Input Offset Voltage for VS = 12V
EL4431 Differential Gain and Phase Error vs RL
EL4430 Nonlinearity vs Input Signal Span
EL4431 Nonlinearity vs Input Signal Span
EL4430 -3dB Bandwidth and Peaking vs Supply Voltage for AV = +1
EL4430 -3dB Bandwidth and Peaking vs Die Temperature for AV = +1
EL4430 Gain, -3dB Bandwidth and Peaking vs Load Resistance for AV = +1
EL4431 -3dB Bandwidth and Peaking vs Supply Voltage
EL4431 -3dB Bandwidth and Peaking vs Die Temperature for AV = +2
EL4431 Gain, -3dB Bandwidth and Peaking vs Load Resistance for AV = +2
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EL4430, EL4431 Typical Performance Curves
Slew Rate vs Supply Voltage
(Continued)
Slew Rate vs Die Temperature
Input Voltage and Current Noise vs Frequency
Common Mode Input Range vs Supply Voltage
Offset Voltage vs Die Temperature
Bias Current vs Die Temperature
Supply Current vs Supply Voltage
Supply Current vs Die Temperature
Power Dissipation vs Ambient Temperature
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EL4430, EL4431 Applications Information
The EL4430 and EL4431 are designed to convert a fully differential input to a single-ended output. It has two sets of inputs; one which is connected to the signal and does not respond to its common-mode level, and another which is used to complete a feedback loop with the output. Here is a typical connection:
Input Connections
The input transistors can be driven from resistive and capacitive sources, but are capable of oscillation when presented with an inductive input. It takes about 80nH of series inductance to make the inputs actually oscillate, equivalent to 4 of unshielded wiring or about 6 of unterminated input transmission line. The oscillation has a characteristic frequency of 500MHz. Often, placing one's finger (via a metal probe) or an oscilloscope probe on the input will kill the oscillation. Normal high-frequency construction obviates any such problems, where the input source is reasonably close to the input. If this is not possible, one can insert series resistors of approximately 51 to de-Q the inputs.
Signal Amplitudes
The gain of the feedback divider is H. The transfer function of the part is: VOUT = AO x ((VIN+) - (VIN-) + (VREF - VFB)). VFB is connected to VOUT through a feedback network, so VFB = H x VOUT. AO is the open-loop gain of the amplifier, and is about 600 for the EL4430 and EL4431. The large value of AO drives: (VIN+) - (VIN-) + (VREF - VFB)0. Rearranging and substituting for VFB: VOUT = ((VIN+) - (VIN-) + VREF)/H. Thus, the output is equal to the difference of the VINs and offset by VREF, all gained up by the feedback divider ratio. The input impedance of the FB terminal (equal to RIN of the input terminals) is in parallel with an RG, and raises circuit gain slightly. The EL4430 is stable for a gain of 1 (a direct connection between VOUT and FB) or more and the EL4431 for gains of 2 or more. It is important to keep the feedback divider's impedance at the FB terminal low so that stray capacitance does not diminish the loop's phase margin. The pole caused by the parallel of resistors RF and RG and stray capacitance should be at least 200MHz; typical strays of 3pF thus require a feedback impedance of 270 or less. Two 510 resistors are acceptable for a gain of 2; 300 and 2700 make a good gain-of-10 divider. Alternatively, a small capacitor across RF can be used to create more of a frequencycompensated divider. The value of the capacitor should scale with the parasitic capacitance at the FB terminal input. It is also practical to place small capacitors across both the feedback resistors (whose values maintain the desired gain) to swamp out parasitics. For instance, two 10pF capacitors (for a gain of 2) across equal divider resistors will dominate parasitic effects and allow a higher divider resistance. Signal input common-mode voltage must be between (V-)+3V and (V+)-3V to ensure linearity. Additionally, the differential voltage on any input stage must be limited to 6V to prevent damage. The differential signal range is 2V in the EL4430 and EL4431. The input range is substantially constant with temperature.
The Ground Pin
The ground pin draws only 6A maximum DC current, and may be biased anywhere between (V-)+2.5V and (V+)-3.5V. The ground pin is connected to the IC's substrate and frequency compensation components. It serves as a shield within the IC and enhances CMRR over frequency, and if connected to a potential other than ground, it must be bypassed.
Power Supplies
The instrumentation amplifiers work well on any supplies from 3V to 15. The supplies may be of different voltages as long as the requirements of the Gnd pin are observed (see the Ground Pin section for a discussion). The supplies should be bypassed close to the device with short leads. 4.7F tantalum capacitors are very good, and no smaller bypasses need be placed in parallel. Capacitors as low as 0.01F can be used if small load currents flow. Single-polarity supplies, such as +12V with +5V can be used, where the ground pin is connected to +5V and V- to ground. The inputs and outputs will have to have their levels shifted above ground to accommodate the lack of negative supply. The dissipation of the amplifiers increases with power supply voltage, and this must be compatible with the package chosen. This is a close estimate for the dissipation of a circuit: PD= 2 x VS x IS, max + (VS-VO) x VO/RPAR
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EL4430, EL4431
where IS, max is the maximum supply current VS is the supply voltage (assumed equal) VO is the output voltage RPAR is the parallel of all resistors loading the output For instance, the EL4431 draws a maximum of 16mA and we might require a 2V peak output into 150 and a 270 + 270 feedback divider. The RPAR is 117. The dissipation with 5V supplies is 201mW. The maximum supply voltage that the device can run on for a given PD and the other parameter is: VS, max = (PD + VO2/RPAR)/(2IS + VO/RPAR) The maximum dissipation a package can offer is: PD, max = (TJ, max - TA max)/JA where TJ, max is the maximum die junction temperature, 150C for reliability, less to retain optimum electrical performance. TA, max is the ambient temperature, 70C for commercial and 85C for industrial range. JA is the thermal resistance of the mounted package, obtained from datasheet dissipation curves. The more difficult case is the SO-8 package. With a maximum die temperature of 150C and a maximum ambient temperature of 85C, the 65C temperature rise and package thermal resistance of 170C/W gives a dissipation of 382mW at 85C. This allows a maximum supply voltage of 8.5V for the EL4431 operated in our example. If an EL4430 were driving a light load (RPAR), it could operate on 15V supplies at a 70C maximum ambient.
Output Loading
The output stage of the instrumentation amplifiers is very powerful. It typically can source 80mA and sink 120mA. Of course, this is too much current to sustain and the part will eventually be destroyed by excessive dissipation or by metal traces on the die opening. The metal traces are completely reliable while delivering the 30mA continuous output given in the Absolute Maximum Ratings table in this datasheet, or higher purely transient currents. Gain or gain accuracy degrades only 10% from no load to 100 load. Heavy resistive loading will degrade frequency response and video distortion for loads <100. Capacitive loads will cause peaking in the frequency response. If capacitive loads must be driven, a small-valued series resistor can be used to isolate it (12 to 51 should suffice). A 22 series resistor will limit peaking to 2.5dB with even a 220pF load.
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EL4430, EL4431 EL4430,EL4431 Macromodel
*Macromodel *This is a Pspice-compatible macromodel of the EL4430 video instrumentation amplifier assembled *as a sub circuit. The pins are numbered sequentially as the subcircuit interface nodes. T1 is a *transmission line which provides a good emulation of the more complicated real device. This model *correctly displays the characteristics of input clipping, frequency response, CMRR both AC and DC, *output clipping, output sensitivity to capacitive loads, gain accuracy, slewrate limiting, input bias *current and impedance. The macromodel does not exhibit proper results with respect to supply current, *supply sensitivities, offsets, output current limit, differential gain or phase, nor temperature. *Connections: IN+ | VIN| | V| | | V+ | | | | VFB | | | || VREF | | | || | VOUT | | | || | | GND | | | || | | | .SUBCKT EL4430/EL 3 4 2 7 6 5 8 1 *** ***EL4430macromodel*** *** i1710.00103 i2711.00103 i3712.00105 i4713.00105 v17143 v27153 v31923 ****** c1111.03p c2121.03p c31812.1p c416170.6p ****** r110112000 r212132000 r310130e6 r41621000 r51721000 r61811.27e6 r7232120 r8218100 ****** 1121850n ****** d11114diode d21214diode d31815diode d41918diode .modeldioded(tt=120n) ****** q1163101pnp q2174111pnp q3165121pnp q4176131pnp .modelpnppnp(bf=90va=44tr=50n) ****** g11811716.0005
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EL4430, EL4431
e12011181.0 t1221201z0=50td=1.5n r1t122150 e22312211.0 ****** .ENDS
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