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T NT DU C PRO LACEME r at (R) TE O LE REP rt Cente tsc O B S EN D ED po .com/ l Su p MM sil ECO echnica w.inter NO R oData Sheet w December 1995, Rev C rT w u IL or act cont -INTERS 8 1-88
EL2166
FN7052
110MHz Current Feedback Amplifier with Disable
The EL2166 is a current feedback operational amplifier with -3dB bandwidth of 110MHz at a gain of +2. Built using the Elantec proprietary monolithic complementary bipolar process, this amplifier uses current mode feedback to achieve more bandwidth at a given gain than a conventional voltage feedback operational amplifier. The EL2166 is designed to drive a double terminated 75 coax cable to video levels. Differential gain and phase are excellent when driving both loads of 500 (< 0.01%/< 0.01) and double terminated 75 cables (0.025%/0.05 @ VS = 15V, 0.04%/0.02 @ VS = 5V). The EL2166 has a superior output disable function. Time to enable or disable is < 75ns. The DISABLE pin is TTL/CMOS compatible. In disable mode, the amplifier can withstand over 1500V/s signals at their outputs. The amplifier can operate on any supply voltage from 10V (5V) to 33V (16.5V), yet consume only 7.5mA at any supply voltage. The EL2166 is available in 8-pin PDIP and 8-pin SO packages.
Features
* 110MHz 3dB bandwidth (AV = +2) * 115MHz 3dB bandwidth (AV = +1) * 0.01% differential gain, RL = 500 * 0.01 differential phase, RL = 500 * Low supply current, 7.5mA * Fast disable < 75ns * Low cost * 1500 V/s slew rate
Applications
* Video amplifiers * Cable drivers * RGB amplifiers * Test equipment amplifiers * Current to voltage converters * Broadcast equipment * High speed communications
Pinout
EL2166 (8-PIN SO, PDIP) TOP VIEW
* Video multiplexing
Ordering Information
PART NUMBER EL2166CN EL2166CS TEMP. RANGE -40C to +85C -40C to +85C PACKAGE 8-Pin PDIP 8-Pin SOIC PKG. NO. MDP0031 MDP0027
Manufactured under U.S. Patent No. 5,420,542, 4,893,091
1
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.
EL2166
Absolute Maximum Ratings (TA = 25C)
Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . . .+33V Voltage between +IN and -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Current into DISABLE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Voltage between DISABLE Pin and GND Pin . . . . . . . . . . . . . . .7V Voltage at IN+, IN-, VOUT, DISABLE, GND Pins . . . . . . . . . . . . . . . (VS-) - 0.5V to (VS+) +0.5V Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature Range . . . . . . . . . .-40C to +85C Operating Junction Temperature Plastic Packages . . . . . . . . . 150C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C 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
VS = 15V, RL = 150, TA = 25C unless otherwise specified LIMITS
PARAMETER VOS TC VOS +IIN -IIN CMRR -ICMR
DESCRIPTION Input Offset Voltage Average Offset Voltage Drift (Note 1) +Input Current -Input Current Common Mode Rejection Ratio (Note 2) -Input Current Common Mode Rejection (Note 2) Power Supply Rejection Ratio (Note 3) -Input Current Power Supply Rejection (Note 3) Transimpedance (Note 4)
CONDITIONS VS = 5V, 15V
TEMP 25C Full
MIN
TYP 2 10 0.5 5
MAX 10
UNITS mV V/C
VS = 5V, 15V VS = 5V, 15V VS = 5V, 15V VS = 5V, 15V
25C 25C 25C 25C 55
5 20
A A dB
62 0.1 2
A/V
PSRR -IPSR
25C 25C
65
72 0.1 2
dB A/V
ROL
VS = 15V RL = 400 VS = 5V RL = 150
25C
500
2000
k
25C
500
1200
k
+RIN +CIN CMIR
+Input Resistance +Input Capacitance Common Mode Input Range VS = 15V VS = 5V
25C 25C 25C 25C 25C 25C 25C 25C 25C 25C AV = +1 25C 25C
2.0
5.0 2.5
M pF V V V V V 130 10.0 10.0 50.0 mA mA mA A V
12.6 2.6 12
13.2 3.2 13.5 11.4
VO
Output Voltage Swing
RL = 400, VS = 15V RL = 150, VS = 15V RL = 150, VS = 5V
3.0 50
3.7 80 7.5 7.3 2.0
ISC IS IS, OFF IOUT, OFF VIH VIL
Output Short Circuit Current (Note 5) Supply Current Supply Current Disabled, Pin 8 = 0V Output Current Disabled, Pin 8 = 0V DISABLE Pin Voltage for Output Enabled (Note 6) DISABLE Pin Threshold for Output Disabled
VS = 5V, VS = 15V VS = 15V, VS = 5V
2.0
25C
0.8
V
2
EL2166
Open-Loop DC Electrical Specifications
VS = 15V, RL = 150, TA = 25C unless otherwise specified (Continued) LIMITS PARAMETER IDIS, ON IDIS, OFF NOTES: 1. Measured from TMIN to TMAX. 2. VCM = 12.6V for VS = 15V and TA = 25C. VCM = 2.6V for VS = 5V and TA = 25C. 3. The supplies are moved from 5V to 15V. 4. VOUT = 7V for VS = 15V, and VOUT = 2V for VS = 5V. 5. A heat sink is required to keep junction temperature below absolute maximum when an output is shorted. 6. The EL2166 will remain ENABLED if pin 8 is either left unconnected or VIH is applied to pin 8. DESCRIPTION DISABLE Pin Input Current, Pin 8 = +5V DISABLE Pin Input Current, Pin 8 = 0V CONDITIONS TEMP 25C 25C -150 MIN TYP 70 -60 MAX 150 UNITS A A
Closed-Loop AC Electrical Specifications
PARAMETER BW DESCRIPTION -3dB Bandwidth (Note 1)
VS = 15V, AV = +2, RF = 560, RL = 150, TA = 25C unless otherwise noted LIMITS CONDITIONS VS = 15V, AV = +2 VS = 15V, AV = +1 VS = 5V, AV = +2 VS = 5V, AV = +1 MIN TYP 110 115 95 100 1000 1500 3.2 4.3 VOUT = 500mV VOUT = 10V AV = 1, RL = 1k 7 35 MAX UNITS MHz MHz MHz MHz V/s ns ns % ns
SR t R , tF tPD OS tS
Slew Rate (Note 1)(Note 2) Rise Time, Fall Time (Note 1) Propagation Delay (Note 1) Overshoot (Note 1) 0.1% Settling Time (Note 1)
RL = 400 VOUT = 500mV
dG
Differential Gain (Note 1)(Note 3)
RL = 150, VS = 15V RL = 150, VS = 5V RL = 500, VS = 15V RL = 500, VS = 5V
0.025 0.05 0.01 0.01 0.04 0.02 0.01 0.01 75
% % % % deg () deg () deg () deg () ns
dP
Differential Phase (Note 1)(Note 3)
RL = 150, VS = 15V RL = 150, VS = 5V RL = 500, VS = 15V RL = 500, VS = 5V
tDIS NOTES:
Disable/Enable Time (Note 4)
1. All AC tests are performed on a "warmed up" part, except for Slew Rate, which is pulse tested. 2. Slew Rate is with VOUT from +10V to -10V and measured at the 25% and 75% points. 3. DC offset from -0.714V through +0.714V, AC amplitude 286 mVP-P, f = 3.58MHz. 4. Disable/Enable time is defined as the time from when the logic signal is applied to the DISABLE pin to when the output voltage has gone 50% of the way from its initial to its final value.
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EL2166 Typical Performance Curves
Non-Inverting Frequency Response (Gain) Non-Inverting Frequency Response (Phase) Frequency Response for Various RL
Inverting Frequency Response (Gain)
Inverting Frequency Response (Phase)
Frequency Response for Various RF and RG
3dB Bandwidth vs Supply Voltage for AV = -1
Peaking vs Supply Voltage for AV = -1
3dB Bandwidth vs Temperature for AV = - 1
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EL2166 Typical Performance Curves
3dB Bandwidth vs Supply Voltage for AV = +1
(Continued)
Peaking vs Supply Voltage for AV = +1
3dB Bandwidth vs Temperature for AV = +1
3dB Bandwidth vs Supply Voltage for AV = +2
Peaking vs Supply Voltage for AV = +2
3dB Bandwidth vs Temperature for AV = +2
3dB Bandwidth vs Supply Voltage for AV = +10
Peaking vs Supply Voltage for AV = +10
3dB Bandwidth vs Temperature for AV = +10
5
EL2166 Typical Performance Curves
Frequency Response for Various CL
(Continued)
Frequency Response for Various CIN-
PSRR and CMRR vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
Transimpedance (ROL) vs Frequency
Voltage and Current Noise vs Frequency
Closed-Loop Output Impedance vs Frequency
Transimpedance (ROL) vs Die Temperature
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EL2166 Typical Performance Curves
Offset Voltage vs Die Temperature
(Continued)
Supply Current vs Die Temperature
Supply Current vs Supply Voltage
+Input Resistance vs Die Temperature
Input Current vs Die Temperature
+Input Bias Current vs Input Voltage
Output Voltage Swing vs Die Temperature
Short Circuit Current vs Die Temperature
PSRR & CMRR vs Die Temperature
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EL2166 Typical Performance Curves
Differential Gain vs DC Input Voltage, RL = 150
(Continued)
Differential Phase vs DC Input Voltage, RL = 150
Small Signal Pulse Response
Differential Gain vs DC Input Voltage, RL = 500
Differential Phase vs DC Input Voltage, RL = 500
Large Signal Pulse Response
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
Settling Time vs Settling Accuracy
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EL2166 Typical Performance Curves
(Continued)
Long Term Settling Error
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-Pin Plastic SO Maximum Power Dissipation vs Ambient Temperature
ENABLE Response for a Family of D.C. Inputs
DISABLE Response for a Family of D.C. Inputs
AV = +2, RL = 150, VS = 15V
AV = +2, RL = 150, VS = 15V
Burn-In Circuit
EL2166
9
EL2166 Differential Gain and Phase Test Circuit
Simplified Schematic
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EL2166 Applications Information
Product Description
The EL2166 is a current mode feedback amplifier that offers wide bandwidth and good video specifications at a moderately low supply current. It is built using Elantec's proprietary complimentary bipolar process and is offered in industry standard pin-outs. Due to the current feedback architecture, the EL2166 closed-loop 3dB bandwidth is dependent on the value of the feedback resistor. First the desired bandwidth is selected by choosing the feedback resistor, RF, and then the gain is set by picking the gain resistor, RG. The curves at the beginning of the Typical Performance Curves section show the effect of varying both RF and RG. The 3dB bandwidth is only slightly dependent on the power supply voltage. The bandwidth reduces from 110MHz to 95MHz as supplies are varied from 15V to 5V. To compensate for this, smaller values of feedback resistor can be used at lower supply voltages. ground and stray capacitance is therefore not "seen" by the amplifier.
Feedback Resistor Values
The EL2166 has been designed and specified with RF = 560 for AV = +2. This value of feedback resistor yields relatively flat frequency response with < 1.5dB peaking out to 110MHz. As is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. Inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. By reducing RF to 430, bandwidth can be extended to 120MHz with 4.5dB of peaking. See the curves in the Typical Performance Curves section which show 3dB bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages.
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently 3dB bandwidth drop off at high temperature, the EL2166 was designed to have little supply current variations with temperature. An immediate benefit from this is that the 3dB bandwidth does not drop off drastically with temperature. With VS = 15V and AV = +2, the bandwidth only varies from 115MHz to 95MHz over the entire die junction temperature range of 0C < T < 150C.
Power Supply Bypassing and Printed Circuit Board Layout
As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible, below 1/4". The power supply pins must be well bypassed to reduce the risk of oscillation. A 1.0F tantalum capacitor in parallel with a 0.01F ceramic capacitor is adequate for each supply pin. For good AC performance, parasitic capacitances should be kept to a minimum, especially at the inverting input (see Capacitance at the Inverting Input section). This implies keeping the ground plane away from this pin. Carbon resistors are acceptable, while use of wire-wound resistors should not be used because of their parasitic inductance. Similarly, capacitors should be low inductance for best performance. Use of sockets, particularly for the SO package, should be avoided. Sockets add parasitic inductance and capacitance which will result in peaking and overshoot.
Supply Voltage Range
The EL2166 has been designed to operate with supply voltages from 5V to 15V. AC performance, including -3dB bandwidth and differential gain and phase, shows little degradation as the supplies are lowered to 5V. For example, as supplies are lowered from 15V to 5V, -3dB bandwidth reduces only 15MHz, and differential gain and phase remain less than 0.05%/0.02 respectively. If a single supply is desired, values from +10V to +30V can be used as long as the input common mode range is not exceeded. When using a single supply, be sure to either 1) DC bias the inputs at an appropriate common mode voltage and AC couple the signal, or 2) ensure the driving signal is within the common mode range of the EL2166.
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the AC and transient performance of the EL2166 when operating in the non-inverting configuration. The characteristic curve of gain vs. frequency with variations of CIN- emphasizes this effect. The curve illustrates how the bandwidth can be extended over 30MHz with some additional peaking with an additional 5pF of capacitance at the VIN- pin for the case of AV = +2. Higher values of capacitance will be required to obtain similar effects at higher gains. In the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual
Disable Function
The EL2166 has a superior disable function that has been optimized for video performance. Time to disable/enable is around 75ns. During disable, the output of the EL2166 can withstand over 1500V/s slew rate signals at its output and the output does not draw excessive currents. The feed-through can be modeled as a 1.5pF capacitor from VIN+ to the output, and the output impedance can be modeled as 4.4pF in parallel with 180k to ground when disabled. Consequently, multiplexing with the EL2166 is very easy. Simply tie the outputs of multiple EL2166s together and drive the /DISABLE pins with standard TTL or CMOS signals. The
11
EL2166
disable signal applied to the /DISABLE pin is referenced to the GND pin. The GND pin can be tied as low as the VS- pin. This allows the EL2166 to be operated on a single supply. For example, one could tie the VS- and GND pins to 0V and VS+ to +10V, and then use standard TTL or CMOS to drive the /DISABLE pin. Remember to keep the inputs of the EL2166 within their common mode range. Response for Various CL curves in the Typical Performance Curve section.
EL2166 Multiplexer Switching 4Vpp Uncorrelated Sinewaves to 2Vpp Uncorrelated Sinewaves
Multiplexing with the EL2166
An example of multiplexing with the EL2166 and its response curve is shown below. Always be sure that no more than 5V is applied between VIN+ and VIN-, which is compatible with standard video signals. This usually becomes an issue only when using the disable feature and amplifying large voltages.
Settling Characteristics
The EL2166 offers superb settling characteristics to 0.1%, typically in the 35ns to 40ns range. There are no aberrations created from the input stage which often cause longer settling times in other current feedback amplifiers. The EL2166 is not slew rate limited, therefore any size step up to 10V gives approximately the same settling time. As can be seen from the Long Term Settling Error curve, for AV = +1, there is approximately a 0.02% residual which tails away to 0.01% in about 20s. This is a thermal settling error caused by a power dissipation differential (before and after the voltage step). For AV = -1, due to the inverting mode configuration, this tail does not appear since the input stage does not experience the large voltage change as in the noninverting mode. With AV = -1, 0.01% settling time is slightly greater than 100ns.
Power Dissipation
The EL2166 amplifier combines both high speed and large output current drive capability at a moderate supply current in very small packages. It is possible to exceed the maximum junction temperature allowed under certain supply voltage, temperature, and loading conditions. To ensure that the EL2166 remains within its absolute maximum ratings, the following discussion will help to avoid exceeding the maximum junction temperature. The maximum power dissipation allowed in a package is determined by its thermal resistance and the amount of temperature rise according to:
T JMAX - T AMAX P DMAX = ------------------------------------------- JA
DUAL EL2166 MULTIPLEXER
In the multiplexer above, suppose one amp is disabled and the other has amplified a signal to +10V at VOUT. The voltage at pin 2 of the disabled amplifier will now be +5V due to the resistor divider action. Therefore, any applied voltage at pin 3 of the disabled amplifier must remain above 0V if the voltage between pins 2 and 3 of the disabled amplifier is to remain less than 5V. Also keep in mind that each disabled amplifier adds more capacitance to the bus, as discussed above. See Disable Function, and Driving Cables and Capacitive Loads in this section, and the Frequency
12
EL2166
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
V OUT P DMAX = 2 x V S + ( V S - V OUT ) x --------------RL
packages. The curves assume worst case conditions of TA = +85C and IS = 10mA.
Supply Voltage vs RLOAD for Various VOUT (SO Package)
where IS is the supply current. (To be more accurate, the quiescent supply current flowing in the output driver transistor should be subtracted from the first term because, under loading and due to the class AB nature of the output stage, the output driver current is now included in the second term.) In general, an amplifier's AC performance degrades at higher operating temperature and lower supply current. Unlike some amplifiers, the EL2166 maintains almost constant supply current over temperature so that AC performance is not degraded as much over the entire operating temperature range. Of course, this increase in performance doesn't come for free. Since the current has increased, supply voltages must be limited so that maximum power ratings are not exceeded. The EL2166 consumes typically 7.5mA and maximum 10.0mA. The worst case power in an IC occurs when the output voltage is at half supply, if it can go that far, or its maximum values if it cannot reach half supply. If we set the two PDMAX equations equal to each other, and solve for VS, we can get a family of curves for various loads and output voltages according to:
Supply Voltage vs RLOAD for Various VOUT (PDIP Package)
R L x ( T JMAX - T AMAX ) 2 -------------------------------------------------------------- + ( V OUT ) JA V S = --------------------------------------------------------------------------------------------2 x I S x R L + V OUT
The curves do not include heat removal or forcing air, or the simple fact that the package will probably be attached to a circuit board, which can also provide some form of heat removal. Larger temperature and voltage ranges are possible with heat removal and forcing air past the part.
Current Limit
The EL2166 has an internal current limit that protects the circuit in the event of the output being shorted to ground. This limit is set at 80mA nominally and reduces with junction temperature. At a junction temperature of 150C, the current limits at about 50mA. If the output is shorted to ground, the power dissipation could be well over 1W. Heat removal is required in order for the EL2166 to survive an indefinite short.
The following curves show supply voltage (VS) vs RLOAD for various output voltage swings for the 2 different
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back termination series resistor will decouple the EL2166 from the capacitive cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without termination resistors. In these applications, an additional small value (5-50) resistor in series with the output will eliminate most peaking. The gain resistor, RG, can be chosen to make up for the gain loss created by this additional series resistor at the output.
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EL2166 EL2166 Macromodel
* Revision A, May 1994 * AC Characteristics used CIN- (pin 2) = 1pF; RF = 560 * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt EL2166/EL 3 2 7 4 6 * * Input Stage * e1 10 0 3 0 1.0 vis 10 9 0V h2 9 12 vxx 1.0 r1 2 11 130 l1 11 12 25nH iinp 3 0 0.5A iinm 2 0 5A r12 3 0 2Meg * * Slew Rate Limiting * h1 13 0 vis 600 r2 13 14 1K d1 14 0 dclamp d2 0 14 dclamp * * High Frequency Pole * *e2 30 0 14 0 0.00166666666 l3 30 17 0.8H c5 17 0 1.25pF r5 17 0 500 * * Transimpedance Stage * g1 0 18 17 0 1.0 ro1 18 0 2Meg cdp 18 0 2.9pF * * Output Stage * q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 4 r8 22 6 4 ios1 7 19 2mA ios2 20 4 2mA * * Supply Current * ips 7 4 2mA * * Error Terms * ivos 0 23 2mA
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EL2166
vxx 23 0 0V e4 24 0 3 0 1.35K e5 25 0 7 0 1.0 e6 26 0 4 0 1.0 r9 24 23 562 r10 25 23 1K r11 26 23 1K * * Models * .model qn npn (is=5e-15 bf=200 tf=0.1ns) .model qp pnp (is=5e-15 bf=200 tf=0.1ns) .model dclamp d (is=1e-30 ibv=0.266 bv=2.8 n=4) .ends
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