View EL2270CN_259298.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
EL2170, EL2270, EL2470
Data Sheet November 13, 2002 FN7053
70MHz/1mA Current Mode Feedback Amplifiers
The EL2170, EL2270, and EL2470 are single/dual/quad current-feedback operational amplifiers which achieve a -3dB bandwidth of 70MHz at a gain of +1 while consuming only 1mA of supply current per amplifier. They will operate with dual supplies ranging from 1.5V to 6V, or from single supplies ranging from +3V to +12V. In spite of their low supply current, the EL2270 and the EL2470 can output 55mA while swinging to 4V on 5V supplies. The EL2170 can output 100mA with similar output swings. These attributes make the EL2170, EL2270, and EL2470 excellent choices for low power and/or low voltage cable-driver, HDSL, or RGB applications. For applications where board space is extremely critical, the EL2170 is available in the tiny 5-pin SOT-23 package, which has a footprint 28% the size of an 8-pin SO. The EL2170, EL2270, and EL2470 are each also available in industry standard pinouts in PDIP and SO packages. For single and dual applications with disable, consider the EL2176 (8-pin single) or EL2276 (14-pin dual). For higher speed applications where power is still a concern, consider the EL2180/EL2186 family which also comes in similar single, dual, triple and quad configurations. The EL2180/EL2186 family provides a -3dB bandwidth of 250MHz while consuming 3mA of supply current per amplifier.
Features
* Single (EL2170), dual (EL2270) & quad (EL2470) topologies * 1mA supply current (per amplifier) * 70MHz -3dB bandwidth * Tiny SOT23-5 package (EL2170) * Low cost * Single- and dual-supply operation down to 1.5V * 0.15%/0.15 diff. gain/diff. phase into 150 * 800V/s slew rate * Large output drive current - 100mA (EL2170), 55mA (EL2270), 55mA (EL2470) * Also available with disable in single (EL2176) & dual (EL2276) * Higher speed EL2180/EL2186 family available (3mA/250MHz) in single, dual, and quad
Applications
* Low power/battery applications * HDSL amplifiers * Video amplifiers * Cable drivers * RGB amplifiers * Test equipment amplifiers * Current to voltage converters
Ordering Information
PART NUMBER EL2170CN EL2170CS EL2170CS-T7 EL2170CS-T13 EL2170CW-T7 EL2170CW-T3 EL2270CN EL2270CS EL2270CS-T7 EL2270CS-T13 EL2470CN EL2470CS EL2470CS-T7 EL2470CS-T13 PACKAGE 8-Pin PDIP 8-Pin SO 8-Pin SO 8-Pin SO 5-Pin SOT-23* 5-Pin SOT-23* 8-Pin PDIP 8-Pin SO 8-Pin SO 8-Pin SO 14-Pin PDIP 14-Pin SO 14-Pin SO 14-Pin SO TAPE & REEL 7" 13" 7" 13" 7" 13" 7" 13" PKG. NO. MDP0031 MDP0027 MDP0027 MDP0027 MDP0038 MDP0038 MDP0031 MDP0027 MDP0027 MDP0027 MDP0031 MDP0027 MDP0027 MDP0027
NOTE: *EL2170CW symbol is .Bxxx where xxx represents date
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.
EL2170, EL2270, EL2470 Pinouts
EL2170 (8-PIN SO, PDIP) TOP VIEW EL2270 (8-PIN SO, PDIP) TOP VIEW
EL2170 (5-PIN SOT-23) TOP VIEW
EL2470 (14-PIN SO, PDIP) TOP VIEW
2
EL2170, EL2270, EL2470
Absolute Maximum Ratings (TA = 25C)
Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . +12.6V Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS- to VS+ Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5mA Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature Range . . . . . . . . . .-40C to +85C Operating Junction Temperature Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Output Current (EL2170) . . . . . . . . . . . . . . . . . . . . . . . . . . . 120mA Output Current (EL2270) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA Output Current (EL2470) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA 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
DC Electrical Specifications
PARAMETER VOS TCVOS dVOS +IIN d+IIN -IIN d-IIN CMRR -ICMR PSRR -IPSR ROL +RIN +CIN CMIR VO
VS = 5V, RL = 150, TA = 25C unless otherwise specified. CONDITIONS MIN TYP 2.5 Measured from TMIN to TMAX EL2270, EL2470 only 5 0.5 0.5 EL2270, EL2470 only 20 4 EL2270, EL2470 only VCM = 3.5V VCM = 3.5V VS is moved from 4V to 6V VS is moved from 4V to 6V VOUT = 2.5V VCM = 3.5V 150 1 60 45 1.5 50 4 70 0.5 400 4 1.2 3.5 VS = 5 VS = 5 single-supply, high VS = 5 single-supply, low 3.5 4.0 4.0 4.0 0.3 80 50 50 100 55 55 1 2 5 10 15 5 MAX 15 UNIT mV V/C mV A nA A A dB A/V dB A/V k M pF V V V V mA mA mA mA
DESCRIPTION Input Offset Voltage Average Input Offset Voltage Drift VOS Matching +Input Current +IIN Matching -Input Current -IIN Matching Common Mode Rejection Ratio -Input Current Common Mode Rejection Power Supply Rejection Ratio -Input Current Power Supply Rejection Transimpedance +Input Resistance +Input Capacitance Common Mode Input Range Output Voltage Swing
IO
Output Current
EL2170 only EL2270 only, per amplifier EL2470 only, per amplifier
IS
Supply Current
Per amplifier VS = 5V, RF = RG = 1k, RL = 150, TA = 25C unless otherwise specified CONDITIONS AV = 1 AV = 2 VOUT = 2.5V, AV = 2 VOUT = 500mV 400 MIN
AC Electrical Specifications
PARAMETER -3dB BW -3dB BW SR tR, tF
DESCRIPTION -3dB Bandwidth -3dB Bandwidth Slew Rate Rise and Fall Time
TYP 70 60 800 4.5
MAX
UNIT MHz MHz V/s ns
3
EL2170, EL2270, EL2470
AC Electrical Specifications
PARAMETER tPD OS tS dG dP dG dP CS NOTE: 1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz. VS = 5V, RF = RG = 1k, RL = 150, TA = 25C unless otherwise specified (Continued) CONDITIONS VOUT = 500mV VOUT = 500mV VOUT = 2.5V, AV = -1 AV = 2, RL = 150 (Note 1) AV = 2, RL = 150 (Note 1) AV = 1, RL = 500 (Note 1) AV = 1, RL = 500 (Note 1) EL2270, EL2470 only, f = 5MHz MIN TYP 4.5 3.0 40 0.15 0.15 0.02 0.01 85 MAX UNIT ns % ns % % dB
DESCRIPTION Propagation Delay Overshoot 0.1% Settling Differential Gain Differential Phase Differential Gain Differential Phase Channel Separation
Test Circuit (per Amplifier)
Simplified Schematic (per Amplifier)
4
EL2170, EL2270, EL2470 Typical Performance Curves
Non-Inverting Frequency Response (Gain) Non-Inverting Frequency Response (Phase) Frequency Response for Various RF and RG
Inverting Frequency Response (Gain)
Inverting Frequency Response (Phase)
Frequency Response for Various RL and CL
Transimpedance (ROL)
PSRR and CMRR
Frequency Response for Various CIN-
5
EL2170, EL2270, EL2470 Typical Performance Curves (Continued)
Voltage and Current Noise vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
FOutput Voltage vs Frequency
-3dB Bandwidth and Peaking vs Supply Voltage for Various Non-Inverting Gains
-3dB Bandwidth and Peaking vs Supply Voltage for Various Inverting Gains
Output Voltage Swing vs Supply Voltage
Supply Current vs Supply Voltage
Common-Mode Input Range vs Supply Voltage
Slew Rate vs Supply Voltage
6
EL2170, EL2270, EL2470 Typical Performance Curves (Continued)
Input Bias Current vs Die Temperature
Short-Circuit Current vs Die Temperature
Transimpedance (ROL) vs Die Temperature
-3dB Bandwidth and Peaking vs Die Temperature for Various Non-Inverting Gains
-3dB Bandwidth and Peaking vs Die Temperature for Various Inverting Gains
Input Offset Voltage vs Die Temperature
Supply Current vs Die Temperature
Input Voltage Range vs Die Temperature
Slew Rate vs Die Temperature
7
EL2170, EL2270, EL2470 Typical Performance Curves (Continued)
Differential Gain and Phase vs DC Input Voltage at 3.58MHz/AV = +2
Differential Gain and Phase vs DC Input Offset at 3.58MHz/AV = +1
Settling Time vs Settling Accuracy
Small-Signal Step Response
Large-Signal Step Response
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-pin SO Maximum Power Dissipation vs Ambient Temperature
8
EL2170, EL2270, EL2470 Typical Performance Curves (Continued)
14-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 14-Pin SO Maximum Power Dissipation vs Ambient Temperature
Channel Separation vs Frequency
5-Pin Plastic SOT-23 Maximum Power Dissipation vs Ambient Temperature
Applications Information
Product Description
The EL2170, EL2270, and EL2470 are current-feedback operational amplifiers that offer a wide -3dB bandwidth of 70MHz and a low supply current of 1mA per amplifier. All of these products also feature high output current drive. The EL2170 can output 100mA, while the EL2270 and the EL2470 can output 55mA per amplifier. The EL2170, EL2270, and EL2470 work with supply voltages ranging from a single 3V to 6V, and they are also capable of swinging to within 1V of either supply on the input and the output. Because of their current-feedback topology, the EL2170, EL2270, and EL2470 do not have the normal gain-bandwidth product associated with voltage-feedback operational amplifiers. This allows their -3dB bandwidth to remain relatively constant as closed-loop gain is increased. This combination of high bandwidth and low power, together with aggressive pricing make the EL2170, EL2270, and EL2470 the ideal choice for many low-power/high-bandwidth applications such as portable computing, HDSL, and video processing. For applications where board space is extremely critical, the EL2170 is available in the tiny 5-pin SOT-23 package, which has a footprint 28% the size of an 8-pin SO. The EL2170,
EL2270, and EL2470 are each also available in industry standard pinouts in PDIP and SO packages. For single and dual applications with disable, consider the EL2176 (8-pin single) and EL2276 (14-pin dual). If higher speed is required, refer to the EL2180/EL2186 family which provides singles, duals, triples, and quads with 250MHz of bandwidth while consuming 3mA of supply current per amplifier.
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. The power supply pins must be well bypassed to reduce the risk of oscillation. The combination of a 4.7F tantalum capacitor in parallel with a 0.1F capacitor has been shown to work well when placed at each supply pin. For good AC performance, parasitic capacitance should be kept to a minimum especially at the inverting input (see the Capacitance at the Inverting Input section). Ground plane construction should be used, but it should be removed from the area near the inverting input to minimize any stray capacitance at that node. Carbon or Metal-Film resistors are
9
EL2170, EL2270, EL2470
acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of their additional series inductance. Use of sockets, particularly for the SO package should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in some additional peaking and overshoot. EL2170, EL2270, and EL2470 will operate on dual supplies ranging from 1.5V to 6V. With a single-supply, the EL2170, EL2270, and EL2470 will operate from +3V to +12V. As supply voltages continue to decrease, it becomes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages. The EL2170, EL2270, and EL2470 have an input voltage range that extends to within 1V of either supply. So, for example, on a single +5V supply, the EL2170, EL2270, and EL2470 have an input range which spans from 1V to 4V. The output range of the EL2170, EL2270, and EL2470 is also quite large, extending to within 1V of the supply rail. On a 5V supply, the output is therefore capable of swinging from -4V to +4V. single-supply output range is even larger because of the increased negative swing due to the external pull-down resistor to ground. On a single +5V supply, output voltage range is about 0.3V to 4V.
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or current-feedback amplifier can be affected by stray capacitance at the inverting input. For inverting gains this parasitic capacitance has little effect because the inverting input is a virtual ground, but for non-inverting gains this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier. This pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. The use of large value feedback and gain resistors further exacerbates the problem by further lowering the pole frequency. The experienced user with a large amount of PC board layout experience may find in rare cases that the EL2170, EL2270, and EL2470 have less bandwidth than expected. The reduction of feedback resistor values (or the addition of a very small amount of external capacitance at the inverting input, e.g. 0.5pF) will increase bandwidth as desired. Please see the curves for Frequency Response for Various RF and RG, and Frequency Response for Various CIN-.
Video Performance
For good video performance, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This is especially difficult when driving a standard video load of 150, because of the change in output current with DC level. Until the EL2170, EL2270, and EL2470, good Differential Gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance). These currents were typically more than the entire 1mA supply current of each EL2170, EL2270, and EL2470 amplifier! Special circuitry has been incorporated in the EL2170, EL2270, and EL2470 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.15% and 0.15 while driving 150 at a gain of +2. Video performance has also been measured with a 500 load at a gain of +1. Under these conditions, the EL2170, EL2270, and EL2470 have dG and dP specifications of 0.01% and 0.02 respectively while driving 500 at AV = +1.
Feedback Resistor Values
The EL2170, EL2270, and EL2470 have been designed and specified at gains of +1 and +2 with RF = 1k. This value of feedback resistor gives 70MHz of -3dB bandwidth at AV = +1 with about 1.5dB of peaking, and 60MHz of -3dB bandwidth at AV = +2 with about 0.5dB of peaking. Since the EL2170, EL2270, and EL2470 are current-feedback amplifiers, it is also possible to change the value of RF to get more bandwidth. As seen in the curve of Frequency Response For Various RF and RG, bandwidth and peaking can be easily modified by varying the value of the feedback resistor. Because the EL2170, EL2270, and EL2470 are currentfeedback amplifiers, their gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL2170, EL2270, and EL2470 to maintain about the same -3dB bandwidth, regardless of closed-loop gain. However, as closed-loop gain is increased, bandwidth decreases slightly while stability increases. Since the loop stability is improving with higher closed-loop gains, it becomes possible to reduce the value of RF below the specified 1k and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain.
Output Drive Capability
In spite of its low 1mA of supply current, the EL2170 is capable of providing a minimum of 80mA of output current. Similarly, each amplifier of the EL2270 and the EL2470 is capable of providing a minimum of 50mA. These output drive levels are unprecedented in amplifiers running at these supply currents. With a minimum 80mA of output drive, the EL2170 is capable of driving 50 loads to 4V, making it an excellent choice for driving isolation transformers in telecommunications applications. Similarly, the 50mA minimum output drive of each EL2270 and EL2470 amplifier allows swings of 2.5V into 50 loads.
Supply Voltage Range and Single-Supply Operation
The EL2170, EL2270, and EL2470 have been designed to operate with supply voltages having a span of greater than 3V, and less than 12V. In practical terms, this means that the 10
EL2170, EL2270, EL2470
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 EL2170, EL2270, and EL2470 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a backtermination resistor. In these applications, a small series resistor (usually between 5 and 50) can be placed in series with the output to eliminate most peaking. The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking. temperature (TJMAX) for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the EL2170, EL2270, and EL2470 to remain in the safe operating area. These parameters are calculated as follows [1]:
T JMAX = T MAX + ( JA x n x PD MAX )
where: TMAX = Maximum ambient temperature JA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows [2]:
V OUTMAX PD MAX = ( 2 x V S x I SMAX ) + ( V S - V OUTMAX ) x --------------------------R
L
Current Limiting
The EL2170, EL2270, and EL2470 have no internal currentlimiting circuitry. If any output is shorted, it is possible to exceed the Absolute Maximum Ratings for output current or power dissipation, potentially resulting in the destruction of the device.
where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Maximum output voltage of the application RL = Load resistance
Power Dissipation
With the high output drive capability of the EL2170, EL2270, and EL2470, it is possible to exceed the 150C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25, it is important to calculate the maximum junction
Typical Application Circuits
INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER
FAST-SETTLING PRECISION AMPLIFIER
11
EL2170, EL2270, EL2470 Typical Application Circuits
(Continued)
DIFFERENTIAL LINE-DRIVER/RECEIVER
12
EL2170, EL2270, EL2470 EL2170/EL2270/EL2470 Macromodel
* Revision A, March 1995 * AC characteristics used Rf=Rg=1K,RL=150 * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt EL2170/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 11 165 l1 11 12 25nH* iinp 3 0 0.5uA iinm 2 0 4uA* r12 3 0 4Meg * * 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 0.5uH c5 17 0 0.69pF r5 17 0 300 * * Transimpedance Stage * g1 0 18 17 0 1.0 rol 18 0 400K cdp 18 0 1.9pF * * 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 0.4mA ios2 20 4 0.4mA * Supply Current ips 7 4 1nA * * Error Terms * ivos 0 23 2mA vxx 23 0 0V e4 24 0 3 0 1.0
13
EL2170, EL2270, EL2470
e5 25 0 7 0 1.0 e6 26 0 4 0 -1.0 r9 24 23 0.316K r10 25 23 3.2K r11 26 23 3.2K * * Models * .model qn npn(is=5e-15 bf=200 tf=0.01nS) .model qp pnp(is=5e-15 bf=200 tf=0.01nS) .model dclamp d(is=1e-30 ibv=0.266 + bv=1.3v n=4) .ends
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 14

▲Up To Search▲

Price & Availability of EL2270CN

	To Download EL2270CN Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .