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EL400
September 20, 2002 FN7156
200MHz Current Feedback Amplifier
The EL400 is a wide bandwidth, fast settling monolithic amplifier built using an advanced complementary bipolar process. This amplifier uses current-mode feedback to achieve more bandwidth at a given gain than conventional operational amplifiers. Designed for closed-loop gains of 1 to 8, the EL400 has a 200MHz -3dB bandwidth (AV = +2), and 12ns settling to 0.05% while consuming only 15mA of supply current. The EL400 is an obvious high-performance solution for video distribution and line-driving applications. With low 15mA supply current, differential gain/phase of 0.02%/0.01, and a minimum 50mA output drive, performance in these areas is assured. The EL400's settling to 0.05% in 12ns, low distortion, and ability to drive capacitive loads make it an ideal flash A/D driver. The wide 200MHz bandwidth and extremely linear phase allow unmatched signal fidelity. D/A systems can also benefit from the EL400, especially if linearity and drive levels are important.
Features
* 200MHz -3dB bandwidth, AV = 2 * 12ns settling to 0.05% * VS = 5V @ 15mA * Low distortion: HD2, HD3 @ -60dBc at 20MHz * Differential gain 0.02% at NTSC, PAL * Differential phase 0.01 at NTSC, PAL * Overload/short-circuit protected * 1 to 8 closed-loop gain range * Low cost * Direct replacement for CLC400
Applications
* Video gain block * Video distribution * HDTV amplifier * High-speed A/D conversion * D/A I-V conversion
Ordering Information
PART NUMBER EL400CN EL400CS TEMP. RANGE -40C to +85C -40C to +85C PACKAGE 8-Pin PDIP 8-Pin SO PKG. NO. MDP0031 MDP0027
* Photodiode, CCD preamps * IF processors * High-speed communications
Pinout
EL400 (8-PIN PDIP, SO) TOP VIEW
Manufactured under U.S. Patent No. 4,893,091
1
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EL400
Absolute Maximum Ratings (TA = 25C)
Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output is short-circuit protected to ground, however, maximum reliability is obtained if IOUT does not exceed 70mA. Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C Pin Temperature (Soldering, 5 Seconds). . . . . . . . . . . . . . . . . 300C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-60C to +150C Thermal Resistance: . . . . . . . . . . . . . . . . . . . . . . . .JA = 95C/W PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . JA = 175C/W SO-8
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 VOS DESCRIPTION Input Offset Voltage
VS = 5V, RL = 100 unless otherwise specified. TEST CONDITIONS TEMP 25C TMIN TMAX MIN TYP 2.0 MAX 5.5 8.7 9.5 10.0 10.0 40.0 25.0 41.0 50.0 10.0 200.0 25.0 41.0 35.0 100.0 40.0 40.0 50.0 50.0 15.0 100.0 50.0 0.5 0.1 2.0 1.2 50.0 35.0 3.2 3.0 30.0 3.5 3.4 125.0 80.0 140.0 70.0 2.1 2.0 0.2 200.0 23.0 200.0 UNIT mV mV mV V/C A A nA/C A A A nA/C dB dB mA k k pF W V V mA mA V V V/mA V/mA V/mA
d(VOS)/dT +IIN
Average Offset Voltage Drift +Input Current
(Note 1)
All 25C, TMAX TMIN
d(+IIN)/dT -IIN
Average +Input Current Drift -Input Current
(Note 1)
All 25C TMIN TMAX
d(-IIN)/dT PSRR CMRR IS +RIN
Average -Input Current Drift Power Supply Rejection Ratio Common-Mode Rejection Ratio Supply Current--Quiescent +Input Resistance
(Note 1)
All All All
No Load
All 25C, TMAX TMIN
CIN ROUT CMIR
Input Capacitance Output Impedance (DC) Common-Mode Input Range (Note 2)
All All 25C, TMAX TMIN
IOUT
Output Current
25C, TMAX TMIN
VOUT VOUTL ROL
Output Voltage Swing Output Voltage Swing Transimpedance
No Load 100
All 25C 25C TMIN TMAX
NOTES: 1. Measured from TMIN to TMAX. 2. Common-Mode Input Range for Rated Performance.
2
EL400
Closed-Loop AC Electrical Specifications
PARAMETER Frequency Response SSBW DESCRIPTION -3dB Bandwidth (VOUT < 0.5VPP)
VS = 5V, RF = 250, AV = +2, RL = 100 unless otherwise specified. TEST CONDITIONS TEMP 25C TMIN TMAX MIN 150.0 150.0 120.0 35.0 50.0 0.0 0.3 0.4 0.0 0.5 0.7 0.6 1.0 1.0 1.3 0.2 1.0 1.2 1.6 2.4 2.9 6.5 10.0 12.0 0.0 10.0 13.0 15.0 10.0 15.0 430.0 700.0 1600.0 -60.0 -45.0 -40.0 -45.0 -60.0 -50.0 -50.0 -157.0 -154.0 -154.0 -153.0 40.0 57.0 57.0 63.0 0.02 0.01 0.05 0.05 60.0 TYP 200.0 MAX UNITS MHz MHz MHz MHz dB dB dB dB dB dB dB ns ns ns ns ns % % V/s V/s dBc dBc dBc dBc dBc dBm (1Hz) dBm (1Hz) dBm (1Hz) V V V %PP PP %PP PP MHz
LSBW Gain Flatness GFPL
-3dB Bandwidth (VOUT < 5.0VPP) Peaking VOUT < 0.5VPP Peaking VOUT < 0.5VPP Rolloff VOUT < 0.5VPP
AV = +5 < 40MHz
All 25C TMIN, TMAX
GFPH
> 40MHz
25C TMIN, TMAX
GFR
< 75MHz
25C TMIN TMAX
LPD
Linear Phase Deviation VOUT < 0.5VPP
< 75MHz
25C, TMIN TMAX
Time-Domain Response
tR1, tF1 Rise Time, Fall Time
0.5V Step
25C, TMIN TMAX
tR2, tF2 Rise Time, Fall Time tS1 tS2 OS Settling Time to 0.1% Settling Time to 0.05% Overshoot
5.0V Step 2.0V Step 2.0V Step 0.5V Step
All All All 25C TMIN, TMAX
SR
Slew Rate
AV = +2 AV = - 2
All All 25C TMIN TMAX
Distortion
HD2
2nd Harmonic Distortion at 20MHz
2VPP
HD3
3rd Harmonic Distortion at 20MHz Noise Floor > 100kHz
2VPP
25C TMIN, TMAX
Equivalent Input Noise
NF
(Note 1)
25C TMIN TMAX
INV
Integrated Noise 100kHz to 200MHz
(Note 1)
25C TMIN TMAX
Video Performance
dG dP dG dP VBW
Differential Gain (Note 2) Differential Phase (Note 2) Differential Gain (Note 2) Differential Phase (Note 2) -0.1dB Bandwidth (Note 2)
NTSC/PAL NTSC/PAL 30MHz 30MHz
25C 25C 25C 25C 25C
NOTES: 1. Noise Tests are Performed from 5MHz to 200MHz. 2. Differential Gain/Phase Tests are RL = 100. For other values of RL, see curves.
3
EL400 Typical Performance Curves
Non-Inverting Frequency Response
Inverting Frequency Response
Frequency Response for Various RLs
Open-Loop Transimpedance Gain and Phase
2nd and 3rd Harmonic Distortion
2-Tone 3rd Order Intermodulation Intercept
Equivalent Input Noise
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
Settling Time
Long-Term Settling Time
Settling Time vs Load Capacitance
4
EL400 Typical Performance Curves
Recommended RS vs Load Capacitance
(Continued)
Pulse Response AV = +2
Pulse Response AV = +2
Differential Gain and Phase (3.58MHz)
Differential Gain and Phase (4.43MHz)
Differential Gain and Phase (30MHz)
5
EL400 Equivalent Circuit
Burn-In Circuit
All Packages Use The Same Schematic.
Applications Information
Theory of Operation
The EL400 has a unity gain buffer from the non-inverting input to the inverting input. The error signal of the EL400 is a current flowing into (or out of) the inverting input. A very small change in current flowing through the inverting input will cause a large change in the output voltage. This current amplification is called the transimpedance (ROL) of the EL400 [VOUT = (ROL)*(-IIN)]. Since ROL is very large, the
current flowing into the inverting input in the steady-state (non-slewing) condition is very small. Therefore we can still use op-amp assumptions as a firstorder approximation for circuit analysis, namely that: 1. The voltage across the inputs is approximately 0V. 2. The current into the inputs is approximately 0mA.
Resistor Value Selection and Optimization
The value of the feedback resistor (and an internal capacitor) sets the AC dynamics of the EL400. The nominal value for
6
EL400
the feedback resistor is 250, which is the value used for production testing. This value guarantees stability. For a given closed-loop gain the bandwidth may be increased by decreasing the feedback resistor and, conversely, the bandwidth may be decreased by increasing the feedback resistor. Reducing the feedback resistor too much will result in overshoot and ringing, and eventually oscillations. Increasing the feedback resistor results in a lower -3dB frequency. Attenuation at high frequency is limited by a zero in the closed-loop transfer function which results from stray capacitance between the inverting input and ground. Consequently, it is very important to keep stray capacitance to a minimum at the inverting input.
Offset Adjustment Pin
Output offset voltage of the EL400 can be nulled by tying a 10k potentiometer between +VS and -VS with the slider attached to pin 1. A full-range variation of the voltage at pin 1 to 5V results in an offset voltage adjustment of at least 10mV. For best settling performance pin 1 should be bypassed to ground with a ceramic capacitor located near to the package, even if the offset voltage adjustment feature is not being used.
Printed Circuit Layout
As with any high frequency device, good PCB layout is necessary for optimum performance. Ground plane construction is a requirement, as is good power-supply and Offset Adjust bypassing close to the package. The inverting input is sensitive to stray capacitance, therefore connections at the inverting input should be minimal, close to the package, and constructed with as little coupling the ground plane as possible. Capacitance at the output node will reduce stability, eventually resulting in peaking, and finally oscillation if the capacitance is large enough. The design of the EL400 allows a larger capacitive load than comparable products, yet there are occasions when a series resistor before the capacitance may be needed. Please refer to the graphs to determine the proper resistor value needed.
Differential Gain/Phase
An industry-standard method of measuring the distortion of a video component is to measure the amount of differential gain and phase error it introduces. To measure these, a 40 IREPP reference signal is applied to the device with 0V DC offset (0IRE) at 3.58MHz for NTSC, 4.43MHz for PAL, and 30MHz for HDTV. A second measurement is then made with a 0.714V DC offset (100IRE). Differential Gain is a measure of the change in amplitude of the sine wave, and is measured in percent. Differential Phase is a measure of the change in phase, and is measured in degrees. Typically, the maximum positive and negative deviations are summed to give peak values. In general, a back terminated cable (75 in series at the drive end and 75 to ground at the receiving end) is preferred since the impedance match at both ends will absorb any reflections. However, when double-termination is used, the received signal is reduced by half; therefore a gain of 2 configuration is typically used to compensate for the attenuation. In a gain of 2 configuration, with output swing of 2VPP, with each back-terminated load at 150. The EL400 is capable of driving up to 4 back-terminated loads with excellent video performance. Please refer to the typical curves for more information on video performance with respect to frequency, gain, and loading.
Capacitive Feedback
The EL400 relies on its feedback resistor for proper compensation. A reduction of the impedance of the feedback element results in less stability, eventually resulting in oscillation. Therefore, circuit implementations which have capacitive feedback should not be used because of the capacitor's impedance reduction with frequency. Similarly, oscillations can occur when using the technique of placing a capacitor in parallel with the feedback resistor to compensate for shunt capacitances from the inverting input to ground.
7
EL400 EL400 Macromodel
* Revision A. March 1992 * Enhancements include PSRR, CMRR, and Slew Rate Limiting * Connections: +input * | -input * | | +Vsupply * ||| -Vsupply * ||| | output * ||| | | .subckt M400 32746 * * Input Stage * e1 10 0 3 0 1.0 vis 10 9 0V h2 9 12 vxx 1.0 r1 2 11 50 l1 11 12 48nH iinp 3 0 8A iinm 2 0 8A * * 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 0.1H c5 17 0 0.1pF r5 17 0 500 * * Transimpedance Stage * g1 0 18 17 0 1.0 rol 18 0 150K cdp 18 0 2.8pF * * 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 2 r8 22 6 2 ios1 7 19 2.5mA ios2 20 4 2.5mA * * Supply Current * ips 7 4 9mA * * Error Terms * ivos 0 23 5mA
8
EL400 EL400 Macromodel
(Continued)
vxx 23 0 0V e4 24 0 3 0 1.0 e5 25 0 7 0 1.0 e6 26 0 4 0 1.0 r9 24 23 3K r10 25 23 1K r11 26 23 1K * * Models * .model qn npn (is=5e-15 bf=200 tf=0.5nS) .model qp pnp (is=5e-15 bf=200 tf=0.5nS) .model dclamp d(is=1e-30 ibv=0.266 bv=1.3 n=4) .ends
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