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UCT ENT ROD TE P EPLACEM ter at OLE OBS NDED R port Cen /tsc ME up sil.com COM chn cal S r O RE urSheet i www.inte e N Data T November 14, 2002 ct o RSIL or conta -INTE 1-888
EL2110
FN7042
Low Cost, Gain of 1, Video Op Amp
The EL2110 operational amplifier, built using Elantec's complementary bipolar process, offers unprecedented high frequency performance at a very low cost. It is suitable for any application, such as consumer video, where traditional DC performance specifications are of secondary importance to the high frequency specifications. On a 5V supply at a gain of +1 the EL2110 will drive a 150 load to +2V, with a bandwidth of 50MHz. This device achieves 0.1dB bandwidth at 5MHz. The recommended power supply voltage is 5V. At zero and 5V supplies, the inputs will operate to ground. When the outputs are at 0V the amplifier draws only 2.4mA of supply current.
Features
* Optimized for 5V operation * Stable at gain of 1 * 50MHz gain bandwidth product * 130V/s slew rate * Drives 150 load to video levels * Input and outputs operate at negative supply rail
Applications
* Consumer video amplifier * Active filters/integrators * Cost sensitive applications * Single supply amplifiers
Ordering Information
PART NUMBER EL2110CN EL2110CS EL2110CW PACKAGE 8-Pin PDIP 8-Pin SO 5-Pin SOT-23* TAPE & REEL PKG. NO. MDP0031 MDP0027 MDP0038
*EL2110CW symbol is .Dxxx where xxx represents date code
Pinouts
EL2110 (5-PIN SOT23) TOP VIEW
OUT 1
-
EL2110 (8-PIN PDIP, SO) TOP VIEW
5 VS+ NC 1 IN- 2 IN+ 3 GND 4 8 NC 7 VS+ 6 OUT 5 NC
GND
2
+
+
IN+
3
4
IN-
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.
EL2110
Absolute Maximum Ratings (TA = 25C)
Total Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Peak Output Current . . . . . . . . . . . . . . . . . . . . . . 75mA per amplifier Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C Operating Temperature Range . . . . . . . . . . . . . . . . -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. 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 IB IOS TCIOS AVOL
VS = +5V, RL = 1k, VIN = 1V, TA = 25C unless otherwise specified. CONDITIONS MIN -20 (Note 1) -15 -1 (Note 1) VOUT = 0.5, 2.5, RL = 1k VOUT = 0.5, 2.5, RL = 150k 160 160 43 55 0.0 RFB = RG = 1k, RL = 150 Output to Ground (Note 2) No load (per channel) VIN = 0V Differential Common mode 2.8 75 2.0 3.2 125 2.4 150 1.5 1 0.150 Single supply 4 6 3.0 TYP 10 -50 -7 0.3 -3 250 250 50 65 3.0 -3 1.0 MAX 20 UNIT mV V/C A A nA/C V/V V/V dB dB V V mA mA k M pF W V
DESCRIPTION Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Offset Current Average Offset Current Drift Open Loop Gain
PSRR CMRR CMIR VOUT ISC IS RIN
Power Supply Rejection Ratio Common Mode Rejection Ratio Common Mode Input Range Output Voltage Swing Output Short Circuit Current Supply Current Input Resistance
VS = 4.5V to 5.5V VCM = 0V to 3.8V
CIN ROUT PSOR NOTES:
Input Capacitance Output Resistance Power Supply Operating Range
AV = 1 @ 10MHz
1. Measured from TMIN to TMAX. 2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.
Closed-Loop AC Electrical Specifications
PARAMETER BW DESCRIPTION -3dB Bandwidth (VOUT = 0.4mVP-P)
VS = 5V, AC Test Figure, TA = 25C unless otherwise specified. CONDITIONS AV = 1 MIN TYP 100 10 50 55 85 (Note 1) 0.1V step 0.1V step 8 130 11 2 15 MAX UNIT MHz MHz MHz V/s MHz ns %
0.1dB Bandwidth (VOUT = 0.4mVP-P) AV = 1 GBWP PM SR FBWP tR , tF OS Gain Bandwidth Product Phase Margin Slew Rate Full Power Bandwidth Rise Time, Fall Time Overshoot
2
EL2110
Closed-Loop AC Electrical Specifications
PARAMETER tPD tS dG dP eN iN CS NOTES: 1. For VS = 5V, VOUT = 4VP-P. Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*VPEAK) 2. Video performance measured at VS = 5V, AV = 2 with 2 times normal video level across RL = 150 DESCRIPTION Propagation Delay Settling to 0.1% (AV = 1) Differential Gain (Note 2) Differential Phase (Note 2) Input Noise Voltage Input Noise Current Channel Separation VS = 5V, 2V step NTSC/PAL NTSC/PAL 10kHz 10kHz P = 5MHz VS = 5V, AC Test Figure, TA = 25C unless otherwise specified. (Continued) CONDITIONS MIN TYP 3.5 80 0.1 0.2 15 1.5 55 MAX UNIT ns ns % nV/Hz nV/Hz dB
3
EL2110 Typical Performance Curves
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-Pin SO Maximum Power Dissipation vs Ambient Temperature
5-Pin SOT23 Maximum Power Dissipation vs Ambient Temperature
Simplified Block Diagram
supplies. All electrical characteristics are measured with a 5V supply.
Output Swing vs Load
Please refer to the simplified block diagram. This amplifier provides an NPN pull-up transistor output and a passive 1250 pull-down resistor to the most negative supply. In a application where the load is connected to VS- the output voltage can swing to within 200mV of VS-.
Output Drive Capability
This device does not have short circuit protection. Each output is capable of than 100mA into a shorted output. Care must be used in the design to limit the output current with a series resistor.
Single 5V Supply Video Cable Driver
These amplifiers may be used as a direct coupled video cable driver with a gain of 2. With a 75 back matching resistor driving a terminated 75 cable the output at the cable load will be original video level (1V NTSC). The best operating mode is with direct coupling. The input signal must be offset to keep the entire signal within the range of the amplifier. The required offset voltage can be set with a resistor divider and a bypass capacitor in the video path (Figure 1). The input DC offset should be between 0.3V and 0.5V. With RA = 68k and RB = 4.7k the input offset will be 0.32V. Since these amplifiers require a DC load at their outputs it is good design practice to add a 250 resistor to ground directly at the amplifier output. Then if the 75 cable termination resistor were inadvertently removed there would still be an output signal. The values in Figure 1 give an output range of 0V to 2.6V. Output capacitive coupling also has some restrictions. These amplifiers require a DC load at their outputs. A 75 back
Applications Information
Product Description
The EL2110 operational amplifier is stable at a gain of 1. It is built on Elantec's proprietary complimentary bipolar process. This topology allows it to be used in a variety of applications where current mode amplifiers are not appropriate because of restrictions placed on the feedback elements. This product is especially designed for applications where high bandwidth and good video performance characteristics are desired but the higher cost of more flexible and sophisticated products are prohibitive.
Power Supplies
The EL2110 is designed to work at a supply voltage difference of 4.5V to 5.5V. It will work on any combination of
4
EL2110
matching resistor to a cable and a 75 load to ground at the end of the cable provide a 150 DC load. But output capacitive coupling opens this DC path so an extra pulldown resistor on the amplifier output to ground is required. Figure 4 shows a 250 resistor. Capacitively coupling the output will require that we shift the output offset voltage higher than in the direct coupled case. Using RA = 43k and RB = 4.7k will make the quiescent output offset voltage about 1V. The output dynamic range will be 0.6V to 3V. Input capacitive coupling will increase the needed dynamic range of the amplifier. The standard NTSC video signal is 1V peak to peak plus 143mV for the color AC peak. The video signal is made up of the -286mV sync pulse plus the 714mV picture signal which may very from 0V to 714mV. The video signal average value for a black picture is about 28mV (Figure 2) and with a white picture level is about 583mV (Figure 3). This gives a maximum change in average value of about 555mV. A direct coupled amplifier with a standard NTSC video signal needs a dynamic range of 1.143V. But with input capacitance coupling the dynamic range requirements are the sum of the 1.143V video plus the average picture value change of 0.555V or 1.698VP-P. At a gain of two this doubles to 3.394V. These amplifiers do not have this much dynamic range so a gain of less than 2 must be used to avoid waveform compression under all conditions. Capacitively coupling the input and output is worse than a capacitor only on the input. Without any special compromises you can only take a gain of one. But if the backmatch resistor is reduced to 36, reducing the output
0.1F CB VIN 4.7K
0.32VB 68K RA +
RB RIS 75
AMP
0.64VB
V AMP RPD 250
75 RO
VOUT
1V RCL +0.348 +0.062 1.8V offset Amp Out Volts +3.172 +1.8 +1.172
1K RF + - Video 1V + - V1 5V RIL RG 1K 75
FIGURE 1. VIDEO PATH
Gain = 2 Y10s 0.714V 0.6 0.0V -0.286V 1.3s 3.8s 5.1s 0.867 53s 0.583V 0 -0.572 1.428 1.166
FIGURE 2. WHITE LEVEL VIDEO
Gain = 2
0.714V 53mV 0.0V -0.286V Average Picture Value Change -- 555mV Average BL +45mV 0.686V +28mV +56mV
FIGURE 3. BLACK LEVEL VIDEO
5
75
1.8V offset Amp OutVolts 2.062 1.8
EL2110
range requirement 25% and the output offset is shifted to 2.1V you can take a gain of 1.5 and have a standard NTSC 1V at the 75 load. A simple transistor, capacitor and resistor sync tip clamp may be used when the input is already AC coupled to set the sync tip to ground. This gives the input a fixed DC level and can be used like a direct coupled input. The clamp uses a PNP transistor with the collector at ground and the base has a 200k resistor to 5V. The emitter connects to the amplifier input and a capacitor from the video input. The clamp functions as an inverted Beta current source for input bias current with plus inputs and a clamp to ground for minus inputs. The RA and RB resistors are removed for the clamp option (Figure 4).
Printed Circuit Layout
The EL2110 is well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any high frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1F ceramic capacitor is recommended for bypassing both supplies. Pin lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5k because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance.
2N3904 Clamp Option PNP
200K RC 12K
1.4VB 47F 0.1F CB + 4.7K
RA 47F VOUT
CI VIN
AMP RB -
2.1VB
V AMP RPD
36 RO
1V RCL
CO 75
1K RIS 75 RF RIL + - RG 2K 75 5V V1
+ Video - 1V
FIGURE 4.
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