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Part: EL2421CN
Category:
Multimedia
-> Video
-> Amplifiers
-> Preamp/Amp
Description: Quad, Low Cost, Gain of 2, Video op Amp
Company: Elantec Semiconductor, Inc. (acquired by Intersil)
Datasheet: Download EL2421CN datasheet File size : 7 kB
Request For quote: Find where to buy EL2421CN
Datasheet text preview:
EL2421C
EL2421 C
Quad, Low Cost, Gain of 2, Video Op Amp
Features
· · · · · · Optimized for 5V operation Stable at gain of 2 100 MHz Gain bandwidth product 130 V/µs slew rate Drives 150 load to video levels Input and outputs operate at negative supply rail · -60 dB isolation at 4.2 MHz
General Description
The EL2421C operational amplifier, built using Elantec's complem e n t a r y 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 +2 the EL2421C will drive a 150 load to +2V, with a bandwidth of 100 MHz . This device achieves 0.1 dB bandwidth at 5 MHz. 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 2.4 mA of supply current.
Applications
· · · · Consumer video amplifier Active filters/integrators Cost sensitive applications Single supply amplifiers
Connection Diagram
Ordering Information
Part No EL2421CN EL2421CS Temp. Range -40°C to +85°C -40°C to +85°C Package 14-lead P-DIP 14-lead SO Outline # MDP0031 MDP0027
P-DIP, SO
April 1998 Rev B
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 1997 Elantec, Inc.
EL2421C
EL24 21C
Quad, Low Cost, Gain of 2, Video Op Amp
Absolute Maximum Ratings (T
Total Supply Voltage Input Voltage Differential Input Voltage Peak Output Current
A
= 25 °C)
18V -6VS 6V 75 mA per amplifier
Power Dissipation Storage Temperature Range Operating Temperature Range
See Curves -65°C to +150°C -40°C to +85°C
Important Note: All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually performed during production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefor TJ = TC = TA. Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX0002. 100% production tested at TA = 25°C and QA sample tested at TA = 25°C, TMAX and TMIN per QA test plan QCX0002. QA sample tested per QA test plan QCX0002. Parameter is guaranteed (but not tested) by Design and Characterization Data. Parameter is typical value at TA = 25°C for information purposes only.
DC Characteristics
VS=+5V, RL=1K , VIN=1V, TA=25°C unless otherwise specified. Parameter VOS TCVOS IB IOS TCIOS AVOL PSRR CMRR CMIR VOUT ISC IS RIN CIN ROUT PSOR Description Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Offset Current Average Offset Current Drift Open Loop Gain Power Supply Rejection Ratio Common Mode Rejection Ratio Common Mode Input Range Output Voltage Swing Output Short Circuit Current Supply Current Input Resistance Input Capacitance Output Resistance Power Supply Operating Range Single Supply 4 RFB = RG = 1K, RL = 150 Output to Ground Differential Common Mode AV = +1 @ 10 MHz
[2] [1] [1]
Conditions
Min -20 -15 -1 160 160 43 60 0.0 2.8 75 2.0
Typ 10 -50 -7 0.3 -3 250 250 50 65
Max 20 -3 1.0
Test Level I V I I V I V I I
Units mV µ V/°C µA µA nA/°C V/V V/V dB dB V V mA mA K M pF V
VOUT=..5, 2.5, RL= 1K VOUT=..5, 2.5, RL= 150K VS = 4.5V to 5.5V VCM = 0V to +3.8V
3.0 3.2 125 2.4 150 1.5 1 0.150 6 3.0
I I I I V V V V V
No Load (per channel) VIN = 0V
1. Measured from TMIN to TMAX. 2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.
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EL2421C
EL24 21C
Quad, Low Cost, Gain of 2, Video Op Amp
Closed Loop AC Electrical Characteristics
VS=5V, AC Test Figure, TA = 25°C unless otherwise specified Parameter BW GBWP PM SR FBWP tR, tF OS tPD tS dG dP eN iN CS Description -3dB Bandwidth (VOUT = 0.4 mVp-p) ±0.1 dB Bandwidth (VOUT = 0.4 mVp-p) Gain Bandwidth Product Phase Margin Slew Rate Full Power Bandwidth Rise Time, Fall Time Overshoot Propagation Delay Settling to 0.1% (AV = 1) Differential Gain Differential Phase
[2] [2] [1]
Conditions AV = +1 AV = +1
Min
Typ 100 10 50 55
Max
Test Level V V V V V V V V V V V V V V V
Units MHz MHz MHz (°) V/µ s MHz ns % ns ns % (°) nV/rt(Hz) nV/rt(Hz) dB
85 8 0.1V step 0.1V step VS = 5V, 2V Step NTSC/PAL NTSC/PAL 10 KHz 10 KHz P = 5 MHz
130 11 2 15 3.5 80 0.1 0.2 15 1.5 55
Input Noise Voltage Input Noise Current Channel Separation
1. For VS = 5V, VOUT = 4Vpp. 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
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EL2421C
EL24 21C
Quad, Low Cost, Gain of 2, Video Op Amp
Typical Performance Curves
14-Pin Plastic DIP Maximum Power Dissipation 14-Lead SO Maximum Power Dissipation
Simplified Block Diagram
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EL2421C
EL24 21C
Quad, Low Cost, Gain of 2, Video Op Amp
Applications Information
Product Description
The EL2421C 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 c o st of more flexible and sophisticated products are prohibitive.
Single 5 Volt 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.3V and .5V. With RA=68K and RB=4.7K the input offset will be .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 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 ou t p u t offset voltage about 1V. The output dynamic range will be .6V to 3V.
Power Supplies
The EL2421C is designed to work at a supply voltage difference of 4.5V to 5.5V. It will work on any combinat i o n of ± 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 200 mV of VS- .
Output Drive Capability
This device does not have short circuit protection. Each output is capable of than 100 mA into a shorted output. Care must be used in the design to limit the output current with a series resistor.
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