EL2257C Elantec Semiconductor, EL2257C Datasheet
EL2257C
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EL2257C Summary of contents
Page 1
... The EL2257C/EL2357C have a high speed disable feature. Applying a low logic level to all ENABLE pins reduces the supply current to 0 µA within 50 ns. Each amplifier has its own ENABLE pin. This is useful for both multiplexing and reducing power consumption ...
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... 25°C and QA sample tested 25° MAX = 25°C for information purposes only. A =1.5V, V =+5V, V =+5V, unless otherwise specified. CLAMP ENABLE Test Conditions EL2257C EL2357C Measured from Tmin to Tmax V = =0V IN Measured from Tmin to Tmax V =V =+2.7V to +12V, S ENABLE V =OPEN CLAMP VCM= ...
Page 3
... IL-CL Amplifier 1. Internal short circuit protection circuitry has been built into the EL2257C/EL2357C. See the Applications section the disable feature is not desired, tie the ENABLE pins to the V 3. The maximum output voltage that can be clamped is limited to the maximum positive output Voltage inactivates the clamp ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Closed Loop AC Electrical Characteristics V =+5V, GND=0V, T =25°C, V =+1.5V OUT [1] unless otherwise specified Parameter Description Bandwidth (Vout=400 mVp-p) BW ±0.1 dB Bandwidth (Vout=400 mVp-p) GBWP Gain Bandwidth Product PM Phase Margin SR Slew Rate t ,t Rise Time, Fall Time ...
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... Typical Performance Curves Non-Inverting Frequency Response (Gain) Inverting Frequency Response (Gain) Frequency Response for Various R L EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Non-Inverting Frequency Response (Phase) Inverting Frequency Response (Phase) Frequency Response for Various Bandwidth vs Temperature for Non-Inverting Gains ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps 3 dB Bandwidth vs Supply Voltage for Non-Inverting Gains 3 dB Bandwidth vs Supply Voltage for Inverting Gains Open Loop Gain and Phase vs Frequency Frequency Response for Various Supply Voltages Frequency Response for Various Supply Voltages ...
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... Large Signal Step Response +3V S Small Signal Step Response Slew Rate vs Temperature EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Large Signal Step Response +5V S Large Signal Step Response ±5V S Settling Time vs Settling Accuracy 7 Large Signal Step Response +12V S Voltage and Current Noise ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Differential Gain for Single Supply Operation 2nd and 3rd Harmonic Distortion vs Frequency Output Voltage Swing vs Frequency for THD < 0.1% Differential Phase for Single Supply Operation 2nd and 3rd Harmonic Distortion vs Frequency Output Voltage Swing vs Frequency for Unlimited ...
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... Supply Voltage (per amplifier) Offset Voltage vs Die Temperature (4 Samples) Positive Output Voltage Swing vs Die Temperature 150 to GND L EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Supply Current vs Die Temperature (per amplifier) Input Bias Current vs Input Voltage Negative Output Voltage Swing vs Die Temperature, ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps IClamp Accuracy R = 150 L Enable Response for a Family of DC Inputs Disable/Enable Response for a Family of Sine Waves Clamp Accuracy Disable Response for a Family of DC Inputs OFF Isolation 10 Clamp Accuracy ...
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... EL2257 Channel to Channel Isolation vs Frequency 14-Lead Plastic DIP Maximum Power Dissipation vs Ambient Temperature EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps EL2357 Channel to Channel Isolation vs Frequency 16-Lead Plastic SO Maximum Power Dissipation vs Ambient Temperature 11 14-Lead Plastic SO Maximum Power Dissipation vs Ambient Temperature 16-Lead Plastic DIP ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps Simplified Schematic (One Channel) 12 ...
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... So, for example single +5V supply, the EL2257C/EL2357C have an input range which spans from 0V to 3.8V. The output range of the EL2257C/EL2357C is also quite large. It includes the negative rail, and extends to within 1V of the top supply rail with supply, the output is therefore capable of swinging from 0V to +4V. On split supplies, the output will swing ± ...
Page 14
... If your application requires that the output goes to ground, then the output stage of the EL2257C/EL2357C, like all other single supply op amps, requires an external pull down resistor tied to ground. As mentioned above, the current flowing through this resistor becomes the DC bias current for the output stage NPN transistor ...
Page 15
... EL2257C have their own CLAMP pin, so individual clamp levels may be set, whereas a single CLAMP pin controls the clamp level of the EL2357C. Figure 1 below is the EL2257C with each amplifier unity gain connected. Amplifier A is being driven Vp-p sinewave and has 2.25V applied to CLAMPA, while amplifier B is driven Vp-p triangle wave and 1 ...
Page 16
... V pin. S+ EL2257C/EL2357C Comparator Application The EL2257C/EL2357C can be used as a very fast, sin- gle supply comparator by utilizing the clamp feature. Most op amps used as comparators allow only slow speed operation because of output saturation issues. However, by applying a DC voltage to the CLAMP pin of the EL2257C/EL2357C, the maximum output voltage can be clamped, thus preventing saturation ...
Page 17
... Since the sync tip contains no use- ful video information and negative going pulse, we can chop it off. Figure 7 shows a unity gain connected amplifier EL2257C. Figure 8 shows the com- plete input video signal applied at the input, as well as the output signal with the negative going sync pulse removed ...
Page 18
... Therefore important to cal- culate the maximum junction temperature for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the EL2257C/EL2357C to remain in the safe operating area. The maximum power dissipation allowed in a package is determined by: T – ...
Page 19
... EL2257C/EL2357C Macromodel (one channel) * Revision A, October 1995 * Pin numbers reflect a standard single opamp. * When not being used, the clamp pin, pin 1, * should be connected to Vsupply, pin 7 * Connections: +input * | -input * | | +Vsupply * | | | * | | | * | | | * | | | .subckt EL2257/ Input Stage * 250µ 250µ ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps .model qn npn(is800e-18 bf150 tf0.02nS) .model qpa pnp(is810e-18 bf50 tf0.02nS) .model qp pnp(is800e-18 bf54 tf0.02nS) .model da d(tt0nS) .ends 20 ...
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... EL2257C/EL2357C 125 MHz Single Supply, Clamping Op Amps General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir- cuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement ...