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ISL59830IA-T13 датащи(PDF) 10 Page - Intersil Corporation |
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ISL59830IA-T13 датащи(HTML) 10 Page - Intersil Corporation |
10 / 14 page 10 FN7489.6 May 4, 2006 Demo Board Schematic Description of Operation and Application Information Theory Of Operation The ISL59830 is a highly practical and robust marriage of three high bandwidth, high speed, low power, rail-to-rail voltage feedback amplifiers with a charge pump, to provide a negative rail without an additional power supply. Designed to operate with a single supply voltage range of from 0V to 3.3V, the ISL59830 eliminates the need for a split supply with the incorporation of a charge pump capable of generating a bottom rail as much as 1.6V below ground; for a 4.9V range on a single 3.3V supply. This performance is ideal for NTSC video with its negative-going sync pulses. The Amplifier The ISL59830 fabricated on a dielectrically isolated high speed 5V Bi-CMOS process with 4GHz PNPs and NPN transistor exceeding 20GHz - perfect for low distortion, low power demand and high frequency circuits. While the ISL59830 utilizes somewhat standard voltage mode feedback topologies, there are many non-standard analog features providing its outstanding bandwidth, rail-to-rail operation, and output drive capabilities. The input signal initially passes through a folded cascode, a topology providing enhanced frequency response essentially by fixing the base collector voltage at the junction of the input and gain stage. The collector of each input device looks directly into an emitter that is tied closely to ground through a resistor and biased with a very stable DC source. Since the voltage of this collector is "locked stable" the effective bandwidth limiting of the Miller capacitance is greatly reduced. The signal is then passed through a second fully- realized differential gain stage and finally through a proprietary common emitter output stage for improved rail- to-rail output performance. The result is a highly-stable, low distortion, low power, and high frequency amplifier capable of driving moderately capacitive loads with near rail-to-rail performance. Input Output Range The three amplifier channels have an input common mode voltage range from 0.15V below the bottom rail to within 100mV of the positive supply, VS+ pin (Note: bottom rail is established by the charge pump at negative one half the positive supply). As the input signal moves outside the specified range, the output signal will exhibit increasingly higher levels of harmonic distortion. And of course, as load resistance becomes lower, the current drive capability of the device will be challenged and its ability to drive close to each rail is reduced. For instance, with a load resistance of 1k Ω the output swing is within a 100mV of the rails, while a load resistance of 150 Ω limits the output swing to within around 300mV of the rails. Amplifier Output Impedance To achieve near rail-to-rail performance, the output stage of the ISL59830 uses transistors in the common emitter configuration, typically producing higher output impedance than the standard emitter follower output stage. The exceptionally high open loop gain of the ISL59830 and local feedback reduces output impedance to less than a 2 Ω at low frequency. However, since output impedance of the device is 1.0µF 1 2 3 4 16 15 14 13 5 6 7 12 11 10 8 9 RIN GIN BIN REF VEE GND VEEOUT DGND ROUT GOUT BOUT VCC EN VCC NC DVCC RED_IN GREEN_IN BLUE_IN R1 75 Ω R2 75 Ω R3 75 Ω VCC REFERENCE CONTROL C4 C2 0.1µF R4 75 Ω R5 75 Ω R6 75 Ω VCC RED_OUT GREEN_OUT BLUE_OUT C3 0.1µF ENABLE 1 3 2 C5 0.1µF VCC 1k Ω 1k Ω 499 Ω Option: Panasonic 120 Ω Bead EXC3BP121H Lower Amp output noise from charge pump R7 R8 R4 VCC D1 1N4148 (or similar) ISL59830 |
Аналогичный номер детали - ISL59830IA-T13 |
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Аналогичное описание - ISL59830IA-T13 |
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