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LF298N Arkusz danych(PDF) 1 Page - NXP Semiconductors |
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1 / 5 page Philips Semiconductors Linear Products Product specification LF198/LF298/LF398 Sample-and-hold amplifiers 879 August 31, 1994 853-0135 13721 DESCRIPTION The LF198/LF298/LF398 are monolithic sample-and-hold circuits which utilize high-voltage ion-implant JFET technology to obtain ultra-high DC accuracy with fast acquisition of signal and low droop rate. Operating as a unity gain follower, DC gain accuracy is 0.002% typical and acquisition time is as low as 6 µs to 0.01%. A bipolar input stage is used to achieve low offset voltage and wide bandwidth. Input offset adjust is accomplished with a single pin and does not degrade input offset drift. The wide bandwidth allows the LF198 to be included inside the feedback loop of 1MHz op amps without having stability problems. Input impedance of 1010 Ω allows high source impedances to be used without degrading accuracy. P-channel junction FETs are combined with bipolar devices in the output amplifier to give droop rates as low as 5mV/min with a 1 µF hold capacitor. The JFETs have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design guarantees no feedthrough from input to output in the hold mode even for input signals equal to the supply voltages. Logic inputs are fully differential with low input current, allowing direct connection to TTL, PMOS, and CMOS; differential threshold is 1.4V. The LF198/LF298/LF398 will operate from ±5V to ±18V supplies. They are available in 8-pin plastic DIP, 8-pin Cerdip, and 14-pin plastic SO packages. FEATURES • Operates from ±5V to ±18V supplies • Less than 10µs acquisition time • TTL, PMOS, CMOS compatible logic input • 0.5mV typical hold step at CH=0.01µF • Low input offset • 0.002% gain accuracy • Low output noise in hold mode • Input characteristics do not change during hold mode • High supply rejection ratio in sample or hold • Wide bandwidth PIN CONFIGURATIONS FE, N Packages D1 Package NOTE: 1. SO and non-standard pinouts. TOP VIEW TOP VIEW 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 14 13 12 11 10 9 V+ OFFSET VOLTAGE INPUT V– NC V+ OUTPUT LOGIC INPUT V– LOGIC REF NC NC NC NC NC LOGIC LOGIC REFERENCE OUTPUT VOS Adj Ch Ch APPLICATION • The LF198/LF298/LF398 are ideally suited for a wide variety of sample-and-hold applications, including data acquisition, analog-to-digital conversion, synchronous demodulation, and automatic test setup ORDERING INFORMATION DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG # 8-Pin Ceramic Dual In-Line Package (CERDIP) -55 °C to +125°C LF198FE 0580A 14-Pin Plastic Small Outline (SO) Package 0 to +70 °C LF398D 0175D 8-Pin Ceramic Dual In-Line Package (CERDIP) 0 to +70 °C LF398FE 0580A 8-Pin Plastic Dual In-Line Package (DIP) 0 to +70 °C LF398N 0404B 8-Pin Ceramic Dual In-Line Package (CERDIP) -25 °C to +85°C LF298FE 0580A 8-Pin Plastic Dual In-Line Package (DIP) -25 °C to +85°C LF298N 0404B |
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