ALFA RPAR K1100CK2B Sample and Hold (TO5-8)

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The ALFA RPAR K1100CK2 is a monolithic sample-and-hold (SHA) circuit. Controlled by a logic signal, this device stores the instantaneous values of the input signal and for a certain time, maintains a constant DC voltage at the output with a high accuracy. The wide bandwidth allows the K1100CK2 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 10¹⁰Ω allows high source impedances to be used without degrading accuracy.

The overall design ensures no feedthrough from input to output in the hold mode, even for input signals equal to the supply voltages. Logic inputs on the K1100K2 are fully differential with low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is 1.4 V. The 1100CK2 will operate from ±5V to ±15V supplies.

The K1100CK2 OUTPUT tracks the INPUT signal by charging and discharging the hold capacitor (CH). The OUTPUT can be held at any given time by pulling the LOGIC input low relative to the LOGIC REFERENCE voltage and resume sampling when LOGIC returns high. Additionally, the OFFSET pin can be used to zero the offset voltage present at the INPUT.

Features

• Supply voltages ±15V (B suffix),
• Less than 7 µsec sampling time with an error of 0.1% at CH = 1000 pF
• Less than 180 nsec aperture delay
• External hold capacitor
• Output short-circuit protection
• Control input compatibile with TTL / CMOS logic

References