Alexander Strong Kevin R. Hoskins ® m m V+ 1/4 LTC201 A 13 15 4 14 1 MCT2† V+ 2 + 1/2 LT1464 6 VIN B 7 6 4 8 5 3 + 6 4 1 VOUT 0.5pA = 0.05mV/s 10nF TOTAL SUPPLY CURRENT = 460µA MAX * R1 = 600 FOR ±15V SUPPLIES R1 = 0 FOR ±5V SUPPLIES † MOTOROLA (602) 244-5768 TYPICAL DROOP = 4 V– 2 5 – 1/2 LT1464 2 1 2 R1* † 1 MCT2 – 1/4 LTC201 MODE IN A IN B Track 0 0 Hold 1 1 Positive Peak Det Reset 0 0 Store 0 1 Negative Peak Det Reset 0 0 Store 1 0 LTC®201 switch is open for logic "1" 5 V– 5 FUNCTION Track-and-Hold C1 10nF POLYSTYRENE 16 3 DN136 F01 09/96/136 m – 1.6 AMP 3 DC OUTPUT (V) – 1.4 ––– ––– ––– – 1.2 – 1.0 – 0.8 – 0.6 – 0.4 – 0.2 0 10 –11 10 –9 10 –7 10 –5 PHOTODIODE CURRENT (A) 10 –3 DN136 F03 R8 100k Q1 2N3904 D1 1N4148 R1 100 PHOTODIODE C6 1µF 5V 2 3 – 8 AMP 1 1/2 LT1462 + 4 –5V C1 1nF 1 R2 24k C2 200pF 5 6 + AMP 2 1/2 LT1462 – 7 R4 10M R5 24k C5 200pF 3 2 AMP 3 1/2 LT1462 D2 1N4148 R3 100k C3 DC 0.47µF 1 OUT + – 5V R7 10M D3 1N4148 R9 1M R10 50k 5 6 + – R6 100k 7 4 – 5V R12 10k C4 10µF 8 AMP 4 1/2 LT1462 R11 1M AC OUT R13 10k DN136 F02 0998 4K• PRINTED IN JAPAN ª LINEAR TECHNOLOGY CORPORATION 1996