George Feliz ® µ µ µ µ µ µ µ ––– √ ® 5V + 0.01µF 7 0.1µF 4 – 5 0.01µF 10µF Q1 2N3906 1 2 – 5V 3 4 10k 5 6 10k – 5V 10µF 0.1µF 0.1µF 6 LT1351 2 – 5V 10µF 7 8 9 10 11 12 LTC1274 AIN VCC VREF VSS AGND BUSY D11 (MSB) CS D10 RD D9 CONVST D8 SLEEP D7 REFRDY D6 D0 D5 D1 D4 D2 DGND D3 24 23 22 21 20 19 18* PROCESSOR I/O COMMAND LINES 17 16 15 14 *SLEEP SHUTS DOWN CIRCUIT TO 19µA 13 DN148 F01 02/97/148 DATA BITS D0 TO D11 TOTAL HARMONIC DISTORTION + NOISE (%) ANALOG 3 INPUT 5V 0.1 0.01 0.001 0.1 1 10 FREQUENCY (kHz) 50 DN148 F02 µ µ µ µ R1 50k R2 5k – 1/2 LT1352 R4 50k R3 5k – 1/2 LT1352 + – VOUT + VIN µ + GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102 TRIM R5 FOR GAIN TRIM R1 FOR COMMON MODE REJECTION BW = 30kHz 4.64k 5.49k 470pF R5 1.1k DN148 F05 13.3k – VIN 2200pF 1/2 LT1352 + 5.49k 11.3k – 1/2 LT1352 4700pF VOUT + TOTAL HARMONIC DISTORTION + NOISE (%) DN148 F03 0.1 0.01 TOTAL HARMONIC DISTORTION + NOISE (%) 220pF 4.64k 1 0.1 1.25VP-P 2.5VP-P 5VP-P 0.01 10VP-P 20VP-P 0.001 0.02 0.1 1 FREQUENCY (kHz) 10 20 DN148 F06 0.001 0.0001 0.1 1 FREQUENCY (kHz) 10 20 DN148 F04 µ dn148f 0799 5K • PRINTED IN JAPAN LINEAR TECHNOLOGY CORPORATION 1997