Datasheet OP196, OP296, OP496 (Analog Devices) - 15

OP196/OP296/OP496
Amplifiers A2 and A3 are configured in a two op amp instru-
GAIN = 259 200
⍀ mentation amplifier configuration. For ease of measurement,
10-TURNS 5V
the IA resistors are chosen to produce a gain of 259, so that
26.7k
⍀
26.7k
⍀
1/4
each 1°C increase in temperature results in a 10 mV increase in
OP496 1/4 A3
the output voltage. To reduce measurement noise, the band-
V 100
⍀
OUT OP496 RTD
width of the amplifier is limited. A 0.1 µF capacitor, connected
A2 100 2.55M
⍀ ⍀ in parallel with the 100 kΩ resistor on amplifier A3, creates a
392
⍀
392
⍀
100k
⍀ pole at 16 Hz.
1/4 6.17k
⍀
OP496 20k
⍀
100k
⍀
A1 0.1
␮
F AD589 NOTE: 37.4k
⍀
ALL RESISTORS 1% OR BETTER 5V
Figure 12. A Single-Supply RTD Amplifier * OP496 SPICE Macro-model REV. C, 5/95 CIN 1 2 1P * ARG / ADSC * * * GAIN STAGE * Copyright 1995 by Analog Devices, Inc. * * EREF 98 0 POLY(2) (99,0) (50,0) 0 0.5 0.5 * Refer to “README.DOC” file for License Statement. G1 98 15 POLY(2) (6,5) (13,12) 0 10U 10U * Use of this model indicates your acceptance of the R10 15 98 251.641MEG * terms and provisions in the License Statement. CC 15 49 8P * D1 15 99 DX * Node assignments D2 50 15 DX * Noninverting input * * Inverting input * COMMON-MODE STAGE * Positive supply * * Negative supply ECM 16 98 POLY(2) (1,98) (2,98) 0 0.5 0.5 * Output R11 16 17 1MEG * R12 17 98 10 * * .SUBCKT OP496 1 2 99 50 49 * OUTPUT STAGE * * ISY 99 50 20U * INPUT STAGE EIN 35 50 POLY(1) (15,98) 1.42735 1 * Q24 37 35 36 50 QN 1 IREF 21 50 1U QD4 37 37 38 99 QP 1 QB1 21 21 99 99 QP 1 Q27 40 37 38 99 QP 1 QB2 22 21 99 99 QP 1 R5 36 39 150K QB3 4 21 99 99 QP 1.5 R6 99 38 45K QB4 22 22 50 50 QN 2 Q26 39 42 50 50 QN 3 QB5 11 22 50 50 QN 3 QD5 40 40 39 50 QN 1 Q1 5 4 7 50 QN 2 Q28 41 40 44 50 QN 1 Q2 6 4 8 50 QN 2 QL1 37 41 99 99 QP 1 Q3 4 4 7 50 QN 1 R7 99 41 10.7K Q4 4 4 8 50 QN 1 I4 99 43 2U Q5 50 1 7 99 QP 2 QD7 42 42 50 50 QN 2 Q6 50 3 8 99 QP 2 QD6 43 43 42 50 QN 2 EOS 3 2 POLY(1) (17,98) 35U 1 Q29 47 43 44 50 QN 1 Q7 99 1 9 50 QN 2 Q30 44 45 50 50 QN 1.5 Q8 99 3 10 50 QN 2 QD10 45 46 50 50 QN 1 Q9 12 11 9 99 QP 2 R9 45 46 175 Q10 13 11 10 99 QP 2 Q31 46 47 48 99 QP 1 Q11 11 11 9 99 QP 1 QD8 47 47 48 99 QP 1 Q12 11 11 10 99 QP 1 QD9 48 48 51 99 QP 5 R1 99 5 50K R8 99 51 2.9K R2 99 6 50K I5 99 46 1U R3 12 50 50K Q32 49 48 99 99 QP 10 R4 13 50 50K Q33 49 44 50 50 QN 4 IOS 1 2 0.75N .MODEL DX D() C10 5 6 3.183P .MODEL QN NPN(BF=120VAF=100) C11 12 13 3.183P .MODEL QP PNP(BF=80 VAF=60) .ENDS REV. E –15– Document Outline FEATURES APPLICATIONS PIN CONFIGURATIONS GENERAL DESCRIPTION OP196/OP296/OP496--SPECIFICATIONS Electrical Specifications (@Vs = 5.0 V) Electrical Specifications (@Vs = 3.0 V) Electrical Specifications (@Vs = 12.0 V) ABSOLUTE MAXIMUM RATINGS ESD Caution TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION Functional Description Input Overvoltage Protection Output Phase Reversal Input Offset Voltage Nulling Driving Capacitive Loads A Micropower False-Ground Generator Single-Supply Half-Wave and Full-Wave Rectifiers Square Wave Oscillator A 3 V Low Dropout, Linear Voltage Regulator Buffering a DAC Output A High-Side Current Monitor A Single-Supply RTD Amplifier OUTLINE DIMENSIONS Ordering Guide REVISION HISTORY