ac or dc Signal Coupling Wide Bandwidth...>200 khz High Transfer-Gain Stability...±0.0%/ C 00 V Peak Isolation UL Approval Pending Applications Power-Supply Feedback Medical-Sensor Isolation Opto Direct-Access Arrangement (DAA) Isolated Process-Control Transducers SOES09A OCTOBER 99 REVISED JULY 996 LEDK LEDA PDK PDA P PACKAGE (TOP VIEW) 2 8 7 6 NC NC PDK2 PDA2 NC No internal connection description The TIL00 precision linear optocoupler consists of an infrared LED irradiating an isolated feedback photodiode and an output photodiode in a bifurcated arrangement. The feedback photodiode captures a percentage of the flux of the LED and generates a control signal that can be used to regulate the LED drive current. This technique is used to compensate for the nonlinear time and temperature characteristics of the LED. The output-side photodiode produces an output signal that is linearly proportional to the servo-optical flux emitted from the LED. A typical application circuit (shown in Figure ) uses an operational amplifier as the input to drive the LED. The feedback photodiode sources current through R, which is connected to the inverting input of the input operational amplifier. The photocurrent I P assumes a magnitude that satisfies the relationship I P = V I /R. The magnitude of the current is directly proportional to the LED current through the feedback transfer gain K(V I /R = K I F ). The operational amplifier supplies LED current to produce sufficient photocurrent to keep the node voltage V b equal to node voltage V a. TIL00 VI R Va Vb VCC _ VCC P R 2 IF VCC K K2 6 2VCC 2VCC VO = K(R2/R) VI P IP IP2 R2 2VCC NOTES: A. B. K is servo current gain, the ratio of the feedback photodiode current (IP) to the input LED current (IF), i.e. K = IP/IF. K2 is forward gain, the ratio of the output photodiode current (IP2) to the input LED current (IF), i.e. K2 = IP2/IF. C. K is transfer gain, the ratio of the forward gain to the servo gain, i.e. K = K2/K. Figure. Typical Application Circuit Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 996, Texas Instruments Incorporated POST OFFICE BOX 60 DALLAS, TEXAS 726
SOES09A OCTOBER 99 REVISED JULY 996 Terminal Functions TERMINAL NAME NO. I/O LEDK LED cathode LEDA 2 LED anode PDK Photodiode cathode PDA Photodiode anode PDA2 Photodiode 2 anode PDK2 6 Photodiode 2 cathode NC 7 No internal connection NC 8 No internal connection DESCRIPTION absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Emitter Continuous total power dissipation (see Note )............................................. 60 mw Input LED forward current, I F.............................................................. 60 ma Surge current with pulse width < 0 µs..................................................... 20 ma Reverse voltage, V R........................................................................ V Reverse current, I R....................................................................... 0 µa Detector Continuous power dissipation (see Note 2).................................................. 0 mw Reverse voltage, V R....................................................................... 0 V Coupler Continuous total power dissipation (see Note )............................................. 20 mw Storage temperature, T stg......................................................... C to 0 C Operating temperature, T A........................................................ C to 00 C Input-to-output voltage............................................................... Vpeak Lead temperature,6 mm (/6 inch) from case for 0 seconds............................... 260 C Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES:. Derate linearly from 2 C at a rate of 2.66 mw/ C. 2. Derate linearly from 2 C at a rate of 0.66 mw/ C.. Derate linearly from 2 C at a rate of. mw/ C. 2 POST OFFICE BOX 60 DALLAS, TEXAS 726
SOES09A OCTOBER 99 REVISED JULY 996 electrical characteristics at T A = 2 C Emitter VF Forward voltage IF = 0 ma.2.0 V Temperature coefficient of VF 2.2 mv/ C IR Reverse current VR = V 0 µa tr Rise time IF = 0 ma, IF = 2 ma µs tf Fall time IF = 0 ma, IF = 2 ma µs Cj Junction capacitance VF = 0, f = MHz pf Detector IDK Dark current VR = V, IF = 0 2 na Open circuit voltage IF = 0 ma 0. V IOS Short circuit current limit IF = 0 ma 80 µa Cj Junction capacitance VF = 0, f = MHz 2 pf Coupler K Servo current gain K2 Forward current gain K Transfer gain K# BW tr tf Viso Gain temperature coefficient Transfer gain linearity Bandwidth Rise time Fall time Peak Isolation voltage TIL00 TIL00A K/K2 K IF = ma 0.% 0.7%.% IF = 0 ma 0.%.2% 2% IF = ma 0.% 0.7%.% Detector bias IF = 0 ma 0.%.2% 2% voltage = V IF = ma 0.7.2 IF =0mA IF = 0 ma 0.7.2 IF = ma 0.9.0 IF = 0 ma 0.9.0 0. ±0.00 IF = to 0 ma ±0.2% IF = to 0 ma, TA = 0 to 7 C ±0.% IF = 0 ma, IF = 0 ma, IF = 0 ma, IIO = 0 µa, time = minute RL = kω, RL = kω, RL = kω, f = 60 Hz %/ C 200 khz.7 µs.7 µs V This symbol is not currently listed within EIA or JEDEC standards for semiconductor symbology. Servo current gain (K) is the ratio of the feedback photodiode current (IP) to the input LED current (IF) current (IF), i.e. K = IP/IF. Forward gain (K2 is the ratio of the output photodiode current (IP2) to the input LED current (IF), i.e. K2 = IP2/IF. Transfer gain (K) is the ratio of the forward gain to the servo gain, i.e. K = K2/K. # Transfer gain linearity ( K) is the percent deviation of the transfer gain K as a function of LED input current (IF) or the package temperature. POST OFFICE BOX 60 DALLAS, TEXAS 726
SOES09A OCTOBER 99 REVISED JULY 996 P (R-PDIP-T8) MECHANICAL DATA PLASTIC DUAL-IN-LINE PACKAGE 0.00 (0,60) 0. (9,02) 8 0.260 (6,60) 0.20 (6,0) 0.070 (,78) MAX 0.020 (0,) MIN 0.0 (7,87) 0.290 (7,7) 0.200 (,08) MAX Seating Plane 0.2 (,8) MIN 0.00 (2,) 0 0.02 (0,) 0.0 (0,8) 0.00 (0,2) M 0.00 (0,2) NOM 00082/ B 0/9 NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Falls within JEDEC MS-00 POST OFFICE BOX 60 DALLAS, TEXAS 726
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