TL490C TI | Alldatasheet

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CIRCUITS BULLETIN NO.DL-§ 12677, JUNE 1979 — REVISED OCTOBER 1979 © 10 Comparators to Digitize Analog JOR N DUAL-IN-LINE PACKAGE Input Signals (TOP view) © Cascade Feature Allows Stacking —_l—" Output Display Strings ow [1] | 1] 08 i, ] I © Threshold Intervals Adjustable from aro @ 200 mV to 100 mV i] Ls] [| IT © Open-Collector Outputs Capable of vec [3 | [14] 0° Sinking up to 40 mA and Withstanding 1 1 up to 32 V annoos [4 | [13] oxo l} {I © Supply Voltage Range of 10 to 18 V pply Voltage Range onsuee | [a] = description l l Twacaeer L6 | [1] o The TL490C consists of ten comparators and a J f reference voltage network to detect the level of wi] | 10] 0» a signal at the analog input. Output Q1 is switched aH H to a low logic level at a typical input voltage of 200 [| [s] « millivolts with Threshold-Adjust open and the cascade ——— input grounded. After each 200-millivolt increment, NC-Neo interns! connection the next output is switched to a low logic level, All outputs are at low logic levels at a typical input voltage of 2000 millivolts. The threshold-adjust terminal allows the user to decrease the input voltage steps from 200-millivolt to 100-millivolt increments by connecting an external resistor from Threshold Input to ground. This level detector is directly cascadable requiring only two external resistors, The maximum number of devices that can be cascaded is determined by the threshold level and the maximum input voltage. See Figure 4 in Typical Applica. tion Data. If the cascade feature is not utilized, the cascade input must be grounded for proper operation. The TL490C is especially designed to detect and indicate analog signal levels and may be used in various industrial, 1s | consumer, or automotive applications such as low-precision meters, warning-signal indicators, A/D converters, feedback regulators, pulse shapers, delay elements, and for automatic range switching. The open-collector outputs are capable of sinking currents up to 40 milliamperes and may be operated at voltages up to 32 volts. The power outputs are suitable for driving a variety of display elements such as LED's or filament lamps. The outputs may also drive digital integrated logic such as TTL, CMOS, or other high-level logic. The TL490C is characterized for operation from 0°C to 70°C. functional block diagram o @ i i ace re 1NPUT > ‘ONLY puntos (6 H m0 eur a H cette, t ‘SHOWN rnesHo.0 (8 ry | ‘toust | fa mon ‘ we, =o ipa Resistor values shown are nominal. ‘Copyright © 1979 by Texas Instruments Incorporated 1070 Texas INSTRUMENTS 349 INCORPORATED POST OFFICE OX 226012 # DALLAS, TEXAS 75265,

absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, Vcc (see Note 1)... eee eee eee eee e eee eeeeeeee eee eneees 20V Input voltage: Analog input... eee eee eee eect ee ereteeeseeees BV Off-state outputvoltage ese eevee ee ccecssrtectrrrssttttttttttterestsrses, 40V On-state output current (each output)... eee cece cece teen cette eeeeeee es 60MA Operating free-air temperature range 6. eee cece e eect ents eeeeees OC to 70°C Storage temperature range... ee eee ee ee eee teen teen tees eens =65°C to 150°C NOTES: 1. Voltage values are with respect to network ground terminal 2. For operation above 25°C free-air temperature, refer to Dissipation Derating Table. In the J package, chips ere glass: mounted. DISSIPATION DERATING TABLE PACKAGE POWER OERATING ABOVE RATING FACTOR Ta J (Glass-Mounted Chip) 1025mW 8.2 mW/>'C 25°C N 1150mW 9.2 mw/°C 25°C Also see Dissipation Derating Curves, Section 2. recommended operating conditions MIN NOM MAX UNIT Supply voltage, VEG. eee e eee eeeeeeeeeeeseees 10°12 18 OV Output voltage, VQ... eee e cece eee enna ee 32 «V To cr 40 mA Operating free-air temperature, TA ©... eee cece cece eee e eens [) 70 °C electrical characteristics over recommended operating free-air temperature and supply voltage ranges, pin 5 at gnd, pin 6 open (unless otherwise noted) [ ranamereR TT testconprrions | min tye? wax | unit | 125 200 275 | Switeningo2 | 325 400__475 525 600__675 Positive-going threshold [Switching 5 | = 28° vte voltage at input A Tanase mv 1525 __1600_1675 1925 2000-2075 [Wre= Vr Inputthysteresis tv 'oH High-level output current [Vow=32v_ [os 200 wa | vy Low-level output volta Fo = 10 mA [| one oa oF minerouenenee [seems Fes Winay Fs if 8 ; Vec=12V, ee ‘ce Svpnty curent ailourputs open [80a | TAI typical values are at Voc = 12 V and Ta = 25°C CS 1079

350 TEXAS INSTRUMENTS

POST OFFICE BOX 225012 © DALLAS, TEXAS 75205

10-STEP ADJUSTABLE ANALOG LEVEL DETECTOR ee TYPICAL CHARACTERISTICS THRESHOLD VOLTAGE INTERVAL LOW-LEVEL OUTPUT VOLTAGE. THRESHOLD-ADJUST RESISTANCE OUTPUT CURRENT ° a a aaa “4 ee aol eee CAT TTT 3 go 2 CET A Sof MATTE TTT a Zan § 20 a oft} te & 100 LA CT 8 0o7-——+ + ae 2 eof TT TT Tg oe col LUN TTT TT 3 ie Dene te ee aes £ 0. 100 400 1k 4k 10k 40k 100k 1 2 4 7 10 20 40 Radj—Threshold-Adjust Resistance—2 \\g—Output Current—mA TYPICAL APPLICATION DATA | , Vee ai (OPEN) © THRES a2 a4) TL490C a5) ANALOGS ANALOG 7] INPUT INPUT oe Q10} GND TT syvsseees<c—c—O—OE _ TEXAS INSTRUMENTS 351

i TYPICAL APPLICATION DATA wv ct vi a cc oa THRES THRES (OPEN) © ‘ADS a ° ADS a2 a3 ce os os bel TLA9OC bed OUTPUTS os a5 a7] or ANALOG ANaLoc ANALOG Gy 2000 INPUT wNPUT as INPUT NEXT STAGE: 09 os ‘CASCADE INPUT CASCADE CASCADE [ input 270) ‘inpor, o70 4002 = 400 2: ANALOG INPUT To cascade three TL490C detectors, parallel all analog Inputs, connect cascade Input 1 to ground, blas cascade input 2 to 2 volts (or 10 times the threshold Interval), end blas cascade Input 3 t0 4 volts (or 20 times the threshold Interval). This provides drive for 30 output steps with one continuous O- to 6volk Input. The maximum number of devices that can be casceded is determined by the threshold lavel end the maximum Input voltage rating. av FIGURE 4~CASCADING ANALOG LEVEL DETECTORS riuz80 , 500 0 vi EACH co Gy a ‘cc TLa90C bad o ANALOG Tuc our i WALOG gs os no [CASCADE UNPUT a oa IHRESHOLO ADJUST os) aro 08 no. 0.84 —(Ragj + 700.2) # 2240.2 533 VT EE ior ag) # vr 700 2 Ragj 1 0.2-Vr where: Vz = threshold vottage interval, V Alternatively, Rag) can be ertimeted using Figure 1. In the circuit shown with Rygj = 500 9, Vz 100 mV. FIGURE 5-LINEAR HALL-EFFECT SENSOR WITH 10.STEP ANALOG LEVEL INDICATOR i 1079

352 Texas INSTRUMENTS

INCORPORATED. POST OFFICE BOX 226012 © DALLAS, TEXAS 75265,