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TC7136CLW Datasheet(PDF) 11 Page - TelCom Semiconductor, Inc |
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TC7136CLW Datasheet(HTML) 11 Page - TelCom Semiconductor, Inc |
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11 / 12 page  3-257 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 V – ANALOG COMMON TC7136 TC7136A VREF + 32 35 36 26 240 k Ω 10 k Ω VREF – VREF 1 + 9V SET VREF = 1/2 VFULL SCALE V + analog common is a very stable potential with excellent temperature stability (typically 35 ppm/ °c). for TC7136A This potential can be used to generate the TC7136A's reference voltage. An external voltage reference will be unnecessary in most cases because of the 35 ppm/ °C temperature coefficient. See TC7136A Internal Voltage Reference discussion. TEST (Pin 37) The TEST pin potential is 5V less than V+. TEST may be used as the negative power supply connection for external CMOS logic. The TEST pin is tied to the internally-generated negative logic supply through a 500 Ω resistor. The TEST pin load should not be more than 1 mA. See the Applications Section for additional information on using TEST as a negative digital logic supply. If TEST is pulled high (to V+), all segments plus the minus sign will be activated. DO NOT OPERATE IN THIS MODE FOR MORE THAN SEVERAL MINUTES. With TEST = V+, the LCD segments are impressed with a DC voltage which will destroy the LCD. TC7136A Internal Voltage Reference The TC7136 analog common voltage temperature sta- bility has been significantly improved (Figure 9). The "A" version of the industry-standard TC7136 device allows users to upgrade old systems and design new systems without external voltage references. External R and C val- ues do not need to be changed; however, noise perfor- mance will be improved by increasing CAZ. (See Auto-Zero Capacitor section.) Figure 10 shows analog common sup- plying the necessary voltage reference for the TC7136/A. Figure 9. Analog Common Temperature Coefficient Decimal Point and Annunciator Drive The TEST pin is connected to the internally-generated digital logic supply ground through a 500 Ω resistor. The TEST pin may be used as the negative supply for external CMOS gate segment drivers. LCD annunciators for decimal points, low battery indication, or function indication may be added without adding an additional supply. No more than 1 mA should be supplied by the TEST pin: its potential is approximately 5V below V+. TYPICAL GUARANTEED MAXIMUM TYPICAL GUARANTEED MAXIMUM TYPICAL NO MAXIMUM SPECIFIED 200 180 160 140 120 100 80 60 40 20 0 TC7136 TC7136A ICL7136 Figure 10. TC7136A Internal Voltage Reference Connection APPLICATIONS INFORMATION Liquid Crystal Display Sources Several manufacturers supply standard LCDs to inter- face with the TC7136A 3-1/2 digit analog-to-digital con- verter. Representative Manufacturer Address/Phone Part Numbers* Crystaloid 5282 Hudson Dr. C5335, H5535, Electronics Hudson, OH 44236 T5135, SX440 216-655-2429 AND 720 Palomar Ave. FE 0201, 0501 Sunnyvale, CA 94086 FE 0203, 0701 408-523-8200 FE 2201 VGI, Inc. 1800 Vernon St. Ste. 2 I1048, I1126 Roseville, CA 95678 916-783-7878 Hamlin, Inc. 612 E. Lake St. 3902, 3933, 3903 Lake Mills, WI 53551 414-648-2361 *NOTE: Contact LCD manufacturer for full product listing/specifications. LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7136 TC7136A |
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Similar Description - TC7136CLW |
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