tc850 Microchip Technology Inc., tc850 Datasheet
tc850
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tc850 Summary of contents
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... REF1 REF1 REF OVR/POL 6 35 REF2 L REF2 TC850CPL 8 33 REF + DB7 2 TC850IJL 9 IN+ DB6 DB5 IN- ANALOG 11 30 DB4 COMMON 29 C DB3 12 INTB 28 C DB2 13 INTA DB1 BUFA 26 C DB0 15 BUFB BUSY 16 25 ...
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... In Continuous mode, data is read as three consecutive bytes and manipulation of address lines is not required. Operating from ±5V supplies, the TC850 dissipates only 20 mΩ. The TC850 is packaged in a 40-pin plastic or ceramic dual-in-line package (DIPs) and in a 44-pin plastic leaded chip carrier (PLCC), surface-mount package. ...
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... C Device.......................................0°C to +70°C I Device......................................-25°C to +85°C ≤ 70°C) Package Power Dissipation (T A CerDIP .....................................................2.29Ω Plastic DIP................................................1.23Ω Plastic PLCC ...........................................1.23Ω TABLE 1-1: TC850 ELECTRICAL SPECIFICATIONS Electrical Characteristics ±5V CLK Symbol Parameter Zero Scale Error End Point Linearity Error Differential Nonlinearity ...
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... TC850 TABLE 1-1: TC850 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics ±5V CLK Symbol Parameter C Input Capacitance IN C Output Capacitance OUT T Chip-Enable Access Time CE T Read-Enable Access Time RE T Data Hold From DHC T Data Hold From RD DHR T OVR/POL Data Access Time OP T Low/High Byte Access Time ...
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... MkW WR 25 BUFFER INT 5 INT CONT/DEMAND IN 0.1 μ OVR/POL INT OUT 7 L/H C INT 17 OSC 1 19 TEST 18 OSC 2 21 COMP INTA INTB BUFA BUFB 0.1 0.1 0.1 0.1 0.1 μF μF μF μF μF TC850 +1.6384V +0.0256V 1 μ μ DS21479C-page 5 ...
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... TC850 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table . TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Number (40-Pin Symbol (44-Pin PLCC) PDIP/CERDIP CONT/ DEMAND 6 7 OVR/POL DB7 9-15 10-17 DB6-DB0 16 18 BUSY 17 19 ...
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... Negative connection for V reference capacitor. REF2 Negative input for reference voltages. – Negative connection for V reference capacitor. REF1 + Positive connection for V reference capacitor. REF1 + Positive input for REF1 Positive power supply connection, typically +5V TC850 . ( /64) REF2 REF2 REF1 DS21479C-page 7 ...
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... TC850 3.0 DETAILED DESCRIPTION The TC850 is a multiple-slope, integrating A/D con- verter (ADC). The multiple-slope conversion process, combined with chopper-stabilized amplifiers, results in a significant increase in ADC speed, while maintaining very high resolution and accuracy. 3.1 Dual-Slope Conversion Principles The conventional dual-slope converter measurement cycle (shown in Figure 3-1) has two distinct phases: 1 ...
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... ANALOG SECTION DESCRIPTION The TC850 analog section consists of an input buffer amplifier, integrator amplifier, comparator and analog switches. A simplified block diagram is shown in Figure 4-1. C REF1 REF1- REF1 REF1 DE DE IN+ DE1 DE1 INT (-) (+) DE1 DE1 (+) (-) ANALOG COMMON INT INT IN- *Auto Zeroed Amplifiers FIGURE 4-1: Analog Section Simplified Schematic ...
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... At this point, the analog input voltage has been converted with 15 bits of resolution. If the analog input is greater than full scale, the TC850 performs up to three overrange de-integrate sub- phases. Each subphase occupies a maximum of 64 clock pulses. The overrange feature permits analog inputs up to 192 LSBs greater than full scale to be correctly converted ...
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... The integrator output can swing within 0.4V of either supply without loss of linearity. 5.2 Differential Reference (V The TC850 requires two reference voltage sources in order to generate the “fast-slow” de-integrate phases. The main voltage reference ( applied between REF1 the REF + and REF- pins ...
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... TC850 6.0 DIGITAL SECTION DESCRIPTION The TC850 digital section consists of two sets of con- version counters, control and sequencing logic, clock oscillator and divider, data latches and an 8-bit, 3-state interface bus. A simplified schematic of the bus interface logic is shown in Figure 6-1 6.1 Clock Oscillator The TC850 includes a crystal oscillator on-chip. All that ...
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... X Note 1: Pin numbers refer to 40-pin PDIP. 2: Extended overrange operation: Although rated at 15 bits (±32,767 counts) of resolution, the TC850 provides an addi- tional 191 counts above full scale. For example, with a full-scale input of 3.2768V, the maximum analog input voltage which will be properly converted is 3.2958V. The extended resolution is signified by the overrange bit being high and the low-order byte contents being between 0 and 190 ...
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... RD and WR inputs. 6.3.2 WRITE ENABLE INPUT (WR) The write input is used to initiate a conversion when the TC850 is in Demand mode. CS and CE must be active for the WR input to be recognized. The status of the data bus is meaningless during the WR pulse, because no data is actually written into the TC850. 6.3.3 ...
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... The full scale voltage can range from 3.2V to 3.5V. Full scale voltages of less than 3.2V will result in increased noise in the Least Significant bits, while a full scale above 3.5V will exceed the input common-mode range. 7.1.2 INTEGRATION RESISTOR The TC850 buffer supplies 25 μA of integrator charging current with minimal linearity error. R calculated: EQUATION 7-3: V FULLSCALE ...
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... Data Bus Interfacing The TC850 provides an easy and flexible digital inter- face. A 3-state data bus and six control inputs permit the TC850 to be treated as a memory device, in most applications. The conversion result can be accessed over an 8-bit bus or via a μP I/O port. A typical μP bus interface for the TC850 is shown in Figure 8-2 ...
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... In Demand mode, the three data bytes can be read in μ P I/O any desired order. The TC850 is simply regarded as three bytes of memory and accessed accordingly. The bus output timing is shown in Figure 8-2. 8.4 Continuous Mode Interface Timing When the CONT/DEMAND input is HIGH, the TC850 performs conversions continuously ...
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... TC850 . . . . Internal Clock 319 Clock Cycles BUSY Previous Conversion DB0-DB7 Data Valid FIGURE 8-4: Conversion Timing, Demand Mode HI-Z DB0-DB6 HI-Z DB7 OVR/POL L/H NOTE: CONT/DEMAND = LOW *RD (as well as CS and CE) can go HIGH after each byte is read (i.e bus interface) or remain LOW during the entire DATA-READ sequence (i.e., mP I/O port interface). ...
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... NOTES HIGH LOW FIGURE 8-7: Bus Output Timing, Continuous Mode © 2006 Microchip Technology Inc 1280 Internal Clock Cycles 443-1/2 Clock T WRE T WRD Data Bits 8-14 Data Bits 0-7 Polarity TC850 . . . . . Cycles 1/2 Clock Cycle Data Valid Data Meaningless Data Bits 8-14 High-Impedance Overrange State DS21479C-page 19 ...
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... TC850 9.0 PACKAGING INFORMATION 9.1 Package Marking Information Package marking data not available at this time 9.2 Taping Form Component Taping Orientation for 44-Pin PLCC Devices Pin 1 Carrier Tape, Number of Components Per Reel and Reel Size Package 44-Pin PLCC NOTE: Drawing does not represent total number of pins. ...
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... Microchip Technology Inc. Pin 1 .555 (14.10) .530 (13.46) .610 (15.49) .590 (14.99) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .700 (17.78) .610 (15.50) .022 (0.56) .015 (0.38) Pin 1 .021 (0.53) .050 (1.27) Typ. .013 (0.33) .032 (0.81) .026 (0.66) .020 (0.51) Min. .120 (3.05) .090 (2.29) .180 (4.57) .165 (4.19) Dimensions: inches (mm) TC850 ° 3 Min. Dimensions: inches (mm) .630 (16.00) .591 (15.00) DS21479C-page 21 ...
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... TC850 NOTES: DS21479C-page 22 © 2006 Microchip Technology Inc. ...
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... Customers representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com TC850 should contact their distributor, DS21479C-page 23 ...
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... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: TC850 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this document easy to follow? If not, why? 4 ...
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... Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. © 2006 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K ...
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... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2006 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...