|Category||Data Conversion => ADC (Analog to Digital Converters) => BCD Output A/D|
|Title||BCD Output A/D|
|Description||The TC7135 4-1/2 Digit Analog-to-digital Converter (ADC) Offers 50 PPM (1 Part in 20,000)resolution With a Maximum Nonlinearity Error of 1 Count|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC7135 datasheet
Low Rollover Error: ±1 Count Max Nonlinearity Error: ±1 Count Max Reading for 0V Input True Polarity Indication at Zero for Null Detection Multiplexed BCD Data Output TTL-Compatible Outputs Differential Input Control Signals Permit Interface to UARTs and Microprocessors Blinking Display Visually Indicates Overrange Condition Low Input Current: 1pA Low Zero Reading Drift: 2µV/°C Auto-Ranging Supported with Overrange and Underrange Signals Available in PDIP and Surface-Mount Packages
The TC7135 4-1/2 digit A/D converter (ADC) offers 50ppm (1 part in 20,000) resolution with a maximum nonlinearity error of 1 count. An auto zero cycle reduces zero error to below 10µV and zero drift to 0.5µV/°C. Source impedance errors are minimized a 10pA maximum input current. Rollover error is limited to ±1 count. Microprocessor based measurement systems are supported by BUSY, STROBE and RUN/HOLD control signals. Remote data acquisition systems with data transfer via UARTs are also possible. The additional control pins and multiplexed BCD outputs make the TC7135 the ideal converter for display or microprocessor based measurement systems.Applications
Precision Analog Signal Processor Precision Sensor Interface High Accuracy DC Measurements
Part Number TC7135CPI TC7135CBU Package 28-Pin PLCC 28-Pin PDIP 64-Pin PQFP Temperature Range to +70°C
REF IN OVERRANGE 3 ANALOG STROBE COMMON Analog GND 4 RUN/HOLD INT OUT 0.47µF 5 DIGTAL GND IN 6 BUFF OUT POLARITY 100k 7 CLOCK C 100 Signal 1µF 8 REF k BUSY Input CREF+ 9 -INPUT (LSD) 10 D2 +INPUT 12 D5 (MSD) 13 B1 (LSB) (MSB) B2 B4VREF IN ANALOG COM INT OUT 25 RUN/HOLD 24 DIGTAL GND 23 POLARITY AZ IN BUFF OUT C REFCREF+ INPUT
Positive Supply Voltage..........................................+6V Negative Supply Voltage....................................... - 9V Analog Input Voltage (Pin to V- (Note 2) Reference Input Voltage (Pin V+ to VClock Input Voltage........................................ to V+ Operating Temperature Range............... to +70°C Storage Temperature Range............ to +150°C Package Power Dissipation; (TA 70°C) 28-Pin PDIP..................................... 1.14 28-Pin PLCC.................................... 64-Pin PQFP.....................................1.14
*Stresses above 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 above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Electrical Characteristics: = +25°C, FCLOCK = -5V, unless otherwise specified (see Functional Block Diagram). Symbol Parameter Min Typ Max Unit Test Conditions
Display Reading with Zero Volt Input FS NL DNL ±FSE IIN eN Digital IIL IIH VOL V OH Input Low Current Input High Current Output Low Voltage Output High Voltage; 1 D5 Busy, Polarity, Overrange, Underrange, Strobe Clock Frequency Zero Reading Temperature Coefficient Full Scale Temperature Coefficient Nonlinearity Error Differential Linearity Error Display Reading in Ratiometric Operation ± Full Scale Symmetry Error (Rollover Error) Input Leakage Current Noise Display Reading Note 2 and Note 3 VIN = 0V, (Note 4) VIN = 2V, (Note 4 and Note 5) Note 6 Note 6 VIN = VREF, (Note 2) -VIN = +VIN, (Note 7) Note 3 Peak-to-Peak Value not Exceeded 95% of Time VIN = 0V VIN = +5V IOL = 1.6mA IOH = 1mA IOH = 10µA
Limit input current to under 100µA if input voltages exceed supply voltage. Full scale voltage = 2V. VIN TA +70°C.External reference temperature coefficient less than 0.01ppm/°C. -2V VIN +2V. Error of reading from best fit straight line. IVIN| = 1.9959. Specification related to clock frequency range over which the TC7135 correctly performs its various functions. Increased errors result at higher operating frequencies.
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