Details, datasheet, quote on part number: TC7109IJL
PartTC7109IJL
Category
Description12-bit Up-compatible Analog-to-digital Converters
CompanyTelCom Semiconductor
DatasheetDownload TC7109IJL datasheet
Quote
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Features, Applications

FEATURES

Zero-Integrator Cycle for Fast Recovery From Input Overloads Eliminates Cross -Talk in Multiplexed Systems 12-Bit Plus Sign Integrating A/D Converter With Overrange Indication Sign Magnitude Coding Format True Differential Signal Input and Differential Reference Input Low Noise.............................................15VP-P Typ. Input Current.............................................. 1pA Typ. No Zero Adjustment Needed TTL-Compatible, Byte-Organized Tri-State Outputs UART Handshake Mode for Simple Serial Data Transmission

The a 12-bit plus sign, CMOS low-power analog-to-digital converter (ADC). Only eight passive components and a crystal are required to form a complete dual-slope integrating ADC. The improved VOH source current TC7109A has features that make it an attractive per-channel alternative to analog multiplexing for many data acquisition applications. These features include typical input bias current of 1pA, drift of less than 1V/C, input noise typically 15VPP, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers. The TC7109A provides a versatile digital interface. In the direct mode, chip select and HIGH/LOW byte enables control parallel bus interface. In the handshake mode, the TC7109A will operate with industry-standard UARTs in controlling serial data transmission ideal for remote data logging. Control and monitoring of conversion timing is provided by the RUN/HOLD input and STATUS output. For applications requiring more resolution, see the TC500, 15-bit plus sign ADC data sheet. The TC7109A has improved overrange recovery performance and higher output drive capability than the original TC7109. All new (or existing) designs should specify the TC7109A wherever possible.

* The "A" version has a higher IOUT on the digital lines. FUNCTIONAL BLOCK DIAGRAM

REF AZ ZI INPUT 35 HI INT ZI AZ REF ZI R CAZ C INT REF INT CAP INT BUFF AZ BUFFER + INTEGRATOR + 16 THREE-STATE OUTPUTS COMPARATOR COMP OUT 14 LATCHES 12-BIT COUNTER LATCH CLOCK


TC7109/A-7 11/6/96 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

Positive Supply Voltage (GND to V+)..................... +6.2V Negative Supply voltage (GND to V)...................... 9V Analog Input Voltage (Low to High) (Note to V Reference Input Voltage (Low to High (Note to V Digital Input Voltage (Pins 227) (Note 2).... GND 0.3V Power Dissipation, < 70C, (Note 3) CerDIP............................................................. 2.29W Plastic DIP....................................................... 1.23W PLCC............................................................... 1.23W PQFP............................................................... 1.00W Operating Temperature Range Plastic Package +70 C Ceramic Package (I)....................... +85 C (M)................... +125 C Storage Temperature Range............... +150 C Lead Temperature (Soldering, 10 sec)................. +300 C

*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. 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 operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. NOTES: 1. Input voltages may exceed supply voltages if input current is limited 100A. 2. Connecting any digital inputs or outputs to voltages greater than V+ or less than GND may cause destructive device latchup. Therefore, it is recommended that inputs from sources other than the same power supply should not be applied to the TC7109A before its power supply is established. In multiple supply systems, the supply to the device should be activated first. 3. This limit refers to that of the package and will not occur during normal operation.

Overload Recovery Time (TC7109A) Zero Input Reading Ratio Metric Reading NL Nonlinearity (Max Deviation From Best Straight Line Fit) Roll-Over Error (Difference in Reading for Equal Positive and Negative Inputs Near (Full Scale) Input Common-Mode Rejection Ratio Common-Mode Voltage Range Noise (P-P Value Not Exceeded 95% of Time) Leakage Current at Input VIN = 0V Full Scale = 409.6mV VIN = VREF = 204.8mV Full Scale to 2.048V Over Full Operating Temperature Range Full Scale to 2.048V Over Full Operating Temperature Range VCM 1V, VIN = 0V Full Scale = 409.6mV Input High, Input Low, and Common Pins VIN = 0V Full Scale = 409.6mV VIN, All Packages: +25C C Device: +70C I Device: +85C M Device: TA +125C VIN = 0V VIN = >77708 Reading, Ext Ref = 0ppm/C VIN = 0V, Crystal Oscillator 3.58MHz Test Circuit Pins Open

Measurement Cycle +00008 Octal Reading 40008 Octal Reading +1 Count

Zero Reading Drift Scale-Factor Temperature Coefficient Supply Current (V+ to GND) Supply Current (V+ to V)

Ref Out Voltage Ref Out Temperature Coefficient Output High Voltage TC7109A: IOUT 700 A Output Low Voltage Output Leakage Current Control I/O Pull-Up Current Control I/O Loading Input High Voltage Input Low Voltage Input Pull-Up Current Input Pull-Down Current Oscillator Output Current, High Oscillator Output Current, Low Buffered Oscillator Output Current, High Buffered Oscillator Output Current, Low Mode Input Pulse Width

Referenced to 25k Between V+ and Ref Out 25k Between V+ and Ref Out TA +70C V+, TC7109: IOUT 100 A Pins IOUT = 1.6mA Pins 16 High Impedance Pins 19, 20 VOUT = V+ 3V Mode Input at GND HBEN, Pin 19; LBEN, Pin 18 Pins Referenced to GND Pins Referenced to GND Pins 26, 27; VOUT = V+ 3V Pins 17, 24; VOUT = V+ 3V Pin 21; VOUT = GND = +3V VOUT = 2.5V VOUT = 2.5V VOUT = 2.5V VOUT = 2.5V

HANDLING PRECAUTIONS: These devices are CMOS and must be handled correctly to prevent damage. Package and store only in conductive foam, antistatic tubes, or other conducting material. Use proper antistatic handling procedures. Do not connect in circuits under "power-on" conditions, as high transients may cause permanent damage.


 

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