12-BIT UP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS
Description
1
TC7109 TC7109A
12-BIT µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS
FEATURES
s Zero-Integrator Cycle for Fast Recovery From
Input Overloads s Eliminates Cross -Talk in Multiplexed Systems s 12-Bit Plus Sign Integrating A/D Converter With
Overrange Indication s Sign Magnitude Coding Format s True Differential Signal Input and Differential
Reference Input s Low Noise .
.
.
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15 µVP-P Typ s Input Current .
1 pA Typ s No Zero Adjustment Needed s TTL-Compatible, Byte-Organized Tri-State
Outputs s UART Handshake Mode for Simple Serial Data
Transmission
ORDERING INFORMATION PART CODE
A or blank*
TC7109X
Package Code
Package
Temperature Range
CKW
44-Pin PQFP
0°C to +70°C
CLW
44-Pin PLCC
0°C to +70°C
CPL
40-Pin Plastic DIP
0°C to +70°C
IJL
40-Pin CerDIP
–25°C to +85°C
* The "A" version has a higher IOUT on the digital lines.
GENERAL DESCRIPTION
The TC7109A is 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 1µV/°C, input noise typically 15µVP-P, 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 m...
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