High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
12 ADC Converter Function Pack Design Guide
ADC Converter Function Pack Design Guide 13
High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
The TC7109A is a 12-bit plus sign, CMOS low-power Analog-to-
Digital converter. Only eight passive components and a crystal
are required to form a complete dual-slope integrating ADC.
The improved V
OH
source current and other TC7109A features
make it an attractive per-channel alternative to analog
multiplexing for many data acquisition applications. These
features include typical input bias current of 1 pA, drift of less
than 1 µV/°C, input noise typically 15 µVP-P and auto-zero.
True differential input and reference allow measurement of
bridge-type transducers, such as load cells, strain gauges, and
temperature transducers.
ADC BY ARCHITECTURE – 12-BIT DUAL-SLOPE WITH SERIAL AND PARALLEL BINARY OUTPUT
ADC Product Specifications
Part
Supply
Voltage
(V)
Input Voltage Range
(V)
Resolution
(Digits)
Sampling
Rate
(Conv/s)
Input
Channels
Data
Interface
Temp.
Range
(°C) Features Packages
TC7109A ±5 V
SS
+ 1.5V to V
DD
– 1.0V 12 bits plus
sign bit
±32,768 1 Parallel
or Serial
-25 to +85 Differential Input
Range
44 PDIP, 40 CerDIP,
44 PLCC, 44 PQFP
The TC7109A provides a versatile digital interface. In the
Direct mode, chip select and HIGH/LOW byte enable control
parallel bus interface. In the Handshake mode, the TC7109/A
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.
Key Features:
n
Zero Integrator Cycle for Fast Recovery from Input Overloads
n Eliminates Cross-Talk in Multiplexed Systems
n 12-Bit Plus Sign Integrating A/D Converter with Overrange
Indication
n Sign Magnitude Coding Format
n
True Differential Signal Input and Differential Reference Input
n Low Noise: 15 µV
P-P
Typ.
n Input Current: 1 pA Typ.
n No Zero Adjustment Needed
n TTL Compatible, Byte Organized Tri-state Outputs
n
UART Handshake Mode for Simple Serial Data Transmissions
Applications:
n Ideal for remote data logging
n Bridge-type Transducer Measurements
– Load Cells
– Strain Gauges
– Temperature Transducers
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