TC7109ACPL Microchip Technology, TC7109ACPL Datasheet - Page 16
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TC7109ACPL
Manufacturer Part Number
TC7109ACPL
Description
IC ADC 12BIT HANDSHAKE 40DIP
Manufacturer
Microchip Technology
Datasheet
1.TC7109CKW.pdf
(30 pages)
Specifications of TC7109ACPL
Number Of Bits
12
Data Interface
Serial, Parallel
Number Of Converters
1
Voltage Supply Source
Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
158-1130
158-1130
158-1130
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Manufacturer
Quantity
Price
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TC7109/A
3.5.6
REFERENCE SOURCES
A major factor in the absolute accuracy of the ADC is
the stability of the reference voltage. The 12-bit resolu-
tion of the TC7109A is one part in 4096, or 244 ppm.
Thus, for the on-board reference temperature coeffi-
cient of 70ppm/°C, a temperature difference of 3°C will
introduce a one-bit absolute error. Where the ambient
temperature is not controlled, or where high accuracy
absolute measurements are being made, it is
recommended that an external high quality reference
be used.
A reference output (Pin 29) is provided, which may be
used with a resistive divider to generate a suitable ref-
erence voltage (20mA may be sunk without significant
variation in output voltage). A pull-up bias device is pro-
vided, which sources about 10μA. The output voltage is
nominally 2.8V below V+. When using the on-board
reference, REF OUT (Pin 29) should be connected to
REF IN- (pin 39), and REF IN+ should be connected to
the wiper of a precision potentiometer between REF
OUT and V+. The test circuit shows the circuit for a
204.8mV reference, generated by a 2kΩ precision
potentiometer in series with a 24kΩ fixed resistor.
© 2006 Microchip Technology Inc.
DS21456C-page 16