參數(shù)資料
型號: TC7109CKW
廠商: Microchip Technology
文件頁數(shù): 8/30頁
文件大小: 0K
描述: IC ADC 12BIT HANDSHAKE 44-MQFP
標準包裝: 96
位數(shù): 12
數(shù)據(jù)接口: 串行,并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 雙 ±
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 44-QFP
供應商設備封裝: 44-MQFP(10x10)
包裝: 托盤
輸入數(shù)目和類型: 1 個差分,單極
產(chǎn)品目錄頁面: 673 (CN2011-ZH PDF)
TC7109/A
DS21456C-page 16
2006 Microchip Technology Inc.
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 10
μA. 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 2k
Ω precision
potentiometer in series with a 24k
Ω fixed resistor.
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