參數(shù)資料
型號(hào): EVAL-AD7747EBZ
廠商: Analog Devices Inc
文件頁數(shù): 18/28頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD7747
標(biāo)準(zhǔn)包裝: 1
傳感器類型: 觸摸,電容式
接口: I²C
電源電壓: 2.7 V ~ 5.25 V
嵌入式:
已供物品: 板,纜線,CD
已用 IC / 零件: AD7747
產(chǎn)品目錄頁面: 781 (CN2011-ZH PDF)
相關(guān)產(chǎn)品: AD7747ARUZ-REEL7-ND - IC CONV CAP TO DIG 24BIT 16TSSOP
AD7747ARUZ-REEL-ND - IC CONV CAP TO DIG 24BIT 16TSSOP
AD7747ARUZ-ND - IC CONV 24BIT CAP-DGTL 16-TSSOP
AD7747
Rev. 0 | Page 25 of 28
VOLTAGE INPUT
DIGITAL
FILTER
24-BIT Σ-Δ
MODULATOR
CLOCK
GENERATOR
ANALOG TO DIGITAL CONVERTER
(ADC)
05
46
9-
0
28
VOLTAGE
REFERENCE
DATA
VIN(–)
VIN(+)
REFIN(–)
REFIN(+)
RREF
RTD
RT
VDD
GND
Figure 38. Resistive Temperature Sensor Connected to the Voltage Input
The AD7747 Σ-Δ core can work as a high resolution (up to
21 ENOB) classic ADC with a fully differential voltage input.
The ADC can be used either with the on-chip high precision,
low drift, 1.17 V voltage reference, or with an external reference
connected to the fully differential reference input pins.
The voltage and reference inputs are continuously sampled by
a Σ-Δ modulator during the conversion. Therefore, the input
source impedance should be kept low. See the application
example in Figure 38.
VDD MONITOR
Along with converting external voltages, the AD7747 Σ-Δ ADC
can be used for monitoring the VDD voltage. The voltage from
the VDD pin is internally attenuated by 6.
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