EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet - Page 25

• Manufacturer Part Number: EVAL-AD7747EBZ
• Description: 24-Bit Capacitance-to-Digital Converter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7747EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Capacitance-to-Digital Converter
• Kit Application Type: Data Converter
• Silicon Core Number: AD7747
• Sensor Type: Touch, Capacitive
• Interface: I²C
• Voltage - Supply: 2.7 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: AD7747
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

VOLTAGE INPUT
Figure 38. Resistive Temperature Sensor Connected to the Voltage Input
R
REF
R
T
RTD
REFIN(+)
REFIN(–)
VIN(+)
VIN(–)
ANALOG TO DIGITAL CONVERTER
MODULATOR
GENERATOR
24-BIT Σ-Δ
CLOCK
VDD
(ADC)
GND
REFERENCE
DIGITAL
FILTER
VOLTAGE
DATA
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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.
V
Along with converting external voltages, the AD7747 Σ-Δ ADC
can be used for monitoring the V
the VDD pin is internally attenuated by 6.
DD
MONITOR
DD
voltage. The voltage from
AD7747