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ADS9217 датащи(PDF) 21 Page - Texas Instruments

номер детали ADS9217
подробное описание детали  ADS911x 18-Bit, 20MSPS SAR ADC With Fully Differential ADC Input Driver
PDF  68 Pages
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производитель  TI2 [Texas Instruments]
домашняя страница  https://www.ti.com
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ADS9217 датащи(HTML) 21 Page - Texas Instruments

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7.3.4 Reference Voltage
The ADS911x has a precision, low-drift voltage reference internal to the device. For best performance, filter the
internal reference noise (as shown in Figure 7-2) by connecting a 10µF ceramic bypass capacitor to the REFIO
pin. As shown in Figure 7-3, connect an external reference at the REFIO pin. When using an external reference,
disable the internal reference voltage by writing PD_REF = 1b in address 0xC1 of register bank 1.
REFIO
4.096 V
10 μF
GND
PD_REF = 0
1 k
User register bit
External capacitor
for reference
noise reduction
AVDD_5V
REFM
GND
ADC REF
Figure 7-2. Internal Reference Voltage
REFIO
4.096 V
10 μF
GND
PD_REF = 1
1 k
User register bit
REF7040
5V
AVDD_5V
OUTF
OUTS
VIN
EN
GND
REFM
GND
ADC REF
Figure 7-3. External Reference Voltage
7.3.5 Temperature Sensor
The ADS911x features a 10-bit temperature sensor for measuring temperature inside the device. Follow the
sequence listed in Table 7-2 to read the temperature sensor output with the SPI. Read the temperature sensor
data at anytime independent of the ADC data interface.
Equation 1 calculates the transfer function for the temperature sensor.
Temperature=−85.0172+(10bitoutput×0.24918)°C
(1)
www.ti.com
ADS9117, ADS9118, ADS9119
SLVSIN3 – MAY 2025
Copyright © 2025 Texas Instruments Incorporated
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Product Folder Links: ADS9117 ADS9118 ADS9119



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