參數(shù)資料
型號： ADS1217
英文描述： 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER
中文描述： 8通道，24位模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 14/28頁
文件大?。?/td> 458K
代理商： ADS1217
ADS1217
SBAS260B
14
www.ti.com
DIGITAL I/O INTERFACE
The ADS1217 has eight pins dedicated for digital I/O. The
default power-up condition for the digital I/O pins are as inputs.
All of the digital I/O pins are individually configurable as inputs
or outputs. They are configured through the DIR control regis-
ter. The DIR register defines whether the pin is an input or
output, and the DIO register defines the state of the digital
output. When the digital I/O are configured as inputs, DIO is
used to read the state of the pin. If the digital I/O are not used,
either 1) configure as outputs; or, 2) leave as inputs and tie to
ground, this prevents excess power dissipation.
SERIAL PERIPHERAL INTERFACE
The Serial Peripheral Interface (SPI) allows a controller to
communicate synchronously with the ADS1217. The ADS1217
operates in slave only mode.
Chip Select (
CS
)
The chip select (
CS
) input of the ADS1217 must be exter-
nally asserted before a master device can exchange data
with the ADS1217.
CS
must be LOW for the duration of the
transaction.
CS
can be tied low.
Serial Clock (SCLK)
SCLK, a Schmitt Trigger input, clocks data transfer on the D
IN
input and D
OUT
output. When transferring data to or from the
ADS1217, multiple bits of data may be transferred back-to-
back with no delay in SCLKs or toggling of
CS
. Make sure
to avoid glitches on SCLK as they can cause extra shifting of
the data.
Polarity (POL)
The serial clock polarity is specified by the POL input. When
SCLK is active HIGH, set POL HIGH. When SCLK is active
LOW, set POL LOW.
DATA READY
The
DRDY
output is used as a status signal to indicate when
data is ready to be read from the ADS1217.
DRDY
goes LOW
when new data is available. It is reset HIGH when a read
operation from the data register is complete. It also goes HIGH
prior to the updating of the output register to indicate when not
to read from the device to ensure that a data read is not
attempted while the register is being updated.
DSYNC OPERATION
DSYNC is used to provide for synchronization of the A/D
conversion with an external event. Synchronization can be
achieved either through the
DSYNC
pin or the DSYNC
command. When the
DSYNC
pin is used, the filter counter is
reset on the falling edge of
DSYNC
. The modulator is held in
reset until
DSYNC
is taken HIGH. Synchronization occurs on
the next rising edge of the system clock after
DSYNC
is
taken HIGH.
FIGURE 4. Filter Frequency Responses.
SINC
3
FILTER RESPONSE
(1)
(
–
3dB = 0.262
f
DATA
= 15.76Hz)
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
0
30
120
60
90
150
180
210
240
270
300
G
SINC
2
FILTER RESPONSE
(1)
(
–
3dB = 0.318
f
DATA
= 19.11Hz)
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
0
30
120
60
90
150
180
210
240
270
300
G
FAST SETTLING FILTER RESPONSE
(1)
(
–
3dB = 0.469
f
DATA
= 28.125Hz)
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
0
NOTE: (1) f
DATA
= 60Hz.
30
120
60
90
150
180
210
240
270
300
G
相關(guān)PDF資料
PDF描述
ADS1217IPFBR 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER
ADS1217IPFBT 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER
ADS1225 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator
ADS1225IRGVR 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator
ADS1225IRGVRG4 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1217EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1217 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
ADS1217IPFB 制造商:Texas Instruments 功能描述:IC 24BIT ADC SMD 1217 TQFP48 制造商:Texas Instruments 功能描述:IC, 24BIT ADC, SMD, 1217, TQFP48
ADS1217IPFB 制造商:Texas Instruments 功能描述:IC 24BIT ADC SMD 1217 TQFP48
ADS1217IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Ch 24-Bit ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1217IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Ch 24B ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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