ADS1217 - 8-Channel 24-Bit Delta-Sigma ADC | Texas Instruments
MPN: ADS1217 ✓ פעילADS1217 סקירה
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution. It is part of the ADC family, which converts analog signals into digital data for processing by microcontrollers or DSPs. Delta-sigma ADCs are known for their excellent linearity and low noise, making them ideal for precision measurement applications where accuracy is critical.
Key features of the ADS1217 include 24-bit no missing codes, INL of 0.0012% of FSR (max), full-scale input of ±2VREF, and a PGA with gains from 1 to 128. It offers 22 bits of effective resolution at PGA=1 and 19 bits at PGA=128. The device supports single-cycle settling mode and programmable data output rates up to 1kHz. It also includes an on-chip 1.25V/2.5V reference, reducing external component count.
Technically, the ADS1217 uses a delta-sigma modulator followed by a digital filter, achieving high resolution through oversampling. The multiplexed inputs allow multiple sensors to be connected, and the PGA amplifies small signals before conversion, improving dynamic range. The device includes an internal buffer that can be selected to provide high input impedance, simplifying sensor interfacing.
Typical applications include smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation. Its high resolution and low noise make it suitable for precision measurement systems where accuracy is paramount. The wide input range and programmable gain allow it to handle a variety of sensor outputs.
When designing with the ADS1217, ensure proper decoupling of the analog and digital supplies and use a clean reference voltage. The PGA gain setting should be chosen to maximize dynamic range while avoiding saturation. The serial interface allows easy connection to microcontrollers, and the single-cycle settling mode is useful for multiplexed applications.
חלופות תחליף ישיר עבור ADS1217 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS1217 (אותו גורם צורה וטביעת רגל) — שונים ב Number of Input Channels, Package, Resolution.
ADS1217IPFBR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS1217IPFBT
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS1211
⚡ אותה מארזה ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS127L11
⚡ אותה מארזה ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS1263
⚡ אותה מארזה ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS1217 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 24 bits |
| Number of Input Channels | 8 |
| Supply Voltage Range | 2.7 V to 5.25 V |
| No Missing Code Performance | 24 bits |
| Effective Resolution (PGA=1) | 22 bits |
| Effective Resolution (PGA=128) | 19 bits |
| INL (max) | 0.0012% of FSR |
| Full-Scale Input | ±2VREF |
| Programmable Gain Amplifier (PGA) Gains | 1 to 128 |
| Data Output Rate (max) | 1 kHz |
| On-Chip Reference | 1.25 V / 2.5 V |
| Single-Cycle Settling Mode | Yes |
| מארז | 48-TQFP (7x7 mm) |
| סוג הרכבה | Surface Mount |
תצורת פינים של ADS1217
| פין 1 | AVDD — Analog power supply |
| פין 2 | AVSS — Analog ground |
| פין 3 | AIN0 — Analog input channel 0 |
| פין 4 | AIN1 — Analog input channel 1 |
| פין 5 | AIN2 — Analog input channel 2 |
| פין 6 | AIN3 — Analog input channel 3 |
| פין 7 | AIN4 — Analog input channel 4 |
| פין 8 | AIN5 — Analog input channel 5 |
| פין 9 | AIN6 — Analog input channel 6 |
| פין 10 | AIN7 — Analog input channel 7 |
| פין 11 | VREF — Reference voltage input |
| פין 12 | DVDD — Digital power supply |
| פין 13 | DGND — Digital ground |
| פין 14 | SCLK — Serial clock input |
| פין 15 | DOUT — Serial data output |
| פין 16 | DIN — Serial data input |
| פין 17 | CS — Chip select (active low) |
| פין 18 | DRDY — Data ready output |
יישומים טיפוסיים
ADS1217 מתאים עבור 6 יישוםs: Smart Transmitters, Industrial Process Control, Weigh Scales, Chromatography, Portable Instrumentation, Data Acquisition Systems.
Smart Transmitters
The ADS1217 is ideal for smart transmitters in industrial process control. Its 24-bit resolution and 8-channel multiplexing allow precise measurement of multiple sensor signals, such as pressure and temperature. The internal PGA amplifies low-level sensor outputs, and the high INL ensures accuracy. The device operates from 2.7V to 5.25V, compatible with fieldbus power supplies. Its serial interface simplifies connection to microcontrollers, enabling digital calibration and communication. The single-cycle settling mode is beneficial for fast update rates in control loops.
מומלץ
Industrial Process Control
In industrial process control, the ADS1217 provides high-resolution conversion for monitoring and control loops. Its 24-bit no missing code performance ensures accurate representation of analog signals, while the 8 input channels allow multiple process variables to be digitized. The programmable data rate up to 1kHz supports real-time control. The device's wide supply range and internal reference reduce external components, simplifying design. The PGA enables direct connection to sensors with varying output levels, and the serial interface allows easy integration with PLCs or microcontrollers.
מומלץ
Weigh Scales
The ADS1217 is well-suited for weigh scales due to its high resolution and low noise. The 24-bit resolution and effective 22-bit performance allow precise measurement of load cell outputs. The internal PGA with gains up to 128 amplifies the small differential signals from load cells, improving sensitivity. The device's INL of 0.0012% ensures linearity across the measurement range. The 8-channel multiplexing can support multiple load cells in a single system. The serial interface enables easy connection to a microcontroller for display and calibration.
מומלץ
Chromatography
In chromatography systems, the ADS1217 provides high-resolution data acquisition for detector signals. Its 24-bit resolution and low noise are essential for detecting small analyte peaks. The 8 input channels can monitor multiple detectors or columns. The programmable gain allows optimization for different signal levels, and the single-cycle settling mode enables fast sampling for high-throughput analysis. The device's wide supply range and internal reference simplify power design. The serial interface allows integration with data acquisition systems.
מומלץ
Portable Instrumentation
The ADS1217 is suitable for portable instrumentation due to its low power operation from 2.7V to 5.25V. Its high resolution and 8-channel multiplexing allow multiple sensors to be monitored in a compact design. The internal PGA and reference reduce external components, saving board space and power. The serial interface is compatible with low-power microcontrollers, enabling battery-powered operation. The device's accuracy ensures reliable measurements in field applications.
מומלץ
Data Acquisition Systems
The ADS1217 is a key component in data acquisition systems, providing high-resolution conversion of multiple analog signals. Its 24-bit resolution and 8 input channels enable precise digitization of sensor outputs. The programmable gain and data rate allow flexibility in system design. The device's serial interface simplifies connection to microcontrollers or DSPs. The internal reference and buffer reduce external components, making it ideal for compact DAQ modules. The high INL ensures accurate data for analysis.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS1217 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADS1217IPFBR | ADS1217IPFBT | ADS1211 | ADS127L11 | ADS1263 |
|---|---|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Number of Channels | 8 | 8 | 8 | 4 | 1 | 10 |
| Supply Voltage Range | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 1.8V to 3.3V | 2.7V to 5.25V |
| Max Data Rate | 1 kHz | 1 kHz | 1 kHz | 1 kHz | 512 kSPS | 38.4 kSPS |
| INL (max) | 0.0012% of FSR | 0.0012% of FSR | 0.0012% of FSR | 0.0012% of FSR | 0.0008% of FSR | 0.0004% of FSR |
| PGA Gains | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 64 | 1 to 32 |
מבדילים עיקריים
- 8 input channels (לעומתADS1211)
- Wide supply voltage range (לעומתADS127L11)
- Internal PGA with gains up to 128 (לעומתADS1263)
הערות תכנון
Use separate analog and digital power supplies to minimize noise coupling. Place 0.1uF and 10uF decoupling capacitors close to the AVDD and DVDD pins. A clean reference voltage is critical for accuracy; use a low-noise reference such as the REF1930.
Keep analog input traces short and shielded from digital signals. Use a ground plane to provide a low-impedance return path. Place the ADC close to the sensors to reduce noise pickup. Ensure the analog and digital grounds are connected at a single point.
Avoid exceeding the absolute maximum ratings on any pin. Ensure the input voltage does not exceed the supply rails. The PGA gain should be set appropriately to avoid saturation. Use the single-cycle settling mode when switching channels to avoid erroneous readings.
מידע על תאימות
RoHS compliant per TI product page. Not AEC-Q100 qualified.
