ADS1263 - 32-Bit 38-kSPS Delta-Sigma ADC | Texas Instruments
MPN: ADS1263 ✓ Hoạt độngADS1263 Tóm tắt
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve very high resolution and excellent noise performance. Within the data converter hierarchy (ADC -> precision ADC -> delta-sigma ADC), the ADS1263 sits at the top precision tier, essential in data acquisition systems, sensor interfaces, and instrumentation. The integrated PGA and reference reduce external component count and simplify system design.
Key features include 32-bit resolution, a maximum data rate of 38.4 kSPS, 5 differential or 10 single-ended input channels, PGA gains up to 32, and a 2.5V internal reference. The single-cycle settling digital filter provides 130-dB rejection of 50-Hz and 60-Hz line interference, ideal for weigh scales and load cells. The device also integrates IDAC excitation currents, an internal ADC test signal, and 8x multiplexed GPIO.
Architecturally, the ADS1263 combines a delta-sigma modulator with a digital filter, delivering high resolution at low noise. The PGA connects directly to low-level sensor signals, while fault monitors (sensor burnout, supply, and reference monitoring) enhance system reliability. The auxiliary 24-bit ADC runs background measurements such as cold-junction temperature sensing without interrupting main conversions. Communication is via SPI in 4-wire or 3-wire modes.
Typical applications include weigh scales, load cells, strain gauges, temperature sensing (RTD/thermocouple with IDACs), and precision industrial process control, where the low noise and integrated features reduce board space and design complexity.
Design tip: decouple analog and digital supplies carefully, select PGA gain to match the sensor full-scale range to maximize dynamic range, and use the single-cycle settling filter for multiplexed channel scanning to eliminate filter settling wait states.
Bộ thay thế dễ dàng lắp đặt cho ADS1263 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADS1263 (cùng hình factor và footprint) — khác nhau ở Interface, Internal Reference.
ADS1262
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS1220
⚡ Đồng gói ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS124S08
⚡ Đồng gói ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD7175-2BRUZ-RL7
⚡ Đồng gói ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS1263 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 32 bit |
| Auxiliary ADC Resolution | 24 bit |
| Tỷ lệ lấy mẫu | 38.4 kSPS |
| Number of Input Channels | 5 differential / 10 single-ended |
| Converter Type | Sigma-Delta (ΔΣ) |
| PGA Gain | Up to 32x |
| Internal Reference | 2.5 V |
| Giao diện | SPI (3-wire or 4-wire) |
| Line Frequency Rejection | 130 dB at 50 Hz / 60 Hz |
| Integrated Features | PGA, VREF, IDACs, fault monitors, GPIO |
| Hộp | 28-TSSOP |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +125C |
| Noise Performance | Low-noise, low-drift |
Cấu hình chân ADS1263
| Chân 1 | AVDD — Analog power supply |
| Chân 2 | AVSS — Analog ground / negative supply |
| Chân 3 | REFP0 — Positive reference input 0 |
| Chân 4 | REFN0 — Negative reference input 0 |
| Chân 5 | AIN0 — Analog input 0 |
| Chân 6 | AIN1 — Analog input 1 |
| Chân 7 | AIN2 — Analog input 2 |
| Chân 8 | AIN3 — Analog input 3 |
| Chân 9 | AIN4 — Analog input 4 |
| Chân 10 | AIN5 — Analog input 5 / IDAC routing |
| Chân 11 | AIN6 — Analog input 6 / IDAC routing |
| Chân 12 | AIN7 — Analog input 7 / IDAC routing |
| Chân 13 | AIN8 — Analog input 8 / GPIO |
| Chân 14 | AIN9 — Analog input 9 / GPIO |
| Chân 24 | SCLK — SPI serial clock |
| Chân 25 | DIN — SPI data in |
| Chân 26 | DOUT/DRDY — SPI data out / data ready |
| Chân 27 | CS — SPI chip select |
| Chân 28 | IOVDD — Digital I/O power supply |
Ứng dụng tiêu biểu
ADS1263 phù hợp cho 6 Áp dụngs: Weigh Scales and Load Cells, RTD Temperature Sensing, Industrial Process Control, Thermocouple Measurement, Laboratory and Test Instrumentation, Battery-Powered Data Loggers.
Weigh Scales and Load Cells
The ADS1263 fits weigh-scale front ends because its PGA with up to 32x gain directly amplifies millivolt-level bridge outputs, and its 2.5V internal reference powers the bridge without external components. The single-cycle settling digital filter gives 130-dB rejection of 50-Hz and 60-Hz line noise at low data rates, so each channel reading is settled immediately after mux switching. Placed between the load cell and an MCU via SPI, it removes the need for a separate instrumentation amplifier and precision reference, cutting BOM cost and board area while delivering 32-bit resolution for fine weight discrimination.
Được đề xuất
RTD Temperature Sensing
For RTD measurements, the ADS1263 integrates two matched IDAC excitation currents that drive the sensor directly, with fault monitors detecting sensor burnout automatically. The 32-bit main ADC resolves microvolt-level RTD voltage changes, while the integrated 2.5V reference ensures ratio-metric accuracy. The auxiliary 24-bit ADC can simultaneously measure cold-junction compensation in the background without interrupting the main RTD conversion. This one-chip approach replaces discrete excitation, reference, and compensation circuitry, achieving high-accuracy temperature readings across the industrial -40C to +125C ambient range.
Được đề xuất
Industrial Process Control
In process-control data acquisition, the ADS1263 digitizes 4-20 mA loops, pressure transmitters, and strain-gauge inputs with 32-bit resolution across 10 single-ended or 5 differential channels. The multiplexed input with single-cycle settling lets one ADC scan many sensor points without filter wait states, while integrated supply and reference monitors flag out-of-range conditions for predictive maintenance. Its SPI interface connects cleanly to isolated digital isolators, and the TSSOP-28 package with -40C to +125C rating withstands control-cabinet environments, consolidating multi-channel acquisition into a single low-noise IC.
Được đề xuất
Thermocouple Measurement
Thermocouple front ends benefit from the ADS1263 PGA amplifying microvolt-level Seebeck signals with low input noise, while the auxiliary 24-bit ADC performs background cold-junction temperature measurement so the main converter never pauses. Internal sensor-burnout detection immediately flags open thermocouple faults, a mandatory safety feature in furnace and boiler monitoring. With the 2.5V reference and IDACs on-chip, the complete channel requires only the thermocouple connector and minimal filtering. The result is a compact, high-accuracy thermocouple input card supporting the industrial -40C to +125C operating envelope.
Được đề xuất
Laboratory and Test Instrumentation
Bench instruments, data loggers, and sensor test fixtures use the ADS1263 where 32-bit dynamic range resolves small signals near large DC offsets. The low-drift 2.5V reference maintains accuracy over temperature and time, and the internal ADC self-test signal supports built-in verification routines. GPIO pins multiplexed on the device control relays or range switches directly. An auxiliary 24-bit ADC enables simultaneous monitoring of instrument temperature or supply rails during measurements, and SPI communication at up to 38.4 kSPS output supports fast scanning without sacrificing the low-noise floor demanded by precision metrology.
Được đề xuất
Battery-Powered Data Loggers
The ADS1263 suits portable loggers because its power-down and standby modes cut supply current between conversions, and the highly integrated analog path (PGA, reference, IDACs) replaces several always-on discrete components. A single 32-bit converter scanning multiple environmental sensors reduces component count, lowering overall energy per reading. The auxiliary 24-bit ADC can track battery voltage in the background. Designers should duty-cycle conversions and use the MCU to gate the SPI bus, since at full 38.4-kSPS operation the delta-sigma modulator and digital filter dominate system power consumption.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS1263 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ADS1262 | ADS1220 | AD7175-2 |
|---|---|---|---|---|
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same footprint | 28-TSSOP - footprint differs |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Resolution | 32 bit | 32 bit | 24 bit | 24 bit |
| Max Data Rate | 38.4 kSPS | 38.4 kSPS | 2 kSPS | 250 kSPS |
| Auxiliary ADC | Yes (24-bit) | No | No | No |
| PGA Gain | Up to 32x | Up to 32x | Up to 128x | 1x-16x |
| Drop-in Compatible | - | Yes - pin and functional compatible | No - register/pinout differences | No - PCB redesign required |
Bảo phân biệt quan trọng
- Auxiliary 24-bit ADC for background measurements (vsADS1262)
- Highest resolution in TI 28-TSSOP sensor ADC family (vsADS1220)
- Complete one-chip analog front end (vsAD7175-2)
Ghi chú thiết kế
Separate the analog (AVDD/AVSS) and digital (IOVDD) supply domains and decouple each pin with 0.1-uF ceramics placed within 2 mm of the pin, plus bulk 1-uF to 10-uF capacitors per rail. Route the SPI traces away from analog inputs to prevent digital coupling into the PGA front end. A solid ground plane under the ADS1263 preserves the low-noise floor; never split ground beneath the package.
Use the single-cycle settling filter when scanning multiple input channels - other filter modes require waiting for filter settling after each mux switch, which silently reduces effective throughput. Match PGA gain to the sensor full-scale range: excessive gain saturates the modulator while insufficient gain wastes dynamic range. Enable the sensor burnout detect monitors during RTD/thermocouple commissioning to catch open-wire faults early.
Add RC anti-alias filters (e.g., 1 k-ohm and 10 nF differential) on AINx pins to attenuate out-of-band interference before the modulator. When using IDACs for RTD excitation, verify IDAC compliance voltage headroom across the full sensor resistance range; if headroom is exceeded, excitation collapses and readings clip. Ratio-metric RTD wiring using the internal reference cancels IDAC drift.
Keep REFN0/REFP0 traces short, Kelvin-routed to the reference source, and shunted with a low-ESR 1-uF capacitor close to the pins. If using an external precision reference such as the REF50xx family instead of the internal 2.5V reference, buffer it appropriately per the TI ADS1263 datasheet typical application to avoid reference loading errors.
Thông tin tuân thủ
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