ADS1212PG4 - 22-Bit Delta-Sigma ADC, 18-PDIP | Texas Instruments
MPN: ADS1212PG4 ✗ پایان تولیدADS1212PG4 نمای کلی
A delta-sigma ADC is a type of oversampling converter that trades speed for resolution by pushing quantization noise to high frequencies, where it is filtered out by a digital decimation filter. The ADS1212PG4 sits within the broader hierarchy of analog-to-digital converters -> precision ADCs -> delta-sigma ADCs -> data-acquisition ICs, and belongs to the power-management CMOS family of mixed-signal products. This category of converter is widely chosen over successive-approximation (SAR) ADCs in slow, high-resolution applications such as weigh scales, strain-gauge bridges, and temperature measurement, where noise rejection at 50 Hz and 60 Hz mains frequencies is required.
Key features include 22-bit resolution with no missing codes, a low 1.4 mW power dissipation, differential analog inputs, an on-chip programmable gain amplifier with gain settings typically from 1 to 16, and an SPI-compatible synchronous serial interface (SSI) for host communication. The modulator sampling rate and digital filter characteristics are user-programmable through the serial interface, allowing trade-offs between resolution, data rate, and noise. An on-chip calibration engine supports both self-calibration and system-calibration modes to correct offset and gain errors.
Typical applications include industrial weigh scales, precision load-cell readouts, RTD and thermocouple temperature measurement, chromatography and blood-gas analyzers, and other low-frequency precision instrumentation where wide dynamic range is needed. The combination of 22-bit resolution and a built-in PGA allows direct connection to low-output transducers without external instrumentation amplifiers.
When designing with the ADS1212PG4, observe the decoupling requirements of the analog and digital sections: a clean 5V rail with separate AVCC and DVCC pins must be tied together at a single point with proper decoupling. The differential input pair must be kept away from digital switching traces on the PCB to preserve CMRR. Because the part is in a PDIP through-hole package, it is typically chosen for prototyping and industrial backplanes rather than high-density SMT designs.
This page synthesizes distributor pricing, drop-in alternative listings, and engineering design notes not collected in a single place in the manufacturer datasheet.
جایگزین‌های drop-in برای ADS1212PG4 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
ADS1212P
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS1212PG4
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS1212PAG4
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS1213PG4
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
ADS1212PG4 حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 22 bits (no missing codes) |
| Architecture | Delta-Sigma (4th-order modulator) |
| Number of Input Channels | 1 differential |
| نرخ نمونه‌برداری | 6.25 kSPS (max) |
| Effective Resolution at 10 Hz | 20 bits |
| Effective Resolution at 1 kHz | 16 bits |
| Power Dissipation | 1.4 mW (typical) |
| Differential Inputs | Yes |
| Data Interface | Serial, SPI-compatible SSI |
| دمای کاری | -40C to +85C |
| Temperature Grade | Industrial |
| بسته‌بندی | 18-PDIP (0.300 inch, 7.62 mm) |
| نوع نصب | Through-Hole |
| Packaging | Tube |
| Number of Terminals | 18 |
| Terminal Form | Through-Hole |
پیکربندی پین ADS1212PG4
| پین 1 | AVDD — Analog supply voltage (5V nominal) |
| پین 2 | AGND — Analog ground |
| پین 3 | VBIAS — Bias voltage output [DATA_NEEDED: exact function in datasheet] |
| پین 4 | AINP — Differential analog input, positive |
| پین 5 | AINN — Differential analog input, negative |
| پین 6 | VREF+ — Positive reference voltage input |
| پین 7 | VREF- — Negative reference voltage input (typically AGND) |
| پین 8 | MODE — Mode select / calibration control [DATA_NEEDED: exact function] |
| پین 9 | SCLK — Serial interface clock input |
| پین 10 | SDIO — Serial data input/output (SPI MISO/MOSI shared) |
| پین 11 | DRDY — Data ready output (active low) |
| پین 12 | SYNC/PDWN — Synchronization or power-down control input |
| پین 13 | XIN — Crystal oscillator input [DATA_NEEDED: exact function] |
| پین 14 | XOUT — Crystal oscillator output [DATA_NEEDED: exact function] |
| پین 15 | DVDD — Digital supply voltage (5V nominal) |
| پین 16 | DGND — Digital ground |
| پین 17 | CAP — Decoupling capacitor pin [DATA_NEEDED: function] |
| پین 18 | NC — Not connected (per datasheet) |
کاربردهای معمول
ADS1212PG4 مناسب است برای 6 کاربردs: Industrial Weigh Scale Readout, Precision Load-Cell Signal Conditioning, RTD and Thermocouple Temperature Measurement, Medical Analyzer Signal Acquisition, Strain-Gauge Bridge Instrumentation, Industrial Process Control Analog Input Module.
Industrial Weigh Scale Readout
The ADS1212PG4 fits industrial weigh scale designs because of its 22-bit no-missing-codes resolution, on-chip PGA with gain up to 16, and differential inputs that connect directly to a 4-arm strain-gauge bridge. With 20 effective bits at a 10 Hz output rate, it captures sub-gram weight resolution across a multi-kilogram range while built-in 50 Hz / 60 Hz digital filter notch rejection rejects mains-induced noise common on factory floors. Power consumption of 1.4 mW allows battery-powered portable scales, and the 18-PDIP package is convenient for prototype and low-volume weigh-scale backplanes. Companion parts: OPA2277 (instrumentation-amp alternative), REF5025 (low-noise 2.5V reference).
پیشنهادی
Precision Load-Cell Signal Conditioning
The ADS1212PG4 directly digitizes the differential millivolt output of a load cell without an external instrumentation amplifier, because its on-chip PGA amplifies low-mV bridge outputs to the ADC's full-scale range. The 22-bit resolution and self-calibration routine correct offset and gain drift across the operating temperature range of -40C to +85C. The SPI-compatible SSI port allows a microcontroller to read weigh values at up to 6.25 kSPS and apply software filtering. The 18-PDIP package is preferred for through-hole industrial mounting. Companion parts: TL431 (shunt reference), or an external low-noise LDO such as TPS7A4701.
پیشنهادی
RTD and Thermocouple Temperature Measurement
The ADS1212PG4 is well-matched to RTD and thermocouple temperature measurement front-ends, where microvolt-level signals must be digitized with high common-mode rejection. The differential input pair rejects common-mode noise from long sensor cables, while the PGA amplifies the low-amplitude thermocouple Seebeck voltage (typically 10-50 uV per degree C). At a 10 Hz output data rate the effective resolution of 20 bits gives sub-0.01C measurement resolution when paired with a PT100 RTD. The SPI interface streams conversions directly to a host microcontroller for cold-junction compensation. Companion parts: OPA2277 (precision op-amp), ADS1110A3IDBVRG4 (secondary temperature channel).
پیشنهادی
Medical Analyzer Signal Acquisition
The ADS1212PG4 serves medical analyzer front-ends such as blood-gas and chromatography instruments, where low-frequency precision analog signals from ion-selective electrodes and optical detectors must be digitized with high dynamic range. The 22-bit resolution and on-chip PGA allow direct measurement of microamp-level sensor currents when paired with a transimpedance front-end. Low 1.4 mW power dissipation reduces thermal load inside temperature-controlled analyzer enclosures. The 18-PDIP package is convenient for medical device prototypes that must be reworkable and serviceable. Companion parts: AD8628 (zero-drift amplifier), REF5025 (precision reference).
پیشنهادی
Strain-Gauge Bridge Instrumentation
The ADS1212PG4 digitizes the differential output of strain-gauge bridges used in structural-health monitoring, pressure transducers, and torque sensors. The on-chip PGA gain up to 16 boosts the millivolt-level bridge output to the ADC input range, eliminating an external instrumentation amplifier stage. Self-calibration and system-calibration modes correct offset and gain errors at power-up, ensuring long-term stability in field installations. The differential inputs reject common-mode pickup from motor drives. Companion parts: REF5025 (precision reference), OPA2277 (low-noise op-amp).
پیشنهادی
Industrial Process Control Analog Input Module
The ADS1212PG4 fits PLC and DCS analog input modules that accept 4-20 mA or 0-10V process signals. A precision sense resistor and the on-chip PGA scale the loop current to the ADC differential input range. The 22-bit resolution captures process variables such as pressure, flow, and level with 0.001% of full-scale resolution. The 18-PDIP package is widely used in industrial backplane modules that require through-hole mounting for mechanical robustness. Companion parts: ADS1110A6IDBVR (auxiliary ADC channel), REF5025 (precision reference).
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ADS1212PG4 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ADS1212P | ADS1212PG4 | ADS1212PAG4 | ADS1213PG4 | ADS1251U |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 18-PDIP | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same | SOIC-14 - different |
| Resolution | 22 bits | 22 bits | 22 bits | 22 bits | 24 bits | 24 bits |
| Differential Inputs | Yes | Yes | Yes | Yes | Yes | Yes |
| On-chip PGA | Yes (1-16) | Yes (1-16) | Yes (1-16) | Yes (1-16) | Yes | Yes (1-8) |
| Interface | SPI-compatible SSI | SPI-compatible SSI | SPI-compatible SSI | SPI-compatible SSI | SPI-compatible SSI | SPI-compatible SSI |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active |
تفاوت‌های کلیدی
- Same 18-PDIP pinout across the ADS1212 family allows simple stock-channel substitution (در مقابلADS1212U/1K)
- True drop-in within PDIP-18 family across G4/P/PA suffix variants (در مقابلADS1212U/1K)
- 22-bit no-missing-codes resolution with on-chip PGA up to gain 16 (در مقابلADS1110A6IDBVR)
یادداشت‌های طراحی
The ADS1212PG4 requires a clean 5V supply with separate AVCC (pin 1) and DVCC (pin 15) pins. Place a 10 uF bulk capacitor and a 0.1 uF ceramic decoupling capacitor close to each supply pin, and tie AVCC and DVCC together at a single point with a ferrite bead to prevent digital switching noise from coupling into the analog section. According to the datasheet decoupling recommendations, inadequate supply decoupling is the most common cause of degraded noise performance.
Keep the differential analog input traces (AINP, AINN) short and symmetric, and route them away from digital switching signals such as SCLK and SDIO. Use a guard trace tied to AGND around the input pair if long cable connections are needed. The 18-PDIP through-hole footprint allows a ground plane on the opposite PCB side for shielding; place a continuous ground pour under the device body.
Do not connect AVDD and DVDD to separate regulators without tying AGND and DGND at a single point. The VREF+/- pins must be driven by a low-impedance precision reference such as REF5025 - voltage-reference noise directly multiplies through the ADC gain. Self-calibration (initiated through the MODE pin or serial interface) should be run at power-up and after any temperature change of more than 10C to remove offset and gain drift.
The on-chip digital filter provides 50 Hz and 60 Hz mains-frequency rejection at lower data rates; verify the chosen output data rate places a filter notch at the local mains frequency. SPI clock rates above 1 MHz may inject digital noise into the analog front-end - keep SCLK below 2 MHz and add a small RC filter on SCLK/SDIO traces if noise coupling is observed.
اطلاعات انطباق
G4 suffix indicates Pb-free / RoHS-compliant per TI product family convention. Not AEC-Q100 qualified (industrial grade only).
