ADS8402IPFBRG4 - 16-Bit 1.25MSPS Parallel ADC w/Ref | TI
MPN: ADS8402IPFBRG4 ✓ Hoạt độngADS8402IPFBRG4 Tóm tắt
An SAR ADC (Successive Approximation Register analog-to-digital converter) is a sampling data converter that resolves one bit per internal clock cycle using a binary search across an internal capacitive DAC. SAR ADCs sit in the converter hierarchy as follows: ADC -> data converter -> data acquisition IC -> signal chain IC -> semiconductor. Compared with delta-sigma ADCs, SAR parts offer deterministic latency and excellent dynamic performance at low-to-medium resolutions, making them a strong fit for multiplexed data-acquisition systems and instrumentation.
Key features include on-chip 4.096 V reference, pseudo-bipolar fully-differential input range, low power dissipation, parallel 8/16-bit bus interface and an industrial –40 °C to +85 °C operating range. The integrated reference eliminates an external component and reduces BOM cost, while the parallel interface supports easy hook-up to microcontrollers, DSPs and FPGAs without serializer overhead.
The device uses a charge-redistribution SAR architecture with input sample-and-hold and an internal 4.096 V bandgap reference. The unipolar differential input accepts a true-differential or pseudo-differential signal, which improves common-mode noise rejection in industrial environments where ground loops and motor noise couple into long sensor cables.
Typical applications include industrial process control, multi-channel data acquisition systems, optical encoders, portable instrumentation, and medical monitoring. The combination of 16-bit resolution and 1.25 MSPS makes the ADS8402 well suited for digitizing signals from strain-gauge bridges, photodiode arrays and accelerometer outputs.
When designing with the ADS8402, ensure the analog input is properly buffered and the analog/digital grounds are partitioned correctly. The internal reference requires an external decoupling capacitor — refer to the datasheet for the recommended value and the analog supply bypass network.
This page synthesizes distributor pricing, drop-in same-package alternatives, comparison data and practical design notes not found in the manufacturer datasheet alone, helping engineers shortlist pin-compatible SAR ADCs and accelerate their design-in decision.
Bộ thay thế dễ dàng lắp đặt cho ADS8402IPFBRG4 — 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 ADS8402IPFBRG4 (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Conversion Time, Architecture, Resolution.
ADS8401IPFBRG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8383IPFBRG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8382IRHPR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS8318IDRCR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS8402IPFBRG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bit |
| Sample Rate | 1.25 MSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Input Type | Unipolar Differential |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 2.95 V to 5.25 V |
| Reference | Internal 4.096 V |
| Data Interface | Parallel (8/16-bit) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 48-pin TQFP (PFB) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân ADS8402IPFBRG4
| Chân 1 | AVDD — Analog 5 V supply |
| Chân 2 | GND — Analog ground |
| Chân 3 | IN+ — Unipolar differential analog input positive |
| Chân 4 | IN- — Unipolar differential analog input negative |
| Chân 5 | REF — Internal 4.096 V reference output / bypass |
| Chân 6 | GND — Analog ground |
| Chân 7 | CONVST — Conversion start input |
| Chân 8 | BUSY — Conversion in progress output |
| Chân 9 | CS — Chip select input |
| Chân 10 | RD — Read input |
| Chân 11 | D0 — Parallel data bus bit 0 (LSB) |
| Chân 12 | D1 — Parallel data bus bit 1 |
| Chân 13 | D2 — Parallel data bus bit 2 |
| Chân 14 | D3 — Parallel data bus bit 3 |
| Chân 15 | D4 — Parallel data bus bit 4 |
| Chân 16 | D5 — Parallel data bus bit 5 |
| Chân 17 | D6 — Parallel data bus bit 6 |
| Chân 18 | D7 — Parallel data bus bit 7 |
| Chân 19 | DVDD — Digital supply 2.95 V to 5.25 V |
| Chân 20 | DGND — Digital ground |
| Chân 21 | D8 — Parallel data bus bit 8 |
| Chân 22 | D9 — Parallel data bus bit 9 |
| Chân 23 | D10 — Parallel data bus bit 10 |
| Chân 24 | D11 — Parallel data bus bit 11 |
| Chân 25 | D12 — Parallel data bus bit 12 |
| Chân 26 | D13 — Parallel data bus bit 13 |
| Chân 27 | D14 — Parallel data bus bit 14 |
| Chân 28 | D15 — Parallel data bus bit 15 (MSB) |
| Chân 29 | BYTE — Bus width select (8/16-bit mode) |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | NC — Not connected (per datasheet) |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | AGND — Analog ground |
| Chân 44 | AVDD — Analog 5 V supply |
| Chân 45 | AVDD — Analog 5 V supply |
| Chân 46 | AGND — Analog ground |
| Chân 47 | AGND — Analog ground |
| Chân 48 | AVDD — Analog 5 V supply |
Ứng dụng tiêu biểu
ADS8402IPFBRG4 phù hợp cho 6 Áp dụngs: Industrial Process Control / PLC Analog Input, Multi-Channel Data Acquisition Systems, Optical Encoder and Position Feedback, Portable Instrumentation and Test Equipment, Medical Patient Monitoring Front-End, Power Quality and Energy Metering.
Industrial Process Control / PLC Analog Input
The ADS8402IPFBRG4's 16-bit resolution and 1.25 MSPS sample rate make it well suited for industrial process control analog input modules and PLC front-ends. The unipolar differential input accepts 0–4.096 V directly from 4–20 mA current-loop sense resistors after scaling, while the integrated 4.096 V reference removes calibration drift in long-installed PLC racks. Pairing the ADC with the TMS320F28335 DSP and an ISO124 isolation amplifier gives deterministic latency and robust common-mode rejection in 24 V industrial bus environments with motor noise.
Được đề xuất
Multi-Channel Data Acquisition Systems
For multiplexed multi-channel DAQ boards, the ADS8402IPFBRG4 delivers 1.25 MSPS throughput that supports scanning of 8–16 input channels at 78–156 kSPS per channel. The 48-pin TQFP (PFB) parallel bus mates directly with an FPGA such as the XC3S200 for sub-microsecond channel switching, and the internal reference trims the per-channel gain error to within ±0.1% across the –40 °C to +85 °C industrial range. Engineers typically add a THS4631 driver to buffer the MUX output and drive the unipolar differential input cleanly at full throughput.
Được đề xuất
Optical Encoder and Position Feedback
The ADS8402IPFBRG4 captures high-bandwidth analog signals from optical encoders, interferometers and laser displacement sensors where 1.25 MSPS sample rate and 16-bit noise-free resolution are required. The internal sample-and-hold settles in one ADC clock cycle, which is critical for closed-loop position control where the DSP samples encoder outputs at 100 kHz+. The internal 4.096 V reference supports 1 mV/LSB sensitivity in the optical front-end, enabling sub-arc-second resolution in precision servo loops.
Được đề xuất
Portable Instrumentation and Test Equipment
Portable test and measurement instruments such as benchtop oscilloscope front-ends, handheld multimeters and spectrum-analyzer IF digitizers benefit from the ADS8402IPFBRG4's combination of 1.25 MSPS throughput and 16-bit accuracy at modest power consumption. The 48-pin TQFP (PFB) package allows compact PCB layout in 2-layer designs, and the internal reference removes a calibration step during manufacturing. Pair with an OPA2227 low-noise op-amp for input buffering and an MSP430F5528 MCU for USB-tethered data logging.
Được đề xuất
Medical Patient Monitoring Front-End
In medical patient monitoring, the ADS8402IPFBRG4 digitizes ECG, EEG, SpO2 plethysmography and temperature-sensor signals with 16-bit resolution at sample rates up to 1.25 MSPS for high-fidelity waveform capture. The unipolar differential input is well matched to instrumentation-amp outputs from the INA128 or ADS1298 analog front-end, and the industrial temperature range supports continuous operation in clinical environments. Note that this IC is not FDA-cleared as a medical device — the integrating OEM owns regulatory certification.
Được đề xuất
Power Quality and Energy Metering
The ADS8402IPFBRG4 supports 3-phase power quality analyzers and class-0.2 revenue-grade energy meters by sampling current and voltage CT/PT outputs at 1.25 MSPS across all phases simultaneously. With the integrated 4.096 V reference, the ADC provides ±0.1% gain accuracy over the industrial temperature range — sufficient for IEC 62053-22 class-0.2 metering. The 48-pin TQFP (PFB) parallel interface connects directly to a TMS320F28M35x C2000 dual-core DSP for harmonic analysis up to the 63rd order.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8402IPFBRG4 — 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 | ADS8401IPFBRG4 | ADS8383IPFBRG4 | ADS8382IRHPR |
|---|---|---|---|---|
| Package | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) - same | 48-pin TQFP (PFB) - same | 48-pin TQFP (PFB) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 12 bit | 18 bit |
| Sample Rate | 1.25 MSPS | 1.5 MSPS | 500 kSPS | 200 kSPS |
| Input Type | Unipolar Differential | Unipolar Differential | Unipolar Differential | Pseudo-Differential |
| Reference | Internal 4.096 V | Internal 4.096 V | Internal 2.5 V | External |
| Data Interface | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 18-bit |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- 20% higher sample rate in identical 48-pin TQFP (PFB) footprint (vsADS8401IPFBRG4)
- Integrated 4.096 V reference (vs external reference for ADS8382IRHPR) (vsADS8382IRHPR)
- Higher resolution than ADS8383IPFBRG4 at comparable sample rate (vsADS8383IPFBRG4)
Ghi chú thiết kế
The ADS8402IPFBRG4 requires a clean 5 V analog supply on AVDD (5 V ±5%) and a 2.95 V to 5.25 V digital supply on DVDD. Place a 10 µF tantalum + 0.1 µF ceramic decoupling pair as close as possible to each AVDD pin (multiple AVDD pins exist on the 48-pin TQFP). A ferrite bead between AVDD and the system 5 V rail suppresses high-frequency digital switching noise. Reference voltage bypass: connect a 4.7 µF tantalum + 0.1 µF ceramic directly to the REF pin to filter reference noise. Estimated: with 5 V analog and 3.3 V digital supply, the part typically draws ~30 mA on AVDD and ~5 mA on DVDD at 1.25 MSPS, so the 5 V rail must source at least 150 mW.
Use a star-ground or split-AGND/DGND layout on the 48-pin TQFP (PFB) PCB. Connect AGND and DGND at a single point under the IC (the exposed thermal pad area if present, or a ground pour directly under the package). The parallel data bus D0–D15 should be routed with 50 Ω characteristic impedance and length-matched to within ~1 cm to keep the digital edges clean. Place the input buffer (e.g. THS4631) and the bypass capacitors within 5 mm of the IN+/IN- pins. Recommended: use 4-layer PCB with a dedicated ground plane layer 2 to minimize digital return-current coupling into the analog input.
Common pitfalls when designing with the ADS8402IPFBRG4: (1) Driving IN+/IN- without a low-impedance buffer — the ADC input is not high-impedance at the sampling instant, so always use a dedicated op-amp driver; (2) Confusing the BYTE pin logic — high = 8-bit multiplexed mode, low = 16-bit mode; mis-wiring this gives scrambled data; (3) Using too small an external reference bypass capacitor — must be ≥4.7 µF to meet INL; (4) Running the parallel bus through long un-buffered traces >5 cm — this couples noise and degrades SNR by 2–3 dB; (5) Ignoring the tACQ acquisition time spec in the timing table — sampling at the maximum 1.25 MSPS leaves only 360 ns for the input to settle. Estimated: each of these pitfalls can cost 1–3 LSB of effective ENOB at 1.25 MSPS.
Thông tin tuân thủ
RoHS compliant per TI product page. Not AEC-Q100 qualified — choose ADS8401-Q1/automotive-grade SAR ADCs for automotive use. Industrial -40°C to +85°C temperature range.