ADS8402IPFBRG4 - 16-Bit 1.25MSPS Parallel ADC w/Ref | TI
料号： ADS8402IPFBRG4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $19.5 | $19.50 |
| 10 | $17.2 | $172.00 |
| 100 | $14.85 | $1,485.00 |
| 500 | $12.4 | $6,200.00 |
| 1,000 | $10.95 | $10,950.00 |
ADS8402IPFBRG4 概述
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.
直接替换替代料： ADS8402IPFBRG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS8402IPFBRG4 （相同外形与封装尺寸） ——差异在于 Package, Input Type, Conversion Time, Architecture, Resolution.
快速对比工具——选择替代料号进行并排对比：
ADS8401IPFBRG4
✅ 直接替换✓ 有现货
$11.75 / 个
查看数据手册 →ADS8383IPFBRG4
✅ 直接替换✓ 有现货
$11.95 / 个
查看数据手册 →ADS8382IRHPR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$9.65 / 个
查看数据手册 →ADS8318IDRCR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.85 / 个
查看数据手册 →ADS8402IPFBRG4 最大额定值与电气特性
| 分辨率 | 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) |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 48-pin TQFP (PFB) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ADS8402IPFBRG4 引脚配置
| 引脚 1 | AVDD — Analog 5 V supply |
| 引脚 2 | GND — Analog ground |
| 引脚 3 | IN+ — Unipolar differential analog input positive |
| 引脚 4 | IN- — Unipolar differential analog input negative |
| 引脚 5 | REF — Internal 4.096 V reference output / bypass |
| 引脚 6 | GND — Analog ground |
| 引脚 7 | CONVST — Conversion start input |
| 引脚 8 | BUSY — Conversion in progress output |
| 引脚 9 | CS — Chip select input |
| 引脚 10 | RD — Read input |
| 引脚 11 | D0 — Parallel data bus bit 0 (LSB) |
| 引脚 12 | D1 — Parallel data bus bit 1 |
| 引脚 13 | D2 — Parallel data bus bit 2 |
| 引脚 14 | D3 — Parallel data bus bit 3 |
| 引脚 15 | D4 — Parallel data bus bit 4 |
| 引脚 16 | D5 — Parallel data bus bit 5 |
| 引脚 17 | D6 — Parallel data bus bit 6 |
| 引脚 18 | D7 — Parallel data bus bit 7 |
| 引脚 19 | DVDD — Digital supply 2.95 V to 5.25 V |
| 引脚 20 | DGND — Digital ground |
| 引脚 21 | D8 — Parallel data bus bit 8 |
| 引脚 22 | D9 — Parallel data bus bit 9 |
| 引脚 23 | D10 — Parallel data bus bit 10 |
| 引脚 24 | D11 — Parallel data bus bit 11 |
| 引脚 25 | D12 — Parallel data bus bit 12 |
| 引脚 26 | D13 — Parallel data bus bit 13 |
| 引脚 27 | D14 — Parallel data bus bit 14 |
| 引脚 28 | D15 — Parallel data bus bit 15 (MSB) |
| 引脚 29 | BYTE — Bus width select (8/16-bit mode) |
| 引脚 30 | NC — Not connected (per datasheet) |
| 引脚 31 | NC — Not connected (per datasheet) |
| 引脚 32 | NC — Not connected (per datasheet) |
| 引脚 33 | NC — Not connected (per datasheet) |
| 引脚 34 | NC — Not connected (per datasheet) |
| 引脚 35 | NC — Not connected (per datasheet) |
| 引脚 36 | NC — Not connected (per datasheet) |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
| 引脚 41 | NC — Not connected (per datasheet) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | AGND — Analog ground |
| 引脚 44 | AVDD — Analog 5 V supply |
| 引脚 45 | AVDD — Analog 5 V supply |
| 引脚 46 | AGND — Analog ground |
| 引脚 47 | AGND — Analog ground |
| 引脚 48 | AVDD — Analog 5 V supply |
典型应用
ADS8402IPFBRG4 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ADS8402IPFBRG4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- 20% higher sample rate in identical 48-pin TQFP (PFB) footprint （对比 ADS8401IPFBRG4)
- Integrated 4.096 V reference (vs external reference for ADS8382IRHPR) （对比 ADS8382IRHPR)
- Higher resolution than ADS8383IPFBRG4 at comparable sample rate （对比 ADS8383IPFBRG4)
设计说明
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.
合规信息
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.