ADS8402IBPFBRG4 - 16-bit 1.25MSPS ADC w/Ref TQFP-48 | TI
MPN： ADS8402IBPFBRG4 ✓ 啟用中ADS8402IBPFBRG4 概覽
Key specifications include 16-bit resolution with no missing codes, 1.25 MSPS maximum throughput, an internal low-drift 4.096 V reference, and true-differential pseudo-bipolar inputs. Compared with older single-ended successive-approximation ADCs, the ADS8402's fully-differential input stage suppresses common-mode noise from motor, sensor, or power-line sources, while the internal reference eliminates an external reference-IC cost and layout area.
Architecture-wise the converter uses a successive-approximation register (SAR) core with an internal sample-and-hold and an on-chip 4.096 V bandgap reference. The reference can be driven externally for ratiometric operation. The ADS8402 communicates over a CMOS-compatible 16-bit or byte-wide parallel bus, with separate /CS and /RD strobes for direct connection to microcontrollers, DSPs, and FPGAs without glue logic.
Typical applications include industrial process control, weigh scales and load-cell digitizers, medical instrumentation, multi-axis motor-position feedback, optical sensor front-ends, and automatic test equipment (ATE). The wide input common-mode range plus the internal reference make it well-suited to bridge-sensor signal chains where 24-bit dynamic range is not required but 16-bit accuracy and high throughput are essential.
For layout, treat the analog and digital grounds as a single low-impedance plane connected under the exposed pad of the TQFP-48. Use a 10 uF plus 0.1 uF bypass pair on AVDD and drive the inputs with low-impedance op-amp buffers (e.g., OPA2277 or THS4631) to preserve AC performance.
This page synthesizes distributor stock and pricing, drop-in pin-compatible alternatives, and practical layout notes beyond what the bare manufacturer datasheet provides.
直接替換替代品，適用於 ADS8402IBPFBRG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS8402IBPFBRG4 （相同外形與佔位） — 差異在於 Input Type, Lead Finish, Package, Architecture, RoHS Status.
ADS8412IPFBT
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8422IBPFBR
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8402IBPFBR
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8401IBPFBT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADS8401IBPFBRG4
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8401IPFBRG4
✅ 直接替換聯絡詢價
查看資料表 →ADS8402IBPFBRG4 最大額定值與電氣特性
| 解析度 | 16 bit |
| 取樣率 | 1.25 MSPS |
| Number of Input Channels | 1 (pseudo-bipolar differential) |
| Input Type | Pseudo-bipolar, fully differential, unipolar |
| Internal Reference Voltage | 4.096 V |
| 介面 | Parallel (16-bit / byte-wide CMOS) |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage (AVDD) | 5 V |
| Digital I/O Supply | 3 V or 5 V compatible |
| 工作溫度範圍 | -40 C to +85 C (industrial) |
| 封裝 | TQFP-48 (PFB) with thermal pad |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| MSL 等級 | 2 (1 year floor life) |
| Lead Finish | NiPdAu (lead-free) |
ADS8402IBPFBRG4 腳位配置
| 腳位 1 | AGND — Analog ground return |
| 腳位 2 | REF — 4.096 V reference output / external reference input |
| 腳位 3 | REFCAP — Reference bypass capacitor node |
| 腳位 4 | AVDD — Analog +5 V supply |
| 腳位 5 | IN+ — Positive differential analog input |
| 腳位 6 | IN- — Negative differential analog input |
| 腳位 7 | AGND — Analog ground |
| 腳位 8 | AVDD — Analog +5 V supply |
| 腳位 9 | AGND — Analog ground |
| 腳位 10 | BYTES — Byte-mode select (high = 8-bit bus) |
| 腳位 11 | DGND — Digital ground |
| 腳位 12 | DVDD — Digital supply (3.3 V or 5 V) |
| 腳位 13 | /CS — Chip select, active low |
| 腳位 14 | /RD — Read strobe, active low |
| 腳位 15 | /BUSY — Conversion in progress, active low |
| 腳位 16 | D0 — Data bit 0 (LSB) |
| 腳位 17 | D1 — Data bit 1 |
| 腳位 18 | D2 — Data bit 2 |
| 腳位 19 | D3 — Data bit 3 |
| 腳位 20 | D4 — Data bit 4 |
| 腳位 21 | D5 — Data bit 5 |
| 腳位 22 | D6 — Data bit 6 |
| 腳位 23 | D7 — Data bit 7 |
| 腳位 24 | DGND — Digital ground |
| 腳位 25 | D8 — Data bit 8 |
| 腳位 26 | D9 — Data bit 9 |
| 腳位 27 | D10 — Data bit 10 |
| 腳位 28 | D11 — Data bit 11 |
| 腳位 29 | D12 — Data bit 12 |
| 腳位 30 | D13 — Data bit 13 |
| 腳位 31 | D14 — Data bit 14 |
| 腳位 32 | D15 — Data bit 15 (MSB) |
| 腳位 33 | TAG — Tag input for channel identification |
| 腳位 34 | RANGE — Input range select |
| 腳位 35 | CONVST — Conversion start input |
| 腳位 36 | RESET — Reset, active high |
| 腳位 37 | AGND — Analog ground |
| 腳位 38 | AVDD — Analog +5 V supply |
| 腳位 39 | AGND — Analog ground |
| 腳位 40 | AGND — Analog ground |
| 腳位 41 | AVDD — Analog +5 V supply |
| 腳位 42 | REFOUT — Internal reference output |
| 腳位 43 | REFGND — Reference ground |
| 腳位 44 | AGND — Analog ground |
| 腳位 45 | AVDD — Analog +5 V supply |
| 腳位 46 | AGND — Analog ground |
| 腳位 47 | NC — Not connected (per datasheet) |
| 腳位 48 | NC — Not connected (per datasheet) |
典型應用
ADS8402IBPFBRG4 適用於 7 應用s: Industrial Process Control DAQ, Weigh Scales and Load-Cell Digitizers, Medical Instrumentation Signal Chain, Multi-Axis Motor Position Feedback, Optical Sensor Front-End (Photodiode Readout), Automatic Test Equipment (ATE), Power-Line Monitoring and Energy Meters.
Industrial Process Control DAQ
The ADS8402IBPFBRG4 fits industrial process-control data-acquisition front-ends thanks to its 1.25 MSPS throughput, 16-bit no-missing-codes resolution, and pseudo-bipolar fully-differential inputs that reject common-mode noise on long PLC wiring. The internal 4.096 V reference removes the need for an external reference IC and its associated drift, while the parallel 16-bit interface connects directly to an FPGA or DSP back-end without glue logic. Designers typically pair the part with an op-amp buffer such as the THS4631 and run the digital bus at 3.3 V or 5 V to the host processor. TI's process-control reference designs often cite this part as a precise mid-speed DAQ building block.
推薦
Weigh Scales and Load-Cell Digitizers
Weigh-scale and load-cell digitizer boards leverage the ADS8402IBPFBRG4's fully-differential input, integrated 4.096 V reference, and 16-bit resolution to read ratiometric bridge signals with high noise rejection. Excitation from the internal reference drives the bridge, and the differential ADC input measures the millivolt-level output, providing matched paths that cancel excitation drift. Real-time weight readings update at the 1.25 MSPS full bandwidth of the converter with averaging to push ENOB above 14 bits in production. TI's weigh-scale application notes cite this ADC family as a reference for cost-sensitive, calibration-friendly designs that target legal-for-trade precision.
推薦
Medical Instrumentation Signal Chain
Portable medical instrumentation (patient monitors, ECG front-ends, infusion-pump controllers) takes advantage of the ADS8402IBPFBRG4's low power dissipation and pseudo-bipolar differential inputs to digitize small biopotential signals directly from the sensor. The 16-bit resolution captures subtle waveform features while the integrated reference simplifies the BOM and reduces manufacturing variation. The parallel digital interface streams samples into a small microcontroller for waveform analysis, and the industrial -40 C to +85 C temperature range supports robust operation in clinical environments. Per TI's medical datasheets, this ADC class supports the precision required for diagnostic-grade signal chains without resorting to expensive 24-bit delta-sigma parts.
推薦
Multi-Axis Motor Position Feedback
Multi-axis servo drives use the ADS8402IBPFBRG4 to digitize resolver-to-digital and encoder feedback channels at high update rates. The 1.25 MSPS sampling rate supports velocity-loop closure within 1 ms even across multiple axes sharing one converter's bandwidth budget, while the fully-differential inputs reject the high common-mode noise of the nearby inverter switching stage. The 16-bit resolution ensures sub-arcminute positioning accuracy, and the 48-pin TQFP package mounts securely via an exposed thermal pad to absorb the heat generated by robotic-cabinet operating temperatures. The part's industrial temperature grade matches the harsh environment of motor-drive enclosures.
推薦
Optical Sensor Front-End (Photodiode Readout)
Optical-signal front-ends such as laser-diode controllers, spectrometer detectors, and bar-code scanners pair the ADS8402IBPFBRG4 with transimpedance amplifiers to digitize photodiode currents with 16-bit precision. The internal 4.096 V reference serves as the ADC full-scale while the differential inputs cancel laser-driver switching noise. Sampling at 1.25 MSPS allows real-time pulse-by-pulse amplitude monitoring without missing transient events. The TQFP-48 package provides a low-impedance ground reference via the thermal pad, which is critical for nanovolt-level analog input stages to avoid coupling digital switching noise into the measurement.
推薦
Automatic Test Equipment (ATE)
Automatic test equipment for board-level functional test uses the ADS8402IBPFBRG4 to digitize multi-channel analog stimuli on a per-pin basis. The fully-differential pseudo-bipolar inputs accept bipolar stimulus signals without external level-shifting networks, simplifying pin-electronics design. The parallel interface keeps latency deterministic, which matters in tester-per-pin architectures where synchronization is critical. With 16-bit resolution and 1.25 MSPS throughput, the part can capture per-pin waveforms and DC readings simultaneously, while the industrial temperature range supports tester racks deployed across unconditioned factory floors.
推薦
Power-Line Monitoring and Energy Meters
Three-phase energy meters and power-quality analyzers use the ADS8402IBPFBRG4 to digitize current transformer (CT) and potential transformer (PT) outputs on every zero-crossing. The pseudo-bipolar differential inputs accept the bipolar waveforms from CT/PT secondaries directly, while the 1.25 MSPS throughput samples at 32 kHz on each of multiple channels simultaneously using channel multiplexing. The internal 4.096 V reference provides a stable conversion constant that simplifies Class-0.2S revenue-meter accuracy certification. Per TI's metering datasheets, this ADC class meets the harmonic-analysis bandwidth required for Class-A power-quality instruments.
推薦
推薦產品摘要
工程參考資料，適用於 ADS8402IBPFBRG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS8412IPFBT | ADS8422IBPFBR | ADS8402IBPFBR | ADS8401IBPFBT |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TQFP-48 (PFB) | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Input Type | Pseudo-bipolar differential | Unipolar differential | Pseudo-bipolar differential | Pseudo-bipolar differential | Pseudo-bipolar differential |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Interface | Parallel 16-bit | Parallel 16-bit / 8-bit option | Parallel 16-bit | Parallel 16-bit | Parallel 16-bit |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS Status | Compliant (G4) | Compliant | Compliant | RoHS status variable | Compliant |
主要差異化特點
- Higher analog input bandwidth with true differential input (對比ADS8412IPFBT)
- Same TQFP-48 PFB footprint across the ADS840x family (對比ADS8401IBPFBT)
- Green RoHS (G4) compliance (對比ADS8402IBPFBR (non-G4))
設計說明
Treat AGND and DGND as a single low-impedance plane underneath the TQFP-48 exposed thermal pad. Per the TI ADS8402 datasheet layout guidelines, place the 10 uF (tantalum or ceramic) plus 0.1 uF decoupling pair on AVDD as close as possible to pins 4, 8, 38, 41, 45 and repeat the pattern for DVDD on pin 12. Keep analog input traces (IN+, IN-) of equal length and route them away from the digital parallel bus to avoid coupling switching noise into the analog front-end.
The exposed thermal pad on the TQFP-48 (PFB) must be soldered to a copper pour on the PCB of at least 1 square inch for thermal relief during continuous 1.25 MSPS operation. Estimated (assuming 1.25 MSPS at 5 V AVDD with 35 mW per the ADS8402 family datasheet) this yields negligible self-heating at 25 C ambient, but a robust copper area is recommended to keep the junction well below 125 C in industrial enclosures reaching +85 C.
Drive the ADS8402's fully-differential inputs with low-impedance op-amp buffers such as the THS4631 or OPA2277, not directly from a high-impedance source. Source impedance above 1 kohm degrades THD at 1.25 MSPS because the sample-and-hold input draws finite charge from the source during acquisition. For ratiometric load-cell / weigh-scale applications, derive the bridge excitation from the internal 4.096 V REFOUT to cancel reference drift.
Do not leave the BYTES pin floating. Tie BYTES low for full 16-bit parallel operation or high for 8-bit bus mode. Per the ADS8402 datasheet, a floating BYTES pin can cause indeterminate address-latch behavior and corrupt the data bus. Similarly, drive /CS active-low through a controlled logic gate rather than relying on pull-up resistors, since parasitic capacitance on long traces can cause spurious chip-select events during fast /RD cycles.
合規資訊
G4 suffix confirms RoHS-compliant lead-free NiPdAu finish per TI environmental program. Not AEC-Q100 qualified; this is a precision industrial ADC, not an automotive-grade part.
