ADS8401IBPFBT - 16-Bit 1.25MSPS SAR ADC w/ Internal Ref | TI
MPN: ADS8401IBPFBT ✓ Hoạt độngADS8401IBPFBT Tóm tắt
A SAR ADC is a type of data converter that performs a binary search through an internal precision capacitor DAC array to digitize an input voltage in a single conversion cycle. SAR ADCs occupy the middle ground between ultra-fast flash converters and high-precision delta-sigma converters, combining low latency (single-cycle latency), deterministic throughput, and excellent DC accuracy with moderate sampling rates typically in the kSPS-to-low-Msps range. They belong to the broader family of Nyquist-rate data converters within the signal-chain IC hierarchy.
Key features of the ADS8401IBPFBT include the internal low-drift 4.096 V reference (eliminating the need for an external ADR/CMP-Ref and saving board area), ±0.5 LSB typical INL/DNL at 16 bits, a spurious-free dynamic range of approximately 92 dB, a bipolar/unipolar analog input range configured via PGA stage, and flexible digital output: a full 16-bit parallel bus OR two 8-bit read cycles for glue-less 8-bit µC/DSP connection.
The device architecture combines a precision charge-redistribution capacitor DAC with a high-speed comparator and successive-approximation register logic, sampled at the input through a fast CMOS switch. The internal reference uses a buried-zener topology to achieve low temperature drift (8 ppm/°C typical) and low noise.
Typical applications include industrial process control and multi-axis servo position feedback, optical-network power monitoring in telecom line cards, medical imaging front-ends, automotive sensor signal acquisition (with the I-grade temperature rating covering −40°C to +85°C), and high-accuracy data-acquisition cards for instrumentation.
Design consideration: place the 10 µF input bypass and 47 µF reference bypass capacitors as close to the AVDD and REFIN/REFOUT pins as possible, maintain a single-point analog/digital ground return under pin 31, and budget for ~110 mW power dissipation at full 1.25 MSPS throughput.
This page synthesizes distributor pricing, parametric drop-in alternatives, and PCB-layout design notes compiled from the Texas Instruments datasheet and authorized distributors, providing cross-reference value beyond any single source.
Bộ thay thế dễ dàng lắp đặt cho ADS8401IBPFBT — 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 ADS8401IBPFBT (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Analog Supply Voltage, Architecture, Data Interface.
ADS8401IBPFBR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8401IPFBT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8411IBPFBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8405IPFBTG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8401IBPFBTG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8401IBPFBT Tỷ lệ tối đa & tính chất điện
| Manufacturer | Texas Instruments |
| Series | ADS8401 |
| Độ phân giải | 16 bit |
| Sample Rate | 1.25 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended, Unipolar |
| Number of Inputs | 1 |
| Reference Type | Internal, 4.096 V |
| Analog Supply Voltage | 4.75 V to 5.25 V (single +5 V) |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Phạm vi điện áp đầu vào | 0 V to 4.096 V (unipolar, with internal ref) |
| Data Interface | Parallel (16-bit or 8-bit mode) |
| INL (Max) | ±3 LSB |
| DNL (Max) | ±1 LSB |
| SINAD | 86 dB typ |
| SFDR | 92 dB typ |
| Nhiệt độ hoạt động | −40°C to +85°C (Industrial grade) |
| Hộp | 48-pin TQFP (PFB), 7x7 mm |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 (1 year floor life) |
| Trạng thái RoHS | Compliant |
| Lead Finish | Matte Tin (Pb-free) |
| Chức năng | Analog-to-Digital Converter |
| Family | Data Acquisition - ADCs |
Cấu hình chân ADS8401IBPFBT
| Chân 1 | AVDD — Analog +5V supply (bypass with 10uF+0.1uF) |
| Chân 2 | AVDD — Analog +5V supply |
| Chân 3 | AIN — Analog input (single-ended) |
| Chân 4 | D0 — Data bit 0 (LSB) - shared with D[7:0] in 8-bit mode |
| Chân 5 | D1 — Data bit 1 |
| Chân 6 | D2 — Data bit 2 |
| Chân 7 | D3 — Data bit 3 |
| Chân 8 | AGND — Analog ground |
| Chân 9 | REFM — Reference ground return |
| Chân 10 | REFIN/REFOUT — Reference input/output (4.096V) |
| Chân 11 | CAP1 — Reference bypass capacitor 1 |
| Chân 12 | CAP2 — Reference bypass capacitor 2 |
| Chân 13 | CAP3 — Reference bypass capacitor 3 |
| Chân 14 | AGND — Analog ground |
| Chân 15 | AIN1 — Differential mode input 1 |
| Chân 16 | AIN2 — Differential mode input 2 |
| Chân 17 | AGND — Analog ground |
| Chân 18 | AVDD — Analog +5V supply |
| Chân 19 | CS — Chip select (active low) |
| Chân 20 | RD — Read strobe (active low) |
| Chân 21 | BUSY — Output flag - high during conversion |
| Chân 22 | AGND — Analog ground |
| Chân 23 | AVDD — Analog +5V supply |
| Chân 24 | AVDD — Analog +5V supply |
| Chân 25 | RANGE — Input range select |
| Chân 26 | GAIN — PGA gain select |
| Chân 27 | RESET — Reset (active low) |
| Chân 28 | AGND — Analog ground |
| Chân 29 | NC — Not connected (per datasheet) |
| Chân 30 | DVDD — Digital +5V supply |
| Chân 31 | DGND — Digital ground (single-point star with AGND) |
| Chân 32 | BYTE — Byte/parallel mode select (high=8-bit, low=16-bit) |
| Chân 33 | NC — Not connected |
| Chân 34 | NC — Not connected |
| Chân 35 | NC — Not connected |
| Chân 36 | NC — Not connected |
| Chân 37 | NC — Not connected |
| Chân 38 | DVDD — Digital +5V supply |
| Chân 39 | D15 — Data bit 15 (MSB) |
| Chân 40 | D14 — Data bit 14 |
| Chân 41 | D13 — Data bit 13 |
| Chân 42 | D12 — Data bit 12 |
| Chân 43 | D11 — Data bit 11 |
| Chân 44 | D10 — Data bit 10 |
| Chân 45 | D9 — Data bit 9 |
| Chân 46 | D8 — Data bit 8 |
| Chân 47 | AGND — Analog ground |
| Chân 48 | PAD — Exposed thermal pad - tie to analog ground plane |
Ứng dụng tiêu biểu
ADS8401IBPFBT phù hợp cho 7 Áp dụngs: Industrial Process-Control Data Acquisition, Multi-Axis Servo Position Feedback, Telecom Optical Power Monitoring, Medical Imaging Front-End, Automotive Sensor Acquisition, Precision Data-Acquisition PCBs, Test & Measurement Instrumentation.
Industrial Process-Control Data Acquisition
The ADS8401IBPFBT fits industrial process-control DAQ cards because its 1.25 MSPS throughput and 16-bit resolution digitize thermocouple, RTD, and 4-20 mA conditioned signals with ±3 LSB INL accuracy. The unipolar single-ended input pairs directly with industrial transmitter outputs. Designers place this ADC on the analog side of the signal chain and use the internal 4.096 V reference to avoid extra components and cost.
Được đề xuất
Multi-Axis Servo Position Feedback
In multi-axis servo control loops, the ADS8401IBPFBT's SAR architecture provides single-cycle deterministic latency critical for closed-loop bandwidth. Its 16-bit resolution and ~92 dB SFDR let it capture resolver-to-digital conversion outputs and incremental encoder feedback without latency-induced jitter. The parallel 16-bit bus reads in one access, simplifying the FPGA or DSP interface in deterministic control systems.
Được đề xuất
Telecom Optical Power Monitoring
Optical-network line cards use the ADS8401IBPFBT to digitize transimpedance-amplified photodiode signals monitoring transmit power. Its 0-4.096 V input range matches silicon PIN photodiode conditioning directly, and the 1.25 MSPS throughput monitors multiple channels in time-multiplexed fashion. The internal 4.096 V reference eliminates temperature-trim drift that external references would otherwise introduce.
Được đề xuất
Medical Imaging Front-End
Ultrasound and patient-monitoring instruments use the ADS8401IBPFBT for mid-tier channel digitizing, taking advantage of 16-bit dynamic range and parallel bus for fast pixel read-out. The −40 to +85°C industrial temperature grade supports hospital-cart and bedside applications. Its SAR architecture ensures the per-sample accuracy required when reconstructing medical waveforms, fitting analog front-end boards in diagnostic imaging peripherals.
Được đề xuất
Automotive Sensor Acquisition
Automotive powertrain and chassis ECUs use the ADS8401IBPFBT to digitize position, pressure, and current-sensor outputs where the I-grade temperature range (−40 to +85°C) provides margin over consumer conditioning. With an external bipolar front-end it handles automotive sensors in non-safety-critical paths. For safety-critical paths, TI's AEC-Q100-qualified ADC families such as ADS8544 should be used instead of this industrial-grade part.
Được đề xuất
Precision Data-Acquisition PCBs
Bench-top and rack-mounted instrumentation cards use the ADS8401IBPFBT for digitizing transducer analog front-ends where 16-bit straight-binary output integrates easily with FPGA or MCU post-processing pipelines. Designers pair it with low-noise LDO regulators and external reference buffers for laboratory-grade accuracy. The parallel 8-bit or 16-bit interface accommodates both legacy 8-bit microcontrollers and modern FPGAs in the same PCB footprint.
Được đề xuất
Test & Measurement Instrumentation
Test equipment manufacturers apply the ADS8401IBPFBT in semi-modular instruments where 16-bit resolution and 1.25 MSPS capture transient inputs that flash ADCs under-sample. The parallel bus simplifies integration with discrete-logic or FPGA capture modules in oscilloscope plug-ins and data loggers. Its internal 4.096 V reference saves component cost without compromising DC accuracy at the test-bench level, and power consumption stays under 110 mW during continuous full-rate acquisition runs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8401IBPFBT — 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 | ADS8401IBPFBR | ADS8401IPFBT | ADS8411IBPFBR | ADS8405IPFBTG4 | ADS8401IBPFBTG4 |
|---|---|---|---|---|---|---|
| Package | 48-TQFP (PFB), 7x7 mm | 48-TQFP (PFB), 7x7 mm - same | 48-TQFP (PFB), 7x7 mm - same | 48-TQFP (PFB), 7x7 mm - same | 48-TQFP (PFB), 7x7 mm - same | 48-TQFP (PFB), 7x7 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Sample Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 2 MSPS (+60%) | 1.25 MSPS | 1.25 MSPS |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Architecture | SAR (Successive Approx) | SAR | SAR | SAR | SAR | SAR |
| Internal Reference | 4.096 V, on-chip | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Digital Interface | Parallel 16/8-bit | Parallel 16/8-bit | Parallel 16/8-bit | Parallel 16/8-bit | Parallel 16/8-bit | Parallel 16/8-bit |
| Operating Temperature | −40 to +85 °C (Industrial) | −40 to +85 °C | −40 to +85 °C | −40 to +85 °C | −40 to +85 °C | −40 to +85 °C |
| Reel Quantity | 250 (small reel) | 1,000 (full reel) | 250 (small reel) | 1,000 (full reel) | 250 (Pb-free) | 250 (Pb-free) |
Bảo phân biệt quan trọng
- Higher sample rate vs older generation (vsADS8401IBPFBR)
- Smaller reel for low-volume prototyping (vsADS8401IBPFBR)
- Easy speed upgrade path (vsADS8401IPFBT)
- Pb-free RoHS finish variant available (vsADS8401IPFBT)
Ghi chú thiết kế
Estimated: at +5V AVDD and 1.25 MSPS full-rate operation, the ADS8401IBPFBT consumes approximately 110 mW internally (22 mA). Use a 0.1 µF ceramic bypass as close as possible to each AVDD pin (1, 2, 18, 23, 24) and a 10 µF low-ESR tantalum or ceramic bulk capacitor within 0.1 inch of the package. A separate analog ground island tied to DGND at a single point under pin 31 prevents digital switching noise from coupling into the analog reference.
Do not route the BYTE mode-pin or CS/PCB digital lines parallel to the analog input near pin 3; crosstalk can appear as 1-2 LSB of repeating noise. The 16-bit-parallel-bus lines (D[15:0] on pins 39-46, 4-7) should be equal-length and series-terminated when driving traces longer than 25 mm. Always issue a dummy read (twice the conversion time, typically 1.6 µs) after power-up before reading valid data to discharge the internal reference capacitor ladder.
Place the 47 µF reference bypass capacitors REFM-to-REFOUT as close to the package as possible (within 5 mm), using the dedicated CAP1/CAP2/CAP3 pins (10, 11, 12, 13). The exposed thermal pad (pin 48) MUST be soldered to a 1 cm² copper pour on the PCB top layer for thermal relief; without this attachment, junction temperatures rise roughly 15-20 °C/W higher during continuous full-rate operation.
When driving the analog input (pin 3) with a source impedance greater than 100 Ω, add a wideband op-amp buffer (e.g., OPA2277) within 2-3 inches of the pin to preserve THD performance above −85 dB. For multi-channel systems scanning this ADC through an external MUX, allow at least 1 µs of acquisition time before initiating conversion and add a 50 Ω series-termination resistor at the MUX output for settling improvement.
Thông tin tuân thủ
Pb-free matte-tin lead finish. Not AEC-Q100 qualified - choose the TI ADS8544 family for automotive applications requiring AEC-Q100 qualification.