ADS8401IBPFBT - 16-Bit 1.25MSPS SAR ADC w/ Internal Ref | TI
MPN: ADS8401IBPFBT ✓ פעילADS8401IBPFBT סקירה
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.
חלופות תחליף ישיר עבור ADS8401IBPFBT — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS8401IBPFBT (אותו גורם צורה וטביעת רגל) — שונים ב Package, Input Type, Analog Supply Voltage, Architecture, Data Interface.
ADS8401IBPFBR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8401IPFBT
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS8411IBPFBR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS8405IPFBTG4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS8401IBPFBTG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8401IBPFBT דירוגים מרביים ומאפיינים חשמליים
| Manufacturer | Texas Instruments |
| Series | ADS8401 |
| רזולוציה | 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 |
| טווח מתח כניסה | 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 |
| טמפרטורת פעולה | −40°C to +85°C (Industrial grade) |
| מארז | 48-pin TQFP (PFB), 7x7 mm |
| סוג הרכבה | Surface Mount |
| רמת MSL | 2 (1 year floor life) |
| סטטוס RoHS | Compliant |
| Lead Finish | Matte Tin (Pb-free) |
| פונקציה | Analog-to-Digital Converter |
| Family | Data Acquisition - ADCs |
תצורת פינים של ADS8401IBPFBT
| פין 1 | AVDD — Analog +5V supply (bypass with 10uF+0.1uF) |
| פין 2 | AVDD — Analog +5V supply |
| פין 3 | AIN — Analog input (single-ended) |
| פין 4 | D0 — Data bit 0 (LSB) - shared with D[7:0] in 8-bit mode |
| פין 5 | D1 — Data bit 1 |
| פין 6 | D2 — Data bit 2 |
| פין 7 | D3 — Data bit 3 |
| פין 8 | AGND — Analog ground |
| פין 9 | REFM — Reference ground return |
| פין 10 | REFIN/REFOUT — Reference input/output (4.096V) |
| פין 11 | CAP1 — Reference bypass capacitor 1 |
| פין 12 | CAP2 — Reference bypass capacitor 2 |
| פין 13 | CAP3 — Reference bypass capacitor 3 |
| פין 14 | AGND — Analog ground |
| פין 15 | AIN1 — Differential mode input 1 |
| פין 16 | AIN2 — Differential mode input 2 |
| פין 17 | AGND — Analog ground |
| פין 18 | AVDD — Analog +5V supply |
| פין 19 | CS — Chip select (active low) |
| פין 20 | RD — Read strobe (active low) |
| פין 21 | BUSY — Output flag - high during conversion |
| פין 22 | AGND — Analog ground |
| פין 23 | AVDD — Analog +5V supply |
| פין 24 | AVDD — Analog +5V supply |
| פין 25 | RANGE — Input range select |
| פין 26 | GAIN — PGA gain select |
| פין 27 | RESET — Reset (active low) |
| פין 28 | AGND — Analog ground |
| פין 29 | NC — Not connected (per datasheet) |
| פין 30 | DVDD — Digital +5V supply |
| פין 31 | DGND — Digital ground (single-point star with AGND) |
| פין 32 | BYTE — Byte/parallel mode select (high=8-bit, low=16-bit) |
| פין 33 | NC — Not connected |
| פין 34 | NC — Not connected |
| פין 35 | NC — Not connected |
| פין 36 | NC — Not connected |
| פין 37 | NC — Not connected |
| פין 38 | DVDD — Digital +5V supply |
| פין 39 | D15 — Data bit 15 (MSB) |
| פין 40 | D14 — Data bit 14 |
| פין 41 | D13 — Data bit 13 |
| פין 42 | D12 — Data bit 12 |
| פין 43 | D11 — Data bit 11 |
| פין 44 | D10 — Data bit 10 |
| פין 45 | D9 — Data bit 9 |
| פין 46 | D8 — Data bit 8 |
| פין 47 | AGND — Analog ground |
| פין 48 | PAD — Exposed thermal pad - tie to analog ground plane |
יישומים טיפוסיים
ADS8401IBPFBT מתאים עבור 7 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS8401IBPFBT — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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) |
מבדילים עיקריים
- Higher sample rate vs older generation (לעומתADS8401IBPFBR)
- Smaller reel for low-volume prototyping (לעומתADS8401IBPFBR)
- Easy speed upgrade path (לעומתADS8401IPFBT)
- Pb-free RoHS finish variant available (לעומתADS8401IPFBT)
הערות תכנון
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.
מידע על תאימות
Pb-free matte-tin lead finish. Not AEC-Q100 qualified - choose the TI ADS8544 family for automotive applications requiring AEC-Q100 qualification.