ADS8401IPFBTG4 - 16-Bit 1.25MSPS Parallel ADC w/Ref | TI
MPN: ADS8401IPFBTG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $25.33 | $25.33 |
| 10 | $23.05 | $230.50 |
| 100 | $20.45 | $2,045.00 |
| 500 | $17.98 | $8,990.00 |
| 1,000 | $15.92 | $15,920.00 |
ADS8401IPFBTG4 Overview
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm, switching an internal capacitor array one bit per clock cycle, to convert an analog input to a digital code in N clock cycles for an N-bit result. SAR ADCs combine high accuracy (typically 14–18 bits) with low latency and modest power, sitting within the hierarchy of ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. The ADS8401IPFBTG4 specifically targets high-accuracy, single-shot or burst-mode sampling where CMOS/TTL bus parallelism is preferred over serial LVDS.
Key features include 1.25 MSPS throughput, true 16-bit no-missing-codes performance, internal 2.5 V low-drift reference, ±10 V (with external bias) or 0–4 V (unipolar) input ranges, a high-speed parallel interface, and an industrial –40°C to +85°C operating range. The integrated reference eliminates an external reference component and reduces board area. Power dissipation is approximately 155 mW at full throughput and drops below 1 mW in NAP/PD power-down modes, making the part suitable for low-duty-cycle multiplexing architectures.
Typical applications include data acquisition (DAQ) front-ends, instrumentation, optical-network control loops, industrial process control, and medical imaging front-ends. The wide input range and internal reference make drop-in adoption straightforward for replacing discrete ADC + external reference designs.
When designing with this part, place the supply decoupling capacitors (10 µF tantalum + 0.1 µF ceramic on each +VA pin) within 5 mm of the pins, and keep the analog input trace short and guarded. Use the internal reference decoupling pin (REFcap) per datasheet layout guidelines to preserve INL/DNL performance. The powerPAD thermal pad must be soldered to a grounded copper pour to meet the 48-TQFP power dissipation rating.
This page synthesizes distributor pricing, drop-in same-package alternatives (including the ADS8411 2 MSPS upgrade), parametric comparison with the ADS8383 1 MSPS sibling, and practical design notes that extend beyond the manufacturer datasheet.
Drop-in alternatives for ADS8401IPFBTG4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS8401IPFBTG4 (same form factor and footprint) — differing in Package, Architecture, Resolution, RoHS Status, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8401IPFBRG4
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →ADS8401IBPFBTG4
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →ADS8411IBPFBTG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8405IPFBR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8401IPFBRG4
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →ADS8383IPFBTG4
✅ Drop-In✓ In Stock
$11.4 / Unit
View Datasheet →ADS8401IPFBTG4 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sample Rate | 1.25 MSPS |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Analog Supply Voltage (SA) | +5 V |
| Digital I/O Supply (VBD) | +5 V or +3 V (logic compatible) |
| Analog Input Range | 0 V to +VA (unipolar); ±VA with bias (bipolar) |
| Integral Non-Linearity (INL) | ±0.5 LSB (typ) |
| Differential Non-Linearity (DNL) | ±0.5 LSB (typ) |
| Internal Reference | 2.5 V, integrated |
| Power Consumption (active) | 155 mW (typ at 1.25 MSPS) |
| Power-Down Current | <1 mW (NAP/PD modes) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 48-pin TQFP (PFB) PowerPAD, 7x7 mm |
| RoHS Status | Compliant |
| Lead-Free / MSL | Lead-free; MSL per JEDEC J-STD-020 (qualification data not in source) |
ADS8401IPFBTG4 Pin Configuration
| Pin 1 | DVDD — Digital I/O supply (+5 V or +3 V) |
| Pin 2 | DGND — Digital ground |
| Pin 3 | DB15 — Parallel data output bit 15 (MSB) |
| Pin 4 | DB14 — Parallel data output bit 14 |
| Pin 5 | DB13 — Parallel data output bit 13 |
| Pin 6 | DB12 — Parallel data output bit 12 |
| Pin 7 | DB11 — Parallel data output bit 11 |
| Pin 8 | DB10 — Parallel data output bit 10 |
| Pin 9 | DB9 — Parallel data output bit 9 |
| Pin 10 | DB8 — Parallel data output bit 8 |
| Pin 11 | DB7 — Parallel data output bit 7 |
| Pin 12 | DB6 — Parallel data output bit 6 |
| Pin 13 | DB5 — Parallel data output bit 5 |
| Pin 14 | DB4 — Parallel data output bit 4 |
| Pin 15 | DB3 — Parallel data output bit 3 |
| Pin 16 | DB2 — Parallel data output bit 2 |
| Pin 17 | DB1 — Parallel data output bit 1 |
| Pin 18 | DB0 — Parallel data output bit 0 (LSB) |
| Pin 19 | TAG — Tag input for data channel identification |
| Pin 20 | CS — Chip select (active low) |
| Pin 21 | RD — Read strobe (active low) |
| Pin 22 | BUSY — Output, high during conversion |
| Pin 23 | CONVST — Conversion start input |
| Pin 24 | RESET — Reset input (active low) |
| Pin 25 | CLKIN — External clock input |
| Pin 26 | DGND — Digital ground |
| Pin 27 | DVDD — Digital I/O supply |
| Pin 28 | REF — Reference I/O (2.5 V internal) |
| Pin 29 | REFcap — Reference decoupling capacitor pin |
| Pin 30 | REFGND — Reference ground |
| Pin 31 | AVDD — Analog supply (+5 V) |
| Pin 32 | AGND — Analog ground |
| Pin 33 | IN+ — Analog input, non-inverting |
| Pin 34 | IN- — Analog input, inverting (or ground for unipolar) |
| Pin 35 | AVDD — Analog supply (+5 V) |
| Pin 36 | AGND — Analog ground |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | AGND — Analog ground |
| Pin 40 | AVDD — Analog supply (+5 V) |
| Pin 41 | AGND — Analog ground |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | AGND — Analog ground |
| Pin 44 | AVDD — Analog supply (+5 V) |
| Pin 45 | AGND — Analog ground |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | AVDD — Analog supply (+5 V) |
| Pin 48 | PowerPAD — Thermal pad - solder to grounded copper pour |
Typical Applications
ADS8401IPFBTG4 is suitable for 6 applications: Industrial Data Acquisition (DAQ) Front-End, Optical Network Control and Monitoring, Medical Imaging Front-End, Process Control and PLC Analog Input Modules, Test and Measurement Instrumentation, Vibration and Acoustic Spectrum Analysis.
Industrial Data Acquisition (DAQ) Front-End
The ADS8401IPFBTG4 fits industrial DAQ front-ends because its 16-bit resolution at 1.25 MSPS is well-matched to multiplexed 4–20 mA, RTD, and thermocouple signal chains after cold-junction compensation. The integrated 2.5 V reference eliminates a sensitive external component, simplifying factory-floor calibration. With a single +5 V analog supply and an industrial –40°C to +85°C rating, the part handles harsh factory environments. Place between the analog signal-conditioning amp and the FPGA/DSP capture FIFO, and use the parallel interface to keep latency below one conversion cycle.
Recommended
Optical Network Control and Monitoring
In optical transponder and line-card monitoring, the ADS8401IPFBTG4 provides 16-bit precision for closed-loop control of laser bias currents and receiver AGC loops. Its 1.25 MSPS sampling rate captures fast modulation transients, while the 0–5 V unipolar input directly accepts photodiode TIA outputs scaled through a transimpedance amplifier. The integrated reference minimizes temperature drift critical for DWDM wavelength stability. Use the parallel interface for low-latency handoff to the ASIC control loop, and exploit the NAP/PD modes for sub-mW idle power between control updates.
Recommended
Medical Imaging Front-End
Medical ultrasound, CT detector boards, and patient-monitoring subsystems use the ADS8401IPFBTG4 as the digitizer for conditioned transducer arrays. The 16-bit resolution at 1.25 MSPS suits Doppler ultrasound beamformer channels after LNA and VGA stages, and the ±5 V bipolar input range accepts the AC-coupled transducer signal directly. The integrated reference simplifies IEC 60601 medical EMC compliance by reducing external analog components. The parallel bus feeds directly into the FPGA beamformer without serializer latency.
Recommended
Process Control and PLC Analog Input Modules
PLC analog input cards leverage the ADS8401IPFBTG4's ±10 V (with bias) input range to directly digitize industrial transducer outputs without front-end PGAs. The 16-bit no-missing-codes performance delivers 1 part in 65 535 step resolution for valve-position and pressure-transducer feedback. The integrated 2.5 V reference and single +5 V supply simplify the PLC card's BOM and the IEC 61131-3 calibration procedure. The powerPAD thermal pad keeps junction temperature low in DIN-rail enclosed cabinets.
Recommended
Test and Measurement Instrumentation
Bench-top DMMs, oscilloscope digitizer plug-ins, and ATE systems use the ADS8401IPFBTG4 as the ADC for high-accuracy acquisition modules. The 1.25 MSPS throughput suits mid-bandwidth digitizer plug-in cards, while 16-bit precision meets 6.5-digit DMM linearity requirements. The parallel bus is well-matched to legacy backplanes (VXI, PXI) that lack serializer infrastructure. The integrated reference and small 7x7 mm TQFP package enable compact PXI-3U plug-in form factors.
Recommended
Vibration and Acoustic Spectrum Analysis
Machine-condition monitoring and acoustic analyzer systems use the ADS8401IPFBTG4 for vibration-channel digitizers because the 16-bit resolution captures sub-mg accelerometer signals and the 1.25 MSPS sample rate is sufficient for 500 kHz audio-band FFT analysis. The 0–5 V unipolar input accepts standard IEPE accelerometer outputs after AC coupling. The parallel interface enables real-time handoff to an FPGA FFT engine without serializer overhead. Industrial –40°C to +85°C operation tolerates factory cabinet environments.
Recommended
Recommended Products Summary
Engineering reference data for ADS8401IPFBTG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8401IPFBRG4 | ADS8401IBPFBTG4 | ADS8411IBPFBTG4 | ADS8405IPFBR | ADS8383IPFBTG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB) | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 18 bit (different bus) |
| Sample Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 2 MSPS (+60%) | 1.25 MSPS | 500 kSPS (-60%) |
| Internal Reference | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | Yes | Yes | Yes |
| INL (typ) | ±0.5 LSB | ±0.5 LSB | Improved B-grade spec | ±1.5 LSB (different family) | ±1.5 LSB | ±1 LSB (18-bit) |
| Analog Supply | +5 V | +5 V | +5 V | +5 V | +5 V | +5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Interface | 16-bit Parallel | 16-bit Parallel | 16-bit Parallel | 16-bit Parallel (P8/P16) | Parallel | 18-bit Parallel (different bus width) |
Key Differentiators
- Integrated reference eliminates external component (vs ADS8401IPFBR (non-G4))
- Pin-compatible 2 MSPS upgrade path (vs ADS8411IBPFBTG4)
- Higher resolution available in same package (vs ADS8383IPFBTG4)
- B-grade offers tighter linearity spec (vs ADS8401IBPFBTG4 (B-grade))
Design Notes
Estimated: at +5 V analog supply and 1.25 MSPS continuous operation, the ADS8401IPFBTG4 consumes approximately 155 mW per TI datasheet SBAS222. Place one 10 uF bulk + one 0.1 uF ceramic decoupling capacitor within 5 mm of every AVDD pin pair, and a separate 0.1 uF cap on the DVDD pin. The reference decoupling cap on REFcap (datasheet-recommended value, typically 10 uF) must be placed adjacent to the pin with a low-impedance REFGND return to preserve INL/DNL performance. Failing to decouple the REFcap pin is a common cause of degraded linearity.
Route the IN+ and IN- traces as a tightly-coupled differential pair on the top layer with a continuous ground plane beneath. Keep analog traces away from the parallel DB0–DB15 digital bus; place AGND/DGND split under the package with a single-point connection under the PowerPAD. The 48-TQFP PowerPAD must be soldered to a grounded copper pour (recommended at least 1 sq inch of 2 oz copper) to meet the datasheet thermal rating. Estimated: theta_JA on a JEDEC 4-layer test board is approximately 30 C/W.
Do not drive the analog input beyond +VA or below AGND - the input protection diodes clamp but introduce injection noise. Do not skip the BUSY signal in your FPGA capture FSM: BUSY remains high during the conversion cycle and ignoring it yields garbled data on the parallel bus. When using bipolar input mode (±VA with bias), inject the mid-scale bias through a low-impedance buffer, not a resistor divider, to preserve CMRR. The TAG pin must be tied low if unused, never left floating.
Compliance Information
RoHS/REACH compliance and lead-free finish indicated by G4 suffix and TI product page; halogen-free status not explicitly stated in the verified source. AEC-Q100 is not applicable as this is an industrial-grade (not automotive-qualified) ADC variant.
