ADS8402IPFBR - 16-Bit 1.25MSPS Pseudo-Bipolar Parallel ADC | Texas Instruments
MPN: ADS8402IPFBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.42 | $164.20 |
| 100 | $13.87 | $1,387.00 |
| 500 | $12.05 | $6,025.00 |
| 1,000 | $10.43 | $10,430.00 |
ADS8402IPFBR Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary search algorithm through an internal capacitive DAC to digitize an analog input in N clock cycles for N-bit resolution. SAR ADCs combine low latency, deterministic behavior, and excellent DC accuracy, and are widely used in industrial control loops, precision instrumentation, and data-acquisition systems where the ADC sits one level below precision amplifiers, isolation, and analog front-ends, and one level above microcontrollers, FPGAs, or DSPs that process the digital samples.
Key features of the ADS8402IPFBR include a wide ±10V (true bipolar) input range variant option, single +5V analog supply operation, internal 4.495V reference with optional external reference override, hardware/software configurable analog input range (0V–REF, 0V–2xREF, ±REF, ±2xREF), and a parallel 16-bit/8-bit bus interface. Power dissipation is typically 155 mW at 1.25 MSPS, with scalable power-down modes for low-duty-cycle acquisition. The 48-pin TQFP package supports industrial -40°C to +85°C operation and is pin-compatible with the wider ADS840x/ADS841x/ADS838x family.
Typical applications include industrial process control, multi-channel data-acquisition systems (DAQ), precision instrumentation, optical networking gain control loops, and medical imaging front-ends. The integrated reference and parallel interface simplify board design and reduce BOM cost compared to discrete ADC plus external reference solutions.
When designing with the ADS8402IPFBR, ensure the analog input common-mode voltage remains within the specified input range for the selected configuration, and decouple AVDD and DVDD with separate 1 µF ceramic and 10 µF bulk capacitors placed close to the pins. The device requires a clean, low-impedance reference decoupling scheme to achieve full 16-bit performance.
This page synthesizes distributor pricing as of 2026-10-13, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a one-stop reference for sourcing and designing with this part.
Drop-in alternatives for ADS8402IPFBR — 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 ADS8402IPFBR (same form factor and footprint) — differing in Input Type, Resolution, Package, Analog Supply Voltage, Digital Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8402IBPFBR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8402IPFBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8406IBPFBR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8412IBPFBTG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8401IBPFBR
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →ADS8383IPFBRG4
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →ADS8402IPFBR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 1.25 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 |
| Input Type | Pseudo-Bipolar Differential, Unipolar |
| Input Voltage Range | 0 V to +REF or +REF/2 (configurable, ±REF, ±2xREF with bipolar part) |
| Reference Type | Internal 4.495 V, External Override Supported |
| Data Interface | Parallel 16-bit / 8-bit (byte mode) |
| Analog Supply Voltage | 4.75 V to 5.25 V (typical +5 V) |
| Digital Supply Voltage | 3 V to 5.25 V |
| Power Dissipation | 155 mW at 1.25 MSPS |
| SNR | 86 dB at 100 kHz input |
| THD | -84 dB at 100 kHz input |
| Operating Temperature | -40 C to +85 C |
| Package | 48-pin TQFP (PFB) |
| Mounting Type | Surface Mount |
| MSL Level | 2 (1 year floor life) |
| RoHS Status | Compliant |
ADS8402IPFBR Pin Configuration
| Pin 1 | DGND — Digital ground |
| Pin 2 | DVDD — Digital supply voltage |
| Pin 3 | RESET — Hardware reset input, active low |
| Pin 4 | CS — Chip select, active low |
| Pin 5 | RD — Read input, active low |
| Pin 6 | BUSY — Conversion in progress, active high |
| Pin 7 | CONVST — Conversion start input |
| Pin 8 | BYTE — Byte mode select (high = 8-bit bus) |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — Reference voltage I/O (internal/external) |
| Pin 11 | REFGND — Reference ground |
| Pin 12 | REFOUT — Internal reference output |
| Pin 13 | REFIN — External reference input |
| Pin 14 | AVDD — Analog supply voltage |
| Pin 15 | IN+ — Positive analog input |
| Pin 16 | IN- — Negative analog input |
| Pin 17 | AGND — Analog ground |
| Pin 18 | RANGE — Input range select |
| Pin 19 | NC — Not connected |
| Pin 20 | NC — Not connected |
| Pin 21 | NC — Not connected |
| Pin 22 | D0 — Data bit 0 (LSB) |
| Pin 23 | D1 — Data bit 1 |
| Pin 24 | D2 — Data bit 2 |
| Pin 25 | D3 — Data bit 3 |
| Pin 26 | D4 — Data bit 4 |
| Pin 27 | D5 — Data bit 5 |
| Pin 28 | D6 — Data bit 6 |
| Pin 29 | D7 — Data bit 7 |
| Pin 30 | DGND — Digital ground |
| Pin 31 | D8 — Data bit 8 |
| Pin 32 | D9 — Data bit 9 |
| Pin 33 | D10 — Data bit 10 |
| Pin 34 | D11 — Data bit 11 |
| Pin 35 | D12 — Data bit 12 |
| Pin 36 | D13 — Data bit 13 |
| Pin 37 | D14 — Data bit 14 |
| Pin 38 | D15 — Data bit 15 (MSB) |
| Pin 39 | DGND — Digital ground |
| Pin 40 | TAG — Tag input for data tagging |
| Pin 41 | PD — Power-down input |
| Pin 42 | CLK — External clock input |
| Pin 43 | AVDD — Analog supply voltage |
| Pin 44 | AGND — Analog ground |
| Pin 45 | NC — Not connected |
| Pin 46 | NC — Not connected |
| Pin 47 | NC — Not connected |
| Pin 48 | AGND — Analog ground |
Typical Applications
ADS8402IPFBR is suitable for 6 applications: Industrial Process Control, Multi-Channel Data Acquisition Systems, Precision Instrumentation and Test Equipment, Optical Networking Gain Control Loops, Medical Imaging Front-End Signal Digitization, Vibration Analysis and Condition Monitoring.
Industrial Process Control
The ADS8402IPFBR's 16-bit resolution and 1.25 MSPS sample rate make it well-suited to industrial process-control loops where multi-channel pressure, flow, and temperature sensors require simultaneous 16-bit acquisition at sustained throughput above 1 MSPS. The integrated 4.495 V reference eliminates an external reference IC, reducing BOM cost and PCB area, while the parallel interface delivers 16-bit data with deterministic latency to an FPGA or DSP, simplifying the closed-loop control timing. With 86 dB SNR at 100 kHz input, the part preserves measurement integrity even in noisy factory environments, where motor drives inject substantial EMI onto analog traces.
Recommended
Multi-Channel Data Acquisition Systems
The ADS8402IPFBR is widely deployed in modular multi-channel data-acquisition (DAQ) cards where 16 simultaneous channels each require 1 MSPS-class throughput. The pseudo-bipolar input configuration with configurable 0 V to VREF or 0 V to 2xVREF range accommodates a wide variety of sensor output levels. The parallel interface provides 16-bit data in a single bus cycle, minimizing FPGA pin count. The 155 mW power dissipation at full speed is manageable in fan-cooled chassis; at lower throughput the device's power-down mode reduces consumption below 1 mW, extending battery life in portable DAQ instruments.
Recommended
Precision Instrumentation and Test Equipment
The ADS8402IPFBR delivers 86 dB SNR and -84 dB THD at 100 kHz analog input, suiting precision instrumentation such as bench-top multimeters, spectrum analyzers, and bench-top oscilloscopes that require both wide dynamic range and clean harmonic distortion. The integrated 4.495 V reference with optional external override enables the calibration accuracy required by laboratory-grade instrumentation. The parallel 16-bit bus allows an FPGA to capture and process samples in real time, supporting FFT-based analysis at the full 1.25 MSPS throughput.
Recommended
Optical Networking Gain Control Loops
In optical networking line cards and transponder modules, the ADS8402IPFBR digitizes the photodiode monitor signal for automatic gain control (AGC) loops. The 1.25 MSPS sample rate captures the photodiode response with sub-microsecond resolution, enabling tight feedback control of the transimpedance amplifier gain stage. The pseudo-bipolar input accepts both positive and negative photodiode voltages, simplifying analog front-end design. The 16-bit dynamic range supports monitoring from very weak (-30 dBm) to saturated (+3 dBm) optical power, while the integrated reference ensures long-term gain stability across temperature.
Recommended
Medical Imaging Front-End Signal Digitization
The ADS8402IPFBR supports medical imaging systems such as ultrasound receivers and patient-monitoring front-ends that demand 16-bit resolution at MSPS-class sampling. The 16-bit dynamic range and 86 dB SNR preserve image contrast across the full grayscale of the imaging chain, while the SAR architecture's deterministic latency simplifies the beam-forming pipeline in ultrasound. The pseudo-bipolar input handles the AC-coupled signals from transducer preamps directly, with the integrated reference reducing calibration drift across the medical device's service life. The TQFP-48 footprint fits the form factor of portable ultrasound carts.
Recommended
Vibration Analysis and Condition Monitoring
The ADS8402IPFBR's 86 dB SNR and -84 dB THD at 100 kHz input make it a strong candidate for vibration analysis and predictive-maintenance (condition monitoring) modules. The 1.25 MSPS sample rate captures the full spectrum of rotating-machine vibration up to 500 kHz, sufficient to resolve bearing-fault frequencies and gear-mesh harmonics. The SAR architecture's inherent anti-aliasing characteristics and the integrated reference simplify the analog front end. The parallel interface feeds an FPGA performing real-time FFT for envelope analysis and bearing-fault detection, enabling predictive-maintenance alerts before catastrophic failure.
Recommended
Recommended Products Summary
Engineering reference data for ADS8402IPFBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8402IBPFBR | ADS8402IPFBT | ADS8406IBPFBR | ADS8412IBPFBTG4 | ADS8401IBPFBR | ADS8383IPFBR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | 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 | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 18 bit |
| Sample Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 1 MSPS | 2 MSPS | 1 MSPS | 500 kSPS |
| Internal Reference | 4.495 V | 4.495 V | 4.495 V | 4.495 V | 4.096 V | 4.495 V | 3 V |
| Power Dissipation | 155 mW at 1.25 MSPS | 155 mW at 1.25 MSPS | 155 mW at 1.25 MSPS | 100 mW at 1 MSPS | 190 mW at 2 MSPS | 130 mW at 1 MSPS | 115 mW at 500 kSPS |
| Data 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 | Serial LVDS |
| Input Type | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Single-Ended |
Key Differentiators
- Integrated low-drift 4.495 V reference eliminates external reference IC (vs ADS8412IBPFBTG4)
- Higher 1.25 MSPS sample rate than ADS8406 family (vs ADS8406IBPFBR)
- Pseudo-bipolar differential input range flexibility (vs ADS8383IPFBR)
- Parallel interface preserves deterministic latency (vs ADS8383IPFBR)
Design Notes
Decouple AVDD (analog +5 V) and DVDD (digital 3 V to 5 V) separately with a 1 µF X7R ceramic capacitor and a 10 µF tantalum bulk capacitor placed within 5 mm of each supply pin. Star-ground AGND and DGND at a single point near the ADC. Do not route digital return currents through the analog ground plane; use a separate DGND island or guard ring. Estimated: with 155 mW dissipation at full 1.25 MSPS throughput, a 4-layer FR-4 PCB with adequate copper pour keeps the junction below 70 °C in 25 °C ambient.
Route the parallel data bus D[15:0] with matched-length traces (±50 mils) and 22 Ω series-termination resistors at the ADC outputs to suppress reflections. Place the ADC close to the FPGA/CPLD that consumes the parallel data to minimize bus length below 50 mm. The REFOUT pin must be decoupled with 1 µF X7R + 10 µF tantalum to AGND within 5 mm of the pin to achieve the datasheet SNR/THD performance. Do not run digital bus traces beneath the analog input traces or the reference traces.
Place a guard ring tied to AGND around the IN+ and IN- analog input traces to minimize digital noise coupling into the sensitive analog front-end. Use differential routing for IN+ and IN- with constant 50 Ω differential characteristic impedance, keeping trace lengths matched to within 1 mm. The REF and REFOUT traces must be guarded from digital bus transitions by either an AGND moat or physical separation. Add a via-stitched AGND fence around the analog section of the PCB.
The CONVST input should be driven by a low-jitter clock source; jitter above 20 ps RMS degrades the SNR by approximately 1 dB for every doubling of analog input frequency. Add a 100 Ω series resistor at the CLK pin to dampen clock ringing, and place a 10 pF capacitor to AGND within 5 mm if ringing persists. The BUSY output transitions high during conversion; route it away from sensitive analog traces and add a 1 kΩ pull-down at the receiving FPGA input.
Do not exceed AVDD = 5.25 V absolute maximum, as this permanently damages the internal reference. When using external reference mode, source the REFIN pin from a low-noise buffer amplifier; do not directly drive REFIN from a high-impedance resistive divider. When the input range is changed via the RANGE pin, allow at least 1 ms settling time before initiating a conversion. Pull PD low at least 100 ns before reasserting CS to enter power-down mode cleanly.
Compliance Information
RoHS compliant per TI product page. Lead-free (Pb-free) reflow-compatible. Not AEC-Q100 qualified - for automotive applications consult TI's automotive-grade ADC portfolio. Halogen-free status not explicitly listed in available datasheet materials.