ADS8402IPFBTG4 - 16-Bit 1.25MSPS Parallel ADC | Texas Instruments
MPN: ADS8402IPFBTG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.85 | $14.85 |
| 10 | $13.2 | $132.00 |
| 100 | $11.5 | $1,150.00 |
| 500 | $9.95 | $4,975.00 |
| 1,000 | $8.75 | $8,750.00 |
ADS8402IPFBTG4 Overview
An ADC (Analog-to-Digital Converter) is a data conversion integrated circuit that samples continuous analog signals and quantizes them into discrete digital codes. Successive-approximation register (SAR) ADCs like the ADS8402IPFBTG4 use a binary-search algorithm through an internal DAC to converge on the input voltage one bit per clock cycle, providing deterministic latency and excellent noise performance at mid-to-high sampling rates. SAR ADCs sit within the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor, and serve as the bridge between analog sensors/signals and digital processors (DSPs, FPGAs, microcontrollers).
Key features of the ADS8402IPFBTG4 include 1.25 MSPS maximum sampling rate, 16-bit resolution with no missing codes, pseudo-bipolar differential input range, on-chip 4.096 V reference, low power consumption optimized for micro-power designs, and a standard parallel (byte-selectable) digital interface compatible with common microcontrollers and DSPs. Industrial temperature operation from -40C to +85C ensures reliability in factory and outdoor environments.
Architecturally, the device uses a charge-redistribution SAR core, a high-bandwidth differential track-and-hold, and an internal low-drift reference. The pseudo-bipolar differential input accepts signals centered around the common-mode voltage, simplifying interface with bridge sensors, instrumentation amplifiers, and single-ended signals after DC biasing.
Typical applications include industrial process control, multi-channel data acquisition systems, optical encoder feedback, vibration analysis, precision weigh scales, and motor control position feedback. The parallel interface simplifies connection to legacy microcontrollers and DSPs that lack high-speed serial peripherals.
When designing with this device, pay attention to analog and digital supply decoupling and layout: route AVDD and DVDD separately with star-ground topology, place 10 uF bulk + 0.1 uF ceramic bypass capacitors close to each supply pin, and isolate the analog and digital ground planes with a single-point connection beneath the ADC. Failure to isolate grounds will couple digital switching noise into the analog front end and degrade SNR.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not found in the manufacturer datasheet alone, helping engineers select, source, and implement the ADS8402IPFBTG4 with confidence.
Drop-in alternatives for ADS8402IPFBTG4 — 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 ADS8402IPFBTG4 (same form factor and footprint) — differing in Input Type, Package, Analog Supply Voltage, Data Interface, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8402IPFBR
✅ Drop-In✓ In Stock
$10.43 / Unit
View Datasheet →ADS8401IPFBRG4
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$11.75 / Unit
View Datasheet →ADS8383IPFBTG4
✅ Drop-In✓ In Stock
$11.4 / Unit
View Datasheet →ADS8382IRHPR
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →ADS8482IBRGZR
✅ Drop-In✓ In Stock
$14.45 / Unit
View Datasheet →ADS8481IRGZR
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$8.1 / Unit
View Datasheet →ADS8402IPFBTG4 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate (Max) | 1.25 MSPS |
| ADC Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 |
| Input Type | Pseudo-Bipolar Fully Differential |
| Analog Supply Voltage | +5 V (AVDD) |
| Digital Supply Voltage | +5 V (DVDD) |
| Internal Reference Voltage | 4.096 V |
| Digital Interface | Parallel (16-bit / 8-bit bus selectable) |
| Operating Temperature Range | -40C to +85C |
| Package Type | 48-pin TQFP (PFB) |
| Package Code | TFQFP / TQFP-48 |
| Terminal Form | Gull Wing |
| Mounting Type | Surface Mount |
ADS8402IPFBTG4 Pin Configuration
| Pin 1 | AVDD — Analog supply (+5 V) |
| Pin 2 | IN+ — Positive analog input |
| Pin 3 | IN- — Negative analog input |
| Pin 4 | REF — Reference voltage input/output (4.096 V) |
| Pin 5 | AGND — Analog ground |
| Pin 6 | AVDD — Analog supply (+5 V) |
| Pin 7 | AVDD — Analog supply (+5 V) |
| Pin 8 | AVDD — Analog supply (+5 V) |
| Pin 9 | CONVST — Conversion start input |
| Pin 10 | CS — Chip select (active low) |
| Pin 11 | RD — Read input (active low) |
| Pin 12 | BUSY — Busy output (active high during conversion) |
| Pin 13 | DVDD — Digital supply (+5 V) |
| Pin 14 | DGND — Digital ground |
| Pin 15 | BYTE — Byte mode select |
| Pin 16 | HBEN — High byte enable |
| Pin 17 | DB15 — Data bit 15 (MSB) |
| Pin 18 | DB14 — Data bit 14 |
| Pin 19 | DB13 — Data bit 13 |
| Pin 20 | DB12 — Data bit 12 |
| Pin 21 | DB11 — Data bit 11 |
| Pin 22 | DB10 — Data bit 10 |
| Pin 23 | DB9 — Data bit 9 |
| Pin 24 | DB8 — Data bit 8 |
| Pin 25 | DGND — Digital ground |
| Pin 26 | DVDD — Digital supply (+5 V) |
| Pin 27 | DB7 — Data bit 7 |
| Pin 28 | DB6 — Data bit 6 |
| Pin 29 | DB5 — Data bit 5 |
| Pin 30 | DB4 — Data bit 4 |
| Pin 31 | DB3 — Data bit 3 |
| Pin 32 | DB2 — Data bit 2 |
| Pin 33 | DB1 — Data bit 1 |
| Pin 34 | DB0 — Data bit 0 (LSB) |
| Pin 35 | DGND — Digital ground |
| Pin 36 | DVDD — Digital supply (+5 V) |
| Pin 37 | DGND — Digital ground |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | AGND — Analog ground |
| Pin 45 | AGND — Analog ground |
| Pin 46 | AGND — Analog ground |
| Pin 47 | REF — Reference voltage bypass |
| Pin 48 | AVDD — Analog supply (+5 V) |
Typical Applications
ADS8402IPFBTG4 is suitable for 6 applications: Industrial Process Control, Multi-Channel Data Acquisition Systems, Optical Encoder Position Feedback, Precision Weigh Scales, Vibration Analysis, Motor Control Position Feedback.
Industrial Process Control
The ADS8402IPFBTG4's 1.25 MSPS sampling rate and 16-bit resolution suit industrial process control loops where deterministic SAR latency avoids the pipeline-delay artifacts of higher-speed pipeline ADCs. With its pseudo-bipolar fully differential input, the device accepts 4-20 mA current-loop-derived signals biased around mid-supply, rejecting common-mode noise from long cable runs in factory environments. The integrated 4.096 V reference eliminates external drift-sensitive components, while the parallel interface connects directly to legacy PLCs and DSP-based controllers. Operates from -40C to +85C with industrial-grade reliability.
Recommended
Multi-Channel Data Acquisition Systems
In multi-channel data acquisition systems, the ADS8402IPFBTG4 pairs with external analog multiplexers and instrumentation amplifiers to digitize multiple sensor channels sequentially. The SAR architecture provides zero-latency conversions, critical for time-correlated multi-channel sampling, while the 1.25 MSPS rate enables aggregate throughput of hundreds of kSPS per channel after demux overhead. The parallel interface supports DMA-style data capture into FPGAs or microcontrollers with hardware handshaking via BUSY and RD pins. Differential input rejection of common-mode noise from sensor cables preserves 16-bit accuracy.
Recommended
Optical Encoder Position Feedback
Position feedback in optical encoder systems demands deterministic conversion latency, which the ADS8402IPFBTG4's SAR architecture provides without the variable group-delay of pipeline ADCs. The 1.25 MSPS sampling rate comfortably oversamples encoder quadrature signals after interpolation, supporting sub-arc-second resolution in precision motion control. The pseudo-bipolar differential input accepts sinusoidal encoder outputs biased around VREF/2, while the parallel bus enables direct connection to FPGA motion-control logic. Integrated reference simplifies the analog supply chain for compact encoder electronics.
Recommended
Precision Weigh Scales
Precision weigh scales use 24-bit sigma-delta ADCs for slow high-resolution readings, but the ADS8402IPFBTG4 serves fast in-motion weighing applications where throughput matters more than ultimate noise floor. The 1.25 MSPS rate captures transient forces on conveyor scales, while the 16-bit resolution provides sufficient dynamic range for ±0.1% weighing accuracy. The differential input accepts bridge sensor outputs with excellent common-mode rejection, and the integrated reference reduces BOM cost in price-sensitive commercial scale designs. Industrial temperature grade supports outdoor and food-processing environments.
Recommended
Vibration Analysis
Vibration analysis for predictive maintenance and structural health monitoring requires capturing wideband mechanical signals without aliasing, and the ADS8402IPFBTG4's 1.25 MSPS rate supports analysis of vibration frequencies up to ~600 kHz per Nyquist, with anti-aliasing filters in front. The SAR converter's deterministic latency ensures phase-coherent FFT analysis, while the 16-bit dynamic range captures subtle vibration signatures indicative of bearing wear or imbalance. Differential input rejects ground noise from industrial motor environments, and parallel bus streams sample data directly to DSPs for real-time spectral analysis.
Recommended
Motor Control Position Feedback
Motor control position and current feedback loops rely on deterministic ADC latency to avoid control-loop instability, and the ADS8402IPFBTG4's SAR converter delivers single-cycle conversion delay ideal for field-oriented control (FOC) of servo drives. The 1.25 MSPS rate supports current-loop bandwidths of 50-100 kHz after digital decimation, and the parallel interface integrates with TI C2000 microcontrollers and dedicated motor-control DSPs. The pseudo-bipolar differential input accepts current-sense amplifier outputs, while industrial temperature operation handles traction and industrial-drive thermal environments.
Recommended
Recommended Products Summary
Engineering reference data for ADS8402IPFBTG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8402IPFBR | ADS8401IPFBRG4 | ADS8383IPFBTG4 | ADS8382IRHPR | ADS8482IBRGZR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) |
| Resolution | 16 bits | 16 bits | 16 bits | 18 bits | 18 bits | 18 bits |
| Sampling Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 500 kSPS | 500 kSPS | 1 MSPS |
| Input Type | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | True Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential |
| Analog Supply | +5 V | +5 V | +5 V | +5 V | +5 V | +5 V |
| Digital Interface | Parallel (16/8-bit) | Parallel (16/8-bit) | Parallel (16/8-bit) | Parallel (18/16-bit) | Parallel (18/16-bit) | Parallel (18/16-bit) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Industry-standard 48-pin TQFP (PFB) footprint with extensive pin-compatible family (vs ADS8383IPFBTG4 (18-bit upgrade))
- Integrated 4.096 V reference eliminates external reference IC (vs ADS8482IBRGZR (18-bit upgrade))
- Deterministic SAR latency with zero pipeline delay (vs Pipeline ADCs at similar speed)
- Pseudo-bipolar differential input from single +5V supply (vs ADS8401IPFBRG4 (true bipolar))
Design Notes
Separate analog (AVDD) and digital (DVDD) supplies with independent decoupling: place a 10 uF tantalum plus 0.1 uF ceramic bypass capacitor within 5 mm of each AVDD/DVDD pin. Star-ground AVDD and DVDD returns to a single point beneath the ADC to prevent digital switching currents from corrupting the analog front-end. A common mistake is sharing the analog and digital ground plane without isolation, which couples 5V logic noise into the SAR comparator and degrades SNR.
Route the parallel data bus DB[15:0] with matched trace lengths (within ~25 mil of each other) to minimize skew, and keep the digital bus away from the analog IN+/IN- traces. Place a ground pour under the data bus and guard the analog input pair with ground traces on both sides to reduce capacitive coupling. Use a 4-layer PCB with dedicated analog and digital ground planes for best noise immunity in mixed-signal layouts.
Do not connect an external reference directly to the REF pin while the internal reference is enabled - this causes contention and can damage the reference cell. If using an external reference, the datasheet indicates the internal reference must be disabled via the appropriate configuration. Also avoid driving the analog input beyond AVDD + 0.3 V or below AGND - 0.3 V, as the input ESD diodes will conduct and inject non-linear charge into the sample capacitor, degrading linearity.
For optimal dynamic performance, drive the IN+ and IN- inputs with a low-impedance differential source (such as an instrumentation amplifier or differential driver op-amp) and AC-couple the common-mode voltage through a transformer if the source is single-ended. The SAR converter's 1.25 MSPS rate requires the input amplifier to settle within the acquisition window - typically less than 200 ns - so choose an op-amp with at least 5x the converter's settling bandwidth.
Compliance Information
RoHS compliance not explicitly stated in verified web data - marker used in specs. TI ADS8402 family is generally lead-free per TI packaging standards; full material declaration should be requested from TI directly. AEC-Q100 not applicable - this is an industrial-grade part.