ADS8383IPFBTG4 - 18-Bit 500kHz SAR ADC, 48-TQFP | Texas Instruments
MPN: ADS8383IPFBTG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.75 | $18.75 |
| 10 | $16.92 | $169.20 |
| 100 | $14.1 | $1,410.00 |
| 250 | $12.65 | $3,162.50 |
| 500 | $11.4 | $5,700.00 |
ADS8383IPFBTG4 Overview
A SAR ADC is a precision data converter architecture that uses a binary-search algorithm across an internal capacitor DAC to resolve each conversion in a fixed number of clock cycles. Compared with delta-sigma and pipeline ADCs, SAR converters offer deterministic latency and excellent linearity at moderate sample rates, making them the preferred choice for multiplexed data-acquisition systems, industrial process control, and instrumentation front-ends where repeatable per-sample timing matters more than the highest possible throughput.
Key specifications include 18-bit no-missing-codes resolution, 500 kSPS maximum throughput, an 18-/16-/8-bit selectable parallel interface, and a true bipolar-capable pseudo-bipolar input stage when driven with a VREF-centered input. The device features a high-impedance CMOS input structure with 4.5 ns aperture delay and excellent common-mode rejection, allowing direct connection to high-impedance sensors and instrumentation amplifiers. The internal sample-and-hold accepts fast-slewing transients, simplifying front-end design.
Typical applications include precision industrial process control, medical instrumentation, optical network power monitoring, vibration analysis, and high-accuracy multi-channel data-acquisition systems. The wide input range and parallel interface are well suited to FPGAs and DSPs in motor control and power-quality monitoring.
When designing with this part, place a low-ESR 1 uF ceramic bypass capacitor directly on the +VA and +VBD pins, plus a 10 uF bulk capacitor, to suppress supply-induced conversion noise. Use a low-impedance ground plane and keep analog and digital return currents separated to within 1 inch of the device.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and PCB design guidance not found in a single source on DigiKey, Mouser, or the TI product folder.
Drop-in alternatives for ADS8383IPFBTG4 — 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 ADS8383IPFBTG4 (same form factor and footprint) — differing in Package, Input Type, Resolution, Architecture, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8383IPFBRG4
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →ADS8383IPFBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8381IBPFBR
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →ADS8382IRHPR
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →ADS8342IBPFBR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.45 / Unit
View Datasheet →ADS8343EB/2K5G4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.4 / Unit
View Datasheet →ADS8383IPFBTG4 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bits |
| Sample Rate | 500 kSPS |
| Architecture | SAR (Successive Approximation) |
| Input Channels | 1 (single-ended, unipolar) |
| Analog Supply Voltage (+VA) | 5 V |
| Digital Supply Voltage (+VBD) | 5 V (3.3 V logic compatible) |
| Analog Input Range | 0 V to +VREF (default); 0 V to 2 x VREF with PGA gain = 2 |
| Reference Voltage (VREF) | 4.0 V typ, 4.5 V max |
| Conversion Time | 1.52 us typ |
| Interface | Parallel, 18-/16-/8-bit selectable |
| INL (max) | 2.5 LSB |
| DNL (max) | 1.5 LSB (-0.99 to +2.5 LSB) |
| SNR | 84 dB typ at 100 kHz input |
| Power Dissipation (500 kSPS) | 110 mW typ |
| Power Dissipation (10 kSPS) | 8 mW typ |
| Aperture Delay | 4.5 ns |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 48-pin TQFP (PFB), 7 mm x 7 mm |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADS8383IPFBTG4 Pin Configuration
| Pin 1 | DVDD — Digital supply (3.3V or 5V) |
| Pin 2 | DGND — Digital ground |
| Pin 3 | DB0 — Data bit 0 (LSB) |
| Pin 4 | DB1 — Data bit 1 |
| Pin 5 | DB2 — Data bit 2 |
| Pin 6 | DB3 — Data bit 3 |
| Pin 7 | DB4 — Data bit 4 |
| Pin 8 | DB5 — Data bit 5 |
| Pin 9 | DB6 — Data bit 6 |
| Pin 10 | DB7 — Data bit 7 |
| Pin 11 | DB8 — Data bit 8 |
| Pin 12 | DB9 — Data bit 9 |
| Pin 13 | DB10 — Data bit 10 |
| Pin 14 | DB11 — Data bit 11 |
| Pin 15 | DB12 — Data bit 12 |
| Pin 16 | DB13 — Data bit 13 |
| Pin 17 | DB14 — Data bit 14 |
| Pin 18 | DB15 — Data bit 15 |
| Pin 19 | DB16 — Data bit 16 |
| Pin 20 | DB17 — Data bit 17 (MSB) |
| Pin 21 | BYTE — 8/16/18-bit mode select |
| Pin 22 | SEQ — Sequential mode select |
| Pin 23 | /BUSY — Conversion-in-progress (active low) |
| Pin 24 | /CS — Chip select (active low) |
| Pin 25 | /RD — Read strobe (active low) |
| Pin 26 | /CONVST — Conversion start (active low) |
| Pin 27 | RESET — Reset input |
| Pin 28 | TAG — Tag input for data tagging |
| Pin 29 | DGND — Digital ground |
| Pin 30 | DVDD — Digital supply |
| Pin 31 | NC — Not connected |
| Pin 32 | NC — Not connected |
| Pin 33 | VREF — Reference voltage input |
| Pin 34 | REFGND — Reference ground |
| Pin 35 | REFM — Reference minus / REFGND |
| Pin 36 | AGND — Analog ground |
| Pin 37 | AVDD — Analog supply (+5V) |
| Pin 38 | AINP — Analog input positive |
| Pin 39 | AINM — Analog input negative / AGND |
| Pin 40 | AGND — Analog ground |
| Pin 41 | AVDD — Analog supply (+5V) |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | AGND — Analog ground |
| Pin 45 | AVDD — Analog supply (+5V) |
| Pin 46 | NC — Not connected |
| Pin 47 | NC — Not connected |
| Pin 48 | AVDD — Analog supply (+5V) |
Typical Applications
ADS8383IPFBTG4 is suitable for 6 applications: Industrial Process Control / PLC, Medical Instrumentation & Patient Monitoring, Optical Network Power Monitoring, Vibration Analysis & Condition Monitoring, Power Quality & Energy Metering, Precision Data-Acquisition Systems (DAQ).
Industrial Process Control / PLC
The ADS8383IPFBTG4's 18-bit no-missing-codes resolution, -40C to +85C industrial temperature range, and 500 kSPS throughput make it a strong fit for PLC analog input modules in industrial process control. Its 0 V to +VREF unipolar input accepts 4-20 mA loop outputs via a 250 ohm current-sense resistor, while 84 dB SNR at 100 kHz input supports high-accuracy measurement of pressure, temperature, and flow transducers. The 48-TQFP package reflow-mounts reliably on standard FR-4, and the parallel interface connects directly to industrial FPGAs in PLC backplanes.
Recommended
Medical Instrumentation & Patient Monitoring
In medical instrumentation such as infusion pumps, blood analyzers, and patient monitors, the ADS8383IPFBTG4 delivers 18-bit resolution at 500 kSPS to digitize low-frequency biosignals with high dynamic range. The integrated sample-and-hold and 4.5 ns aperture delay preserve phase accuracy on ECG and EEG front-ends, while the parallel interface streams data to a DSP for real-time DSP filtering. Its 110 mW power dissipation at full throughput is acceptable for line-powered equipment, and the industrial temperature range supports continuous operation in clinical environments.
Recommended
Optical Network Power Monitoring
Optical line cards and transponder modules use the ADS8383IPFBTG4 to digitize the output of photodiode transimpedance amplifiers monitoring transmit laser power. The 500 kSPS sample rate and 18-bit resolution enable tight closed-loop control of laser bias and modulation currents, stabilizing optical output power across temperature. The device's 84 dB SNR rejects ambient optical noise, and the parallel interface feeds FPGA-based control loops that adjust laser driver DACs in microseconds. Industrial temperature range suits outdoor OLT chassis.
Recommended
Vibration Analysis & Condition Monitoring
Predictive maintenance systems in motors, pumps, and rotating machinery use the ADS8383IPFBTG4 to digitize accelerometer signals for FFT-based vibration analysis. The 500 kSPS sample rate captures vibration harmonics up to 200 kHz (Nyquist), while 18-bit resolution distinguishes early-stage bearing faults by 0.001 g spectral peaks. The deterministic 1.52 us SAR latency simplifies phase-coherent analysis across multiple channels when combined with the ADS8382IRHPR for 4-axis simultaneous sampling on the same PCB footprint.
Recommended
Power Quality & Energy Metering
Three-phase power-quality analyzers and revenue-grade energy meters use the ADS8383IPFBTG4 to digitize voltage and current waveforms with 18-bit accuracy at 500 kSPS. The high dynamic range supports harmonic analysis to the 50th harmonic at 50/60 Hz mains frequency, and the wide input range accommodates current-transformer (CT) and voltage-divider (VT) front-ends. Industrial temperature rating and SAR determinism make it a reliable core for IEC 62053-22 class 0.2S meters deployed in substations and industrial switchgear.
Recommended
Precision Data-Acquisition Systems (DAQ)
Multi-channel DAQ boards for test and measurement applications use the ADS8383IPFBTG4 for the highest-resolution single-channel inputs alongside the ADS8382IRHPR for multiplexed channels. The 18-bit/500 kSPS performance and 48-TQFP package allow up to 8 channels per 4-layer PCB while maintaining 84 dB SNR, supporting LXI-class modular instruments. The parallel interface streams samples directly into FPGA acquisition buffers, enabling sustained 500 kSPS per channel with deterministic timing for waveform capture and protocol analysis.
Recommended
Recommended Products Summary
Engineering reference data for ADS8383IPFBTG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8383IPFBRG4 | ADS8383IPFBT | ADS8381IBPFBR | ADS8382IRHPR | ADS8342IBPFBR | ADS8343EB/2K5G4 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm | 48-QFN (RHP) | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 12 bits |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 250 kSPS | 100 kSPS |
| Input Channels | 1 (single-ended) | 1 (single-ended) | 1 (single-ended) | 1 (single-ended) | 4 (single-ended) | 4 (single-ended) | 4 (single-ended) |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR | SAR |
| Interface | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Serial | Serial | Serial |
| Analog Supply | 5V | 5V | 5V | 5V | 5V | 5V | 2.7V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| 1-piece Price (USD, approx) | 18.75 | 18.75 | 18.75 | 16.50 | 14.20 | 9.85 | 5.40 |
Key Differentiators
- Industry-leading 18-bit single-channel resolution at 500 kSPS (vs ADS8382IRHPR)
- Parallel interface eliminates SPI bit-banging overhead (vs ADS8342IBPFBR / ADS8343EB/2K5G4)
- Genuine industrial temperature grade with single 5V supply (vs ADS8343EB/2K5G4)
Design Notes
Place a 0.1 uF X7R ceramic decoupling capacitor within 2 mm of each AVDD pin (37, 41, 45, 48) and each DVDD pin (1, 30) to suppress high-frequency noise during conversion. Add a 10 uF tantalum or ceramic bulk capacitor on the analog supply rail near the device. The +VA and +VBD supplies should be powered from a low-noise LDO (e.g., TPS7A4701) and decoupled separately; tying AVDD to a noisy 5V switching node will inject 1-2 LSB of conversion noise. Reference: TI ADS8383 datasheet, Section 'Power Supply'.
Use a continuous ground plane under the device and partition it into separate analog (AGND/REFGND) and digital (DGND) islands connected at a single point directly under the device. Route analog input traces (AINP/AINM) as a differential pair to a nearby op-amp (e.g., OPA2277) buffer, and route data bus traces DB0-DB17 matched-length to avoid skew on the 18-bit parallel output. Keep noisy digital lines (RD, CS, CONVST) at least 5 mm away from the analog input and VREF pins.
Drive the AINP input through a low-impedance op-amp buffer (e.g., OPA2277 or AD8628) to prevent source-impedance-induced INL degradation; the ADS8383 samples the input on the falling edge of CONVST, so the buffer must settle to within 0.5 LSB (10 uV at 5V VREF) before acquisition ends. For VREF, use a 4.5V low-noise reference such as REF5045 with a 0.1 uF and 10 uF bypass network; noise on VREF directly couples into SNR and linearity.
Do not leave unused data bus pins (DB16/DB17 for 16-bit mode) floating - tie them to DGND through 10 kohm resistors to avoid CMOS input oscillation. Do not apply a negative voltage to AINP when AGND is at 0V - the input protection diodes will forward-bias and degrade linearity. The /CONVST pin should be a clean falling edge; mechanical switch bounce or slow edges will cause aperture jitter exceeding the 50 ps spec. Always issue a hardware RESET after power-up before the first conversion.
Compliance Information
RoHS compliant per TI product page. Industrial -40C to +85C temperature grade (I-suffix). Not AEC-Q100 qualified; for automotive, consider the ADS8383-Q1 variant if available in portfolio. Lead-free reflow-compatible 48-TQFP package.
