ADS8383IPFBRG4 - 18-Bit 500kHz Parallel SAR ADC | Texas Instruments
MPN: ADS8383IPFBRG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.62 | $166.20 |
| 100 | $14.8 | $1,480.00 |
| 500 | $13.36 | $6,680.00 |
| 1,000 | $11.95 | $11,950.00 |
ADS8383IPFBRG4 Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a comparator, an internal DAC, and a successive-approximation register to perform a binary search across the analog input on each conversion cycle. SAR ADCs are valued for low-latency deterministic conversion, excellent DC accuracy, and superior dynamic performance compared to many delta-sigma converters of similar speed, making them the converter of choice for multiplexed data-acquisition systems, instrumentation, and control loops. The ADS8383 belongs to the broader data-converter IC family within TI's precision-mixed-signal portfolio, sitting alongside pipeline and delta-sigma converters in the signal-chain hierarchy.
Key features include 18-bit resolution with no missing codes, a true bipolar or unipolar differential input option, a hardware-friendly conversion-start (CONVST) pin, a busy/end-of-conversion indicator, a programmable reference, low-power dissipation, and a -40C to +85C industrial operating range. The wide parallel interface allows direct connection to microcontrollers, FPGAs, and DSPs with 8, 16, or 32-bit data buses, eliminating the need for an external serializer and minimizing glue logic.
The architecture combines an input sample-and-hold, an internal conversion clock, calibration logic, and a flexible digital interface to produce low-noise, low-distortion conversions at 500 kSPS. Designers can disable unused sections to reduce power, and the device supports both unipolar (0 V to VREF) and true-bipolar (+/-VREF) input configurations for maximum signal-chain flexibility.
Typical applications include industrial process control, multi-channel data-acquisition systems, medical instrumentation, optical networking modules, vibration and acoustic analysis, and precision sensor front ends. The 500 kSPS throughput and 18-bit noise floor suit it well for closed-loop servo control and high-accuracy measurement front-ends.
When designing with the ADS8383, allocate separate analog and digital ground planes joined at a single star point near the IC, decouple both AVDD and DVDD with low-ESR ceramic capacitors placed within 3 mm of each supply pin, and provide a low-impedance low-noise external reference (such as the REF5050) for best linearity.
This page aggregates parametric data from the manufacturer datasheet, current distributor inventory, and cross-reference alternatives - giving engineers a more complete procurement and design picture than the bare datasheet alone.
Drop-in alternatives for ADS8383IPFBRG4 — 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 ADS8383IPFBRG4 (same form factor and footprint) — differing in Package, Input Type, Sample Rate, Operating Temperature, Conversion Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8383IPFBR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8383IPFBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8383IPFBTG4
✅ Drop-In✓ In Stock
$11.4 / Unit
View Datasheet →ADS8361IPFBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8382IRHPR
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →ADS8383IPFBRG4 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bit |
| Sample Rate | 500 kSPS |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Input Type | Unipolar (pseudo-bipolar option) |
| Conversion Time | 1.52 us (typ) |
| Analog Supply Voltage (AVDD) | 5 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.25 V |
| Digital Interface | Parallel (18-bit / 16-bit / 8-bit) |
| Package | 48-TQFP (7x7 mm) |
| Number of Pins | 48 |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Temperature Grade | Industrial |
| RoHS Status | Compliant |
| Terminal Form | GULL WING |
| Package Code | TFQFP |
ADS8383IPFBRG4 Pin Configuration
| Pin 1 | AVDD — Analog power supply, 5 V |
| Pin 2 | AVSS — Analog ground |
| Pin 3 | REF — Reference input/output, decouple to AVSS |
| Pin 4 | IN — Analog input |
| Pin 5 | AVSS — Analog ground |
| Pin 6 | AVDD — Analog power supply, 5 V |
| Pin 7 | BYPS — Internal reference bypass node |
| Pin 8 | PWDN — Hardware power-down, active low |
| Pin 9 | CONVST — Conversion start input |
| Pin 10 | BUSY — Active-high busy / end of conversion indicator |
| Pin 11 | CS — Chip select, active low |
| Pin 12 | RD — Read strobe, active low |
| Pin 13 | DVDD — Digital power supply, 2.7 V to 5.25 V |
| Pin 14 | DVSS — Digital ground |
| Pin 15 | DB0 — Parallel data bit 0 (LSB) |
| Pin 16 | DB1 — Parallel data bit 1 |
| Pin 17 | DB2 — Parallel data bit 2 |
| Pin 18 | DB3 — Parallel data bit 3 |
| Pin 19 | DB4 — Parallel data bit 4 |
| Pin 20 | DB5 — Parallel data bit 5 |
| Pin 21 | DB6 — Parallel data bit 6 |
| Pin 22 | DB7 — Parallel data bit 7 |
| Pin 23 | DB8 — Parallel data bit 8 |
| Pin 24 | DB9 — Parallel data bit 9 |
| Pin 25 | DB10 — Parallel data bit 10 |
| Pin 26 | DB11 — Parallel data bit 11 |
| Pin 27 | DB12 — Parallel data bit 12 |
| Pin 28 | DB13 — Parallel data bit 13 |
| Pin 29 | DB14 — Parallel data bit 14 |
| Pin 30 | DB15 — Parallel data bit 15 |
| Pin 31 | DB16 — Parallel data bit 16 |
| Pin 32 | DB17 — Parallel data bit 17 (MSB) |
| Pin 33 | TAG — Tag bit for output word identification |
| Pin 34 | BIT/BYTE — Interface mode select (parallel / byte) |
| Pin 35 | RANGE — Input range select (0 to VREF / +/-VREF) |
| Pin 36 | AGND — Analog ground |
| Pin 37 | TEST — Factory test pin (leave floating or tie to AVSS) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | REFGND — Reference ground (tie to AVSS) |
| Pin 42 | DVDD — Digital power supply, 2.7 V to 5.25 V |
| Pin 43 | DVSS — Digital ground |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | AVDD — Analog power supply, 5 V |
| Pin 48 | AVSS — Analog ground |
Typical Applications
ADS8383IPFBRG4 is suitable for 6 applications: Industrial Process Control Data Acquisition, Medical Instrumentation Signal Chains, Precision Sensor Front-End Modules, Optical Network Transponder Monitoring, Vibration and Acoustic Analysis Systems, Multi-Rail Power-Supply Monitoring.
Industrial Process Control Data Acquisition
The ADS8383IPFBRG4's 18-bit resolution and 500 kSPS throughput suit it to multi-channel data-acquisition front-ends that sample sensor signals from thermocouples, RTDs, strain gauges, and process-control transducers in factory automation. With 1.52 us conversion time, the ADC easily handles multiplexed 8- or 16-channel scan rates above 30 kSPS per channel. Low integral nonlinearity preserves measurement accuracy over the full industrial -40C to +85C range, while the parallel interface streams data directly into a host MCU, FPGA, or DSP without glue logic. Pair the ADC with the REF5050 reference and an OPA2277 input buffer for a complete 18-bit analog input module for PLC and DCS systems.
Recommended
Medical Instrumentation Signal Chains
For medical instrumentation including patient monitors, infusion-pump controllers, and bench-top analyzers, the ADS8383IPFBRG4 offers the 18-bit dynamic range needed to resolve microvolt-level bioelectric signals after front-end amplification. The 500 kSPS throughput captures physiological waveforms such as ECG, EMG, and SpO2 pulse oximetry while leaving headroom for digital filtering. The 48-TQFP package fits compact, IEC 60601-style board layouts, and the wide digital-supply range (2.7 V to 5.25 V) enables direct connection to 3.3 V microcontrollers. Combine with a precision front end such as the INA118 instrumentation amplifier for best signal fidelity.
Recommended
Precision Sensor Front-End Modules
Strain-gauge bridges, load cells, pressure transducers, and weighing scales benefit from the ADC's 18-bit no-missing-code performance and low noise floor, which preserve the smallest weight or pressure changes after amplification. The 500 kSPS sample rate keeps up with high-bandwidth load-cell transient response, while the parallel interface feeds data directly into the host processor for digital filtering, calibration, and temperature compensation. Using a 5 V reference such as REF5050, designers achieve better than 16-bit effective resolution across the full industrial temperature range - more than adequate for legal-for-trade weigh scales and precision force measurement.
Recommended
Optical Network Transponder Monitoring
In optical networking transponder and line-card designs, the ADS8383IPFBRG4 monitors laser-bias currents and receive-side photodiode signals with 18-bit dynamic range. The 500 kSPS throughput continuously samples AGC, laser-driver feedback, and wavelength-of-channel telemetry for adaptive equalization. The -40C to +85C industrial operating range and small 48-TQFP footprint suit it to compact hot-pluggable module layouts. The wide parallel interface is compatible with FPGA-based forward-error-correction engines and cross-connect ASICs used in long-haul and metro transponders, while the 5 V analog supply noise floor does not exceed the photodiode shot-noise floor.
Recommended
Vibration and Acoustic Analysis Systems
Condition-monitoring systems deployed on rotating machinery use the ADS8383IPFBRG4 to digitize vibration and acoustic-emission signals at 500 kSPS with 18-bit resolution, capturing bearing-fault signatures at full bandwidth. The deterministic SAR latency produces no conversion-time jitter, which is critical for accurate synchronous analysis alongside tachometer and phase-reference inputs. Engineers feed the parallel output into an FPGA or DSP for envelope detection, FFT analysis, and bearing-fault frequency tracking. With wide temperature tolerance and a flexible 18/16/8-bit bus, the part fits both compact wireless sensor modules and rack-mounted vibration analyzers.
Recommended
Multi-Rail Power-Supply Monitoring
Within ATE and telecom equipment, the ADS8383IPFBRG4 monitors multiple voltage rails via an external analog multiplexer, sampling each rail at hundreds of kSPS while a host MCU sequences the channels and aggregates results. The ADC's 18-bit resolution captures the small voltage margins of 0.8 V cores and 1.2 V DDR rails while the wide analog supply range supports 3.3 V, 5 V, and 12 V system buses via resistive dividers. The 48-TQFP package is small enough to integrate into the monitor card while providing easy scope probing. Combined with a FIFO buffer or FPGA, the part enables per-rail voltage-trend logging for fault diagnostics.
Recommended
Recommended Products Summary
Engineering reference data for ADS8383IPFBRG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8383IPFBR | ADS8383IPFBT | ADS8383IPFBTG4 | ADS8361IPFBT | ADS8382IRHPR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB, 7x7 mm) | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP - same | 48-TQFP family footprint |
| Resolution | 18 bit | 18 bit | 18 bit | 18 bit | 16 bit (-11%) | 16 bit (-11%) |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Analog Supply | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Digital Interface | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Parallel (18/16/8-bit) | Parallel | Parallel (16-bit) |
| RoHS / Pb-Free | Yes (G4 suffix) | Yes | Yes | Yes (G4 suffix) | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- True 18-bit resolution with configurable parallel bus width (vs ADS8361IPFBT)
- RoHS-compliant lead-free version (G4 suffix) (vs ADS8383IPFBR (base catalog reel))
- 18-bit vs 16-bit equivalent at same throughput in TQFP package (vs ADS8382IRHPR)
Design Notes
Use a four-layer PCB with separate analog and digital ground planes joined at a single star point beneath the ADC ground pins. Place 10 uF + 100 nF X5R ceramic decoupling within 3 mm of each AVDD pin and 100 nF within 3 mm of each DVDD pin. Keep analog input traces short and guarded by AVSS on both sides to minimize injected digital noise. The REF pin should be decoupled with a 10 uF + 100 nF low-ESR ceramic pair routed to the reference ground plane - layout here directly affects 18-bit linearity.
Power the analog 5 V AVDD rail from a low-noise linear regulator (such as TPS7A4701 or REF5050-derived LDO) rather than directly from a switching converter. The ADS8383IPFBRG4 has no internal analog supply rejection at the switching frequencies of typical DC-DC converters; any switching noise above 20 kHz couples directly into the ADC output as spurious tones. If a switching pre-regulator is unavoidable, post-filter the AVDD rail with a ferrite bead and additional LC pi-section.
Do not leave the BYPS pin floating - it requires a 0.1 uF ceramic bypass capacitor to AVSS for internal reference stability, otherwise gain error may exceed 1%. The TEST pin must be left floating or tied to AVSS; driving it low or high can engage factory test modes. The CONVST input has minimum pulse-width and setup-time requirements (see datasheet AC timing); violating them results in degraded SNR rather than a hard error. Finally, ensure the input signal settles within 1.52 us before the next CONVST pulse or use the front-end amplifier's bandwidth to a fraction of the sample rate.
Route the 18-bit parallel data bus DB[17:0] in a controlled-impedance group with series damping resistors (22 ohm to 33 ohm) at the ADC end if the bus length exceeds 50 mm. Add a ground trace between adjacent data lines to suppress crosstalk. The CONVST, BUSY, CS, and RD control signals should be routed together and length-matched to the data bus within 5 mm to minimize timing skew. For 18-bit systems at high ambient temperatures, derate sample rate linearly above 70C to avoid exceeding internal timing margins.
Compliance Information
RoHS compliant per the G4 suffix in the orderable part number. The base catalog ADS8383IPFBR is also lead-free per TI's datasheet marking. Not AEC-Q100 qualified - not recommended for automotive safety-critical designs; consult TI's automotive-grade SAR ADC portfolio instead.
