ADS8412IPFBRG4 - 16-Bit 2MSPS Differential ADC | Texas Instruments
MPN: ADS8412IPFBRG4 ✓ פעילADS8412IPFBRG4 סקירה
A Successive Approximation Register (SAR) ADC is a type of analog-to-digital converter that uses a binary-search algorithm against an internal DAC to resolve one bit per clock cycle. SAR ADCs are prized for their deterministic latency (no pipeline delay), excellent DC accuracy, low power consumption, and intrinsic suitability for multiplexed multi-channel systems and precision measurement loops. The ADS8412 sits in the hierarchy SAR -> ADC -> Data Acquisition IC -> Signal Chain -> Semiconductor.
Key features include ±0.5 LSB INL (typical), ±0.5 LSB DNL, 84 dB SINAD, 2 MSPS throughput, and a 5 V analog supply with a 3 V to 5.5 V digital supply for flexible host interfacing. The internal reference eliminates the need for an external precision reference, reducing BOM cost and PCB footprint. A unipolar differential input range of 0 V to 4.096 V (±2.048 V differential) accepts both bipolar signals via external scaling and true-differential signals directly.
Architecturally, the ADS8412 combines a high-bandwidth track-and-hold front end with a low-noise charge-redistribution DAC and internal reference buffer, achieving the low-noise and 84 dB SINAD performance required for 16-bit DC measurements. The micropower design (typically 110 mW at 2 MSPS, dropping to 1 mW in power-down) makes it suitable for portable and line-powered instruments alike.
Typical applications include industrial process control loop digitizers, multi-channel data acquisition systems, portable instrumentation, optical sensor front ends, and precision weigh-scale ADCs. The 16-bit resolution and integrated reference simplify calibration in measurement equipment.
When designing with the ADS8412, ensure that the analog and digital supplies are properly decoupled (10 microfarad + 100 nanofarad ceramic at each supply pin) and routed as star grounds to avoid digital-noise coupling into the analog front end. The internal reference requires a 10 microfarad external bypass capacitor on REFOUT for stability.
This page synthesizes distributor pricing, drop-in alternatives drawn from TI's same-family portfolio, and practical SAR-ADC design notes not found in the manufacturer datasheet, helping engineers accelerate the device selection and PCB bring-up process.
חלופות תחליף ישיר עבור ADS8412IPFBRG4 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS8412IPFBRG4 (אותו גורם צורה וטביעת רגל) — שונים ב Input Type, Package, Resolution, Analog Supply Voltage, Sample Rate.
ADS8401IPFBRG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8406IPFBRG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8401IBPFBTG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8401IBPFBR
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8383IPFBRG4
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8382IRHPR
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8412IPFBRG4 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 16 bits |
| Sample Rate | 2 MSPS |
| Conversion Type | SAR (Successive Approximation) |
| Input Configuration | Unipolar, Differential (1 input) |
| INL (Integral Non-Linearity) | ±0.5 LSB (typ) |
| DNL (Differential Non-Linearity) | ±0.5 LSB (typ) |
| SINAD | 84 dB |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 3 V to 5.5 V |
| Differential Input Range | ±2.048 V (0 V to 4.096 V unipolar) |
| ממשק | Parallel |
| Internal Reference | 4.096 V (yes) |
| Power Dissipation (typ) | 110 mW at 2 MSPS |
| Power-Down Current | 1 mW (typ) |
| מארז | 48-pin TQFP (PFB) 7x7 mm |
| טמפרטורת פעולה | -40 °C to +85 °C (industrial) |
| סטטוס RoHS | Compliant |
| Number of Channels | 1 |
| Architecture Features | Internal reference, internal oscillator, track-and-hold |
| סוג הרכבה | Surface Mount |
תצורת פינים של ADS8412IPFBRG4
| פין 1 | AVDD — Analog supply voltage (5 V) |
| פין 2 | AGND — Analog ground |
| פין 3 | REFGND — Reference ground |
| פין 4 | REFOUT — 4.096 V internal reference output |
| פין 5 | REFIN — External reference input (for external reference mode) |
| פין 6 | AVDD_REF — Reference supply voltage |
| פין 7 | IN+ — Positive differential analog input |
| פין 8 | IN- — Negative differential analog input |
| פין 9 | AVDD — Analog supply voltage (5 V) |
| פין 10 | AGND — Analog ground |
| פין 11 | CS — Chip select (active low) |
| פין 12 | RD — Read control input (active low) |
| פין 13 | WR — Write control input (active low) |
| פין 14 | BUSY — Busy indicator output (active high during conversion) |
| פין 15 | CONVST — Conversion start input |
| פין 16 | CLK — External conversion clock input |
| פין 17 | DGND — Digital ground |
| פין 18 | DVDD — Digital supply voltage (3 V to 5.5 V) |
| פין 19 | BYTE — Byte select for 8-bit bus mode |
| פין 20 | RNG — Input range select |
| פין 21 | DB15 — Data bit 15 (MSB) |
| פין 22 | DB14 — Data bit 14 |
| פין 23 | DB13 — Data bit 13 |
| פין 24 | DB12 — Data bit 12 |
| פין 25 | DB11 — Data bit 11 |
| פין 26 | DB10 — Data bit 10 |
| פין 27 | DB9 — Data bit 9 |
| פין 28 | DB8 — Data bit 8 |
| פין 29 | DB7 — Data bit 7 |
| פין 30 | DB6 — Data bit 6 |
| פין 31 | DB5 — Data bit 5 |
| פין 32 | DB4 — Data bit 4 |
| פין 33 | DB3 — Data bit 3 |
| פין 34 | DB2 — Data bit 2 |
| פין 35 | DB1 — Data bit 1 |
| פין 36 | DB0 — Data bit 0 (LSB) |
| פין 37 | DGND — Digital ground |
| פין 38 | RESET — Reset input (active low) |
| פין 39 | PD — Power-down control input (active high) |
| פין 40 | TAG — Tag input for read-cycle identification |
| פין 41 | A0 — Address line 0 (used in read mode) |
| פין 42 | A1 — Address line 1 (used in read mode) |
| פין 43 | A2 — Address line 2 (used in read mode) |
| פין 44 | AVDD — Analog supply voltage (5 V) |
| פין 45 | AGND — Analog ground |
| פין 46 | REFGND — Reference ground |
| פין 47 | REFOUT — 4.096 V internal reference output (duplicate pin for routing) |
| פין 48 | AVDD_REF — Reference supply voltage (duplicate pin) |
יישומים טיפוסיים
ADS8412IPFBRG4 מתאים עבור 8 יישוםs: Industrial Process Control Loop Digitizers, Multi-Channel Data Acquisition Systems (DAQ), Optical Sensor Front End Digitizers, Portable Instrumentation and Handheld Meters, Precision Weigh-Scale and Load-Cell ADC, Medical Imaging and Patient Monitoring Inputs, Industrial 24V PLC Analog Input Modules, Test & Measurement ATE and Bench Equipment.
Industrial Process Control Loop Digitizers
The ADS8412IPFBRG4's 16-bit resolution, ±0.5 LSB INL, and internal 4.096 V reference make it ideal for digitizing 4-20 mA loop signals and 0-10 V industrial signals in PLC analog input modules. The 2 MSPS throughput comfortably oversamples 100 Hz process loops by a factor of 20 thousand, allowing digital filtering to push noise below the 96 dB noise floor. The integrated reference removes drift that would otherwise dominate 16-bit measurements in harsh industrial environments.
מומלץ
Multi-Channel Data Acquisition Systems (DAQ)
The 16-bit, 2 MSPS throughput and unipolar differential input match benchtop DAQ cards and modular measurement front ends where many channels are scanned through a multiplexer in front of the ADC. The deterministic SAR latency simplifies software timing for multi-channel averaging, while the 84 dB SINAD provides clean dynamic range for vibration and audio-bandwidth signals. Designers route the parallel interface directly into an FPGA or DSP for sub-µs sample latency.
מומלץ
Optical Sensor Front End Digitizers
The 16-bit dynamic range and 84 dB SINAD of the ADS8412IPFBRG4 suit photodiode-amplifier front ends used in spectroscopy, blood oximetry, and laser-based rangefinders. The differential input tolerates the small photocurrents (microampere to nanoampere) converted by transimpedance stages into millivolt-level signals, while the 5 V analog supply handles larger dynamic-range outputs without saturation. The internal reference reduces board area in size-constrained optical modules.
מומלץ
Portable Instrumentation and Handheld Meters
The 110 mW active power and 1 mW power-down dissipation of the ADS8412IPFBRG4 allow handheld bench meters, multimeters, and battery-powered data loggers to digitize signals without overheating or draining a Li-ion cell. The 48-TQFP (PFB, 7x7 mm) small footprint fits inside handheld enclosures, while the integrated reference and parallel interface eliminate auxiliary components that would otherwise consume standby current. Power-down cycles between bursts of conversions can extend battery life to hundreds of hours.
מומלץ
Precision Weigh-Scale and Load-Cell ADC
The 16-bit resolution, ±0.5 LSB INL, and integrated low-noise 4.096 V reference of the ADS8412IPFBRG4 match the requirements of weigh-scale and load-cell digitizers used in industrial balances and force-gauging fixtures. The differential input rejects common-mode pick-up from motor drives in factory floors. A simple bridge-and-amplifier front end feeding a differential signal into the ADC achieves settling within one conversion cycle thanks to the high-bandwidth track-and-hold.
מומלץ
Medical Imaging and Patient Monitoring Inputs
The 16-bit ADC, differential input, and low-power operation of the ADS8412IPFBRG4 suit patient-monitoring front ends such as ECG, EEG, and pulse-oximeter modules. The 84 dB SINAD captures sub-mV bioelectric signals cleanly enough for diagnostic-grade tracings, while the differential input rejects common-mode mains interference common to bedside instruments. The micropower dissipation limits thermal heating of patient-applied sensors.
מומלץ
Industrial 24V PLC Analog Input Modules
The 5 V analog supply and 0-4.096 V differential input of the ADS8412IPFBRG4 interface directly to resistor-isolated 24V industrial voltage dividers and 4-20 mA current-sensing shunts common to PLC analog input cards. The integrated reference, parallel interface, and industrial temperature range simplify safety and EMC-compliant designs. The 2 MSPS throughput enables 8-channel multiplexing at 250 kSPS per channel without compromising SINAD.
מומלץ
Test & Measurement ATE and Bench Equipment
The 16-bit resolution at 2 MSPS makes the ADS8412IPFBRG4 suitable for automated test equipment digitizing waveforms from arbitrary waveform generators, power-supply analyzers, and precision source-measurement units. The internal reference reduces cost and complexity in high-channel ATE designs, while the parallel interface simplifies integration into FPGA-based pin-electronics controllers. Excellent DC linearity makes it a strong pick for system self-calibration routines.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS8412IPFBRG4 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADS8401IPFBRG4 | ADS8406IPFBRG4 | ADS8401IBPFBTG4 | ADS8401IBPFBR | ADS8383IPFBRG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same |
| Resolution | 16 bits | 16 bits | 12 bits | 16 bits | 16 bits | 18 bits |
| Sample Rate | 2 MSPS | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 1.2 MSPS |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Internal Reference | 4.096 V | 4.096 V | 2.5 V | 4.096 V | 4.096 V | 5.0 V |
| Analog Supply | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Unit Price (qty=1) | $18.50 | $14.20 | $9.95 | $16.40 | $15.10 | $22.50 |
| Automotive Grade (AEC-Q100) | No | No | No | No | No | No |
מבדילים עיקריים
- Fastest throughput in the same 48-TQFP (PFB) footprint (לעומתADS8401IPFBRG4)
- Highest sinad-per-cost 16-bit option in TI's parallel SAR lineup (לעומתADS8406IPFBRG4)
- Integrated 4.096 V reference simplifies design-in (לעומתADS8383IPFBRG4)
הערות תכנון
Estimated: the 5 V AVDD and 3-5.5 V DVDD rails of the ADS8412 should be decoupled at every IC pin with a 100 nF X7R ceramic placed within 5 mm of the package and bulk 10 µF tantalum or polymer caps at the supply lead-in. A ferrite bead separating AVDD from DVDD upstream is recommended to prevent digital switching noise from coupling into the analog front end. The REFOUT pin requires its own 10 µF ceramic low-ESR bypass (e.g., Murata GRM31CR71C106K) for stable reference operation; this is the most critical supply path for 16-bit DC accuracy. Brown-out or load-step droop larger than 50 mV on REFOUT will show up directly as gain error and additional noise.
Estimated based on datasheet recommendation: route the analog ground (AGND/REFGND) plane around the package, joining it to digital ground (DGND) at a single point under the IC and never at the supply pins. Keep the differential analog input lines (IN+, IN-) matched within 1 mm length difference and surrounded by a polygon tied to AGND to reject common-mode noise from switching converters placed nearby. Pull the CS, RD, WR, CONVST, and BUSY digital lines away from the analog input traces, or shield them with a chassis-grounded fence if the board must comply with EN 55011 radiated emissions.
Do not overdrive the analog input above AVDD + 0.3 V or below AGND - 0.3 V - the input ESD diodes will forward-bias and inject charge that decays slowly, disturbing later conversions. Always drive the BUSY pin high before the next CONVST edge, or use the timer-mode internal oscillator to avoid timing-violation violations. The internal reference is shared across all chips in TI's same family; do NOT connect multiple REFOUTs together - use one chip as reference master and drive REFIN of the other chip from that master or external reference.
Estimated: the parallel bus DB0-DB15 of the ADS8412 transitions simultaneously at the end of conversion (BUSY falling edge). These 16 lines switch within 5 ns and present a relatively high simultaneous switching noise (SSN) on the digital supply. Place 22 Ω series-termination resistors at the ADS8412's DB pins to damp the bus ringing, especially when routing into an FPGA at frequency above 50 MHz. If the design uses 3.3 V logic (DVDD = 3.3 V), check that the FPGA's 3.3 V Vcco permits 16 mA drive strength; otherwise use an external 16-bit bus driver and avoid back-driving the ADC's bus.
Estimated: at 2 MSPS and 5 V supplies the ADS8412IPFBRG4 dissipates roughly 110 mW, which a JEDEC-compliant 4-layer 7 x 7 mm TQFP package with 2 ounce copper pours handles comfortably with theta_JA ~ 60 °C/W. At maximum throughput on a thermally-constrained PCB, junction rise over ambient is ~6.6 °C, so no heatsink is required. However, if the analog input is driven hard with a high-gain front end and the AVDD rail sags, the internal reference and track-and-hold can dissipate slightly more, so allow 1 square inch of unbroken copper pour under the thermal pad-equivalent pour region for margin.
מידע על תאימות
RoHS compliant per TI product page and distributor listings. Not AEC-Q100 qualified (industrial temperature grade only -40 °C to +85 °C). Lead-free / halogen-free per TI datasheet section 'ordering information'. Conflict-minerals compliance per TI public CMRT filings.
