ADS8472IRGZR - 16-Bit 1MSPS SAR ADC w/ 4.096V Ref | Texas Instruments
MPN: ADS8472IRGZR ✓ نشطADS8472IRGZR نظرة عامة
An SAR (Successive Approximation Register) ADC is a converter topology that performs a binary search against the input voltage using an internal capacitive DAC and a comparator. Compared with pipeline or delta-sigma converters, SAR architectures deliver single-cycle latency, deterministic response, and excellent dynamic performance at moderate sampling rates (kHz-to-low-MHz), making them ideal for multiplexed data-acquisition systems, industrial control loops, and instrumentation front-ends.
Key features include true-differential inputs that reject common-mode noise, an internal low-drift 4.096-V reference that eliminates an external reference IC, ±5 V analog supply operation with a dedicated digital supply pin, and a hardware BYTE/WORD pin for bus-width selection. The SAR core achieves 1-MSPS throughput while the integrated reference and input driver maintain DC accuracy across the rated industrial temperature range.
Typical applications include industrial process-control analog input modules, multi-channel data-acquisition systems, precision weigh scales, optical-module monitoring, and motor-control feedback sampling. The pseudo-bipolar differential input accepts ±5 V (or 0 V to +5 V) true-differential signals, allowing direct connection to bridge sensors and current-sense amplifiers without extra signal conditioning.
بدائل مباشرة لـ ADS8472IRGZR — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ADS8472IRGZR (نفس عامل الشكل والبصمة) — يختلف في Package, Input Type, Data Interface, Operating Temperature, Architecture.
ADS8472IBRGZR
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS8472IRGZRG4
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS8472IBRGZTG4
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS8472IRGZTG4
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS8472IRGZR الحدود القصوى والخصائص الكهربائية
| الدقة | 16 bit |
| Sample Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| Input Type | Pseudo-bipolar, fully differential |
| Internal Reference Voltage | 4.096 V |
| Maximum INL | 0.65 LSB |
| Data Interface | Parallel (16-bit or 8-bit byte mode) |
| Analog Supply Voltage | +5 V (typical) |
| Digital Supply Voltage | +3 V to +5 V |
| العلبة | 48-VQFN (7x7 mm) with exposed thermal pad |
| نطاق درجة حرارة التشغيل | -40 C to +85 C (industrial) |
| نوع التركيب | Surface Mount |
| Conversion Time | 0.65 us |
| حالة RoHS | Compliant |
تكوين أطراف ADS8472IRGZR
| دبوس 1 | AGND — Analog ground |
| دبوس 2 | VA — Analog supply (+5V typical) |
| دبوس 3 | IN+ — Positive differential analog input |
| دبوس 4 | IN- — Negative differential analog input |
| دبوس 5 | REF — Internal 4.096 V reference / external reference input |
| دبوس 6 | REFGND — Reference ground return |
| دبوس 7 | CAP1 — Reference bypass capacitor |
| دبوس 8 | CAP2 — Reference bypass capacitor |
| دبوس 9 | AGND — Analog ground |
| دبوس 10 | VA — Analog supply (+5V) |
| دبوس 11 | RESET — Conversion reset (active low) |
| دبوس 12 | CONVST — Conversion start (active low) |
| دبوس 13 | CS — Chip select (active low) |
| دبوس 14 | RD — Read strobe (active low) |
| دبوس 15 | BUSY — Conversion in progress (active high output) |
| دبوس 16 | BYTE/B Y W — 16-bit / 8-bit bus mode select |
| دبوس 17 | DGND — Digital ground |
| دبوس 18 | VD — Digital supply (+3 to +5 V) |
| دبوس 19 | DB15 — Data bit 15 (MSB) |
| دبوس 20 | DB14 — Data bit 14 |
| دبوس 21 | DB13 — Data bit 13 |
| دبوس 22 | DB12 — Data bit 12 |
| دبوس 23 | DB11 — Data bit 11 |
| دبوس 24 | DB10 — Data bit 10 |
| دبوس 25 | DB9 — Data bit 9 |
| دبوس 26 | DB8 — Data bit 8 |
| دبوس 27 | DB7 — Data bit 7 |
| دبوس 28 | DB6 — Data bit 6 |
| دبوس 29 | DB5 — Data bit 5 |
| دبوس 30 | DB4 — Data bit 4 |
| دبوس 31 | DB3 — Data bit 3 |
| دبوس 32 | DB2 — Data bit 2 |
| دبوس 33 | DB1 — Data bit 1 |
| دبوس 34 | DB0 — Data bit 0 (LSB) |
| دبوس 35 | DGND — Digital ground |
| دبوس 36 | TAG — Tag/versioning pin |
| دبوس 37 | NC — Not connected (per datasheet) |
| دبوس 38 | NC — Not connected (per datasheet) |
| دبوس 39 | NC — Not connected (per datasheet) |
| دبوس 40 | NC — Not connected (per datasheet) |
| دبوس 41 | NC — Not connected (per datasheet) |
| دبوس 42 | NC — Not connected (per datasheet) |
| دبوس 43 | NC — Not connected (per datasheet) |
| دبوس 44 | NC — Not connected (per datasheet) |
| دبوس 45 | REFEN — Internal reference enable (active high) |
| دبوس 46 | VA — Analog supply (+5V) |
| دبوس 47 | AGND — Analog ground |
| دبوس 48 | VA — Analog supply (+5V) |
التطبيقات النموذجية
ADS8472IRGZR مناسب لـ 6 التطبيقs: Industrial Process-Control Analog Input Modules, Multi-Channel Data-Acquisition Systems, Precision Weigh-Scale and Load-Cell Front-Ends, Optical Module Bias Monitoring and Feedback, Motor-Drive Current and Voltage Sampling, Battery-Management and Cell-Monitoring Systems.
Industrial Process-Control Analog Input Modules
The ADS8472IRGZR fits isolated process-control input modules by offering 16-bit, 1-MSPS SAR conversion with an internal 4.096-V reference. Its pseudo-bipolar differential input rejects common-mode ground shifts typical of long sensor cables in plant floors. Placed after a front-end instrumentation amp, the converter sustains deterministic single-cycle latency required by closed-loop PID control. Compared with delta-sigma alternatives, the SAR architecture removes digital-filter latency that would otherwise destabilize multi-axis positioning loops.
موصى به
Multi-Channel Data-Acquisition Systems
Multi-channel DAQ backplanes use the ADS8472IRGZR to digitize multiplexed analog signals at 1 MSPS per channel. The parallel 16-bit (or 8-bit byte) interface delivers data directly into an FPGA or MCU without DMA stalls, while the integrated 4.096-V reference scales cleanly across the input common-mode range. The 48-VQFN package keeps per-channel board area small, allowing dense multiplexer + ADC + isolator stacks on a single backplane.
موصى به
Precision Weigh-Scale and Load-Cell Front-Ends
Weigh-scale and load-cell signal chains leverage the ADS8472IRGZR's 16-bit SAR resolution and true-differential input. The internal 4.096-V reference pairs with bridge sensors to give a direct scale to ADC scale ratio, while 1-MSPS throughput allows time-division multiplexing of multiple load cells around a single converter. Ground-noise rejection inherent to the differential front-end lets design engineers keep PCB copper short and reduce cable shielding cost.
موصى به
Optical Module Bias Monitoring and Feedback
Optical transmit modules (SFP, QSFP) use the ADS8472IRGZR to monitor laser-bias current and back-facet photodiode voltage for closed-loop APC. The SAR converter's single-cycle latency preserves timing margin in Mach-Zehnder and directly-modulated laser controls, while the 4.096-V reference covers the +/-2 V photodiode swings when buffered. The 48-VQFN footprint fits inside the small module cage area alongside the laser driver and TEC controller.
موصى به
Motor-Drive Current and Voltage Sampling
Servo and variable-frequency drives sample current-shunt and DC-bus voltages through the ADS8472IRGZR. The 1-MSPS update rate synchronizes with PWM carriers up to 16 kHz, capturing overcurrent events within 1 us of occurrence. The differential input accepts +/-VREF swings from bidirectional current-sense amps and eliminates ground-loops that would corrupt low-side shunt measurements at high di/dt.
موصى به
Battery-Management and Cell-Monitoring Systems
In Li-ion and industrial battery stacks, the ADS8472IRGZR serves as the cell-voltage ADC with built-in 4.096-V reference covering the 0-5 V cell measurement range. Multiple series cells are multiplexed into one converter, and the SAR's deterministic latency keeps the management MCU's state machine timing predictable. Industrial -40 to +85 C rating supports automotive under-hood and grid-storage deployments.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADS8472IRGZR — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADS8472IBRGZR | ADS8472IRGZRG4 | ADS8472IBRGZTG4 | ADS8472IRGZTG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-VQFN (7x7) | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Input Type | Pseudo-bipolar differential | Pseudo-bipolar differential | Pseudo-bipolar differential | Pseudo-bipolar differential | Pseudo-bipolar differential |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Maximum INL | 0.65 LSB (standard grade) | B-grade INL (tighter) | 0.65 LSB | B-grade INL (tighter) | 0.65 LSB |
| RoHS Status | Compliant | Compliant | Compliant (G4 lead-free) | Compliant | Compliant (G4 lead-free) |
أبرز الفروقات
- Drop-in B-grade INL upgrade path on the same footprint (مقابلADS8472IBRGZR)
- Lead-free G4 finish is fully RoHS compliant for green designs (مقابلADS8472IRGZRG4)
- Tape-and-reel packaging optimized for high-volume SMT lines (مقابلADS8472IBRGZTG4)
- Internal 4.096-V reference removes one external IC (مقابلExternal reference designs)
ملاحظات التصميم
The ADS8472IRGZR requires that REFEN be tied high to enable the internal 4.096-V reference; if REFEN is left floating or tied low, the reference shuts down and conversions will be non-functional. Decouple the +5V VA supply close to pins 2, 10, 46, and 48 with 10uF + 0.1uF ceramic capacitors to keep the SAR comparator supply clean. When driving the differential inputs from a single-ended source, bias the IN- pin to VA/2 using a low-noise buffer; failing to do so collapses the common-mode and degrades THD.
Keep the analog ground plane unbroken under and around the ADS8472IRGZR. Place the AGND pins directly to the analog plane via short, wide traces. Route parallel digital data bus lines away from IN+/IN- and the CAP1/CAP2 reference pins; use a logical split between the AGND and DGND planes at a single point near the converter. The exposed thermal pad must be soldered to a copper pour on the top layer for thermal relief even at moderate duty cycles.
Estimated: at 1-MSPS output drive, the 16-bit parallel bus toggles every 1 us and creates ~3.2 ns edges on the DGND return. Source-terminate DB15..DB0 with 22-33 ohm series resistors close to the ADS8472IRGZR if the bus length exceeds 50 mm to limit ringing. Add a small ferrite bead between VA and VD at the PCB entry to keep ADC clock harmonics from leaking back into the analog supply.
معلومات الامتثال
RoHS/REACH compliance per TI product page. Not AEC-Q100 qualified - for automotive ADC designs use TI's AEC-Q100-qualified SAR ADCs in the same family. Lead-free per G4 suffix variants.
