ADS8472IRGZR - 16-Bit 1MSPS SAR ADC w/ 4.096V Ref | Texas Instruments
MPN: ADS8472IRGZR ✓ Hoạt độngADS8472IRGZR Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ADS8472IRGZR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADS8472IRGZR (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Data Interface, Operating Temperature, Architecture.
ADS8472IBRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8472IRGZRG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8472IBRGZTG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8472IRGZTG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8472IRGZR Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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 |
| Hộp | 48-VQFN (7x7 mm) with exposed thermal pad |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Kiểu lắp đặt | Surface Mount |
| Conversion Time | 0.65 us |
| Trạng thái RoHS | Compliant |
Cấu hình chân ADS8472IRGZR
| Chân 1 | AGND — Analog ground |
| Chân 2 | VA — Analog supply (+5V typical) |
| Chân 3 | IN+ — Positive differential analog input |
| Chân 4 | IN- — Negative differential analog input |
| Chân 5 | REF — Internal 4.096 V reference / external reference input |
| Chân 6 | REFGND — Reference ground return |
| Chân 7 | CAP1 — Reference bypass capacitor |
| Chân 8 | CAP2 — Reference bypass capacitor |
| Chân 9 | AGND — Analog ground |
| Chân 10 | VA — Analog supply (+5V) |
| Chân 11 | RESET — Conversion reset (active low) |
| Chân 12 | CONVST — Conversion start (active low) |
| Chân 13 | CS — Chip select (active low) |
| Chân 14 | RD — Read strobe (active low) |
| Chân 15 | BUSY — Conversion in progress (active high output) |
| Chân 16 | BYTE/B Y W — 16-bit / 8-bit bus mode select |
| Chân 17 | DGND — Digital ground |
| Chân 18 | VD — Digital supply (+3 to +5 V) |
| Chân 19 | DB15 — Data bit 15 (MSB) |
| Chân 20 | DB14 — Data bit 14 |
| Chân 21 | DB13 — Data bit 13 |
| Chân 22 | DB12 — Data bit 12 |
| Chân 23 | DB11 — Data bit 11 |
| Chân 24 | DB10 — Data bit 10 |
| Chân 25 | DB9 — Data bit 9 |
| Chân 26 | DB8 — Data bit 8 |
| Chân 27 | DB7 — Data bit 7 |
| Chân 28 | DB6 — Data bit 6 |
| Chân 29 | DB5 — Data bit 5 |
| Chân 30 | DB4 — Data bit 4 |
| Chân 31 | DB3 — Data bit 3 |
| Chân 32 | DB2 — Data bit 2 |
| Chân 33 | DB1 — Data bit 1 |
| Chân 34 | DB0 — Data bit 0 (LSB) |
| Chân 35 | DGND — Digital ground |
| Chân 36 | TAG — Tag/versioning pin |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | REFEN — Internal reference enable (active high) |
| Chân 46 | VA — Analog supply (+5V) |
| Chân 47 | AGND — Analog ground |
| Chân 48 | VA — Analog supply (+5V) |
Ứng dụng tiêu biểu
ADS8472IRGZR phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8472IRGZR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Drop-in B-grade INL upgrade path on the same footprint (vsADS8472IBRGZR)
- Lead-free G4 finish is fully RoHS compliant for green designs (vsADS8472IRGZRG4)
- Tape-and-reel packaging optimized for high-volume SMT lines (vsADS8472IBRGZTG4)
- Internal 4.096-V reference removes one external IC (vsExternal reference designs)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
