ADS8284IRGCR - 18-Bit 1MSPS 4-Ch SAR ADC w/ PGA | TI
MPN: ADS8284IRGCR ✓ Hoạt độngADS8284IRGCR Tóm tắt
A SAR (successive-approximation-register) ADC is a type of Nyquist-rate converter that uses a binary-search algorithm and an internal DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs are valued for their deterministic latency, high accuracy, and lack of pipeline delay, sitting within the broader hierarchy of analog-to-digital converters (ADC) -> data converters -> mixed-signal ICs -> semiconductors. The ADS8284's pseudo-bipolar differential input architecture allows true differential signal acquisition with excellent common-mode rejection.
Key features include 18-bit resolution with no missing codes, 1 MSPS guaranteed throughput, on-chip 4-V internal reference, integrated programmable-gain amplifier (PGA) with gain settings up to 4, and 4-channel differential input multiplexer. The integrated driver and reference reduce external component count, while the parallel digital interface simplifies connection to FPGAs, DSPs, and microcontrollers. The QFN-64 package provides a compact footprint with an exposed thermal pad for heat dissipation.
Typical applications include industrial process control, multi-channel data acquisition systems, medical instrumentation, optical networking power monitoring, and high-precision multi-axis servo control. The 4-channel input multiplexer allows time-multiplexed acquisition of up to four differential signals per IC, reducing board space and BOM cost in multi-sensor systems.
Designers should pay close attention to PCB layout guidelines: route analog and digital grounds separately and join at a single point, place decoupling capacitors as close to the supply pins as possible, and use the exposed thermal pad for heat spreading. The on-chip reference requires an external bypass capacitor; refer to the datasheet for the recommended value.
This page synthesizes distributor pricing, drop-in replacement alternatives, and practical design notes not found in the manufacturer datasheet. Engineers searching for multi-channel 18-bit SAR ADC solutions will find the integrated PGA and multiplexer of the ADS8284IRGCR to be a compelling, board-space-saving alternative to discrete ADC + driver + MUX implementations.
Bộ thay thế dễ dàng lắp đặt cho ADS8284IRGCR — 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 ADS8284IRGCR (cùng hình factor và footprint) — khác nhau ở Package, Architecture, Input Type, Resolution, Sampling Rate.
ADS8284IBRGCR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8284IRGCT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8284IBRGCT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8482IBRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8481IRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8472IRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8284IRGCR Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 18 bits |
| Sample Rate | 1 MSPS |
| Number of Input Channels | 4 differential |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Pseudo-bipolar differential |
| Input Multiplexer | 4-channel |
| On-Chip ADC Driver | Yes (integrated OPA) |
| On-Chip Reference | 4 V internal |
| Digital Interface | Parallel |
| Latency | Zero latency at full throughput |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Temperature Grade | Industrial |
| Hộp | 64-pin VQFN (RGC), 9 mm x 9 mm |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Yes (RoHS compliant) |
Hướng dẫn cấu hình chân ADS8284IRGCR 64-pin vqfn (rgc), 9 mm x 9 mm
Cấu hình chân cho ADS8284IRGCR (64-pin vqfn (rgc), 9 mm x 9 mm gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho ADS8284IRGCR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ADS8284IRGCR phù hợp cho 7 Áp dụngs: Multi-Channel Industrial Data Acquisition, Medical Patient Monitoring Equipment, Precision Multi-Axis Servo Control, Optical Networking Power Monitoring, Automated Test Equipment (ATE), Power Quality and Energy Metering, Vibration and Acoustic Analysis.
Multi-Channel Industrial Data Acquisition
The ADS8284IRGCR's integrated 4-channel differential input multiplexer and 1 MSPS SAR throughput make it ideal for multi-channel industrial DAQ systems requiring simultaneous monitoring of multiple sensor inputs. Its 18-bit resolution captures process variables such as pressure, temperature, and strain with high accuracy, while the on-chip PGA simplifies signal conditioning for low-level transducer outputs. The integrated driver ensures settling accuracy at 1 MSPS, eliminating the need for an external op-amp that would otherwise add cost and board area.
Được đề xuất
Medical Patient Monitoring Equipment
The ADS8284IRGCR's 18-bit resolution and 4-channel MUX support patient monitoring devices that must digitize ECG, SpO2, temperature, and respiration signals with low noise. The integrated on-chip ADC driver provides the low-noise front-end required to resolve microvolt-level bioelectric signals, and the 1 MSPS throughput allows oversampling to improve effective resolution. The -40 C to +85 C industrial temperature range and RoHS compliance meet regulatory requirements for medical electronic equipment.
Được đề xuất
Precision Multi-Axis Servo Control
The ADS8284IRGCR's zero-latency SAR architecture is uniquely suited to multi-axis servo control loops where pipeline delay would compromise loop stability. Each of the four differential channels can monitor current or position feedback from one motor axis, and the deterministic 1 us conversion latency simplifies PID loop design. The 18-bit resolution provides 262,144 steps of feedback resolution, well below typical motor positioning accuracy requirements. The integrated PGA simplifies scaling of shunt-resistor current-sense signals to the ADC input range.
Được đề xuất
Optical Networking Power Monitoring
The ADS8284IRGCR's integrated 4-channel differential MUX enables optical networking systems to monitor four laser-bias or receiver-power signals with a single ADC. The 18-bit resolution detects sub-0.1 dB power variations needed for accurate optical loss measurement, and the 1 MSPS throughput is sufficient for typical photodiode bandwidths. The integrated on-chip ADC driver provides the low-noise transimpedance amplification needed for weak photodiode currents, while the parallel digital interface simplifies connection to network processors.
Được đề xuất
Automated Test Equipment (ATE)
The ADS8284IRGCR's combination of 18-bit resolution, 1 MSPS throughput, and 4-channel MUX makes it a strong fit for ATE pin-cards that must digitize multiple DUT parameters per test cycle. The integrated PGA allows per-channel gain scaling to accommodate signals of widely varying amplitudes. The zero-latency SAR architecture ensures deterministic test timing, which is critical for throughput-sensitive production ATE. The on-chip reference eliminates external reference drift concerns over the industrial temperature range.
Được đề xuất
Power Quality and Energy Metering
The ADS8284IRGCR's 4-channel differential MUX supports multi-phase power quality meters and energy meters that must digitize all phase voltages and currents simultaneously. The 18-bit resolution enables accurate true-RMS and harmonic-distortion measurement up to the 50th harmonic, and the 1 MSPS throughput satisfies IEC 62053-22 Class 0.2S accuracy class sampling requirements. The integrated on-chip ADC driver provides the isolation-amplifier signal conditioning needed for shunt- or CT-based current sensing.
Được đề xuất
Vibration and Acoustic Analysis
The ADS8284IRGCR's 1 MSPS throughput and 4-channel MUX suit vibration and acoustic analysis systems that digitize multiple accelerometer or microphone channels. The 18-bit resolution captures wide dynamic range signals, and the integrated PGA adapts to varying transducer output levels. The zero-latency SAR design preserves phase relationships across channels, which is essential for modal analysis and beamforming. The parallel digital interface feeds FPGAs that perform real-time FFT processing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8284IRGCR — 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 | ADS8284IBRGCR | ADS8284IRGCT | ADS8482IBRGZR | ADS8481IRGZR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-64 (RGC) 9x9 mm | VQFN-64 (RGC) 9x9 mm - same | VQFN-64 (RGC) 9x9 mm - same | VQFN-64 (RGZ) - same family | VQFN-64 (RGZ) - same family |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Input Channels | 4 differential | 4 differential | 4 differential | 1 differential (with PGA) | 1 pseudo-bipolar |
| On-Chip ADC Driver | Yes | Yes | Yes | Yes | Yes |
| On-Chip Reference | 4 V internal | 4 V internal | 4 V internal | 4.096 V internal | 4.096 V internal |
| Latency | Zero (SAR) | Zero (SAR) | Zero (SAR) | Zero (SAR) | Zero (SAR) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- Integrated 4-channel differential MUX plus PGA plus ADC plus reference in one IC (vsADS8481IRGZR)
- True 18-bit resolution vs 16-bit (vsADS8472IRGZR)
- Zero-latency SAR architecture simplifies closed-loop control (vsADS6422IRGC25)
Ghi chú thiết kế
Route analog and digital grounds on separate PCB layers and join them at a single point directly under the ADS8284IRGCR exposed thermal pad. The integrated ADC driver and SAR logic generate high-frequency digital transients on the digital ground; mixing them with analog ground return currents will couple noise into the analog input and degrade SNR. Use a solid ground plane on layer 2 directly under the device, with vias stitching the top-layer analog/digital grounds at the single-point connection. The 64-pin VQFN exposed pad must be soldered to a copper pour of at least 1 square inch for adequate heat spreading.
Place 10 uF X7R ceramic bypass capacitors as close as possible to each AVDD supply pin and a 0.1 uF NP0/C0G capacitor in parallel for high-frequency noise suppression. The integrated ADC driver's PSRR is finite, and a noisy supply will modulate the reference voltage and inject error into conversion results. Add a ferrite bead in series with the analog supply if switching regulators are used upstream. The on-chip 4 V reference also requires a 10 uF external bypass capacitor placed adjacent to the REFOUT pin to filter thermal noise. Estimated: based on typical 18-bit SAR ADC supply-noise sensitivity of approximately 1 LSB per 1 mV supply ripple.
Keep the analog input traces (AINP/AINN) short, symmetric, and guarded by analog ground traces to minimize common-mode noise pickup. Route the parallel digital bus (DB[17:0], BUSY, CONVST, RD, CS) away from the analog section, and use series damping resistors (22-33 ohm) at the digital output drivers if the bus runs more than 50 mm to the receiving FPGA. The CONVST and BUSY signals should be treated as critical timing traces; avoid routing them parallel to the analog inputs. Add a ground-fill keepout under the analog input traces to reduce parasitic capacitance.
Do not assume the input common-mode voltage is flexible; the integrated PGA's input range is constrained by the AVDD/AVSS rails. Exceeding the input common-mode range will saturate the PGA and produce incorrect conversion results. The on-chip reference is shared with the ADC core and cannot drive external loads; do not connect REFOUT to anything except the bypass capacitor. When using the 4-channel MUX, allow at least 1 us settling time after channel switching before initiating CONVST, or use the auto-scan mode specified in the datasheet.
Thông tin tuân thủ
RoHS and lead-free status per TI product page; not AEC-Q100 qualified - choose automotive-grade SAR ADCs from TI's automotive portfolio for vehicle applications.
