ADS8284IRGCR - 18-Bit 1MSPS 4-Ch SAR ADC w/ PGA | TI
料号： ADS8284IRGCR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $27.5 | $27.50 |
| 10 | $24.85 | $248.50 |
| 100 | $22.1 | $2,210.00 |
| 500 | $19.5 | $9,750.00 |
| 1,000 | $17.25 | $17,250.00 |
ADS8284IRGCR 概述
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.
直接替换替代料： ADS8284IRGCR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS8284IRGCR （相同外形与封装尺寸） ——差异在于 Package, Input Type, Architecture, Resolution, Data Interface.
快速对比工具——选择替代料号进行并排对比：
ADS8284IBRGCR
✅ 直接替换📋 参考替代料（不在目录中）
ADS8284IRGCT
✅ 直接替换📋 参考替代料（不在目录中）
ADS8284IBRGCT
✅ 直接替换📋 参考替代料（不在目录中）
ADS8482IBRGZR
✅ 直接替换✓ 有现货
$14.45 / 个
查看数据手册 →ADS8481IRGZR
✅ 直接替换✓ 有现货
$8.1 / 个
查看数据手册 →ADS8472IRGZR
✅ 直接替换✓ 有现货
$8.5 / 个
查看数据手册 →ADS8284IRGCR 最大额定值与电气特性
| 分辨率 | 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 |
| 工作温度范围 | -40 C to +85 C |
| Temperature Grade | Industrial |
| 封装 | 64-pin VQFN (RGC), 9 mm x 9 mm |
| 安装类型 | Surface Mount |
| Lead-Free / RoHS | Yes (RoHS compliant) |
ADS8284IRGCR 64-pin vqfn (rgc), 9 mm x 9 mm 引脚配置指南
ADS8284IRGCR（64-pin vqfn (rgc), 9 mm x 9 mm 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： ADS8284IRGCR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADS8284IRGCR 适用于 7 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ADS8284IRGCR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Integrated 4-channel differential MUX plus PGA plus ADC plus reference in one IC （对比 ADS8481IRGZR)
- True 18-bit resolution vs 16-bit （对比 ADS8472IRGZR)
- Zero-latency SAR architecture simplifies closed-loop control （对比 ADS6422IRGC25)
设计说明
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.
合规信息
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.
