ADS8328IRSAR - 16-Bit 500kSPS 2-Channel SAR ADC | Texas Instruments
料号： ADS8328IRSAR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.45 | $54.50 |
| 100 | $4.6 | $460.00 |
| 500 | $4.1 | $2,050.00 |
| 1,000 | $3.65 | $3,650.00 |
ADS8328IRSAR 概述
An SAR ADC (successive-approximation-register analog-to-digital converter) is a sampled-data converter class that resolves N bits in N clock cycles by switching a binary-weighted capacitor DAC against the input. SAR ADCs occupy the middle ground between flash converters (fastest, lowest resolution) and sigma-delta (highest resolution, slowest). The ADS8328 belongs to the precision-signal-chain IC family, sitting under data converters (ADC/DAC) in the broader signal-chain taxonomy, with a single +5 V analog supply as its typical operating rail.
Key features include ±0.5 LSB typical INL and ±0.5 LSB typical DNL, a 2-to-1 input MUX with programmable TAG-bit output for channel identification, and 1.636 µs typical conversion time. The device also offers a flexible power-down state that reduces supply current to <1 µA between conversions, plus an offset-calibration command and an internal 20 MHz serial clock. The wide digital I/O range (1.65 V to 5.5 V) allows direct interfacing to 1.8 V, 3.3 V, and 5 V microcontrollers and DSPs without level shifters.
Architecturally, the ADS8328IRSAR uses a charge-redistribution capacitor DAC with inherent sample-and-hold, which preserves the input signal during the conversion window and supports takt-manager placement of the input capacitor on each channel. The 2:1 MUX and TAG bit allow multi-channel data acquisition on a single serial bus, while chain-mode operation lets up to 16 devices share one CS line for 32-channel systems.
Typical applications include portable industrial data loggers, multi-channel battery-pack monitors, optical-module photodiode readout, medical instrumentation signal chains, and precision sensor front ends. The wide analog supply tolerance makes it suitable for both 3.3 V and 5 V designs. When designing with this device, ensure adequate input bandwidth and use a low-impedance input buffer when driving from high-impedance sensors. The serial interface clock can be sourced from the host or generated by the ADC's internal oscillator.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ADS8328IRSAR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
ADS8328IRSARG4
✅ 直接替换📋 参考替代料（不在目录中）
ADS8327IRSAR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADS8328IRSATG4
✅ 直接替换📋 参考替代料（不在目录中）
ADS8328IRSAR 最大额定值与电气特性
| 分辨率 | 16 bits |
| Sample Rate | 500 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage | 2.7 V to 5.5 V |
| Digital I/O Supply Voltage | 1.65 V to 5.5 V |
| Input Channels | 2 (single-ended) / 1 (differential) |
| Conversion Time | 1.636 us (typ) |
| Power Consumption | 10 mW at 500 kSPS (typ) |
| Power-Down Current | <1 uA |
| 接口 | DSP / SPI / Frame-Sync Serial |
| 工作温度 | -40C to +85C |
| 封装 | 16-pin VQFN (RSA), exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
ADS8328IRSAR 引脚配置
| 引脚 1 | AVDD — Analog supply voltage (2.7 V to 5.5 V) |
| 引脚 2 | IN0 — Analog input channel 0 |
| 引脚 3 | IN1 — Analog input channel 1 |
| 引脚 4 | GND — Analog ground |
| 引脚 5 | REF — External reference voltage input |
| 引脚 6 | REFGND — Reference ground |
| 引脚 7 | CAP — Reference decoupling capacitor |
| 引脚 8 | GND — Digital ground |
| 引脚 9 | DVDD — Digital I/O supply voltage (1.65 V to 5.5 V) |
| 引脚 10 | CS — Chip select (active low) |
| 引脚 11 | SCLK — Serial clock input |
| 引脚 12 | DOUT — Serial data output |
| 引脚 13 | DIN — Serial data input (chain mode) |
| 引脚 14 | TAG — TAG bit enable / channel ID |
| 引脚 15 | CONVST — Conversion start input |
| 引脚 16 | EOC — End-of-conversion output |
典型应用
ADS8328IRSAR 适用于 7 应用s: Multi-Channel Battery Pack Monitor, Portable Industrial Data Logger, Optical Module Photodiode Readout, Medical Instrumentation Signal Chain, Precision Sensor Front End, Motor Control Position Feedback, Audio Bandwidth Signal Analyzer.
Multi-Channel Battery Pack Monitor
The ADS8328IRSAR is well-suited for multi-cell battery monitoring because its 2-to-1 input multiplexer allows sequential sampling of two cell voltages from a single ADC, while the 16-bit resolution captures coulomb-counting current-sense signals at 500 kSPS. The 2.7 V to 5.5 V analog supply matches a single Li-ion cell or a 3.3 V system rail, and the wide digital I/O range (1.65 V to 5.5 V) lets the ADC connect directly to a low-power MSP430 or Cortex-M0 host. The <1 uA power-down current between samples extends battery life, making it a strong fit for handheld battery analyzers and BMS front-ends.
推荐
Portable Industrial Data Logger
For portable industrial data loggers, the ADS8328IRSAR delivers 500 kSPS throughput and dual-channel sampling with chain-mode scalability to 32 channels from one SPI port. The serial interface accepts an external clock, synchronizing to the host MCU/DSP timer and avoiding the jitter of an internal oscillator. The VQFN-16 exposed pad package has low thermal resistance, allowing continuous 500 kSPS operation in sealed handheld enclosures with minimal copper pour. Combined with SPI host controllers, this ADC forms the core of multi-channel vibration, strain-gauge, and 4-20 mA loop data logging.
推荐
Optical Module Photodiode Readout
In fiber-optic receiver modules, the ADS8328IRSAR samples the photodiode transimpedance amplifier output at 500 kSPS, capturing both the DC average power and the AC modulation envelope for signal-quality monitoring. The 16-bit resolution preserves 80 dB of dynamic range, sufficient for 10G-class optical receiver AGC feedback loops. The compact VQFN-16 package fits inside SFP+ module cages, and the dual-channel input allows simultaneous sampling of the photodiode and a reference temperature-sensor voltage on a single ADC, eliminating the need for two separate converters.
推荐
Medical Instrumentation Signal Chain
In medical instrumentation, the ADS8328IRSAR delivers 16-bit precision at 500 kSPS, enabling digital acquisition of EEG, EMG, and ECG front-end signals after the instrumentation amplifier stage. The 2-to-1 MUX allows synchronized sampling of two electrode leads or a signal-plus-DRL path, while the SPI interface streams data directly to a host DSP for digital filtering. The -40C to +85C operating range covers clinical and laboratory environments, and the <1 uA power-down current keeps idle current low for battery-powered patient monitors.
推荐
Precision Sensor Front End
The ADS8328IRSAR is well-matched to precision sensor front ends such as load cells, strain gauges, and bridge-type pressure sensors when used after a low-noise instrumentation amplifier. The 16-bit resolution captures the full-scale bridge output with margin for offset and gain calibration, while the 500 kSPS rate exceeds typical mechanical-sensor bandwidths. The TAG-bit feature lets the host identify which of the two sensor channels produced each conversion result, simplifying firmware routing in multi-sensor arrays.
推荐
Motor Control Position Feedback
For BLDC and stepper motor control boards, the ADS8328IRSAR samples resolver/encoder position signals and current-shunt amplifier outputs at 500 kSPS, providing the digital feedback needed for field-oriented control loops. The dual input channels can capture both the motor-phase current and the DC-bus voltage on the same ADC with synchronized timing. The 2.7 V to 5.5 V analog supply operates from common 3.3 V or 5 V motor-drive rails, and the serial output interfaces to C2000 microcontrollers without level shifters.
推荐
Audio Bandwidth Signal Analyzer
In audio test-and-measurement instruments, the ADS8328IRSAR delivers full audio-bandwidth sampling (500 kSPS easily covers 96 kHz/192 kHz audio with headroom for anti-alias filtering). The 2-to-1 MUX lets a single ADC sample both left and right channels of a stereo line input, while the wide digital I/O range interfaces to 1.8 V or 3.3 V audio DSPs. Combined with a low-noise analog input stage, this ADC forms the core of a portable audio analyzer or USB sound-card measurement system.
推荐
推荐产品汇总
工程参考数据： ADS8328IRSAR ——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 | ADS8328IRSARG4 | ADS8328IRSATG4 | ADS8327IRSAR | AD7266BRUZ | AD7266BSUZ |
|---|---|---|---|---|---|---|
| Package | 16-VQFN (RSA) exposed pad | 16-VQFN (RSA) - same | 16-VQFN (RSA) - same | 16-VQFN (RSA) - same | 16-TSSOP - DIFFERENT, requires PCB rework | 16-TSSOP - DIFFERENT, requires PCB rework |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 2 MSPS | 2 MSPS |
| Input Channels | 2 (single-ended) / 1 (differential) | 2 (single-ended) / 1 (differential) | 2 (single-ended) / 1 (differential) | 1 (single-ended) | 2 differential or 3 single-ended | 2 differential or 3 single-ended |
| Analog Supply | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Digital I/O Supply | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| TAG Bit / Channel ID | Yes | Yes | Yes | No | No | No |
| Unit Price (qty 1, USD) | 6.10 | 6.10 (approx) | 6.10 (approx) | 5.50 (approx) | 7.80 (approx) | 9.20 (approx) |
关键差异点
- Wide digital I/O supply range eliminates level shifters （对比 AD7266BRUZ)
- Built-in TAG bit for multi-channel channel ID （对比 ADS8327IRSAR)
- Faster throughput than competing low-power 16-bit ADCs （对比 ADS1118)
- Chain-mode scalability to 32 channels on one SPI port （对比 AD7266BSUZ)
设计说明
Estimated thermal impedance for the VQFN-16 (RSA) package is approximately 36 C/W with the exposed pad soldered to a 1-square-inch copper pour on a 4-layer PCB. For continuous 500-kSPS operation at 5 V supply, ensure the analog ground and reference ground returns are tied together at a single point to avoid ground-loop noise. Place the 10 uF reference decoupling capacitor as close to the REF pin as possible, and add a 0.1 uF ceramic in parallel for high-frequency bypass.
The ADS8328IRSAR is sensitive to noisy digital returns on the analog ground plane. Keep digital lines (SCLK, CS, DOUT) routed on the opposite side of the PCB from IN0/IN1 traces, or use an inner ground layer between the two. Use a star-king capacitor topology where each digital line has its own series damping resistor at the driver end, and place the digital ground pour directly under the digital ICs. This protects the 16-bit conversion accuracy from switching-noise corruption of the analog inputs.
Do not drive IN0/IN1 directly from a high-impedance source; always buffer through a low-noise op-amp with <1 nA input bias current, otherwise signal-dependent input current will introduce channel-dependent offset. Avoid supplying DVDD from a switched regulator without filtering; the digital I/O supply noise will couple into the analog ground through package parasitics. Finally, when using chain mode, ensure the DIN trace is properly terminated to avoid double-clocking from reflections at high SCLK rates.
Estimated: at 5 V analog supply and 500 kSPS throughput, the ADC draws approximately 2 mA (10 mW). The internal reference circuit requires an additional 1 mA for stable output, so the total power-supply budget should allow at least 5 mA. Place a 10 uF tantalum + 0.1 uF ceramic decoupling network within 5 mm of the AVDD pin to handle the dynamic switching current at conversion start, otherwise the supply droop can corrupt mid-conversion samples.
合规信息
RoHS and REACH compliant per TI product folder. The G4 suffix (ADS8328IRSARG4) explicitly denotes Pb-free green terminal finish. AEC-Q100 not qualified for automotive - this part is intended for industrial, instrumentation, and consumer applications.
