AD7478ARTZ-REEL - 8-Bit 1 MSPS SAR ADC SOT-23-6 | Analog Devices
料号： AD7478ARTZ-REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.43 | $44.30 |
| 100 | $3.94 | $394.00 |
| 500 | $3.54 | $1,770.00 |
| 1,000 | $3.15 | $3,150.00 |
AD7478ARTZ-REEL 概述
An ADC (analog-to-digital converter) is a semiconductor device that converts a continuous-time analog voltage into a discrete digital code. Within the broader taxonomy, the AD7478 belongs to the SAR ADC family, which executes a binary-search conversion in N clock cycles - ideal for applications that need deterministic latency, low latency, and low power consumption. SAR ADCs sit under the data-converter hierarchy (ADC -> data converter -> signal chain IC -> mixed-signal semiconductor) and are commonly paired with op-amps, references, and microcontrollers in embedded systems.
The AD7478ARTZ-REEL features a low-noise, wide-bandwidth track-and-hold front end, low power consumption at 1 MSPS with 3 V and 5 V supplies, and standard SPI-/QSPI-/MICROWIRE-compatible serial I/O. Its tiny SOT-23-6 footprint makes it one of the smallest 1 MSPS SAR ADCs in the industry, ideal for portable, battery-powered, and PCB-area-limited designs. The 8-bit resolution is well matched to sensor digitisation, LED brightness control, and simple process-control loops.
Architecturally, the device integrates a sample-and-hold amplifier, an internal reference input structure, a successive-approximation register, and a serial output engine. Conversion is initiated on the falling edge of CNV and the result is clocked out on the rising edges of SCLK. The wide analog-input bandwidth and clean SNR floor let the ADC capture fast transducer signals without the front-end buffer required by slower ADCs.
Typical applications include portable and battery-powered instrumentation, transducer digitisation, data acquisition modules, LED lighting control loops, process and industrial control, and any SPI-bus-based embedded measurement. Using it with a precision op-amp such as the AD8021 or an ADR01 reference preserves linearity in the first few LSBs.
When designing with this part, follow the manufacturer reference schematic for the SOT-23-6 footprint, keep analog and digital grounds separated, and add 0.1 uF decoupling close to the AVDD pin. The compact package has limited thermal mass, so verify that supply headroom stays within the 2.35 V-5.25 V absolute-maximum envelope during transients.
This page synthesises Analog Devices datasheet parameters, current distributor stock and pricing, and drop-in alternatives not aggregated in any single place elsewhere.
直接替换替代料： AD7478ARTZ-REEL ——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： AD7478ARTZ-REEL （相同外形与封装尺寸） ——差异在于 Package, Resolution, Data Interface, Operating Temperature, Architecture.
快速对比工具——选择替代料号进行并排对比：
AD7478ARTZ-REEL7
✅ 直接替换📋 参考替代料（不在目录中）
AD7478ARTZ-500RL7
✅ 直接替换📋 参考替代料（不在目录中）
AD7476BRTZ-REEL
✅ 直接替换✓ 有现货
$2.85 / 个
查看数据手册 →AD7477SRTZ-REEL
✅ 直接替换✓ 有现货
$2.18 / 个
查看数据手册 →AD7478AAKSZ-REEL
✅ 直接替换✓ 有现货
$1.52 / 个
查看数据手册 →AD7478ARTZ-REEL 最大额定值与电气特性
| 分辨率 | 8 bits |
| Number of Channels | 1 single-ended input |
| Converter Type | SAR (Successive Approximation) |
| 采样率 | 1 MSPS |
| 电源电压 | 2.35 V to 5.25 V (single) |
| Input Bandwidth | >6 MHz (wide-bandwidth track-and-hold) |
| SNR | 70 dB at 100 kHz input |
| Digital Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| 封装 | SOT-23-6 (6-lead) |
| 安装类型 | Surface Mount |
| Throughput Type | 1 MSPS, single conversion per CNV |
| Power Consumption | Low power at 1 MSPS with 3 V / 5 V supplies |
| Packaging Type | Tape & Reel (REEL) |
| RoHS 状态 | Compliant |
AD7478ARTZ-REEL 引脚配置
| 引脚 1 | AVDD — Analog supply (2.35 V to 5.25 V); place 0.1 uF bypass capacitor close to this pin |
| 引脚 2 | SDOUT — Serial data output - conversion result clocked out MSB first |
| 引脚 3 | SCLK — Serial clock input for SPI/QSPI/MICROWIRE/DSP-compatible interface |
| 引脚 4 | GND — Ground return for analog and digital |
| 引脚 5 | CNV — Conversion start input - falling edge initiates conversion |
| 引脚 6 | AIN — Analog input - single-ended input to the track-and-hold |
典型应用
AD7478ARTZ-REEL 适用于 6 应用s: Portable Battery-Powered Instrumentation, Transducer and Sensor Digitisation, Data Acquisition Modules, LED Lighting Control Loops, Industrial Process Control (8-bit, 1 MSPS), Embedded Measurement Modules.
Portable Battery-Powered Instrumentation
The AD7478ARTZ-REEL is well matched to handheld battery-powered test instruments because it operates from a single 2.35 V to 5.25 V supply and consumes low power at 1 MSPS with both 3 V and 5 V rails. With 70 dB SNR at 100 kHz and a 6 MHz analog-input bandwidth track-and-hold, it captures transducer output without external buffering. Paired with an ADR01 reference and AD8021 op-amp, the ADC preserves 8-bit linearity in a palm-sized PCB area.
推荐
Transducer and Sensor Digitisation
Factory sensor signals (strain gauges, thermocouples after amplification, photodiodes, accelerometers) settle fast enough for the AD7478ARTZ-REEL's 1 MSPS conversion rate. The wide-bandwidth track-and-hold accepts >6 MHz analog inputs, simplifying the front-end filter design. SPI/QSPI/MICROWIRE-compatible serial output streams results directly to an MCU/DSP for closed-loop control. SOT-23-6 footprint fits even the smallest sensor-module PCBs.
推荐
Data Acquisition Modules
As the digital interface (SPI/QSPI/MICROWIRE/DSP-compatible) is shared by the whole AD7476/AD7477/AD7478 family, an 8-bit AD7478ARTZ-REEL module can stay in the BOM alongside higher-resolution channels. The same CNV, SCLK, SDOUT wiring reduces firmware complexity. The 1 MSPS throughput supports multiplexing many channels per second via an external analog MUX, while the wide input bandwidth catches transient events the S&H preserves without aliasing.
推荐
LED Lighting Control Loops
The AD7478ARTZ-REEL reads photodiode or thermistor analogue signals to drive LED brightness or colour-mixing loops. At 8-bit resolution, the device produces 256 PWM-grade steps which is adequate for many lighting dimming curves. Its single 2.35-5.25 V supply lets it share the LED driver's 3.3 V or 5 V rail, eliminating a separate ADC supply. SOT-23-6 minimises footprint inside smart-lamp PCBs.
推荐
Industrial Process Control (8-bit, 1 MSPS)
For 8-bit process-control loops - valve position, motor speed feedback, simple temperature readouts - the AD7478ARTZ-REEL gives a deterministic, low-latency conversion without the complexity of delta-sigma ADCs. The SAR architecture completes every conversion in fixed clock cycles, making control-loop timing predictable. The 2.35-5.25 V supply tolerance matches 3.3 V PLC backplanes and 5 V analogue I/O cards alike.
推荐
Embedded Measurement Modules
When an MCU/DSP lacks an internal ADC with the required speed, the AD7478ARTZ-REEL drops into SPI and adds 8-bit 1 MSPS capture capability. It avoids the MCU's internal ADC multiplexer and timing conflicts, freeing the CPU for measurement processing. The SOT-23-6 keeps board footprint under 10 mm squared, ideal for wearable fitness bands, environmental sensors, and IoT edge nodes. Pin-compatible upgrade path to AD7476 (12-bit) preserves layout silicon-de-risk.
推荐
推荐产品汇总
工程参考数据： AD7478ARTZ-REEL ——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 | AD7478ARTZ-REEL7 | AD7478ARTZ-500RL7 | AD7476BRTZ-REEL | AD7477SRTZ-REEL | AD7478AAKSZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOT-23-6 | SOT-23-6 (identical) | SOT-23-6 (identical) | SOT-23-6 (identical) | SOT-23-6 (identical) | SOT-23-6 (or alternate 6-lead) |
| Resolution | 8 bits | 8 bits | 8 bits | 12 bits | 10 bits | 8 bits (A-generation) |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Supply Voltage | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP |
| Input Bandwidth | >6 MHz | >6 MHz | >6 MHz | >6 MHz | >6 MHz | Improved TR/HF input |
| Reel Quantity | 10,000 (REEL) | 3,000 (REEL7) | 500 (500RL7) | 10,000 (REEL) | 10,000 (REEL) | 10,000 (REEL) |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Pin-compatible resolution upgrade path within same family （对比 AD7476BRTZ-REEL (12-bit) / AD7477SRTZ-REEL (10-bit))
- Industrial-defining SOT-23-6 miniature footprint for 1 MSPS （对比 AD7478AAKSZ-REEL)
- Multiple reel-packaging options within same SKU family （对比 AD7478ARTZ-REEL7 / AD7478ARTZ-500RL7)
设计说明
Place 0.1 uF X7R decoupling ceramic within 2 mm of the AVDD pin (pin 1). Separate analog and digital ground returns - tie them together only at a single point under the IC's GND pin. Keep the analog input trace to pin 6 short and routed away from digital signals (SCLK, CNV, SDOUT) to preserve the 70 dB SNR floor at 100 kHz.
Drive CNV and SCLK with clean CMOS-level signals (rise/fall times < 10 ns) to avoid spurious conversion starts. Place a small RC filter (10 ohm + 22 pF) on SCLK if the bus is longer than 50 mm. The wide-bandwidth track-and-hold (>6 MHz) keeps input bandwidth high but does not replace a proper front-end antialias filter.
Do not exceed the 7 V absolute maximum on AVDD, even during transient hot-plug events. Ensure reference decoupling (0.1 uF) is present if the internal reference path is used. Do not assume the ADC is a 'pure digital' device - the analog input pin AIN must be driven by a low-impedance op-amp output to keep below 0.5 LSB settling at full 1 MSPS throughput.
合规信息
The 'Z' suffix in AD7478ARTZ indicates lead-free, RoHS-compliant packaging per Analog Devices part number convention. AEC-Q100 not qualified - this part targets industrial and consumer, not automotive. Halogen-free status not explicitly listed in the verified data.
