MAX1228BEEP+TG002 - 12-Bit 300ksps ADC with FIFO | Analog Devices
料号： MAX1228BEEP+TG002 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.55 | $115.50 |
| 100 | $10.2 | $1,020.00 |
| 500 | $8.95 | $4,475.00 |
| 1,000 | $7.8 | $7,800.00 |
MAX1228BEEP+TG002 概述
A successive-approximation-register (SAR) ADC is a converter topology that uses a binary-weighted capacitor network and a comparator to digitize an analog input in N clock cycles for an N-bit result. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy - properties that make them ideal for multiplexed multi-channel applications, precision sensor readout, and industrial process control where a known sampling instant matters.
Key features include 12-bit resolution, 300 ksps sampling rate, internal 4.096 V reference, internal temperature sensor with -40C to +85C operating range, 6- or 12-channel single-ended or differential input multiplexer, on-chip FIFO for up to 16 conversions, AutoShutdown mode that drops supply current to under 1 microampere between samples, and a 20 MHz SPI/QSPI/MICROWIRE-compatible serial interface. The 20-pin QSOP footprint occupies 5.0 mm x 5.6 mm of board area for compact front-end modules.
The MAX1228 uses a charge-redistribution SAR core with input track-and-hold, with the analog inputs overdriven-tolerant to the supply rails. The internal reference is trimmed to within 1 percent accuracy and supports ratiometric measurements using an external REF. An internal temperature sensor exploits the proportional-to-absolute-temperature behavior of a bipolar transistor junction, allowing the host to perform cold-junction compensation or thermal monitoring with the same ADC front-end.
Typical applications include 4-20 mA industrial loop transmitters, multi-zone temperature monitoring, portable data loggers, PLC analog input modules, and medical patient-monitoring front ends. The internal FIFO eases host processor burden in real-time control loops.
When designing with this ADC, observe the input RC network recommended in the datasheet and place the 1 nF CIN and 10 nF REF bypass capacitors within 5 mm of their respective pins to preserve AC performance.
This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes not found in the bare manufacturer datasheet.
直接替换替代料： MAX1228BEEP+TG002 ——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： MAX1228BEEP+TG002 （相同外形与封装尺寸） ——差异在于 Architecture, FIFO Depth, Input Type.
快速对比工具——选择替代料号进行并排对比：
MAX1228BEEP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1228BEEP+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX1228AEEP+T
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.78 / 个
查看数据手册 →MAX1226EAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1227ECQ+TD
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1228BEEP+TG002 最大额定值与电气特性
| 分辨率 | 12 bit |
| 采样率 | 300 ksps |
| Number of Channels | 6 or 12 input (single-ended/differential) |
| Architecture | SAR (Successive Approximation Register) |
| 接口 | SPI/QSPI/MICROWIRE-compatible serial |
| Input Type | Differential, Single-Ended |
| Reference | Internal 4.096 V (External also supported) |
| Temperature Sensor | Internal |
| FIFO Depth | 16 conversions |
| Special Features | AutoShutdown, scan mode, internal averaging, internal clock |
| 电源电压 | 4.75 V to 5.25 V (single supply) |
| Analog Input Range | 0 V to VREF (unipolar) |
| 工作温度 | -40C to +85C |
| 封装 | 20-pin QSOP |
| 安装类型 | Surface Mount |
MAX1228BEEP+TG002 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 (single-ended positive or differential positive) |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 / AIN1- differential pair |
| 引脚 4 | AIN3 — Analog input channel 3 / AIN0- differential pair |
| 引脚 5 | AIN4 — Analog input channel 4 |
| 引脚 6 | AIN5 — Analog input channel 5 |
| 引脚 7 | REF — Reference voltage input/output (4.096 V internal) |
| 引脚 8 | GND — Ground |
| 引脚 9 | AVDD — Analog supply (4.75 V to 5.25 V) |
| 引脚 10 | DOUT — Serial data output (SPI MISO) |
| 引脚 11 | SSTRB — Serial strobe output (conversion complete flag) |
| 引脚 12 | DIN — Serial data input (SPI MOSI) |
| 引脚 13 | SCLK — Serial clock input |
| 引脚 14 | CS — Chip select (active low) |
| 引脚 15 | DVDD — Digital supply (internally derived) |
| 引脚 16 | DGND — Digital ground |
| 引脚 17 | AIN6 — Analog input channel 6 |
| 引脚 18 | AIN7 — Analog input channel 7 |
| 引脚 19 | AIN8 — Analog input channel 8 / AIN5- differential pair |
| 引脚 20 | AIN9 — Analog input channel 9 / AIN4- differential pair |
典型应用
MAX1228BEEP+TG002 适用于 6 应用s: Industrial 4-20 mA Loop Transmitter, Multi-Zone Temperature Monitoring System, Portable Data Logger Front-End, PLC Analog Input Module, Medical Patient Monitoring Front-End, Smart Sensor Hub with AutoShutdown.
Industrial 4-20 mA Loop Transmitter
The MAX1228BEEP+TG002's integrated 12-bit 300 ksps SAR ADC with internal reference and 6/12 input channels is well suited to multi-loop industrial 4-20 mA current-loop transmitter modules, where each channel digitizes a dedicated sensor input. The 4.096 V internal reference maps to a 1 mV per LSB code width, enabling sub-millivolt sensor readout. The AutoShutdown feature drops supply current between conversion bursts, an essential feature for loop-powered 4-20 mA transmitters with strict 3.5 mA quiescent budgets. The on-chip 16-conversion FIFO allows the host microcontroller to sleep for longer intervals, further easing loop-power dissipation in tightly budgeted two-wire transmitters.
推荐
Multi-Zone Temperature Monitoring System
The MAX1228BEEP+TG002's combination of an internal temperature sensor and 6/12 external analog inputs makes it well matched to multi-zone temperature monitoring systems covering cabinet hot-spots, battery cell stacks, and reflow oven zones. The internal sensor handles the board-local reference temperature while each external channel connects to a thermistor bridge or 4-wire RTD front-end, eliminating an external sensor IC. The 12-bit resolution yields approximately 1 degree C step size for typical 0 to 100 C monitoring spans, and the -40C to +85C operating range matches cold-storage and outdoor cabinet deployment. Real-time scan mode cycles through zones automatically at programmer-defined periods.
推荐
Portable Data Logger Front-End
The MAX1228BEEP+TG002 is an excellent fit for battery-powered portable data-logger designs where low quiescent current and multi-channel digitization are critical. AutoShutdown drops supply current below 1 microampere between conversions, while the on-chip FIFO buffers up to 16 conversions, so the host microcontroller wakes only when the FIFO threshold trips, substantially extending battery life. The 12-bit resolution and 4.096 V internal reference are well matched to 0-3.3 V sensor outputs such as those from MEMS accelerometers, environmental sensors, and strain-gauge bridges. The 20-pin QSOP package occupies only 5.0 mm x 5.6 mm of board area for compact wearable or handheld enclosures.
推荐
PLC Analog Input Module
The MAX1228BEEP+TG002 is well suited for Programmable Logic Controller (PLC) analog input modules requiring multi-channel digitization of 4-20 mA or 0-10 V field signals. The 6/12 input-channel multiplexer covers typical 4-channel or 8-channel PLC cards with a single ADC IC, reducing BOM cost per channel. The 300 ksps aggregate sampling rate is far higher than the few hundred samples per second demanded by closed-loop PLC control loops, leaving margin for simultaneous 50 Hz / 60 Hz line-frequency rejection through host-side digital filtering. The industrial -40C to +85C range covers standard factory-floor temperature specifications.
推荐
Medical Patient Monitoring Front-End
The MAX1228BEEP+TG002 supports medical patient-monitoring front-end designs where low noise, multi-channel analog readout, and IEC 60601-1 isolation boundary compliance matter. Each external channel can digitize ECG, SpO2, temperature, or respiration transducer outputs while the internal temperature sensor handles cold-junction compensation. The SAR architecture's deterministic latency simplifies the timing of measured vitals, and the 4.096 V internal reference delivers 1 mV LSB resolution adequate for diagnostic-grade medical sensing. The 5 V supply with internal LDO lets the design meet stringent patient-leakage requirements.
推荐
Smart Sensor Hub with AutoShutdown
The MAX1228BEEP+TG002 fits smart-sensor-hub designs that aggregate multiple analog sensors behind a small embedded host and require average power consumption below 1 milliwatt for energy-harvesting or battery-sustained operation. The AutoShutdown feature combined with the internal FIFO lets the host sleep for hundreds of milliseconds at a time between wake-cycled conversions, with system-level current consumption averaging below 200 microamperes at 1 VREF and 1 ksps aggregate sample rate. The 6/12 input channels let one IC replace separate dedicated ADCs for temperature, pressure, light, flow, and voltage monitoring channels, reducing hub BOM cost and board area.
推荐
推荐产品汇总
工程参考数据： MAX1228BEEP+TG002 ——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 | MAX1228BEEP+ | MAX1228BEEP+T | MAX1228AEEP+T | MAX1226EAP+ | MAX1227ECQ+TD |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Package | 20-pin QSOP | 20-pin QSOP - same | 20-pin QSOP - same | 20-pin QSOP - same | 20-pin SSOP - same footprint family | 20-pin QSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Input Channels | 6/12 single-ended/differential | 6/12 | 6/12 | 6/12 | 3/6 (lower) | 6/12 |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| AutoShutdown | Yes | Yes | Yes | Yes | Yes | Yes |
| FIFO Depth | 16 conversions | 16 | 16 | 16 | 16 | 16 |
关键差异点
- Internal temperature sensor integrated with 12-bit ADC （对比 MAX1068AEEG+)
- Internal FIFO with AutoShutdown for battery optimization （对比 MAX1162ACUB+)
- 12-bit 300 ksps aggregate throughput （对比 MAX1116EKA+)
设计说明
Place the 0.1 uF AVDD bypass capacitor within 5 mm of pin 9 and the 1 nF REF decoupling capacitor within 5 mm of pin 7. Use a star-ground topology tying AVDD, REF, and the analog input ground directly to a single low-impedance plane; otherwise reference noise couples into the conversion result.
Route the serial SPI lines (SCLK, DIN, DOUT, CS, SSTRB) as short as possible with a 33 ohm series-termination resistor at the host-driver end for bus lengths above 50 mm. Keep digital traces at least 3 mm away from AIN0..AIN5 and REF to minimize digital-to-analog crosstalk.
Do not apply analog input voltages more than 200 mV outside the AVDD/GND rails with the input still actively selected; overvolt can latch up the input ESD structure. To read negative voltages or signals exceeding the supply, condition through an external op-amp front-end (e.g. MAX44265) that limits the output swing to within AVDD/GND.
Use the AutoShutdown feature (SETUP register bit) to drop supply current below 1 uA between conversion bursts. In low-duty-cycle applications such as one-shot temperature or battery-cell monitoring every 500 ms, this reduces average supply current from ~1 mA to ~20 uA, extending coin-cell runtime significantly.
合规信息
RoHS status not present in the verified web snippet; mark as unknown rather than guess. AEC-Q100 not applicable for this non-automotive-qualified part per family documentation.
