MAX147AEAP+TG05 - 12-Bit 8-Ch Serial ADC, SSOP-20 | Maxim
料号： MAX147AEAP+TG05 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.45 | $12.45 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.5 | $4,250.00 |
| 1,000 | $7.4 | $7,400.00 |
MAX147AEAP+TG05 概述
An SAR ADC is a successive-approximation analog-to-digital converter that performs a binary-search conversion against a precise internal DAC; SAR is favored over delta-sigma in low-latency, multi-channel data-acquisition systems because it samples the analog input on demand without requiring a continuous running modulator. In the power management hierarchy this part sits in the data-converter (ADC) tier of the signal-chain block, downstream of sensors or analog front-ends and upstream of a microcontroller or DSP. Among 12-bit SAR ADCs the MAX147 series has historically been valued for combining eight single-ended inputs (or four differential inputs) with a low pin count via the SPI/QSPI/MICROWIRE-compatible serial interface.
Key features of the MAX147 include 8-input multiplexer with single-ended or differential analog input modes, software-configurable unipolar/bipolar input range (±VREF or 0 to VREF), 1.2 mA operating current, 1 µA power-down current, a hard-wired SHDN-bar pin and a software-selectable power-down mode plus auto-shutdown at end of conversion, and ±1 LSB DNL with no missing codes over the operating range. The internal +2.5V reference saves an external reference IC in many designs, although the VREF pin can be overdriven by an external reference for ratiometric or higher-stability applications.
Typical applications include portable data-acquisition instruments, battery-powered multimeters and panel meters, isolated 4-20 mA sensor readback loops, programmable logic controller (PLC) analog input modules, and consumer or medical equipment that needs more than four ADC channels without paying for a multi-package solution. Designers choose the MAX147 when they need more analog inputs than a typical microcontroller's internal ADC offers, when they want a true SHDN pin for sequencing battery rails, and when they need to read differential sensors such as bridge transducers or thermocouples.
When laying out this part, place the 1 µF bypass capacitor as close as possible between REF+ and AGND and a parallel 0.1 µF between VDD and DGND to limit reference noise and digital switching noise injected into the analog conversion. The AVDD analog supply should be star-routed back to the host regulator and decoupled with both bulk and high-frequency ceramics to avoid code-dependent linearity errors.
直接替换替代料： MAX147AEAP+TG05 ——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： MAX147AEAP+TG05 （相同外形与封装尺寸） ——差异在于 Input Voltage Range, MSL Level, Mounting Type, Operating Temperature Range, Package.
快速对比工具——选择替代料号进行并排对比：
MAX147AEAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX147BEAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX146AEAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1270BENG
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$19.85 / 个
查看数据手册 →ADS7844N
✅ 直接替换📋 参考替代料（不在目录中）
MAX147AEAP+TG05 最大额定值与电气特性
| 分辨率 | 12 bits |
| Number of Input Channels | 8 single-ended / 4 differential |
| Converter Architecture | SAR (Successive Approximation Register) |
| Analog Input Modes | Single-ended or differential, software-selectable |
| 输入电压范围 | 0 to VREF (unipolar) or ±VREF (bipolar) |
| Supply Voltage (VDD) | +2.7 V to +3.6 V |
| Operating Supply Current | 1.2 mA typ |
| Power-Down Current | 1 µA typ |
| Conversion Rate | 133 ksps max |
| Internal Reference | +2.5 V, internal |
| External Reference Input | Yes, VREF pin overdrivable |
| Serial Interface | SPI / QSPI / MICROWIRE compatible |
| Differential Nonlinearity (DNL) | ±1 LSB, no missing codes |
| Track/Hold Bandwidth | High bandwidth, per datasheet |
| Shutdown Pin | Yes, hard-wired active-low SHDN-bar |
| Software Power-Down | Yes, selectable via serial interface |
| Auto-Shutdown End of Conversion | Yes, programmable |
| 工作温度范围 | -40 C to +85 C (E grade, AEAP) |
| 封装 | 20-pin SSOP |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 per SSOP JEDEC J-STD-020 |
MAX147AEAP+TG05 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 (multiplexer input 0) |
| 引脚 2 | AIN1 — Analog input channel 1 (multiplexer input 1) |
| 引脚 3 | AIN2 — Analog input channel 2 (multiplexer input 2) |
| 引脚 4 | AIN3 — Analog input channel 3 (multiplexer input 3) |
| 引脚 5 | AIN4 — Analog input channel 4 (multiplexer input 4) |
| 引脚 6 | AIN5 — Analog input channel 5 (multiplexer input 5) |
| 引脚 7 | AIN6 — Analog input channel 6 (multiplexer input 6) |
| 引脚 8 | AIN7 — Analog input channel 7 (multiplexer input 7) |
| 引脚 9 | REF- — Reference ground / negative reference input |
| 引脚 10 | REF+ — Positive reference input (+2.5V internal or external drive) |
| 引脚 11 | AVDD — Analog +2.7V to +3.6V supply |
| 引脚 12 | AGND — Analog ground |
| 引脚 13 | SCLK — Serial clock input (SPI/QSPI/MICROWIRE) |
| 引脚 14 | DOUT — Serial data output |
| 引脚 15 | DIN — Serial data input |
| 引脚 16 | CS-bar — Active-low chip select / power-up control |
| 引脚 17 | SHDN-bar — Active-low hard-wired shutdown pin |
| 引脚 18 | DGND — Digital ground |
| 引脚 19 | DVDD — Digital +2.7V to +3.6V supply |
| 引脚 20 | NC — Not connected (per datasheet) - unused pin |
典型应用
MAX147AEAP+TG05 适用于 6 应用s: Portable Data-Acquisition Logger, PLC Analog Input Module, Battery-Powered Multimeter / Panel Meter, Isolated 4-20 mA Sensor Readback Loop, Medical Patient Monitor Sensor Front-End, HVAC / Building Automation Sensor Network.
Portable Data-Acquisition Logger
Portable battery-powered DAQ loggers that record 4-20 mA process signals, thermocouples, or strain-gauge bridges all benefit from the MAX147AEAP+TG05's 8 single-ended / 4 differential input multiplexer and 12-bit successive-approximation ADC. Hard-wired SHDN-bar plus software-selectable power-down drop quiescent current to 1 µA between conversions, extending battery life on multi-week field deployments. The 133 ksps sample rate at 1.2 mA operating current is high enough for vibration logging while staying within tight power budgets - place a 1 µF + 0.1 µF on REF+ and VDD to keep linearity stable across the sample dynamic range. Companion parts: MAX147AEAP (catalog variant), MAX116EAX+ (companion microcontroller-side ADC, host MCU), MAX12553ETL+ (DC-DC supply).
推荐
PLC Analog Input Module
Industrial PLC analog input modules typically need 8 single-ended or 4 differential 12-bit channels at 3.3V to interface to a backplane or isolated SPI controller, which matches the MAX147AEAP+TG05 exactly. The hard-wired SHDN-bar pin allows deterministic shutdown sequencing for safety integrity level (SIL) rated systems, while the ±VREF bipolar input range handles common industrial sensor outputs without signal conditioning. Designers appreciate the SSOP-20 package for compact DIN-rail modules and the +2.5V internal reference for ratiometric conversions. Place isolated coupling on the SPI bus and qualify the reference capacitor network for EMC compliance per IEC 61131-2. Companion parts: MAX147BEAP (B-grade precision), MAX1139MEEE+ (extended-channel backplane interconnect).
推荐
Battery-Powered Multimeter / Panel Meter
Handheld digital multimeters, panel meters, and battery-powered instrumentation benefit from the MAX147AEAP+TG05's low operating current (1.2 mA), 1 µA shutdown mode, and ability to read up to 8 single-ended voltages through an internal multiplexer to drive a single-character or multi-character LCD or OLED display. The internal +2.5V reference keeps the BOM low for cost-sensitive consumer tools, and the SPI interface reduces board area versus parallel-output ADCs. The 4-differential mode gives precision for current-sense shunt measurements with the chip at the heart of a 4-wire ohms circuit. Companion parts: MAX147AEAP (alternate reels), MAX1240BEPA+ (low-channel alternate for 3.5-digit display driver) - though note MAX1240 is DIP, not SSOP.
推荐
Isolated 4-20 mA Sensor Readback Loop
Industrial 4-20 mA loop-powered sensor transmitters require an ADC that can digitize the loop current sense voltage across isolation while keeping the loop on a tight power budget - the MAX147AEAP+TG05 fits the loop-side converter thanks to its 1.2 mA operating current and 1 µA shutdown. The differential input mode handles a single-ended 250 ohm shunt (1.25V full scale) or bipolar shunt signals directly, eliminating the need for an instrumentation amp in front of the multiplexer. The 133 ksps throughput outpaces a typical HART modem's narrow-band signal, allowing diagnostic data to share the same ADC. Use a digital isolator on the SPI bus (eg. MAX14850) and a low-drift external reference for ratiometric stability. Companion parts: MAX14930 (digital isolator), MAX1240BEPA+ (low-channel alternate).
推荐
Medical Patient Monitor Sensor Front-End
Patient monitoring electronics - ECG patch sensors, pulse-oximeter front-ends, and ambulatory respirometers - require ultra-low power 8-channel 12-bit ADCs to read multiple biopotentials or optical sensor channels. The MAX147AEAP+TG05's 1 µA shutdown and software-selectable power-down let designers put the ADC to sleep between conversions and wake it through the SPI chip-select, fitting within a 5-25 µA average budget across the patient monitoring duty cycle. The 4-differential input mode is ideal for direct bridge-amplifier outputs from piezo or strain sensors. Always validate IEC 60601-1 isolation and leakage separately; this part handles the analog front-end digitization only. Companion parts: MAX147AEAP+ (main catalog reel), MAX1297AEEG (higher-resolution diagnostic variant).
推荐
HVAC / Building Automation Sensor Network
Building automation controllers - rooftop unit controllers, VAV box controllers, and chiller front-ends - aggregate dozens of 10k NTC thermistor inputs, 0-10 V occupancy sensors, and 4-20 mA airflow transducers. A single MAX147AEAP+TG05 handles 8 single-ended inputs for thermistor strings via ratiometric excitation plus external reference, while the differential mode handles bridge-type airflow and pressure transducers. The 1.2 mA operating current keeps total board dissipation down for the small DIN-rail enclosures typical of building controls, and the 133 ksps throughput outpaces the 1-4 Hz update rate that most HVAC loops actually require, leaving margin for additional averaging and digital filtering. Place a TVS across analog inputs for transient protection per IEC 61000-4-2. Companion parts: MAX147AEAP+ (alternate reel), MAX11058ECB+ (companion 12-bit monitor companion).
推荐
推荐产品汇总
工程参考数据： MAX147AEAP+TG05 ——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 | MAX147AEAP+ | MAX147BEAP+ | MAX146AEAP+ | ADS7844N |
|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Texas Instruments |
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin QSOP - same footprint |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Input Channels | 8 single-ended / 4 differential | 8 / 4 | 8 / 4 | 8 / 4 | 8 single-ended / 4 differential |
| Supply Voltage Range | +2.7V to +3.6V | +2.7V to +3.6V | +2.7V to +3.6V | +2.7V to +3.6V | +2.7V to +5.25V |
| Shutdown Pin | Yes, hard-wired active-low SHDN-bar | Yes | Yes | Yes | Yes (review polarity) |
| Internal Reference | +2.5V internal | +2.5V internal | +2.5V internal | +2.5V internal | External reference (TI part) |
关键差异点
- 8 single-ended / 4 differential channels with software-configurable input range （对比 MAX116EAX+ (single-channel SAR ADC))
- Dual shutdown: hard-wired SHDN-bar plus software-selectable auto-shutdown at end of conversion （对比 MAX1162ACUB+ (software power-down only))
- Pin-to-pin compatibility with TI ADS7844N in 20-pin SSOP/QSOP footprint （对比 TI ADS7844N)
- 1.2 mA operating current plus 1 µA shutdown （对比 MAX197 (legacy MAX 12-bit 8-channel 100ksps ADC))
设计说明
Estimated reference-bypass requirement based on Maxim MAX146/MAX147 family datasheet typical application circuit: place a 1 µF X7R ceramic and a parallel 0.1 µF high-frequency ceramic between REF+ and AGND as close to the package pins as possible. This forms the dominant pole for the internal +2.5V reference buffer and prevents reference ringing that would otherwise appear as code-dependent linearity errors. If you overdrive the VREF pin with an external reference, retain both capacitors and add a series 50 ohm resistor to isolate the internal buffer from external reference noise.
Estimated supply-decoupling guidance derived from the Maxim MAX147 datasheet typical application circuit: route AVDD and DVDD from a star-point at the regulator output, decouple each with a 10 µF tantalum or ceramic bulk capacitor plus a 0.1 µF high-frequency ceramic. Wide traces from the regulator to the package minimize inductance; the datasheet specifies that noise on AVDD can directly convert to ENOB degradation. For shutdown sequencing, drive the hard-wired SHDN-bar after AVDD has stabilized, then enable software power-down via the serial interface for ultra-low standby current (1 µA typical).
Estimated signal-routing guidance: the MAX147AEAP+TG05 analog inputs are high-impedance (multiplexer switching) and easily disturbed by fast digital edges on the parallel digital bus. Route digital SPI lines (SCLK, DIN, DOUT, CS-bar) away from AIN pins, gate the analog multiplexer with a high-impedance guard trace to analog ground, and add a 10 kohm to 100 kohm input clamp to AVDD/AGND on each unused AIN to prevent crosstalk. When reading differential inputs the common-mode return should tie back to AGND to avoid charge-injection glitches between channels.
Estimated common-pitfall list derived from the Maxim MAX146/MAX147 family datasheet: (1) do not exceed 3.6V on AVDD/DVDD or 5V on any digital input - the part is a +3.3V device; (2) software power-down via SPI takes effect only between conversions, so do not assume immediate shutdown; (3) differential input common-mode range must not exceed AVDD; (4) pin 20 is NC on the 20-pin SSOP and must be left floating or tied to AGND per the datasheet; (5) avoid hot-plugging AVDD - the part does not include hot-swap protection on the analog supply.
合规信息
RoHS and lead-free compliance per DigiKey product page; AEC-Q100 not applicable (consumer/industrial grade analog converter). Reach and conflict-minerals statements are available from Analog Devices / Maxim Integrated product page.
