一文詳解Maxim MAX1240低功耗12位模數(shù)轉(zhuǎn)換器(ADC)解決方案

Maxim公司的MAX1240/MAX1241是低功耗12位模數(shù)轉(zhuǎn)換器(ADC),8引腳封裝, MAX1240工作電壓+2.7V到+3.6V,內(nèi)部基準(zhǔn)電壓2.5V;MAX1241工作電壓2.7V-5.25V.12位分辨率, SPI/QSPI/MICROWIRE三線串行接口,主要用在電池供電的系統(tǒng),手持?jǐn)?shù)據(jù)記錄和隔離數(shù)據(jù)采集,過程控制和儀表.本文介紹了MAX1240/MAX1241主要特性,框圖,以及評(píng)估板MAX1240 EVK主要特性,材料清單和PCB設(shè)計(jì)圖.

The MAX1240/MAX1241 low-power, 12-bit analog-to digital converters (ADCs) are available in 8-pin packages.

The MAX1240 operates with a single +2.7V to +3.6V supply, and the MAX1241 operates with a single +2.7V to +5.25V supply. Both devices feature a 7.5μs successive-approximation ADC, a fast track/hold (1.5μs), an on-chip clock, and a high-speed, 3-wire serial interface.

Power consumption is only 37mW (VDD = 3V) at the 73ksps maximum sampling speed. A 2μA shutdown mode reduces power at slower throughput rates.

The MAX1240 has an internal 2.5V reference, while the MAX1241 requires an external reference. The MAX1241 accepts signals from 0V to VREF, and the reference input range includes the positive supply rail. An external clock accesses data from the 3-wire interface, which connects directly to standard microcontroller I/O ports. The interface is compatible with SPI?, QSPI?, and MICROWIRE?.

Excellent AC characteristics and very low power combined with ease of use and small package size make these converters ideal for remote-sensor and data acquisition applications, or for other circuits with demanding power consumption and space requirements.

The MAX1240/MAX1241 are available in 8-pin PDIP and SO packages.

MAX1240/MAX1241主要特性:

? Single-Supply Operation:

+2.7V to +3.6V (MAX1240)

+2.7V to +5.25V (MAX1241)

? 12-Bit Resolution

? Internal 2.5V Reference (MAX1240)

? Small Footprint: 8-Pin PDIP/SO Packages

? Low Power: 3.7μW (73ksps, MAX1240)

3mW (73ksps, MAX1241)

66μW (1ksps, MAX1241)

5μW (power-down mode)

? Internal Track/Hold

? SPI/QSPI/MICROWIRE 3-Wire Serial Interface

? Internal Clock

MAX1240/MAX1241應(yīng)用:

Battery-Powered Systems

Portable Data Logging

Isolated Data Acquisition

Process Control

Instrumentation

圖1. MAX1240/MAX1241功能框圖

評(píng)估板MAX1240 EVK

The MAX1240 evaluation kit (EV kit) demonstrates the MAX1240, low-power, 12-bit serial ADC. The MAX1240 peripheral module (Pmod?) and the USB2PMB2 module form a system, the MAX1240 EV kit. Windows XP, and Windows? 7/8/8.1/10-compatible software provides a user friendly interface that demonstrates features of the MAX1240.

The MAX1240 peripheral module comes installed with the 8-pin SO package, MAX1240ACSA++.

評(píng)估板MAX1240 EVK主要特性:

6-Pin PMod-Compatible Connector SPI)

On-Board Voltage Reference (MAX6126)

Proven PCB Layout

Fully Assembled and Tested

Windows XP, Windows 7/8/8.1/10-Compatible Software

圖2. 評(píng)估板MAX1240 EVK外形圖

圖3. 評(píng)估板MAX1240 EVK電路圖

評(píng)估板MAX1240 EVK材料清單:

圖4. 評(píng)估板MAX1240 EVK PCB設(shè)計(jì)圖(1):左:頂層絲印;右:頂層

圖5. 評(píng)估板MAX1240 EVK PCB設(shè)計(jì)圖(2):層2

圖6. 評(píng)估板MAX1240 EVK PCB設(shè)計(jì)圖(3):左:層3;右:底層