ADS7844N屬于集成電路（IC）的模數(shù)轉(zhuǎn)換器（ADC）。由美國德州儀器公司制造生產(chǎn)的ADS7844N模數(shù)轉(zhuǎn)換器（ADC）模數(shù)轉(zhuǎn)換器（ADC、A/D 或 A 轉(zhuǎn) D）對(duì)模擬信號(hào)進(jìn)行采樣，例如由麥克風(fēng)采集的聲音或傳感器的輸出，然后將其轉(zhuǎn)換為數(shù)字信號(hào)。一般來說，數(shù)字輸出是二進(jìn)制補(bǔ)碼二進(jìn)制數(shù)，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數(shù)轉(zhuǎn)換器可按照位數(shù)、采樣率、輸入數(shù)、接口、轉(zhuǎn)換器數(shù)和架構(gòu)（例如自適應(yīng)增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進(jìn)行選擇。

FEATURES

SINGLE SUPPLY: 2.7V to 5V

8-CHANNEL SINGLE-ENDED OR

4-CHANNEL DIFFERENTIAL INPUT

UP TO 200kHz CONVERSION RATE

±1 LSB MAX INL AND DNL

NO MISSING CODES

72dB SINAD

SERIAL INTERFACE

20-LEAD QSOP AND

20-LEAD SSOP PACKAGES

ALTERNATE SOURCE FOR MAX147

APPLICATIONS

DATA ACQUISITION

TEST AND MEASUREMENT

INDUSTRIAL PROCESS CONTROL

PERSONAL DIGITAL ASSISTANTS

BATTERY-POWERED SYSTEMS

DESCRIPTION

The ADS7844 is an 8-channel, 12-bit sampling analog-todigital

converter (ADC) with a synchronous serial interface.

Typical power dissipation is 3mW at a 200kHz throughput

rate and a +5V supply. The reference voltage (VREF) can be

varied between 100mV and VCC, providing a corresponding

input voltage range of 0V to VREF. The device includes a

shutdown mode that reduces power dissipation to under

1μW. The ADS7844 is ensured down to 2.7V operation.

Low power, high speed, and onboard multiplexer make the

ADS7844 ideal for battery-operated systems such as personal

digital assistants, portable multichannel data loggers, and

measurement equipment. The serial interface also provides

low-cost isolation for remote data acquisition. The ADS7844

is available in a 20-lead QSOP package and the MAX147

equivalent 20-lead SSOP package and is ensured over the

–40°C to +85°C temperature range.