ADC3541 datasheet(26/68 Pages) TI1

tên linh kiện	ADC3541

Giải thích chi tiết về linh kiện	ADC354x 14-bit, 10-MSPS to 65-MSPS, Low-noise, Ultra-low Power ADC

PDF	68 Pages

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nhà sản xuất	TI1 [Texas Instruments]

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7.3.4 Digital Down Converter

The ADC354x includes an optional on-chip digital down conversion (DDC) decimation filter that can be enabled

via SPI register setting. It supports complex decimation by 2, 4, 8, 16 and 32 using a digital mixer and a 32-bit

numerically controlled oscillator (NCO) as shown in Figure 7-17. Furthermore it supports a mode with real

decimation where the complex mixer is bypassed (NCO should be set to 0 for lowest power consumption) and

the digital filter acts as a low pass filter.

Internally the decimation filter calculations are performed with a 20-bit resolution in order to avoid any SNR

degradation due to quantization noise. The output formatter (Section 7.3.5.4) truncates to the selected resolution

prior to outputting the data on the digital interface.

ADC

Filter

SYNC

NCO

32bit

Digital

Interface

Figure 7-17. Internal Digital Decimation Filter

ADC3541

SBAS840 – JULY 2020

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ADC3541 bảng dữ liệu(PDF) 26 Page - Texas Instruments