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ADC3541 Datasheet(PDF) 26 Page - Texas Instruments

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Part # ADC3541
Description  ADC354x 14-bit, 10-MSPS to 65-MSPS, Low-noise, Ultra-low Power ADC
PDF  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADC3541 Datasheet(HTML) 26 Page - 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
I
SYNC
NCO
32bit
Digital
Interface
I
N
Q
Q
Figure 7-17. Internal Digital Decimation Filter
ADC3541
SBAS840 – JULY 2020
www.ti.com
26
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