ADC32RF83 datasheet(38/138 Pages) TI

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IQ 3 GSPS

N/2

ADC

NCO 2,

16 Bits

3 GSPS

IQ data, 3 GSPS

RX1 IQ Output

GPIO

SYSREF

RX2 IQ Output

NCO 1,

16 Bits

NCO 3,

16 Bits

NCO 4,

16 Bits

RX1 Real Output

Wideband IQ Output

2,3

Wideband Real Output

RX2 Real Output

JESD204B

fOUT / 4

LPF

N/2

LPF

IQ data

Real[ ]

IQ data

ADC32RF80, ADC32RF83

SBAS774A – MAY 2016 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: ADC32RF80 ADC32RF83

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8.3.4.2 Operating Mode: Wide-Bandwidth Observation Receiver

This mode is intended for using a DDC with a wide bandwidth output, but for multiple bands. This mode uses a

single DDC chain where up to three NCOs can be used to perform wide-bandwidth observation in a multi-band

environment, as shown in Figure 95. The three NCOs can be switched dynamically using either the GPIO pins or

an SPI command. All three NCOs operate continuously to ensure phase continuity; however, when the NCO is

switched, the output data are invalid until the decimation filters are completely flushed with data from the new

band.

NOTE: Red traces show SYSREF going to the NCO blocks.

Figure 95. Decimation Filter Implementation for Single-Band and Wide-Bandwidth Mode

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