Instruction Manual

CDB5374
20 DS862DB1
2.3 Digital Hardware
2.3.1 Digital Filter
The CS5376A quad digital filter performs filtering and decimation of four delta-sigma bit streams from the
CS5374 modulators. It also creates a delta-sigma bit stream output to create analog test signals in the
CS4373A test DAC.
The CS5376A requires several control signal inputs from the external system.
Configuration is completed through the SPI 1 port.
Data is collected through the SD port.
Control Signals Description
RESETz Reset input, active low
BOOT Microcontroller / EEPROM boot mode select
TIMEB Time Break input, rising edge triggered
CLK Master clock input, 32.768 MHz
SYNC Master synchronization input, rising edge triggered
SPI1 Signals Description
SSIz Serial chip select input, active low
SCK1 Serial clock input
MISO Master in / slave out serial data
MOSI Master out / slave in serial data
SINTz Serial acknowledge output, active low
SSOz Serial chip select output (unused on CDB5374)
SD Port Signals Description
SDTKI Token input to initiate an SD port transaction
SDRDYz Data ready acknowledge, active low
SDCLK Serial clock input
SDDAT Serial data output
SDTKO Token output (unused on CDB5374)