CDB5378
DS639DB4
23
Configuration and data collection are through the SPI port.
Modulator
∆Σ
data is input through the modulator interface, and test DAC
∆Σ
data is generated by the test
bit stream generator.
Amplifier, modulator and test DAC pin settings are controlled through the GPIO port.
2.3.1.1
Reset Options - BOOT, PLL
Immediately following the reset signal rising edge, the CS5378 digital filter latches the states of the
GPIO[4..6]:PLL[0..2] and GPIO7:BOOT pins. The reset states of the GPIO[4..6]:PLL[0..2] pins select the
master clock input frequency and type, while the reset state of the GPIO7:BOOT pin selects how the
CS5378 digital filter receives configuration data.
At reset the CS5378 digital filter GPIO pins default as inputs with weak pull-up resistors enabled. If left
floating, the GPIO state reads high at reset because of the internal pull-up resistor. A four-position DIP
switch on CDB5378 (S5) can connect 10k
Ω
pull-down resistors to the GPIO[4..6]:PLL[0..2] or
GPIO7:BOOT pins so they will read low at reset. Because the pin states are latched at reset, GPIO pins
can be programmed and used normally after reset without affecting the PLL and BOOT selections.
Detailed information about the PLL input clock and BOOT mode selections at reset can be found in the
CS5378 data sheet.
SPI1 Signals
Description
DRDYz
Data ready output, active low
SCK Serial
clock
MISO
Master in / slave out serial data
MOSI
Master out / slave in serial data
SS:EECSz
Serial chip select, active low
Modulator Signals
Description
MCLK
Modulator clock output
MSYNC Modulator
synchronization output
MDATA
Modulator delta-sigma data inputs
MFLAG
Modulator over-range flag inputs
TBSDATA
Test DAC delta-sigma data output
GPIO Signals
Description
GPIO[0]:MUX[0]
Amplifier input mux selection
GPIO[1..3]:MODE[0..2]
Test DAC mode selection
GPIO[4..6]:GAIN[0..2]
Amplifier gain / test DAC attenuation
GPIO[7]:MUX[1]
Amplifier input mux selection
Содержание CDB5378
Страница 58: ...CDB5378 58 DS639DB4 5 LAYER PLOTS ...
Страница 59: ...CDB5378 DS639DB4 59 ...
Страница 60: ...CDB5378 60 DS639DB4 ...
Страница 61: ...CDB5378 DS639DB4 61 ...
Страница 62: ...CDB5378 62 DS639DB4 ...
Страница 63: ...CDB5378 DS639DB4 63 ...
Страница 64: ...CDB5378 64 DS639DB4 6 SCHEMATICS ...
Страница 65: ...CDB5378 DS639DB4 65 ...
Страница 66: ...CDB5378 66 DS639DB4 ...
Страница 67: ...CDB5378 DS639DB4 67 ...
Страница 68: ...CDB5378 68 DS639DB4 ...
Страница 69: ...CDB5378 DS639DB4 69 ...
Страница 70: ...CDB5378 70 DS639DB4 ...
Страница 71: ...CDB5378 DS639DB4 71 ...
Страница 72: ...CDB5378 72 DS639DB4 ...
Страница 73: ...CDB5378 DS639DB4 73 ...