Cirrus Logic CDB5581 - Manual (Page 4)

CDB5581
4 DS796DB3
1.1 Overview
The CDB5581 evaluation board has both analog and digital circuit sections. The analog section consists
of the CS5581 ADC, two analog input signal buffers, controlled through a multiplexer, that condition the
signal into the ADC, and a precision 4.096 V reference. The digital section consists of board operation
configuration control signals, reset circuitry, an SPI™ serial port, a jumper connection for initiating ADC
calibration, and an EEPROM for evaluation board identification.
The evaluation board operates from +2.5V, -2.5V, +3.3V and communicates through an SPI™ serial port.
Figure 1 illustrates the CDB5581 block diagram.
CS5581
M
U
X
VREF
4.096 V
XTAL
16 MHz
Communication/Control
Interface
Master/Slave
Serial Port
Digital Inputs
to ADC
Digital Outputs
from ADC
IN_A
IN_B
+2.5V GND -2.5V GND +3.3V GND
J8
J6
J7
CS3004
Single-ended
Analog Inputs
Figure 1. CDB5581 Block Diagram