CDB5530U Cirrus Logic Inc, CDB5530U Datasheet - Page 4

• Manufacturer Part Number: CDB5530U
• Description: BOARD EVAL FOR CS5530
• Manufacturer: Cirrus Logic Inc
• Type: A/Dr

Specifications of CDB5530U

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 3.84k
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±2.5 V
• Power (typ) @ Conditions: 35mW @ 5 V
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS5530
• Product: Data Conversion Development Tools
• Resolution: 24 bit
• Maximum Clock Frequency: 4 MHz
• Interface Type: USB
• Supply Voltage (max): 5 V
• Supply Voltage (min): 3.3 V
• For Use With/related Products: CS5530
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1158

1.2.2
Figure 2 illustrates the schematic of the digital section. It contains the microcontroller, USB interface, EE-
PROM, JTAG header, reset circuitry, and an external interface header. The microcontroller interfaces the
SPI
that the SCLK and SDI signals are level shifted to support both +3.3 V and +5 V digital operation.
The microcontroller EEPROM is used to store firmware. An external interface header, J19, is provided to
allow the CDB5530U to be interfaced with an external microcontroller. To use this serial interface, the
0 ohm resistors R9, R10, R23, and R27 should be removed to disconnect the on-board microcontroller
from the serial interface.
1.2.3
Figure 3 illustrates the power supply connections to the evaluation board. VA+ supplies the positive ana-
log supply for the CS5530 and the LT1019 reference. Header J14 allows the VA+ supply to be sourced
from either the VA+ binding post (J2), or from the +5 V binding post (J3). VA- supplies the negative analog
supply for the analog section. Header J13 allows the VA- supply to be sourced from either the VA- binding
post (J1), or connected to the board ground. Note that the VA- supply should be connected to ground
when powering the CDB5530U from a single +5 V analog supply. VD+ supplies the digital section of the
ADC and level shifters. Header J15 allows the VD+ supply to be sourced from the VD+ binding post (J5),
the +5 V binding post (J3), or the regulated +3.3 V supply derived from the microcontroller. The +5 V bind-
ing post supplies the microcontroller’s internal regulator.
4
Reference
Table 1. Voltage Reference Selection for VREF+
LT1019
VREF+
™
VA+
and MICROWIRE
Digital Section
Power Supply Section
LT1019 Reference
Reference Source
Selects on-Board
Selects External
Selects Positive
Analog Power
Description
(5ppm/
Supply
(J12)
°
C)
™
compatible serial port of the CS5530 with the USB connection to the PC. Note
LT1019
LT1019
LT1019
REF+
REF+
REF+
VA+
VA+
VA+
O
O
O
O
O
O
O
O
O
J17
O VREF+
O VREF+
O VREF+
O VREF+
O VREF+
O VREF+
O VREF+
O VREF+
O VREF+
Reference
Table 2. Voltage Reference Selection for VREF-
VREF-
GND
VA-
Reference Source
Selects Negative
Selects External
Analog Power
Selects Board
Description
Supply
(J12)
Gnd
REF-
REF-
REF-
GND
GND
GND
CDB5530U
VA-
VA-
VA-
O
O
O
O
O
O
O
O
O
J18
DS742DB1
O VREF-
O VREF-
O VREF-
O VREF-
O VREF-
O VREF-
O VREF-
O VREF-
O VREF-