CDB6420 Cirrus Logic Inc, CDB6420 Datasheet - Page 32

• Manufacturer Part Number: CDB6420
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB6420

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: Speakerphone
• Kit Application Type: Audio / Video / TV
• Silicon Core Number: CS6420
• Kit Contents: Board
• Kit Features: Analog And Digital Patch Area
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

NI - Network Interface Input, Pin 17
Microcontroller Interface
RST - Active Low Reset Input, Pin 5
DRDY - Active Low Microcontroller Interface Data Ready Input, Pin 6
STROBE - Microcontroller Interface Clock Input, Pin 7
DATA - Microcontroller Interface Data Input, Pin 8
Clock
CLKI - Clock Oscillator Input, Pin 14
CLKO - Clock Oscillator Output, Pin 13
Power Supply
AVDD - Analog Supply, Pin 1
AGND - Analog Ground, Pin 2
DVDD - Digital Supply, Pin 16
DGND - Digital Ground, Pin 15
32
Input to the network side analog-to-digital converter (far-end input/receive input). This input
expects a single-pole RC anti-aliasing filter with a corner frequency of 8 kHz. Maximum signal
level before clipping at this point is 1 V
Analog Gain.
When RST is held low, the CS6420 is put into a low power mode with all functional blocks
idle. When RST goes high, the CS6420 is started in a known state.
DRDY is a low pulse used to gate valid input data into the Microcontroller Interface.
The rising edge of STROBE latches DATA into the Microcontroller Interface while DRDY is
low.
DATA is latched into the Microcontroller Interface on the rising edge of STROBE.
A 20.480 MHz parallel-resonant crystal should be connected between CLKI and CLKO.
Alternatively, CLKI may be driven directly with an 20.480 MHz CMOS level clock.
A 20.480 MHz parallel-resonant crystal should be connected between CLKI and CLKO. Must
be floating if CLKI is driven directly with a CMOS level clock.
+5 Volt analog power supply.
Analog ground reference.
+5 Volt digital power supply.
Digital ground reference.
rms
(2.8 V
pp
), assuming default settings for the Rx
CS6420
DS205PP2