Cirrus Logic CRD42L51 User Manual
Crd42l51, Reference design for cs42l51, Features
Copyright
© Cirrus Logic, Inc. 2005
(All Rights Reserved)
Reference Design for CS42L51
Features
!
Ultra Small Layout
!
Single AAA Battery Source
!
1/8” Stereo Input Allows up to 2 Vrms Signals
!
On-Board MIC
!
1/8” Stereo Headphone Output Jack
!
S/PDIF Input (CS8416 Receiver)
!
Flexible User Interface
–
2 Pushbuttons Enable, Disable and
Navigate between Reset, Standby, Input
Source and Effects Options
–
2 Pushbuttons Adjust Volume and Effects
CRD42L51 Actual Size
Description
The CRD42L51 evaluation board provides a quick and
easy evaluation of select features in the CS42L51 Low
Power, Stereo CODEC. Four pushbuttons and sixteen
LED’s comprise the user interface, allowing manipula-
tion of the CS42L51’s registers and control clock/data
routing between the CODEC, crystal oscillator, and
S/PDIF Receiver.
Two 1/8” stereo jacks provide analog input and output
connections, and a S/PDIF optical receiver provides a
digital input connection. An on-board microphone dem-
onstrates the high dynamic range of the CS42L51’s
Programmable Gain Amplifier (PGA) and MIC pre-
amplifier.
Power is derived from a single AAA battery boosted up
to 3.3 V for the interface and control logic, then regulat-
ed down to 1.8 V for the CS42L51’s analog/digital core
and headphone supply.
The CRD42L51 highlights the ultra small layout re-
quired for the CS42L51. Required components include
only a few small ceramic capacitors and resistors.
ORDERING INFORMATION
CRD42L51
Reference Design
LED Selection
Indicators
Battery Clip
CS42L51
Microcontroller
1/8" Stereo Line
Input Jack
Omni-directional
Microphone
1/8" Stereo
Headphone Jack
Optical
Input Jack
Push Buttons
AAA
I²C Control/Reset
Clocks/Data
+3.3 V
12.2880 MHz
Oscillator
+1.8 V
Step Up DC-DC
Converter w/
Linear Reg.
Master Clock
CS8416
DECEMBER '05
DS679RD1
CRD42L51