ADSP-BF523C AD [Analog Devices], ADSP-BF523C Datasheet - Page 4

• Manufacturer Part Number: ADSP-BF523C
• Description: Blackfin Embedded Processor 289-ball MBGA package
• Manufacturer: AD [Analog Devices]

ADSP-BF523C/ADSP-BF525C/ADSP-BF527C
The device is controlled by a TWI or SPI serial interface which
provides access to all features including volume controls, mutes
and extensive power management facilities.
The CODEC is designed specifically for portable audio prod-
ucts. Its features, performance and low power consumption
make it ideal for portable MP3 players and portable mini-disc
players.
The CODEC includes line and microphone inputs to the on-
board ADC, line and headphone outputs from the on-board
DAC, a crystal oscillator, configurable digital audio interface
and a choice of two or three wire control interface.
The CODEC includes three low noise inputs—a monaural
microphone and left and right stereo lines. Line inputs have +12
dB to –34 dB logarithmic volume level adjustments and mute.
The microphone input has –6 dB to +34 dB volume level adjust-
ment. An electret microphone bias level is also available. All the
required input filtering is contained within the device with no
external components required.
The on-board stereo analog-to-digital converter (ADC) uses a
high-quality multi-bit high-order oversampling architecture to
deliver optimum performance with low power consumption.
The output from the ADC is available on the digital audio inter-
face. The ADC includes an optional digital high pass filter to
remove unwanted dc components from the audio signal.
MICBIAS
RLINEIN
LLINEIN
AGND
AVDD
MICIN
VMID
OSCPD
OSC
XTO
VOLUME
VOLUME
MIC
BOOST
CLKIN
DIVIDER
MUTE
MUTE
MUTE
MUTE
MUX
MUX
CLKOUT
DIVIDER
Rev. PrC | Page 4 of 44 | June 2008
Figure 1. Audio CODEC Block Diagram
ADC
ADC
CSB
DIGITAL AUDIO INTERFACE
CONTROL INTERFACE
CSDA
DIGITAL
FILTERS
CSCL CMODE
The on-board digital-to-analog converter (DAC) accepts digital
audio from the digital audio interface. Digital filter de-emphasis
at 32 kHz, 44.1 kHz and 48 kHz can be applied to the digital data
under software control. The DAC uses a high quality multi-bit
high-order oversampling architecture to deliver optimum per-
formance with low power consumption.
The DAC outputs, microphone (SIDETONE) and line inputs
(BYPASS) are available both at line level and through a head-
phone amplifier capable of efficiently driving low impedance
headphones. The headphone output volume is adjustable in the
analog domain over a range of +6 dB to –73 dB and can be
muted.
The design of the CODEC has given much attention to power
consumption without compromising performance. It includes
the ability to power off selective parts of the circuitry under soft-
ware control, thus conserving power. Nine separate power
saving modes can be configured under software control includ-
ing a standby and power-off mode.
Special techniques allow the audio to be muted and the device
safely placed into standby, sections of the device powered off
and volume levels adjusted without any audible clicks, pops or
DAC
DAC
MUTE
ATTEN/
MUTE
MUTE
MUTE
ATTEN/
MUTE
MUTE
Preliminary Technical Data
VOLUME/
MUTE
VOLUME/
MUTE
CODEC
HEADPHONE
DRIVER
HEADPHONE
DRIVER
HPVDD
HPGND
RHPOUT
ROUT
LOUT
LHPOUT