ADSP-BF527C(RevPrC) 查看數據表（PDF） - Analog Devices
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ADSP-BF527C Datasheet PDF : 44 Pages
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ADSP-BF523C/ADSP-BF525C/ADSP-BF527C
Preliminary Technical Data
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.
AVDD
VMID
AGND
MICBIAS
RLINEIN
MICIN
LLINEIN
VOLUME
MIC
BOOST
MUTE
MUX
MUTE
VOLUME
MUTE MUX
MUTE
CSB CSDA CSCL CMODE
CONTROL INTERFACE
ADC
ADC
DIGITAL
FILTERS
MUTE
ATTEN/
MUTE
DAC
MUTE
6
DAC
MUTE
6
OSCPD
OSC
XTO
CLKIN
DIVIDER
CLKOUT
DIVIDER
DIGITAL AUDIO INTERFACE
ATTEN/
MUTE
MUTE
CODEC
HPVDD
HPGND
VOLUME/ HEADPHONE
MUTE
DRIVER
RHPOUT
ROUT
LOUT
VOLUME/ HEADPHONE
MUTE
DRIVER
LHPOUT
Figure 1. Audio CODEC Block Diagram
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.
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
Rev. PrC | Page 4 of 44 | June 2008
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