參數(shù)資料
型號: P95020ZLLG
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 電源管理
英文描述: 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124
封裝: LLGA-124
文件頁數(shù): 63/137頁
文件大?。?/td> 3533K
代理商: P95020ZLLG
P95020 / Preliminary Datasheet
Revision 0.7.10
31
2010 Integrated Device Technology, Inc.
2.10
AUDIO - REFERENCE VOLTAGE GENERATOR, BUFFER, & FILTERING CAPS
AVREF
The AVREF pin is part of the internal virtual ground reference generator. A capacitor placed between AVREF and
AGND is necessary for acceptable power supply rejection and anti-pop performance. A capacitor of 10
F is
recommended to provide about a 10 second ramp-up time.
ADCREF
The ADC reference also requires a capacitor of at least 1 F for proper operation.
AFILT
ADC1 augments its internal filter capacitors with external filter capacitors to reduce noise outside of the audio
band before sampling. 1000 pF capacitors connected from the AFILT1 and AFILT2 pins to AGND are
recommended but larger capacitors may be used if reduced signal bandwidth is acceptable. Process variation
will cause bandwidth to vary from part to part. A 1000 pF capacitor will place the filter pole far outside of the 20
kHz bandwidth supported so that the ±1 dB 20 kHz bandwidth limit is guaranteed.
2.11
AUDIO - ANALOG AND CLASS D OUTPUT BLOCK
The Audio subsection provides support for line level, headphone and speaker outputs.
The analog line output port features a source MUX and single ended output buffer designed to drive high impedance
loads. This port has selectable 0/3/6 db gain for -6 dBV, -3 dBV or 0 dBV DAC output levels respectively. The Cap-less
Stereo Headphone Output port is similar to the line level output port but can drive 32 ohm headphones and may operate
without DC blocking capacitors by connecting the physical headphones ground return to the VIRT_GND pin.
A CLASS_D Mono BTL Output and Class D Stereo Processor w/ digital volume control (See CLASS_D section for more
information) provides up to 2.5 W of output power into a 4 ohm speaker.
The line output port, headphone port and CLASS_D BTL Power Output can select from the mixer, DAC0, DAC1 or the
line input (LINE_IN). The line input selection is intended for very low power LINE_IN to LINE_OUT pass-thru when
VDD_AUDIO33 and VDD_AUDIO18 power on, and config LINE_OUT_SCTRL (Setting 2h, see Section 2.15.24) to select
LINE_OUT from LINE_IN.
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