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WM8955L 데이터시트 PDF




Wolfson Microelectronics plc에서 제조한 전자 부품 WM8955L은 전자 산업 및 응용 분야에서
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부품번호 WM8955L 기능
기능 STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
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WM8955L 데이터시트, 핀배열, 회로
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WM8955L
Stereo DAC for Portable Audio Applications
DESCRIPTION
FEATURES
The WM8955L is a low power, high quality stereo DAC with
integrated headphone and loudspeaker amplifiers, designed to
reduce external component requirements in portable digital
audio applications.
The on-chip headphone amplifiers can deliver 40mW into a 16Ω
load. Advanced on-chip digital signal processing performs bass
and treble tone control.
The WM8955L can operate as a master or a slave, and
includes an on-chip PLL. It can use most master clock
frequencies commonly found in portable systems, including
USB, GSM, CDMA or PDC clocks, or standard 256fs clock
rates. Different audio sample rates such as 48kHz, 44.1kHz,
8kHz and many others are supported.
The WM8955L operates on supply voltages from 1.8V up to
3.6V, although the digital core can operate on a separate supply
down to 1.42V, saving power. Different sections of the chip can
also be powered down under software control.
The WM8955L is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
BLOCK DIAGRAM
DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V)
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
- 40mW output power on 16Ω / 3.3V
- SNR 96dB, THD –79dB at 20mW with 16Ω load
Stereo and Mono Line-in mix into DAC output
Separately Mixed Stereo and Mono Outputs
Digital Tone Control and Bass Boost
Low Power
- Down to 7mW for stereo playback (1.8V / 1.5V supplies)
- 10μW Shutdown Mode
Low Supply Voltages
- Analogue and Digital I/O: 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
Master clocks supported: GSM, CDMA, PDC, USB or
standard audio clocks
Audio sample rates supported: 8, 11.025, 12, 16, 22.05, 24,
32, 44.1, 48, 88.2, 96kHz
32-lead QFN package, 5x5x0.9mm size, 0.5mm lead pitch
APPLICATIONS
Smartphone / Multimedia Phone
Digital Audio Player
WOLFSON MICROELECTRONICS plc
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Production Data, May 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc




WM8955L pdf, 반도체, 판매, 대치품
WM8955L
PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
9
NAME
MCLK
DCVDD
DBVDD
DGND
BCLK
DACDAT
DACLRC
CLKOUT
PLLGND
10 MONOOUT
11 OUT3
12 ROUT1
13 LOUT1
14 HPGND
15 ROUT2
16 LOUT2
17 HPVDD
18 AVDD
19 AGND
20 VREF
21 VMID
22 NC
23 HPDETECT
24 NC
25 MONOIN-
26 MONOIN+
27 LINEINR
28 LINEINL
29 MODE
30 CSB
31 SDIN
32 SCLK
Production Data
TYPE
Digital Input
Supply
Supply
Supply
Digital Input / Output
Digital Input
Digital Input / Output
Digital Output
Supply
Analogue Output
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Analogue Output
Supply
Supply
Supply
Analogue Output
Analogue Output
No Connect
Logic Input
No Connect
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
DESCRIPTION
Master Clock
Digital Core Supply
Digital Buffer (I/O) Supply
Digital Ground (return path for both DCVDD and DBVDD)
Audio Interface Bit Clock
DAC Digital Audio Data
Audio Interface Left / Right Clock
Buffered Clock Output (from MCLK or internal PLL)
Internally connected to AGND. Connect this pin to AGND externally
for best PLL performance, or leave floating.
Mono Output
Output 3 (can be used as Headphone Pseudo Ground)
Right Output 1 (Line or Headphone)
Left Output 1 (Line or Headphone)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2)
Right Output 1 (Line or Headphone or Speaker)
Left Output 1 (Line or Headphone or Speaker)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2,
MONOUT)
Analogue Supply
Analogue Ground (return path for AVDD)
Reference Voltage Decoupling Capacitor
Midrail Voltage Decoupling Capacitor
No Internal Connection
Headphone / Speaker switch (referred to AVDD)
No Internal Connection
Negative end of MONOIN+, for differential mono signals
Analogue Line-in to mixers (mono channel)
Analogue Line-in to mixers (right channel)
Analogue Line-in to mixers (left channel)
Control Interface Selection
Chip Select / Device Address Selection
Control Interface Data Input / 2-wire Acknowledge output
Control Interface Clock Input
Note:
It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.
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PD, Rev 4.3, May 2010
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WM8955L 전자부품, 판매, 대치품
Production Data
WM8955L
Test Conditions
DCVDD = 1.5V, AVDD = HPVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
Analogue Reference Levels
Midrail Reference Voltage
VMID
–3%
AVDD/2
+3%
V
Buffered Reference Voltage
VREF
–3%
AVDD/2
+3%
V
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
VIH 0.7×DBVDD
VIL
VOH
IOH = -1mA
0.9×DBVDD
VOL IOL = 1mA
0.3×DBVDD
0.1×DBVDD
V
V
V
V
TERMINOLOGY
1. Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output
with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).
2. Dynamic range (dB) - DR is a measure of the difference between the highest and lowest portions of a signal.
Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB
to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).
3. THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
4. Channel Separation (dB) - Also known as Cross-Talk. This is a measure of the amount one channel is isolated from
the other. Normally measured by sending a full scale signal down one channel and measuring the other.
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PD, Rev 4.3, May 2010
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관련 데이터시트

부품번호상세설명 및 기능제조사
WM8955

STEREO DAC FOR PORTABLE AUDIO APPLICATIONS

Wolfson Microelectronics plc
Wolfson Microelectronics plc
WM8955BL

Stereo DAC

Wolfson Microelectronics
Wolfson Microelectronics

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