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XWM8711EDS Schematic ( PDF Datasheet ) - Wolfson Microelectronics plc

Teilenummer XWM8711EDS
Beschreibung Internet Audio DAC with Integrated Headphone Driver
Hersteller Wolfson Microelectronics plc
Logo Wolfson Microelectronics plc Logo 




Gesamt 30 Seiten
XWM8711EDS Datasheet, Funktion
WM8711
Internet Audio DAC with Integrated Headphone Driver
Product Preview, Novembert 2000, 1.2
DESCRIPTION
The WM8711 is a low power stereo DAC with an integrated
headphone driver. The WM8711 is designed specifically for
portable MP3 audio and speech players. The WM8711 is
also ideal for MD, CD machines and DAT players.
Stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8KHz
to 96KHz are supported.
Stereo audio outputs are buffered for driving headphones
from a programmable volume control, line level outputs are
also provided along with anti-thump mute and power
up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
volume controls, mutes, de-emphasis and extensive power
management facilities. The device is available in a small 28-
pin SSOP package.
A USB mode is provided where all audio rates can be
derived from a single 12MHz MCLK, saving on the need for
a PLL or multiple crystals.
FEATURES
Audio Performance
- 100dB SNR (‘A’ weighted @ 48kHz) DAC
- 1.42 – 3.6V Digital Supply Operation
- 2.7 – 3.6V Analogue Supply Operation
DAC Sampling Frequency: 8KHz – 96KHz
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
- Master or Slave Clocking Mode
Stereo Audio Outputs
Output Volume and Mute Controls
Highly Efficient Headphone Driver
Playback Mode Power Consumption < 18mW
28-Pin SSOP Package
APPLICATIONS
Portable MP3 Players
CD and Minidisc Players
BLOCK DIAGRAM
(22) (23) (24) (21)
(14) (16) (15)
WM8711
CONTROL INTERFACE
DACDAT (4)
DACLRC (5)
BCLK (3)
DAC
MUTE
Σ
VOL/
MUTE
+6 to -73dB
1 dB Steps
H/P
DRIVER
DIGITAL
FILTERS
OSC
DAC Σ
CLKIN
DIVIDER
(Div x1, x2)
CLKIN
DIVIDER
(Div x1, x2)
MUTE
+6 to -73dB
1 dB Steps
VOL/
MUTE
H/P
DRIVER
(26) (25)
(2)
(27) (1) (28)
(8) HPVDD
(11) HPGND
(19) RLINEIN
(10) RHPOUT
(13) ROUT
(12) LOUT
(9) LHPOUT
(20) LLINEIN
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
http://www.wolfson.co.uk
Product Preview data sheets contain
specifications for products in the formative
phase of development. These products may
be changed or discontinued without notice.
2000 Wolfson Microelectronics Ltd.






XWM8711EDS Datasheet, Funktion
WM8711
POWER CONSUMPTION
MODE DESCRIPTION
Product Preview
CURRENT CONSUMPTION
Playback
00000
Playback Oscillator and 0 1 1 0 0
CLKOUT disabled
Standby
01111
Power Down
1XXX1
Table 1 Powerdown Mode Current Consumption Examples
MIN TYP MAX UNITS
7 mA
6 mA
0.05
0.01
mA
mA
Notes:
1. AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC. Slave Mode, fs = 48kHz,
MCLK = 256fs (12.288MHz).
2. All figures are quiescent, with no signal.
3. The power dissipation in the headphone itself not included in the above table.
MASTER CLOCK TIMING
MCLK
tXTIL
tXTIH
tXTIY
Figure 1 System Clock Timing Requirements
Test Conditions
AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode fs = 48kHz, MCLK =
256fs unless otherwise stated.
PARAMETER
SYMBOL
System Clock Timing Information
MCLK System clock pulse width high
TXTIH
MCLK System clock pulse width low
TXTIL
MCLK System clock cycle time
TXTIY
MCLK Duty cycle
TEST CONDITIONS
MIN
18
18
54
40:60
TYP
MAX
UNIT
60:40
ns
ns
ns
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 November 2000
6

6 Page









XWM8711EDS pdf, datenblatt
WM8711
Product Preview
FROM LINE
INPUTS
BYPASS
FROM DAC
DACSEL
VMID
LINEOUT
TO HEADPHONE AMP
Figure 8 Line Output Schematic
The line output is muted by either muting the DAC (analogue) or Soft Muting (digital) and disabling
the BYPASS path. Refer to the DAC section for more details. Whenever the DAC is muted or the
device placed into standby mode the DC voltage is maintained at the line outputs to prevent any
audible clicks from being present.
The software control for the line outputs is shown in Table 3.
REGISTER
ADDRESS
BIT
LABEL
0000100
3 BYPASS
Analogue
Audio Path
Control
4 DACSEL
Table 3 Output Software Control
DEFAULT
1
0
DESCRIPTION
Bypass Switch
1 = Enable Bypass
0 = Disable Bypass
DAC Select
1 = Select DAC
0 = Dont select DAC
The recommended external components are shown in Figure 9.
LINEOUT
R2
C1
R1
AGND
AGND
Figure 9 Line Outputs Application Drawing
Recommended values are C1 = 470nF (10V npo type), R1 = 47KOhms, R2 = 100 Ohms
C1 forms a DC blocking capacitor to the line outputs. R1 prevents the output voltage from drifting so
protecting equipment connected to the line output. R2 forms a de-coupling resistor preventing
abnormal loads from disturbing the device. Note that poor choice of dielectric material for C1 can
have dramatic effects on the measured signal distortion at the output.
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 November 2000
12

12 Page





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