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WM8739 Schematic ( PDF Datasheet ) - Wolfson Microelectronics plc

Teilenummer WM8739
Beschreibung STEREO AUDIO ADC
Hersteller Wolfson Microelectronics plc
Logo Wolfson Microelectronics plc Logo 




Gesamt 30 Seiten
WM8739 Datasheet, Funktion
WM8739 / WM8739L
Stereo Audio ADC
DESCRIPTION
The WM8739 is a stereo audio ADC. The WM8739 is
designed specifically for portable MP3 audio and speech
players and recorders. The WM8739 is also ideal for MD,
CD-RW machines and DAT recorders.
Stereo line-level audio inputs are provided, along with a
mute and volume function, and master or slave mode
clocking schemes. The device also has a programmable
high pass filter to remove residual DC offsets.
Stereo 24-bit multi-bit sigma delta ADCs are used with
oversampling digital interpolation and digital filters. Digital
audio output word lengths from 16-32 bits and sampling
rates from 8KHz to 96KHz are supported.
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 20-
pin SSOP package.
BLOCK DIAGRAM
FEATURES
90dB SNR (‘A’ weighted @ 48kHz) ADC
Low Power
- 12mW all-on, 1.4mW standby (‘L’ version)
- 41mW all-on, 5.3mW standby (standard version)
Low Supply Voltages
- 1.8 – 3.6V Analogue Supply (‘L’ version)
- 2.7 – 3.6V Analogue Supply (standard version)
- 1.42 – 3.6V Digital Supply (both versions)
Input Volume and Mute Controls
ADC Sampling Frequency: 8KHz – 96KHz
Selectable ADC High Pass Filter
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
20-Pin SSOP or 5x5mm QFN Package Options
APPLICATIONS
CD, Minidisc and DAT Recorders
General Purpose Audio Digitisation
AVDD
VMID
AGND
RLINEIN
VOL/
MUTE
+12 to -34.5dB,
1.5dB Steps
LLINEIN
VOL/
MUTE
+12 to -34.5dB,
1.5dB Steps
CONTROL INTERFACE
ADC
ADC
DIGITAL
FILTERS
WM8739
ADCDAT
ADCLRC
BCLK
OSC
DIV2
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
Advanced Information, September 2001, Rev 2.2
Copyright 2001 Wolfson Microelectronics Ltd.






WM8739 Datasheet, Funktion
WM8739 / WM8739L
Advanced Information
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
a zero signal applied. (No ‘Auto-zero’ or Automute function is employed in achieving these results).
2. Dynamic range (dB) - DNR 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 r.m.s. 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.
POWER CONSUMPTION
MODE
DESCRIPTION
TYP. SUPPLY CURRENTS
(MILLIAMPS)
IAVDD
IDBVDD IDCVDD
WM8739 (AVDD = 3.3V, DBVDD = 3.3V, DCVDD = 1.5V)
ADC Running
0 0 0 0 9.79 1.58 2.40
Standby
0 0 1 1 0.014 1.56 0.074
Power Down
1 0 X X 0.001 1.57 0.074
Power Down,
Oscillator disabled
1 1 X X 0.001 0.003 0.056
WM8739L (AVDD = 1.8V, DBVDD = 1.8V, DCVDD = 1.42V)
ADC Running
0 0 0 0 3.93 0.875 2.35
Standby
0 0 1 1 0.007 0.755 0.018
Power Down
1 0 X X 0.001 0.755 0.018
Power Down,
Oscillator disabled
1 1 X X 0.001 <1µA <1µA
Table 1 Powerdown Mode Current Consumption Examples
POWER
(mW)
41.12
5.31
5.30
0.097
11.99
1.397
1.386
0.002
Notes
1. TA = +25oC. Slave Mode, fs = 48kHz, XTI/MCLK = 256fs (12.288MHz).
2. All figures are quiescent, with no signal.
AI Rev 2.2 September 2001
6

6 Page









WM8739 pdf, datenblatt
WM8739 / WM8739L
LINEIN
12.5K
VMID
Advanced Information
To
ADC
Figure 8 Line Input Schematic
LINE INPUT SCHEMATIC
The gain between the line inputs and the ADC is logarithmically adjustable from +12dB to –34.5dB in
1.5dB steps under software control. The ADC Full Scale input is 1.0V rms at AVDD = 3.3 volts. Any
voltage greater than full scale will possibly overload the ADC and cause distortion. Note that the full
scale input tracks directly with AVDD. The gain is independently adjustable on both Right and Left
Line Inputs. However, by setting the INBOTH bit whilst programming the volume control, both
channels are simultaneously updated. Use of INBOTH reduces the required number of software
writes required. The line inputs can be muted in the analogue domain under software control. The
software control registers are shown below.
REGISTER
ADDRESS
0000000
Left Line In
BIT LABEL
4:0 LINVOL[0:4]
7 LINMUTE
8 LRINBOTH
0000001
Right Line In
4:0 RINVOL[0:4]
7 RINMUTE
8 RLINBOTH
Table 2 Line Input Software Control
DEFAULT
DESCRIPTION
10111
( 0dB )
1
0
10111
( 0dB )
1
0
Left Channel Line Input Volume Control
11111 = +12dB
. . 1.5dB steps down to
00000 = -34.5dB
Left Channel Line Input Mute
1 = Enable Mute
0 = Disable Mute
Left to Right Channel Line Input Volume
and Mute Data Load Control
1 = Enable Simultaneous Load of
LINVOL[0:4] and LINMUTE to
RINVOL[0:4] and RINMUTE
0 = Disable Simultaneous Load
Right Channel Line Input Volume Control
11111 = +12dB
. . 1.5dB steps down to
00000 = -34.5dB
Left Channel Line Input Mute
1 = Enable Mute
0 = Disable Mute
Right to Left Channel Line Input Volume
and Mute Data Load Control
1 = Enable Simultaneous Load of
RINVOL[0:4] and RINMUTE to
LINVOL[0:4] and LINMUTE
0 = Disable Simultaneous Load
AI Rev 2.2 September 2001
12

12 Page





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