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Número de pieza | WM8734 | |
Descripción | STEREO AUDIO CODEC | |
Fabricantes | ETC | |
Logotipo | ||
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Stereo Audio CODEC
WM8734
DESCRIPTION
The WM8734 is a low power stereo CODEC ideal for MD,
CD-RW machines and DAT recording applications.
Stereo line inputs are provided, along with a mute function
and programmable line level volume control.
Stereo 24-bit multi-bit sigma delta ADCs and DACs are
used with oversampling digital interpolation and decimation
filters.
Digital audio input word lengths from 16-32 bits and
sampling rates from 8kHz to 96kHz are supported.
Stereo audio line level outputs are 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 level
controls, mutes, de-emphasis and power management
facilities. The device is available in 20-pin SSOP or 5x5mm
QFN packages.
FEATURES
• Audio Performance
− 90dB SNR (‘A’ weighted @ 48kHz) ADC
− 100dB SNR (‘A’ weighted @ 48kHz) DAC
− 2.7 – 3.6V Digital Supply Operation
− 2.7 – 3.6V Analogue Supply Operation
• ADC and DAC 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
• Stereo Audio Inputs and Outputs
• 20-Pin SSOP or 5x5mm QFN Package Options
APPLICATIONS
• CD and Minidisc Recorder
• MP3 Player / Recorder
BLOCK DIAGRAM
AVDD
VMID
AGND
RLINEIN
LLINEIN
CONTROL INTERFACE
W
WM8734
VOL
+12 to -34.5dB,
1.5dB Steps
VOL
+12 to -34.5dB,
1.5dB Steps
CLKIN
DIVIDER
(Div x1, x2)
ADC
ADC
DIGITAL
FILTERS
DAC
MUTE
DAC
MUTE
DIGTAL AUDIO INTERFACE
ROUT
LOUT
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
Advanced Information, November 2001, Rev 2.2
Copyright 2001 Wolfson Microelectronics Ltd.
1 page WM8734
Advanced Information
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 256fs unless
otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (CMOS Levels)
Input LOW level
VIL
0.3 x DBVDD
V
Input HIGH level
VIH
0.7 x DBVDD
V
Output LOW
VOL
0.10 x
DBVDD
V
Output HIGH
VOH
0.9 x DBVDD
V
Power On Reset Threshold (DCVDD)
DCVDD Threshold On -> Off
Vth
0.9 V
Hysteresis
VIH
0.3 V
DCVDD Threshold Off -> On
VOL
0.6 V
Analogue Reference Levels
Reference voltage
Potential divider resistance
VVMID
RVMID
AVDD/2
50k
V
Ohms
Line Input to ADC
Input Signal Level (0dB)
VINLINE
1.0
AVDD/3.3
Vrms
SNR (Note 1,3)
A-weighted, 0dB gain
@ fs = 48kHz
85
90
dB
SNR (Note 1,3)
A-weighted, 0dB gain
@ fs = 96kHz
90
dB
SNR (Note 1,3)
A-weighted, 0dB gain
@ fs = 48KHz, AVDD =
2.7V
88
dB
Dynamic Range (Note 3)
DNR
A-weighted, -60dB full
scale input
85
90
dB
THD
-1dB input, 0dB gain
-84 -74 dB
Power Supply Rejection Ratio
PSSR
1kHz 100mVpp
50
dB
20Hz to 20kHz
100mVpp
45
dB
ADC channel separation
1kHz input
90 dB
Programmable Gain Maximum
1kHz input
+12 dB
Programmable Gain Minimum
Rsource < 50 Ohms
-34.5
Programmable Gain Step Size
Guaranteed Monotonic
1.5
dB
Mute attenuation
0dB, 1kHz input
80
dB
Input Resistance
RINLINE
0dB gain
20k 30k
Ohms
12dB gain
10k 15k
Ohms
Input Capacitance
CINLINE
10 pF
w
AI Rev 2.2 November 2001
5
5 Page WM8734
Advanced Information
SDIN
SCLK
t3
t6
t1
t5
t2
t7
t10
t3
t4
t8
Figure 7 Program Register Input Timing – 2-Wire MPU Serial Control Mode
Test Conditions
AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 256fs unless
otherwise stated.
PARAMETER
SYMBOL
Program Register Input Information
SCLK Frequency
SCLK Low Pulsewidth
SCLK High Pulsewidth
Hold Time (Start Condition)
Setup Time (Start Condition)
t1
t2
t3
t4
Data Setup Time
SDIN, SCLK Rise Time
SDIN, SCLK Fall Time
Setup Time (Stop Condition)
t5
t6
t7
t8
Data Hold Time
t10
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0 400 kHz
600 ns
1.3 us
600 ns
600 ns
100 ns
300 ns
300 ns
600 ns
900 ns
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AI Rev 2.2 November 2001
11
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet WM8734.PDF ] |
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