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PDF WM8722 Data sheet ( Hoja de datos )
| Número de pieza | WM8722 | |
| Descripción | Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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WM8722
Stereo DAC with Integrated Tone Generator and
Line/Variable Level Outputs
Advanced Information, May 2000, Rev 1.5
DESCRIPTION
The WM8722 is a high performance stereo DAC designed
for audio applications such as digital TV and set top boxes.
The WM8722 has two stereo analogue outputs, one at line
level and one that includes a digitally controllable mute and
attenuator function. An on-board tone generator can be
routed through the line or variable outputs.
WM8722 supports data input word lengths from 16-24 bits
and sampling rates up to 96kHz. The WM8722 consists of a
serial interface port, digital interpolation filter, multi-bit sigma
delta modulator and stereo DAC in a small 20-pin SSOP
package.
The 3 or 2-wire serial MPU compatible control port provides
access to all features including tone generation, on-chip
mute, attenuation and phase reversal.
The programmable data input port supports glueless
interfaces to popular DSPs, audio decoders and S/PDIF
and AES/EBU receivers.
FEATURES
• Performance
− 102dB SNR (‘A’ weighted @48kHz)
− THD+N: -90dB @ F.S.
− 5V or 3V supply operation
− Sampling frequency: 8kHz – 96kHz
• 3-wire or 2-wire serial MPU compatible interface for
− Input data word; 16/20/24-Bit
− Soft mute
− De-emphasis
− Volume control
• On-board tone generator (1Hz – 32kHz, 0.1 – 25.5s)
• Stereo analogue inputs
• 20-pin SSOP package
APPLICATIONS
• Digital TV
• Digital broadcast receivers
• Set top boxes
BLOCK DIAGRAM
DIN (17)
BCKIN (19)
LRCIN (18)
SCKI (20)
I2S/SDIF
16,18, 20
OR 24 BITS
MD (3)
MC (2)
LATCH (4)
BUSY (5)
SERIAL
INPUT
INTERFACE
MXINL(14)
+12 to -34.5dB, 1.5dB Steps
4 MONO ATTENUATION CONTROL
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
+ 0/-6dB
(13)LINEOUTL
+ 0/-6dB
(12) VAROUTL
L Mix Switches (0-9)
R Mix Switches (0-9)
+6 to -73dB,
1dB Steps
+ 0/-6dB
(9) VAROUTR
+ 0/-6dB
(8) LINEOUTR
TCLK (1)
TONE
GENERATOR
TONE
DAC
0 TO -46.5dB, 1.5dB
STEPS
(16) (6)
(10)
DVDD DGND AGND
(15)
CAP
(11) (7)
AVDD MXINR
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
http://www.wolfson.co.uk
+12 TO -34.5dB, 1.5dB
STEPS
WM8722
Advanced Information data sheets contain
preliminary data on new products in the
preproduction phase of development.
Supplementary data will be published at a
later date.
2000 Wolfson Microelectronics Ltd.
1 page  
Advanced Information
WM8722
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
Gain mismatch
Frequency Bandwidth
Master volume max gain
Master volume min gain
Master volume step size,
codes 0 - 47
Master volume step size,
codes 48 – 79
Master volume gain code
80 – 127 (mute)
Mixer trim max gain
Mixer trim min gain
Mixer trim step size
Tone Generator
SINAD (Note 3)
SINAD
SINAD
SINAD
SYMBOL
TEST CONDITIONS
Channel to channel
0dB gain
1Hz to 1kHz tones
1kHz to 2kHz tones
2kHz to 4kHz tones
4kHz to 32kHz tones
MIN
5
-70
0.7
0.5
-90
11
-32.5
1.3
65
60
55
50
TYP
+/-1%
100
6
-73
1
1
-100
12
-34.5
1.5
75
70
65
60
MAX
+/-5%
7
-76
1.3
1.5
13
-36.5
1.7
UNIT
% of FSR
kHz
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Full scale output voltage;
trims at
Tone Frequency
Tone Duration
Gain adjust range
Gain adjust step size (4
bit trim)
0dB
TCLK frequency = 27MHz
TCLK frequency = 27MHz
1
0.1
-46.5
1.25
2.5 V pk-pk
32767
Hz
25.5 secs
0 dB
1.5 1.75 dB
Notes: 1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured
‘A’ weighted over a 20Hz to 20kHz bandwidth.
2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher
THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low
pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
3. SINAD is ratio of signal to sum of noise, harmonics and spurii, over a bandwidth from 1Hz up to either 127x the
tone frequency, or 20kHz, whichever is the lower. (This is to allow for the lower frequency tones having images
at 127x and 129x the tone frequency which will fall in the audio band for tones of frequency less than about
20kHz/128).
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
5
5 Page 
Advanced Information
WM8722
SAMPLING RATE
(LRCIN)
SYSTEM CLOCK FREQUENCY (MHZ)
256fs
384fs
32kHz
8.192
12.288
44.1kHz
48kHz
11.2896
12.288
16.9340
18.432
96kHz
24.576
36.864
Table 1 System Clock Frequencies versus Sampling Rate
AUDIO DATA INTERFACE
The serial data interface to WM8722 is fully compatible with both normal (MSB first, right-justified) or
I2S interfaces. Data may be packed (number of serial BLCKS per LRCIN period is exactly 2 times the
number of data bits, i.e. normally 32 in 16 bit mode) or unpacked (more than 32 BCLKs per LRCIN
period.
The WM8722 will automatically detect 16-bit packed data being sent to the device in normal mode,
and accept the data in this input format accordingly.
I2S MODE
0
1
Table 2. Serial Interface Formats
DESCRIPTION
Normal format (MSB-first, right justified)
I2S format (Philips serial data protocol )
1/fs
LRCIN
BCKIN
LEFT CHANNEL
DIN
123
n-2 n-1 n
MSB
LSB
Figure 5. Normal Data Input Timing
1/fs
RIGHT CHANNEL
123
MSB
n-2 n-1 n
LSB
LRCIN
LEFT CHANNEL
BCKIN
DIN 1 2 3
MSB
Figure 6. I2S Data Input Timing
n-2 n-1 n
LSB
RIGHT CHANNEL
123
MSB
n-2 n-1 n
LSB
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet WM8722.PDF ] | |
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