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부품번호 WM8720 기능
기능 24-bit/ 96kHz Stereo DACwith Volume Control
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WM8720 데이터시트, 핀배열, 회로
WM8720
24-bit, 96kHz Stereo DAC with Volume Control
Production Data, November 2000, Rev 3.0
DESCRIPTION
The WM8720 is a high performance stereo DAC designed
for audio applications such as CD, DVD, home theatre
systems, set top boxes and digital TV. The WM8720
supports data input word lengths from 16 to 24-bits and
sampling rates up to 96kHz. The WM8720 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 WM8720 also includes a digitally
controllable mute and attenuator function on each channel.
The WM8720 supports a variety of connection schemes for
audio DAC control. The SPI-compatible serial control port
provides access to a wide range of features including on-
chip mute, attenuation and phase reversal. A hardware
controllable interface is also available.
The programmable data input port supports a variety of
glueless interfaces to popular DSPs, audio decoders and
S/PDIF and AES/EBU receivers.
FEATURES
Performance:
- 102dB SNR (‘A’ weighted @48kHz),
- THD: -95dB @ 0dB FS
5V or 3.3V supply operation
Sampling frequency: 8kHz to 96kHz
Input data word: 16 to 24-bit
Hardware or SPI compatible serial port control modes:
- Hardware mode: system clock, reset, mute,
de-emphasis
- Serial control mode: mute, de-emphasis, digital
attenuation (256 steps), zero mute, phase reversal,
power down
Compatible with PCM1720
APPLICATIONS
CD, DVD audio
Home theatre systems
Set top boxes
Digital TV
BLOCK DIAGRAM
SCKI
(2)
ML/I2S MC/IWL MD/DM PWDN RSTB MODE MUTE
(4) (5) (6)
(1) (7) (18) (17)
BCKIN (14)
LRCIN (16)
DIN (15)
256fs/384fs
SERIAL
INTERFACE
DIGITAL
FILTERS
CONTROL INTERFACE
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
WM8720
(3) TEST
(8) ZERO
DAC
(9) VOUTR
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
DAC
(12) VOUTL
(20) (10) (13) (11) (19)
DGND AGND CAP AVDD DVDD
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
Production Data Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2000 Wolfson Microelectronics Ltd.




WM8720 pdf, 반도체, 판매, 대치품
WM8720
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
DAC Circuit Specifications
SNR (Note 1)
THD
Dynamic range
Passband
Stopband
Pass band ripple
Out of band rejection
Channel Separation
Gain mismatch
channel-to-channel
Digital Logic Levels
TEST CONDITIONS
AVDD, DVDD = 5V
AVDD, DVDD = 3.3V
0dB FS
THD+N @ -60dB FS
±0.25dB
-3dB
0dB FS
MIN
95
95
0.491
TYP
102
100
-96
102
±0.25
-40
98
±0.5
MAX
-85
0.4535
±5
Input LOW level
Input HIGH level
Output LOW level
Output HIGH level
Analogue Output Levels
VIL
VIH
VOL
VOH
IOL = 2mA
IOH = 2mA
2.0
AVDD - 0.3V
0.8
AVSS + 0.3V
Output level
Minimum resistance load
Into 10kohm, full scale 0dB,
(5V supply)
Into 10kohm, full scale 0dB,
(3.3V supply)
To midrail or AC coupled
(5V supply)
1.1
0.72
1
Maximum capacitance
load
Output DC level
Reference Levels
To midrail or AC coupled
(3.3V supply)
5V or 3.3V
1
100
AVDD/2
Potential divider
resistance
AVDD to CAP and CAP to AGND
90
Voltage at CAP
POR
POR threshold
AVDD/2
2.0
UNIT
dB
dB
dB
dB
fs
fs
dB
dB
dB
%FSR
V
V
VRMS
VRMS
kohms
kohms
pF
V
kohms
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.
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. (eg THD+N @ -60dB= -32dB, DR= 92dB).
3. THD+N (dB) is a ratio of the r.m.s. values, of (Noise + Distortion)/Signal.
4. Stop band attenuation (dB) is the degree to which the frequency spectrum is attenuated (outside audio band).
5. Channel Separation (dB) (also known as Cross-Talk) 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.
6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
WOLFSON MICROELECTRONICS LTD
PD Rev 3.0 November 2000
4

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WM8720 전자부품, 판매, 대치품
Production Data
WM8720
DEVICE DESCRIPTION
WM8720 is a complete stereo audio digital-to-analogue converter, including digital interpolation filter,
multibit sigma delta with dither, switched capacitor multibit stereo DAC and output smoothing filters.
Control of internal functionality of the device is by either hardware control (pin programmed) or
software control (serial interface). The MODE pin selects between hardware and software control. In
software control mode, an SPI type interface is used. This interface may be asynchronous to the
audio data interface. Control data will be re-synchronized to the audio processing internally.
The device is pin compatible with the PCM1720, but uses additional pins that are not used on that
device to achieve greater user flexibility.
Operation using system clock of 256fs or 384fs is provided. Selection between clock rates is being
automatically controlled in hardware mode, or serial controlled when in software mode. Sample rates
(fs) from less than 8ks/s to 96ks/s are allowed, provided the appropriate system clock is input.
The data interface supports normal (Japanese right justified) and I2S (Philips left justified, one bit
delayed) interface formats, in both packedand unpacked forms. When in hardware mode, the three
serial interface pins become control pins to allow selection of input data format type (I2S or normal),
input word length (16, 18, 20, or 24-bit) and de-emphasis function.
SYSTEM CLOCK
The system clock for WM8720 must be either 256fs or 384fs, where fs is the audio sampling
frequency (LRCIN) typically 32kHz, 44.1kHz, 48 or 96kHz. The system clock is used to operate the
digital filters and the noise shaping circuits.
WM8720 has a system clock detection circuitry that automatically determines what the system clock
frequency relative to the sampling rate is (to within ±8 system clocks). If greater than 8 clocks error,
then the interface shuts down the DAC and mutes the output. The system clock should be
synchronised with LRCIN, but WM8720 is tolerant of phase differences or jitter on this clock. Severe
distortion in the phase difference between LRCIN and the system clock will be detected, and cause
the device to automatically resynchronise. If the externally applied LRCIN slips in phase by more
than half the internal LRCIN period, which is derived from master clock, then the interface
resynchronises. Such a case would, for example, occur if repeated LRCIN clocks were received with
only 252 systems clocks per period. In this case the interface would resynchronise every 64 LRCIN
periods. During resynchronisation, the device will either repeat the previous sample, or drop the next
sample, depending on the nature of the phase slip. This will ensure no discernible click at the
analogue outputs during resynchronisation. Table 1 shows the typical system clock frequency inputs
for the WM8720.
SAMPLING RATE (LRCIN)
SYSTEM CLOCK FREQUENCY (MHZ)
256fs
384fs
32kHz
8.192
12.288
44.1kHz
11.2896
16.9340
48kHz
12.288
18.432
96kHz
24.576
36.864
Table 1 System Clock Frequencies Versus Sampling Rate
AUDIO DATA INTERFACE
The Serial Data interface to WM8720 is fully compatible with both normal (MSB first, right-justified) or
I2S interfaces. Data may be packed(number of serial bit clocks 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 bit clocks per
LRCIN period).
The WM8720 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 )
WOLFSON MICROELECTRONICS LTD
PD Rev 3.0 November 2000
7

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