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WM8785 데이터시트 PDF




Wolfson Microelectronics에서 제조한 전자 부품 WM8785은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 WM8785 자료 제공

부품번호 WM8785 기능
기능 Stereo ADC
제조업체 Wolfson Microelectronics
로고 Wolfson Microelectronics 로고


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WM8785 데이터시트, 핀배열, 회로
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24-Bit, 192kHz Stereo ADC
WM8785
DESCRIPTION
FEATURES
The WM8785 is a stereo audio ADC with differential inputs
designed for high performance recordable media applications.
Data is provided as a PCM output.
Stereo 24-bit multi-bit sigma-delta ADCs are used with digital
audio output word lengths of 16 to 32 bits, and sampling rates
from 8kHz to 192kHz. The device has a selectable high pass
filter to remove residual DC offsets. The device also supports a
TDM bus for data out.
The device is controlled via a 2 or 3 wire serial interface. The
interface provides access to all features including oversampling
rate, audio format, powerdown, master/slave control and digital
signal manipulation. The device is supplied in a 20-lead SSOP
package.
SNR 111dB (‘A’ weighted @ 48kHz)
THD -102dB (at -0.1dB)
Sampling Frequency: 8 – 192kHz
2 or 3 Wire Microprocessor Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
A TDM bus is supported for data out
Supply Voltages
- Analogue 4.5 to 5.5V
- Digital core: 2.7V to 3.6V
20-lead SSOP package
APPLICATIONS
Recordable DVD Players
Personal Video Recorders
High End Sound Cards
Studio Audio Processing Equipment
BLOCK DIAGRAM
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WOLFSON MICROELECTRONICS plc
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Production Data, December 2006, Rev 4.1
Copyright ©2006 Wolfson Microelectronics plc




WM8785 pdf, 반도체, 판매, 대치품
WM8785
PIN DESCRIPTION
PIN NAME
1 AINL+
2 AINL-
3 VREFGND
4 AVDD
5 AGND
6 LRCLK
7 DOUT
8 BCLK
9 MCLK
10 NC
11 SCLK
12 SDIN
13 CSB
14 NC
15 DVDD
16 DGND
17 VMID
18 VREF
19 AINR-
20 AINR+
TYPE
Analogue Input
Analogue Input
Analogue Reference
Supply
Supply
Digital Input / Output
Digital Output
Digital Input / Output
Digital Input
NC
Digital Input
Digital Input / Output
Digital Input
NC
Supply
Supply
Analogue Output
Analogue Reference
Analogue Input
Analogue Input
Production Data
DESCRIPTION
Left Channel Positive Input
Left Channel Negative Input
Negative Reference Connection
Analogue Supply
Analogue Ground (return path for AVDD)
Audio Interface Left / Right Clock
ADC Digital Audio Data
Audio Interface Bit Clock
Master Clock
No Connection
Control Interface Clock Input / 2 wire output
Control Interface Data Input
Chip Select / Control Interface Format Selection / 3 wire address select
No connection
Digital Supply
Digital Ground (return path for DVDD)
Midrail Voltage Decoupling Capacitor
Reference Voltage Decoupling Capacitor
Right Channel Negative Input
Right Channel Positive Input
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PD Rev 4.1 December 2006
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WM8785 전자부품, 판매, 대치품
Production Data
WM8785
Test Conditions
DVDD = 3.3V, AVDD = 5.0V, TA = +25oC, 1kHz signal, A-weighted, fs = 48kHz, MCLK = 256fs, 24-bit audio data, Slave Mode
unless otherwise stated.
PARAMETER
Supply Current
Analogue supply current
Digital supply current
Power Down
SYMBOL TEST CONDITIONS
MIN
TYP MAX
27
5
22
Note:
1. VMID is decoupled with 10uF and 0.1uF capacitors close to the device package. Smaller capacitors may reduce
performance.
UNIT
mA
mA
uA
TERMINOLOGY
1. Signal-to-noise ratio (dB) – Ratio of output level with 1kHz full scale input, to the output level with all zeros into the
digital input, over a 20Hz to 20kHz bandwidth. (No Auto-zero or Automute function is employed in achieving these
results).
2. Dynamic range (dB) - DR 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 rms 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.
5. All performance measurements are done with a 20kHz low pass filter, and where noted an A-weight filter, except
where noted. 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 this is not audible,
it may affect dynamic specification values
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PD Rev 4.1 December 2006
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