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WM9082 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM9082
Beschreibung PDM Input Mono 3W Class D Speaker Driver
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 24 Seiten
WM9082 Datasheet, Funktion
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WM9082
PDM Input Mono 3W Class D Speaker Driver
DESCRIPTION
The WM9082 is a high-performance sigma-delta Class D
speaker driver. Audio input is supported using a stereo PDM
interface; clock and control-code detection circuitry supports
all of the audio and control functions via a 2-wire interface.
The digital audio interface provides excellent noise
immunity, eliminating traditional input-filtering components.
The flexible 2-wire interface minimises the PCB footprint and
simplifies software development.
The combined audio and control interface configuration is
ideal for enabling the WM9082 to be located close to the
speaker; this reduces the length of the output connections,
giving good EMC performance and removing the need for
output filter components.
The sigma-delta architecture provides good power efficiency
and improved EMI performance with respect to traditional
PWM Class D designs.
A first-order high-pass filter can be selected on the input
signal to remove DC offsets and help to prevent speaker
damage. Other features include a low-power mute state,
and output slew-rate control.
Short-circuit and thermal protection is provided.
The WM9082 is supplied in a 9-ball 1.56 x 1.46mm CSP
package, with 0.5mm ball pitch.
FEATURES
Sigma-Delta Class-D speaker driver
- 92dB SNR - ‘A’ weighted
- 2.5W into 4(5V supply, 1% THD)
- 1.3W into 4(3.6V supply, 1% THD)
- 1.25W into 8(5V supply, 1% THD)
- 650mW into 8(3.6V supply, 1% THD
Stereo PDM digital audio input
Supports 32kHz, 44.1kHz, 48kHz sample rates (128fs input)
Automatic Left/Right channel selection
First-order high pass filter (HPF)
RF noise suppression
Pop and click suppression
Programmable output slew rates for low EMI
Short-circuit and thermal protection
9-ball CSP package
APPLICATIONS
Mobile Handsets
Portable Media Players (PMP)
Notebooks / Laptop computers
LCD televisions
BLOCK DIAGRAM
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Production Data, August 2012, Rev 4.1
Copyright 2012 Wolfson Microelectronics plc






WM9082 Datasheet, Funktion
WM9082
PARAMETER
Power Consumption
Quiescent current
(WM9082 in the ‘ON’
state; CLK enabled;
DATA input is idle
channel data.)
Standby current
(WM9082 in the
‘STANDBY’ state; CLK
enabled; DATA input is
repeated Control Code.)
Shutdown current
(WM9082 in the OFF
state; CLK and DATA
inputs disabled.)
SYMBOL
TEST CONDITIONS
IDVDD
ISPKVDD
RL = 4
RL = 8
IDVDD
ISPKVDD
IDVDD
ISPKVDD
Note 1: Guaranteed by design; not production-tested.
Production Data
MIN TYP MAX UNIT
0.6 mA
8 mA
8
250 µA
200 µA
0.6 µA
0.05 µA
TERMINOLOGY
1. Signal-to-Noise Ratio (dB) – SNR is the difference in level between a full scale output signal and the device output
noise with no signal applied, measured over a bandwidth of 20Hz to 20kHz. (No Auto-zero or Mute function is
employed).
2. Total Harmonic Distortion (dB) – THD is the difference in level between a 1kHz reference sine wave output signal and
the sum of the harmonics of the output signal. The amplitude of the fundamental frequency of the output signal is
compared to the RMS value of the sum of the harmonics and expressed as a ratio.
3. Total Harmonic Distortion plus Noise (dB) – THD+N is the difference in level between a 1kHz reference sine wave
output signal and all noise and distortion products in the audio band. The amplitude of the fundamental reference
frequency of the output signal is compared to the RMS value of all other noise and distortion products and expressed
as a ratio.
4. Power Supply Rejection Ratio (dB) – PSRR is a measure of ripple attenuation between a power supply rail and a
signal output path. With the signal path idle, a small sine wave ripple is applied to power supply rail. The amplitude of
the supply ripple is compared to the amplitude of the output signal generated and is expressed as a ratio.
5. All performance measurements are carried out with 20kHz AES17 low pass filter for distortion measurements, and an
A-weighted filter for noise measurement. Failure to use such a filter will result in higher THD 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.
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PD, August 2012, Rev 4.1
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WM9082 pdf, datenblatt
WM9082
Production Data
As noted above, the WM9082 Control Codes are only valid when they are transmitted consecutively
for the required number of times. The valid Control Codes can be used to control the operating state
of the WM9082 and also to select different operating modes.
The “Page 2 access” Control Code enables the Page 2 Control Codes for the next control code only;
the Page 1 codes will apply again for any subsequent control code(s).
The state transitions and operating modes are described below.
INITIAL POWER-UP
When a valid CLK signal is first detected on IN1 or IN2, the WM9082 powers up to the “STANDBY”
state. The WM9082 will remain in this state until a “Start-up Event” is detected, or until the CLK signal
is removed.
CONFIGURATION EVENTS
In the STANDBY state, the WM9082 can be configured (if required) using the Control Code
sequences listed in Table 6.
Note that these Control Code sequences are only valid when the WM9082 is in the STANDBY state; it
is not possible to configure the device whilst simultaneously sending audio data.
The following features are configurable in the STANDBY state:
Sample rate (33kHz, 44.1kHz or 48kHz)
Input path High Pass Filter (HPF)
Output slew rate control
Operating Mode (PSRR vs SNR control)
The cut-off frequency of the input path HPF, when enabled, is around 2Hz, assuming a 48kHz audio
sample rate (CLK = 6.144MHz).
The operating mode selections provide different options for SNR vs PSRR optimisation.
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PD, August 2012, Rev 4.1
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