WOLFSON WM3100GER

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WM3100
High Performance Stereo 2Vrms Line Driver
DESCRIPTION
FEATURES
The WM3100 is a high performance stereo 2VRMS line driver
with ground referenced outputs.
•
•
•
•
•
108dB SNR (‘A’ weighted)
-95dB THD+N
108dB dynamic range
Single-ended or differential input
Fixed gain +6.4dB
•
Digital control inputs
- Mute pin
- High impedance output mode
Pop and click suppression
Fast start-up
- 200μs start-up from OFF
- 100μs start-up from MUTE
The device is ideal for cost-sensitive applications requiring line
level outputs, minimal external components and small PCB
area. The WM3100 offers excellent audio performance.
The two high performance amplifiers are capable of driving a
wide variety of loads. The device supports single-ended or
differential input configurations. The input and feedback
resisitors around both amplifiers are integrated within the
WM3100, giving a high impedance input and a fixed signal gain
of +6.4dB.
An on-board charge pump is provided to generate the negative
supply for the ground-referenced drivers; the charge pump
requires only two external capacitors for normal operation.
The line outputs can be muted using a hardware control input. A
high impedance mute state is also supported, where the outputs
are undriven - this is useful in applications where a common
external connector is used as an input and an output.
The device uses a single 3.3V supply, and is available in a 14pin SOIC.
•
•
•
•
3.3V supply
14-pin SOIC
APPLICATIONS
•
•
•
•
•
Digital televisions
DVD players & recorders
Blu-ray disc players
Gaming consoles
Set-top boxes
BLOCK DIAGRAM
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Preliminary Technical Data, October 2010, Rev 2.0
Copyright ©2010 Wolfson Microelectronics plc
WM3100
Preliminary Technical Data
TABLE OF CONTENTS
DESCRIPTION ....................................................................................................... 1
FEATURES............................................................................................................. 1
APPLICATIONS ..................................................................................................... 1
BLOCK DIAGRAM ................................................................................................. 1
TABLE OF CONTENTS ......................................................................................... 2
PIN CONFIGURATION ........................................................................................... 3
ORDERING INFORMATION .................................................................................. 3
PIN DESCRIPTION ................................................................................................ 3
ABSOLUTE MAXIMUM RATINGS ......................................................................... 4
RECOMMENDED OPERATING CONDITIONS ..................................................... 4
ELECTRICAL CHARACTERISTICS ...................................................................... 5
TERMINOLOGY ............................................................................................................. 6
DEVICE DESCRIPTION ......................................................................................... 7
INTRODUCTION............................................................................................................ 7
INPUT SIGNAL PATH .................................................................................................... 7
OUTPUT SIGNAL PATH ................................................................................................ 8
CHARGE PUMP............................................................................................................. 9
DIGITAL CONTROL INPUTS ......................................................................................... 9
RECOMMENDED EXTERNAL COMPONENTS .................................................. 10
AUDIO INPUT PATHS ................................................................................................. 10
AUDIO OUTPUT PATHS ............................................................................................. 10
POWER SUPPLY DECOUPLING ................................................................................ 10
CHARGE PUMP COMPONENTS ................................................................................ 10
RECOMMENDED EXTERNAL CONNECTIONS .......................................................... 11
PACKAGE DIMENSIONS .................................................................................... 12
IMPORTANT NOTICE .......................................................................................... 13
ADDRESS: ................................................................................................................... 13
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WM3100
Preliminary Technical Data
PIN CONFIGURATION
ORDERING INFORMATION
ORDER CODE
TEMPERATURE RANGE
PACKAGE
MOISTURE
SENSITIVITY LEVEL
PEAK SOLDERING
TEMPERATURE
WM3100GED
-40°C to +85°C
14-pin SOIC
MSL1
260°C
WM3100GED/R
-40°C to +85°C
14-pin SOIC
(Pb-free, Tape and reel)
MSL1
260°C
Note:
Tube quantity = 56
Reel quantity = 3000
PIN DESCRIPTION
PIN NO
NAME
1
LINEOUT1
Analogue Output
TYPE
DESCRIPTION
2
LINEOUT2
Analogue Output
Line output 2
3
CPVOUTN
Analogue Output
Charge pump output decoupling pin
4
CPCB
Analogue Output
Charge pump fly-back capacitor pin
5
GND
Supply
Ground
6
CPCA
Analogue Output
Charge pump fly-back capacitor pin
Line output 1
7
VDD
Supply
Positive supply pin
8
OUTMODE
Digital Input
Output mode control pin
0 = Normal operation
1 = High impedance mute state
9
MUTE
¯¯¯¯¯
Digital Input
Mute control (only valid when OUTMODE = 0)
0 = Output muted
1 = Normal operation
10
IN2N
Analogue Input
Inverting input 2
11
IN2P
Analogue Input
Non-inverting input 2
12
IN1N
Analogue Input
Inverting input 1
13
IN1P
Analogue Input
Non-inverting input 1
14
LINEREF
Analogue Input
Line output reference (connect to GND)
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Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously
operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given
under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN
MAX
-0.3V
+4.5V
Voltage range digital inputs
GND -0.3V
VDD +0.3V
Voltage range analogue inputs
GND -0.3V
VDD +0.3V
Supply voltage (VDD)
Operating temperature range, TA
-40ºC
+85ºC
Junction temperature, TJMAX
-40ºC
+150ºC
Storage temperature after soldering
-65ºC
+150ºC
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
Supply voltage
VDD
2.97
3.3
3.6
V
Ground
GND
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0
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WM3100
Preliminary Technical Data
ELECTRICAL CHARACTERISTICS
Test Conditions
VDD=3.3V, GND=0V, TA = +25oC, 1VRMS 1kHz sinusoidal input signal unless otherwise stated
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Analogue Inputs
Maximum full-scale input signal
level. (This changes in proportion
to VDD.)
Input resistance
RIN
1
VRMS
24
kΩ
2.1
VRMS
Analogue Outputs
Full-scale output signal level. (This
changes in proportion to VDD.)
Full scale input signal, RL = 10kΩ
DC offset
Minimum load resistance
0
RL
Maximum load capacitance
±3
2.5
mV
kΩ
Without external RC filter
220
pF
With recommended external RC filter
1
μF
Audio Performance
Signal to Noise ratio
Total Harmonic Distortion + Noise
(2.1VRMS output, 10kΩ load)
Dynamic range
SNR
THD+N
DNR
Channel separation (L/R)
A-weighted, 20Hz to 20kHz
108
unweighted, 20Hz to 20kHz
104
Single-ended inverting input
-91
Single-ended non-inverting input
-95
dB
dB
Differential input
-92
A-weighted, -60dBV input
108
dB
1kHz
90
dB
20Hz to 20kHz
80
Channel level matching
1kHz
0.1
dB
Channel phase deviation
1kHz
0.1
degree
Gain
Power Supply Rejection Ratio
(VDD)
Mute attenuation
Output impedance
(high impedance mute state)
6.2
PSRR
100mV pk-pk, 1kHz
69
100mV pk-pk, 20Hz to 20kHz
MUTE
¯¯¯¯¯ =0
6.6
dB
dB
50
70
dB
50
kΩ
Internal low-pass filter 3dB cut-off
300
kHz
Start-up time (from OFF)
200
μs
Start-up time (from MUTE)
100
μs
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OUTMODE = 1
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Preliminary Technical Data
TERMINOLOGY
1.
Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum full scale output
signal and the output with no input signal applied. (Note that this is measured without any mute function enabled.)
2.
Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative
to the amplitude of the measured output signal.
Total Harmonic Distortion plus Noise (dB) – THD+N is the level of the rms value of the sum of harmonic distortion
products plus noise in the specified bandwidth relative to the amplitude of the measured output signal.
Dynamic range (dB) - DNR is a measure of the difference between the maximum full scale output signal level and the
sum of all harmonic distortion products plus noise with a low level input signal applied. Typically, an input signal level
60dB below full scale is used.
Channel separation (L/R) (dB) – left-to-right and right-to-left channel separation is the measured signal level in the
idle channel at the test signal frequency relative to the signal level at the output of the active channel. The active
channel is configured and supplied with an appropriate input signal to drive a full scale output, with signal measured
at the output of the associated idle channel.
3.
4.
5.
6.
Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with
mute applied.
7.
All performance measurements carried out with 20kHz low pass filter and, where noted, an A-weighted filter. Failure to
use such a filter will result in higher THD and lower SNR 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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WM3100
Preliminary Technical Data
DEVICE DESCRIPTION
INTRODUCTION
The WM3100 is a high-performance stereo line driver designed for Digital televisions, DVD, Blu-ray,
set-top box and gaming applications. It is packaged in a 14-pin SOIC.
The device comprises two fixed gain analogue channels. Input signals up to 1VRMS are supported, in
single-ended or differential configurations. The output driver drives up to 2.1VRMS, assuming a 3.3V
supply.
The inputs and outputs to the WM3100 are ground-referenced; an integrated charge pump circuit
generates the required negative supply rail from the single VDD supply.
The analogue outputs can be muted under control of a digital logic input. The outputs can also be set
to a high impedance state, supporting applications where a common external connector is used as
an input and an output.
INPUT SIGNAL PATH
The WM3100 supports two line input channels, which can each be used in single-ended or
differential circuit configurations, as illustrated in Figure 1, Figure 2 and Figure 3. The signal gain is
6.4dB in each case.
The input capacitor must be correctly selected as it affects the low cut-off frequency of the input
circuit. A low cut-off frequency is desirable as it means that there is no significant filtering of the 20Hz
to 20kHz audio frequency bandwidth.
Typically, the 3dB cut-off frequency for the line input should be around 10Hz. The WM3100 input
impedance is 24kΩ (see “Electrical Characteristics”). Using the equations below, it follows that the
AC coupling capacitors should be approximately 1μF (which gives a 3dB cut-off frequency around
7Hz).
Figure 1 Single-Ended Line Input (Inverting)
Figure 2 Single-Ended Line Input (Non-Inverting)
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WM3100
Preliminary Technical Data
Figure 3 Differential Line Input
OUTPUT SIGNAL PATH
The WM3100 provides two line output channels, which each support a peak output voltage of ±2.97V
(6.4dBV or 2.1VRMS sine wave) when operating with a 3.3V supply.
The line outputs are ground-referenced, removing the requirement for DC-blocking capacitors.
The WM3100 provides an internal low-pass filter (LPF) on the output paths. It is also recommended
to connect an external analogue low pass filter to the output pins. This ensures that all out-of-band
noise is filtered, and improves the maximum load capacitance rating, as noted in the “Electrical
Characteristics”.
There are many suitable LPF architectures, but a simple RC filter is recommended, as illustrated in
Figure 4. The filter shown here has a -3dB cut-off frequency of approximately 105kHz, and a droop of
-0.15dB at 20kHz.
Figure 4 Line Output Low Pass Filter
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WM3100
Preliminary Technical Data
CHARGE PUMP
The WM3100 incorporates a charge pump circuit, which generates the negative supply rail for the
line output drivers. The charge pump is powered from VDD, and generates the negative supply
CPVOUTN. The switching clock for the charge pump is generated internally.
The external connections for the charge pump are illustrated in Figure 5. A fly-back capacitor is
connected between the CPCA and CPCB pins. A de-coupling capacitor is required on CPVOUTN.
Note that an input decoupling capacitor is also recommended on the VDD pin.
Figure 5 External Connections for Charge Pump
DIGITAL CONTROL INPUTS
The WM3100 supports two digital control inputs, as described below.
The OUTMODE pin selects between normal operation and high-impedance mute state. A logic ‘1’
input selects the high-impedance state, in which the outputs are muted and un-driven. This mode
enables the external connectors to support other functions without interference from the WM3100
drivers. A logic ‘0’ input selects normal operation.
The MUTE
¯ ¯ ¯ ¯ ¯ pin selects between normal operation and muted output mode. This is an “active low”
input pin. A logic ‘0’ input enables the mute function. A logic ‘1’ input selects normal operation.
Note that the MUTE
¯ ¯ ¯ ¯ ¯ pin has no function when the OUTMODE pin is asserted.
The digital control inputs are summarised in Table 1.
INPUT
OUTMODE
MUTE
¯¯¯¯¯
DESCRIPTION
Output mode control pin
0 = Normal operation
1 = High impedance mute state
Mute control (only valid when OUTMODE = 0)
0 = Output muted
1 = Normal operation
Table 1 Digital Control Inputs
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WM3100
Preliminary Technical Data
RECOMMENDED EXTERNAL COMPONENTS
AUDIO INPUT PATHS
A DC-blocking input capacitor is required on each input pin that is used. A single capacitor is
required for a single-ended connection; for differential connection, a capacitor is required on both
input pins. Unused input pins must be connected to ground.
For typical applications, a 1μF capacitor is recommended. Tantalum electrolytic capacitors are
particularly suitable as they offer high stability in a small package size.
AUDIO OUTPUT PATHS
An analogue low-pass filter is recommended on each line output. A simple RC filter comprising a
560Ω resistor and a 2.7nF capacitor is suitable. Ceramic capacitors with C0G / NP0 dielectric are
recommended.
POWER SUPPLY DECOUPLING
Power supply decoupling is required on VDD. A 4.7μF capacitor is recommended.
Decoupling capacitors should be placed as close as possible to the WM3100 device. The connection
between GND, the VDD decoupling capacitor and the main system ground should be made at a
single point as close as possible to the GND pin of the WM3100.
Due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the
selected components provide the required capacitance across the required temperature and voltage
ranges in the intended application. For most application the use of ceramic capacitors with capacitor
dielectric X5R is recommended.
CHARGE PUMP COMPONENTS
A fly-back capacitor is required between the CPCA and CPCB pins. The required capacitance is
2.2μF. A decoupling capacitor is required on CPVOUTN; the recommended value is 1μF.
The positioning of the charge pump capacitors is important, particularly the fly-back capacitor. The
use of short and wide PCB tracks for the fly-back capacitor connections will give best results due to
its low resistance. Both capacitors should be placed as close as possible to the WM3100.
Due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the
selected components provide the required capacitance across the required temperature and voltage
ranges in the intended application. For most application the use of ceramic capacitors with capacitor
dielectric X5R is recommended.
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WM3100
Preliminary Technical Data
RECOMMENDED EXTERNAL CONNECTIONS
The recommended external connections to the WM3100 are illustrated in Figure 6.
VDD Supply
VDD
CPCA
2.2 F
4.7 F
CPCB
GND
CPVOUTN
1 F
Digital Control Inputs
MUTE
OUTMODE
Line input 1
1 F
1 F
Line input 2
1 F
1 F
Line output 1
IN1P
WM3100
LINEOUT1
560Ω
IN1N
2.7nF
Line output 2
IN2P
LINEOUT2
560Ω
IN2N
2.7nF
LINEREF
Figure 6 Recommended External Connections
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WM3100
Preliminary Technical Data
PACKAGE DIMENSIONS
DM001.C
D: 14 PIN SOIC 3.9mm Wide Body
e
B
14
8
H
E
1
7
D
L
h x 45o
A1
-CA
α
C
0.10 (0.004)
A
A1
B
C
D
E
e
H
h
L
α
Dimensions
(mm)
MIN
MAX
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
8.55
8.75
3.80
4.00
1.27 BSC
5.80
6.20
0.25
0.50
0.40
1.27
o
o
0
8
REF:
JEDEC.95, MS-012
Symbols
SEATING PLANE
Dimensions
(Inches)
MIN
MAX
0.0532
0.0688
0.0040
0.0098
0.0130
0.0200
0.0075
0.0098
0.3367
0.3444
0.1497
0.1574
0.05 BSC
0.2284
0.2440
0.0099
0.0196
0.0160
0.0500
o
o
0
8
NOTES:
A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS (INCHES).
B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE.
C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.25MM (0.010IN).
D. MEETS JEDEC.95 MS-012, VARIATION = AB. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS.
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Preliminary Technical Data
WM3100
IMPORTANT NOTICE
Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale,
delivery and payment supplied at the time of order acknowledgement.
Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the
right to make changes to its products and specifications or to discontinue any product or service without notice. Customers
should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current.
Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty.
Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation.
In order to minimise risks associated with customer applications, the customer must use adequate design and operating
safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer
product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for
such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product.
Wolfson’s products are not intended for use in life support systems, appliances, nuclear systems or systems where
malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage.
Any use of products by the customer for such purposes is at the customer’s own risk.
Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other
intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or
services might be or are used. Any provision or publication of any third party’s products or services does not constitute
Wolfson’s approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document
belong to the respective third party owner.
Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is
accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is
not liable for any unauthorised alteration of such information or for any reliance placed thereon.
Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in
this datasheet or in Wolfson’s standard terms and conditions of sale, delivery and payment are made, given and/or
accepted at that person’s own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any
reliance placed thereon by any person.
ADDRESS:
Wolfson Microelectronics plc
26 Westfield Road
Edinburgh
EH11 2QB
United Kingdom
Tel :: +44 (0)131 272 7000
Fax :: +44 (0)131 272 7001
Email :: [email protected]
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