MIX3005 2X3W Class-D Amplifier with DC Volume Control and ...

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Description Features

The MIX3005 is is a high efficiency, 3W/channel ‹ Output Power
stereo class-D audio power amplifier with - 3W/ch into 4Ω at 5V
earphone amplifier. 64-step DC volume control - 1.7W/ch into 8Ω at 5V
minimizes external components and allows
speaker volume control and earphone volume ‹ Supply Voltage:2.5V to 5.5V
control. It offers low THD+N, to produce ‹ THD+N
high-quality sound reproduction. A Low noise,
filterless architecture eliminates the out filter, it 0.03% （VDD=5.0V, PO=1W, RL=4Ω）
required few external components for operation to ‹ Residual Noise
save the board space and cost.
The MIX3005 features shutdown and mute 80uVrms（VDD=5.0V, Av=6dB）
controls functions. High PSRR and differential ‹ High Efficiency up to 90%
architecture provide increased immunity to noise ‹ 64-step DC Volume Control
and RF rectification. ‹ Earphone Output Function
The MIX3005 is available in SSOP-24 PB-Free ‹ Short Circuit Protection
‹ Over Temperature Protection
package. .
Applications

‹ Portable DVD Players
‹ Notebook PC
‹ USB Speakers, Portable Speaker
‹ LCD TV/LCD Monitor

  Pin Configuration

Typical Application

     

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 1 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output
Block Diagram

 

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 2 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Pin Descriptions

Name Pin No. I/O Pin Description

1 OUTLP O Left Channel Positive Audio Output
2,3 PGNDL GND Left Channel Power Ground
4 OUTLN O Left Channel Negative Audio Output
5 PVDDL POWER Left Channel Power Supply
6 I Mute Control Input Pin（active low）
7 MUTE POWER Analog Supply Voltage Terminal
8 AVDD I Left Channel input
9 INL I Left earphone input
10 EINL I Input for controlling volume ramp rate (active high default)
11 FADE I DC volume control to set the gain
12 VOL O Left Earphone output
13 EOL O Right Earphone output
14 EOR IO Internal analog reference
15 VREF I Speaker/Earphone select(Default Low: Speaker active)
16 SEL I Right earphone input
17 EINR I Right Channel input
18 INR GND Analog Power Supply Ground
19 AGND I Shutdown Control Input Pin (active low)
20 POWER Right Channel Power Supply
21 SD O Right Channel Negative Audio Output
22,23 PVDDR GND Right Channel Power Ground
24 OUTRN O Right Channel Positive Audio Output
PGNDR
OUTRP  

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 3 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Ordering Information

Order Number Package Type Marking Packing
MIX3005 SSOP-24 MIX3005 Reel Tape
XXXXXXX
Tube

Absolute Maximum Ratings

(Over operating free-air temperature, unless otherwise noted)

VDD Supply voltage -0.3V to 6V
VI Input voltage -0.3V to VDD+0.3V
TA Operation free-air temperate range -40°C to 85°C
TJ Operation free-air junction temperature -40°C to 125°C
TSTG Storage temperature range -65°C to 150°C
TSLD Soldering temperature 300°C, 5sec

 

Recommended Operating Conditions

VDD Supply Voltage AVDD, PVDD MIN MAX UNIT

VIH Enable Input High Voltage VDD=5.0V 2.5 5.5 V
1.3 V
VIL Enable Input Low Voltage VDD=5.0V 0.35
1.3 V
VIH Mute Input High Voltage VDD=5.0V 0.35

VIL Mute Input Low Voltage VDD=5.0V

Thermal Information

Parameter Symbol Package MAX UNIT

Thermal Resistance (Junction to Ambient) θJA SSOP-24 96 °C/W

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 4 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Class-D Electrical Characteristics

(VDD =5V, Gain=23.6dB, RL=8Ω, T =25°C, unless otherwise noted.)

Symbol Parameter Test Conditions MIN TYP MAX UNIT

VIN Supply Power 2.5 - 5.5 V

THD+N=10%,f=1KHZ,RL=4Ω VDD=5.0V 3
VDD=3.6V W

THD+N=1%,f=1KHZ,RL=4Ω VDD=5.0V 1.55
THD+N=10%,f=1KHZ RL=8Ω 2.4
PO Class D VDD=3.6V
Output Power VDD=5.0V W
VDD=3.6V 1.25
1.7

W
0.9

THD+N=1%,f=1KHZ,RL=8Ω VDD=5.0V 1.4
VDD=3.6V W
Total Harmonic VDD=5.0V, PO=1W, RL=4Ω f=1KHz
THD+N VDD=3.6V, PO=0.5W, RL=4Ω f=1KHz 0.72
VDD=5.0V, PO=0.5W, RL=8Ω 0.03
Distortion Plus Noise VDD=3.6V, PO=0.25W, RL=8Ω f=1KHz
%
GV Class D Gain VDD=4.2V ±200mVp-p 0.03
PSRR Power Supply Ripple F=1KHz 0.02

Rejection %
0.03
23.6 dB

65 dB

CS Crosstalk VDD=5.0V,PO=0.5W, RL=8Ω, f=1KHz -95 dB
GV=23.6dB

SNR Signal-to-Noise VDD=5.0V,Vo rms=1V, f=1KHz -76 dB
Ratio GV=23.6dB

Vn Output Noise VDD=5.0V,Input AC-GND A-weighting 150 μV

No A-weighting 200

Dyn Dynamic range VDD=5.0V,THD=1% f=1KHz -84 dB

η Efficiency RL=8Ω, Po=1.6W f=1KHz 90
RL=4Ω, Po=2.8W %
IQ Quiescent Current No Load
IMUTE Muting Current VDD=5.0V VMUTE=0.3V 83
VDD=3.6V 7.6
VDD=5.0V
mA
6
4.6 mA

ISD Shutdown Current VDD=2.5V to 5.5V VSD=0.3V 1 μA
Output Offset VIN=0V, VDD=5V 10 mV

Vos
Voltage

Fosc Oscillator frequency 400 khz

Tst setup time Bypass capacitor =1uF 380 mS

OTP Over Temperature No Load , VDD=5.0V 160
OTH Protection Junction Temperature
°C
Over Temperature
Hysterisis 30

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 5 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Earphone Electrical Characteristics

(VDD =5V, Gain=5.3dB, RL=32Ω, T =25°C, unless otherwise noted.)

Symbol Parameter Test Conditions MIN TYP MAX UNIT
65 mW
PO Output Power THD+N=1%,RL=32Ω VDD=5.0V 0.02 %
THD+N Total Harmonic PO=30mW,RL=32Ω f=1KHz 5.3 dB
Distortion Plus Noise 70 dB

GV Earphone Gain VDD=4.2V ±200mVp-p f=1KHz dB
PSRR Power Supply Ripple F=1KHz
dB
Rejection μV
mA
CS Crosstalk VDD=5.0V,PO=0.5W, f=1KHz -80 μA
SNR RL=8Ω, GV=25dB V
Vn Signal-to-Noise Ratio f=1KHz -92 mS
Output Noise VDD=5.0V,Vorms=1V, A-weighting 24
GV=25dB 5.8 °C
4.5
VDD=5.0V,Input AC-GND
VDD/2
IQ Quiescent Current VDD=5.0V No Load 380
VDD=3.6V 160

ISD Shutdown Current VDD=2.5V to 5.5V VSD=0.3V 1

Vos Output DC Voltage No Load

Tst setup time Bypass capacitor =1uF

OTP Over Temperature No Load, Junction VDD=5.0V
OTH Protection Temperature
30
Over Temperature
Hysterisis

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 6 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Class-DTypical Operating Characteristics

(VDD =5V, Gain=23.6dB, RL =8Ω, T =25°C, unless otherwise noted.)

THD+N vs Output Power THD+N vs Output Power

20 20

10 RL=4ohm Gain=23.6dB 10 RL=8ohm Gain=23.6dB
5 VDD= 3.6V , 4.2V , 5V  5 VDD= 3.6V , 4.2V , 5V 

2 2
1 1
% 0.5 % 0.5

0.2 0.2
0.1 0.1
0.05 0.05

0.02 10m 100m 500m 24 0.02 20m 100m 500m 2
0.01 W 0.01 W

1m 1m 2m 5m

THD+N VS FREQUENCY Cross-Talk T

1 -50TTTTTTTTTT T TTTT TT TTTT T
RL=8ohm Gain=23.6dB
RL=8ohm Gain=23.6dB
0.5 Vo=1Vp‐p 
-60 Cin=0.1uF
0.2
-70
% 0.1 d

0.05 B R to L L to R 

-80

0.02 -90

0.01 5k 20k -100
30 50 100 200 500 1k 2k 20 50 100 200 500 1k 2k 5k 20k
Hz Hz

NOISE FLOOR FFT Frequency Response

-50 +24
RL=8ohm Gain=23.6dB +22

-60

-70 d RL=8ohm Gain=23.6dB
B +20
d -80 g Vo=1Vp‐p 
B
V -90 +18
A
-100
+16
-110

-120 +14
10 20 50 100 200 500 1k 2k 5k 20k 20 50 100 200 500 1k 2k 5k 20k

Hz Hz

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 7 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

Earphone Typical Operating Characteristics

(VDD =5V, Gain=5.3dB, RL =32Ω, T =25°C, unless otherwise noted.)

THD+N vs Output Power THD+N vs Output Power

10 10

5 RL=16ohm Gain=5.3dB 5 RL=32ohm Gain=5.3dB
2 VDD= 3.6V , 4.2V , 5V  VDD= 3.6V , 4.2V , 5V 

2

11

0.5 0.5
% %

0.2 0.2

0.1 0.1

0.05 0.05

0.02 0.02 100m
0.01 0.01

10u 100u 1m 10m 100m 10u 100u 1m 10m
W W

THD+N VS FREQUENCY Frequency Response
1 +5
0.5 RL=32ohm Gain=5.3dB
+4
Vo=1Vp‐p 
0.2 d +3
B
0.1 g
% 0.05
A
+2

0.02 50 100 200 500 1k 2k 5k 20k +1 RL=32ohm Gain=4.8dB
0.01 Hz -0 Cin=1uF, Cout=470uF
0.005
0.003 20 50 100 200 500 1k 2k 5k 20k
Hz
20

NOISE FLOOR FFT
-50

-60 RL=32ohm Gain=5.3dB

-70

d -80
B -90
V -100

-110
-120

-130 50 100 200 500 1k 2k 5k 20k
10 20 Hz

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 8 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output
DC Volume Control

STEP GAIN(dB) GAIN(dB) STEP GAIN(dB) GAIN(dB)
Class D Earphone Class D Earphone
1 33
2 ‐64.0 ‐80.0 34 13.1 ‐0.9
3 ‐40.6 ‐40.6 35 13.7 ‐0.5
4 ‐34.7 ‐34.5 36 14.3 ‐0.1
5 ‐28.5 ‐32.5 37 14.9 0.3
6 ‐22.3 ‐30.6 38 15.5 0.7
7 ‐16.2 ‐28.6 39 16.1 1.1
8 ‐14.2 ‐26.6 40 16.7 1.4
9 ‐12.2 ‐24.6 41 17.3 1.8
10 ‐10.1 ‐22.6 42 17.9 2.2
11 ‐8.1 ‐20.5 43 18.3 2.4
12 ‐6.1 ‐18.5 44 18.7 2.6
13 ‐5.1 ‐17.5 45 19.1 2.8
14 ‐4.1 ‐16.5 46 19.5 3.0
15 ‐3.1 ‐15.4 47 19.8 3.2
16 ‐2.1 ‐14.4 48 20.1 3.3
17 ‐1.1 ‐13.4 49 20.4 3.5
18 ‐0.1 ‐12.4 50 20.6 3.7
19 0.9 ‐11.4 51 20.9 3.9
20 1.9 ‐10.4 52 21.2 4.0
21 2.9 ‐9.4 53 21.5 4.1
22 3.9 ‐8.7 54 21.7 4.2
23 4.7 ‐8.0 55 21.9 4.3
24 5.5 ‐7.3 56 22.1 4.4
25 6.3 ‐6.6 57 22.2 4.5
26 7.1 ‐5.9 58 22.4 4.6
27 7.9 ‐5.2 59 22.6 4.7
28 8.7 ‐4.5 60 22.8 4.8
29 9.5 ‐3.8 61 23.0 4.9
30 10.3 ‐3.1 62 23.2 5.0
31 11.1 ‐2.4 63 23.3 5.1
32 11.9 ‐1.7 64 23.5 5.2
12.5 ‐1.3 23.6 5.3

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 9 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output
Application Information

Mute Operation tolerance on this trip point from device to device.
Once the die temperature exceeds the thermal set
The MUTE pin is an input for controlling the point, the device enters into the shutdown state
and the outputs are disabled. This is not a latched
output state of the MIX3005. A logic high on this fault. The thermal fault is cleared once the
pin enables the outputs, a logic low on this pin temperature of the die is reduced by 25°C. The
disables the outputs. The terminal may be used as device begins normal operation at this point with
a quick disable/enable of the outputs when no external system intervention.
changing channels between different audio
Decoupling Capacitor (Cs)
sources. The MUTE pin can be left floating due
The MIX3005 is a high-performance Class-D
to the internal pull-up. audio amplifier that requires adequate power
supply decoupling to ensure the efficiency is high
Shutdown operation and total harmonic distortion (THD) is low. For
higher frequency transients, spikes, or digital hash
The MIX3005 employs a shutdown mode of on the line a good low equivalent series resistance
operation designed to reduce supply current to the (ESR) ceramic capacitor, typically 1μF, placed as
absolute minimum level during periods of nonuse close as possible to the device PVDD lead works
best. Placing this decoupling capacitor close to
for power conservation. The SHDN input terminal the MIX3005 is important for the efficiency of the
Class-D amplifier, because any resistance or
should be held high during normal operation when inductance in the trace between the device and
the capacitor can cause a loss in efficiency. For
the amplifier is in use. The SHDN pin can be left filtering lower-frequency noise signals, a 4.7μF or
greater capacitor placed near the audio power
floating due to the internal pull-up. amplifier would also help, but it is not required in
most applications because of the high PSRR of
Under Voltage Lock-out (UVLO) this device.

The MIX3005 incorporates circuitry designed to Input Capacitors (Ci )
detect low supply voltage. When the supply
voltage drops to 1.8V or below, the MIX3005 The MIX3005 does not require input coupling
outputs are disabled, and the device comes out of capacitors if the design uses a differential source
this state and starts to normal function when VDD that is biased from 0.5V to VDD-0.8V. If the input
≧2.0V. signal is not biased within the recommended
common-mode input range, if high pass filtering is
Short -Circuit Protection needed, or if using a single-ended source, input
coupling capacitors are required.
The MIX3005 has short circuit protection circuitry The input capacitors and input resistors from a
on the outputs to prevent damage to the device high-pass filter with the corner frequency, fc,
during output-to-output shorts, output-to-GND and determined in below equation
output-to-GND short occurs. When a short circuit
is detected on the outputs, the part immediately The value of input capacitor is important to
disables the drive. This is an unlatched fault.
Normal operation is restored when the fault is
removed.

Thermal Protection

Thermal protection on the MIX3005 prevents
damage to the device when the internal die
temperature exceeds 160°C. There is a ±20°C

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 10 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

consider as it directly affects the bass (low A logic High on this terminal will set the amplifier in

frequency) performance of the circuit. Speaker in fade mode. During power-up or recovery from the

wireless phones cannot usually respond well to shutdown state, the volume is smoothly ramped

low frequencies, so the corner frequency can be up from the mute state to the desired volume set

set to block low frequencies in this application. Not by the voltage on the volume control terminal. A

using input capacitors can increase out offset. logic low on this pin disables the volume fade

Below equation is used to solve for the input effect during transitions to and from the shutdown

coupling capacitance. state and during power-up. During power-up or

recovery from the shutdown state (a logic high is

applied to the terminal), the transition from the

If the corner frequency is within the audio band, mute state, -75dB, to the desired volume setting is

the capacitors should have tolerance of ±10% or less than 1ms.

better, because any mismatch in capacitance

causes an impedance mismatch at the corner Filter Free Operation and Ferrite Bead

frequency and below. Filters

A ferrite bead filter can often be used if the design

Analog Reference Bypass Capacitor is failing radiated emissions without an LC filter

(CREF ) and the frequency sensitive circuit is greater than
1MHz. This filter functions well for circuits that just
The Analog Reference Bypass Capacitor (CREF) is

the most critical capacitor and serves several have to pass FCC and CE because FCC and CE

important functions. During start-up or recovery only test radiated emissions greater than 30MHz.

from shutdown mode, C determines the rate at When choosing a ferrite bead, choose one with

which the amplifier starts up. The second function high impedance at high frequencies, and very low

is to reduce noise caused by the power supply impedance at low frequencies. In addition, select

coupling into the output drive signal. This noise is a ferrite bead with adequate current rating to

from the internal analog reference to the amplifier, prevent distortion of the output signal.

which appears as degraded PSRR and THD+N. Use an LC output filter if there are low frequency

A ceramic bypass capacitor (CBYP ) with values of (< 1 MHz) EMI sensitive circuits and/or there are

0.47μF to 1.0μF is recommended for the best long leads from amplifier to speaker.

THD and noise performance. Increasing the

bypass capacitor reduces clicking and popping

noise from power on/off and entering and leaving

shutdown.

Fade Operation

The FADE terminal is a logic input that controls

the operation of the volume control circuitry

during transitions to and from the shutdown state

and during power-up. Ferrite Bead Filter to reduce EMI

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 11 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output
Outline Dimension
SSOP-24

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 12 / 13 

Rev 1.1 May .2011

MIX3005
2X3W Class-D Amplifier
with DC Volume Control and Earphone Output

IMPORTANT NOTICE
Shanghai Mixinno Microelectronics and its subsidiaries (Mixinno) reserves the right to make
corrections, modifications, enhancements, improvements, and other changes to its products and to
this document without any notice. The information contained in this document has been carefully
checked and is believed. However, Mixinno shall assume no responsibilities for inaccuracies and
make no commitment to update or to keep the information contained in this document.
Mixinno products are designed only for commercial and normal industrial applications. And are not
authorized for use in life support equipment where a failure of which could lead to death, personal
injury or environmental or property damage. Use of the products in such application is at the
customer’s own risk and expense. Mixinno is not responsible or liable for any incidental which may
result from misapplication or improper use or operation of the product.
It is an unfair and deceptive business practice that resale of Mixinno products or services with
statements different from or beyond the parameters stated by Mixinno for that product or service.
Mixinno is not responsible or liable for any such statements.
There are some probabilities with the products fail. However, Mixinno does its best to improve the
quality and reliability of the products.

Shanghai Mixinno Microelectronics Co., Ltd                                                                                                                 13 / 13 

Rev 1.1 May .2011