How it Works
Maxim Integrated
Loading...
MAX9778
User Manual
27 pgs1.23 Mb0

Maxim Integrated MAX9778 User Manual

General Description
The MAX9777/MAX9778 combine a stereo 3W bridge­tied load (BTL) audio power amplifier, stereo single­ended (SE) headphone amplifier, headphone sensing, and a 2:1 input multiplexer all in a tiny 28-pin thin QFN package. These devices operate from a single 4.5V to
5.5V supply and feature an industry-leading 100dB PSRR, allowing these devices to operate from noisy supplies without the addition of a linear regulator. An ultra-low 0.002% THD+N ensures clean, low-distortion amplification of the audio signal. Click-and-pop sup­pression minimizes audible transients on power and shutdown cycles. Power-saving features include low 4mV V
OS
(minimizes DC current drain through the speakers), low 13mA supply current, and a 10µA shut­down mode. A MUTE function allows the outputs to be quickly enabled or disabled.
A headphone sense input detects the presence of a headphone jack and automatically configures the amplifiers for either speaker or headphone mode. In speaker mode, the amplifiers can deliver up to 3W of continuous average power into a 3Ω load. In head­phone mode, the amplifier can deliver up to 200mW of continuous average power into a 16Ω load. The gain of the amplifiers is externally set, allowing maximum flexi­bility in optimizing output levels for a given load. The amplifiers also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The multiplexer can also be used to compensate for limitations in the frequency response of the loud speakers by selecting an external equalizer network. The various functions are controlled by either an I2C-compatible (MAX9777) or simple parallel control interface (MAX9778).
The MAX9777/MAX9778 are available in a thermally efficient 28-pin thin QFN package (5mm x 5mm x
0.8mm). These devices have thermal-overload protec­tion (OVP) and are specified over the extended -40°C to +85°C temperature range.
Features
♦ Industry-Leading, Ultra-High 100dB PSRR ♦ 3W BTL Stereo Speaker Amplifier ♦ 200mW Stereo Headphone Amplifier ♦ Low 0.002% THD+N ♦ Click-and-Pop Suppression ♦ ESD-Protected Outputs ♦ Low Quiescent Current: 13mA ♦ Low-Power Shutdown Mode: 10µA ♦ MUTE Function ♦ Headphone Sense Input ♦ Stereo 2:1 Input Multiplexer ♦ Optional 2-Wire, I
2
C-Compatible or Parallel
Interface
♦ Tiny 28-Pin Thin QFN (5mm
x 5mm x 0.8mm)
Package
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
________________________________________________________________
Maxim Integrated Products
1
SE/ BTL
SINGLE SUPPLY
4.5V TO 5.5V
I
2
C-
COMPATIBLE
MAX9777
LEFT IN1
LEFT IN2
RIGHT IN1
RIGHT IN2
CONTROL
Simplified Block Diagram
Ordering Information
19-0509; Rev 0; 4/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
µ
PART
CONTROL
INTERFACE
PIN­PACKAGE
PK G
C O D E
MAX9777ETI+
T2855-6
MAX9778ETI+
Parallel
T2855-6
Pin Configurations and Functional Diagrams appear at end of data sheet.
Note: All devices are specified over the -40°C to +85°C operat­ing temperature range.
+Denotes lead-free package. *EP = Exposed paddle.
Notebooks
Portable DVD Players
Tablet PCs
PC Audio Peripherals
Camcorders
Multimedia Monitor
Applications
I2C Compatible 28 Thi n QFN - E P *
28 Thi n QFN - E P *
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
2
______________________________________________________________________________________________________________________________________________________________________________
AABBSSOOLLUUTTEE MMAAXXIIMMUUMM RRAATTIINNGGSS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND ...........................................................................+6V
PV
DD
to VDD.......................................................................±0.3V
PGND to GND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (V
DD
+ 0.3V) Continuous Input Current (into any pin except power-supply
and output pins) ...............................................................±20mA
OUT__ Short Circuit to GND, V
DD
..........................................10s
Short Circuit Between OUT_+ and OUT_- .................Continuous
Continuous Power Dissipation (T
A
= +70°C) 28-Pin TQFN, Multilayer Board
(derate 34.5mW/°C above +70°C)..........................2758.6mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
Supply Voltage Range VDD/PVDDInferred from PSRR test 4.5 5.5 V
Quiescent Supply Current (I
Shutdown Current I
Switching Time t
Turn-On Time t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VDD
+ I
PVDD
)
I
DD
SHDN
SW
ON
Thermal Shutdown Threshold +160
Thermal Shutdown Hysteresis 15
OUTPUT AMPLIFIERS (SPEAKER MODE, HPS = GND)
Output Offset Voltage V
Power-Supply Rejection Ratio (Note 2)
Total Harmonic Distortion Plus Noise
OS
PSRR
OUT
THD+N
Signal-to-Noise Ratio SNR RL = 8Ω, P
Slew Rate SR 1.6 V/µs
Maximum Capacitive Load Drive C
L
Crosstalk fIN = 10kHz 73 dB
Click/Pop Level K
CP
BTL mode, HPS = 0V, MAX9777/MAX9778 13 32
Single-ended mode, HPS = V
DD
SHDN = GND 10 50 µA
Gain or input switching 10 µs
C
= 1µF 300
BIAS
C
= 0.1µF 30
BIAS
OUT_+ - OUT_-, AV = 1V/V ±4 ±32 mV
VDD = 4.5V to 5.5V 75 100
f = 1kHz, V
f = 20kHz, V
fIN = 1kHz, THD+N < 1%, T
= +25°C
A
f
= 1kHz, BW =
IN
22Hz to 22kHz
= 200mV
RIPPLE
RIPPLE
= 200mV
P-P
P-P
RL = 8Ω 1.4
RL = 4Ω 2.6Output Power P
R
= 3Ω 3
L
P
= 1W, RL = 8Ω 0.005
OUT
P
= 2W, RL = 4Ω 0.01
OUT
= 1W, BW = 22Hz to 22kHz 95 dB
OUT
No sustained oscillations 1 nF
Peak voltage, A-weighted,
Into shutdown -50
32 samples per second (Notes 2, 6)
Out of shutdown -65
718
82
70
mA
ms
o
C
o
C
dB
W
%
dBV
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
______________________________________________________________________________________________________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
OUTPUT AMPLIFIERS (HEADPHONE MODE, HPS = VDD)
Power-Supply Rejection Ratio (Note 2)
Output Power P
Total Harmonic Distortion Plus Noise
Signal-to-Noise Ratio SNR
Slew Rate SR 1.8 V/µs
Maximum Capacitive Load Drive C
Crosstalk fIN = 10kHz 78 dB
BIAS VOLTAGE (BIAS)
BIAS Voltage V
Output Resistance R
DIGITAL INPUTS (MUTE, SHDN, HPS_EN, GAINA/B, IN1111/2)
Input-Voltage High V
Input-Voltage Low V
Input Leakage Current I
HEADPHONE SENSE INPUT (HPS)
Input-Voltage High V
Input-Voltage Low V
Input Leakage Current I
Click/Pop Level K
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PSRR
OUT
THD+N
L
BIAS
BIAS
IH
IL
IN
IH
IL
IN
CP
VDD = 4.5V to 5.5V 75 106
f = 1kHz, V
f = 20kHz, V
fIN = 1kHz, THD+N < 1%, T
A
fIN = 1kHz, BW = 22Hz to 22kHz
R
= 32Ω, BW = 22Hz to 22kHz,
L
= 1V
V
OUT
No sustained oscillations 2 nF
Peak voltage, A-weighted, 32 samples per second (Notes 2, 4)
= 200mV
RIPPLE
RIPPLE
= +25°C
RMS
= 200mV
P-P
P-P
RL = 32Ω 88
R
= 16Ω 200
L
P
= 60mW,
OUT
= 32Ω
R
L
P
= 125mW,
OUT
= 16Ω
R
L
Into shutdown -70
Out of shutdown -52
0.002
0.002
2.35 2.5 2.65 V
2V
0.9 x V
DD
88
76
92 dB
50 kΩ
0.8 V
±1µA
0.7 x V
DD
±1µA
dB
mW
%
V
V
dBV
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
4
______________________________________________________________________________________________________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design. Note 2: Inputs AC-coupled to GND. Note 3: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s
falling edge.
Note 4: C
B
= total capacitance of one of the bus lines in picofarads. Device tested with CB= 400pF. 1kΩ pullup resistors connected
from SDA/SCL to V
DD
.
Note 5: Input filters on SDA, SCL, and ADD suppress noise spikes of less than 50ns. Note 6: Headphone mode testing performed with 32Ω resistive load connected to GND. Speaker mode testing performed with 8Ω
resistive load connected to GND. Mode transitions are controlled by SHDN. KCP level is calculated as 20log[(peak voltage during mode transition, no input signal)/1V
RMS
]. Units are expressed in dBV.
2-WIRE SERIAL INTERFACE (SCL, SDA, ADD, INT) (MAX9777)
Input-Voltage High V
Input-Voltage Low V
Input Hysteresis 0.2 V
Input High Leakage Current I
Input Low Leakage Current I
Input Capacitance C
Output-Voltage Low V
Output Current High I
TIMING CHARACTERISTICS (MAX9777)
Serial Clock Frequency f
Bus Free Time Between STOP and START Conditions
START Condition Hold Time t
START Condition Setup Time t
Clock Period Low t
Clock Period High t
Data Setup Time t
Data Hold Time t
Receive SCL/SDA Rise Time t
Receive SCL/SDA Fall Time t
Transmit SDA Fall Time t
Pulse Width of Suppressed Spike
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IH
IL
IH
IL
IN
OL
OH
SCL
t
BUF
HD:STA
SU:STA
LOW
HIGH
SU:DAT
HD:DAT
r
f
f
t
SP
VIN = 5V ±1µA
VIN = 0V ±1µA
IOL = 3mA 0.4 V
VOH = 5V 1 µA
(Note 3) 0 0.9 µs
(Note 4)
(Note 4)
(Note 4)
(Note 5) 50 ns
2.6 V
1.3 µs
0.6 µs
0.6 µs
1.3 µs
0.6 µs
100 ns
20 +
0.1C
B
20 +
0.1C
B
20 +
0.1C
B
10 pF
0.8 V
400 kHz
300 ns
300 ns
250 ns
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
5
Typical Operating Characteristics
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
0.1
P
P
= 500mW
OUT
THD+N (%)
0.01
= 2W
OUT
0.001 10 100k
= 1W
OUT
P
= 2.5WP
OUT
FREQUENCY (Hz)
10k1k100
RL = 3
= 2V/V
A
V
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
0.1
P
= 250mW
P
OUT
THD+N (%)
0.01
P
= 1W
OUT
0.001 10 100k
= 500mW
OUT
P
OUT
FREQUENCY (Hz)
= 2W
RL = 4Ω A
10k1k100
= 4V/V
V
MAX9777/78 toc01
MAX9777/78 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
1
0.1
THD+N (%)
0.01
0.001 10 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
1
0.1
THD+N (%)
0.01
0.001 10 100k
vs. FREQUENCY (SPEAKER MODE)
RL = 3Ω A
P
P
OUT
= 500mW
P
= 2W
OUT
= 1W
OUT
P
= 2.5W
OUT
FREQUENCY (Hz)
10k1k100
vs. FREQUENCY (SPEAKER MODE)
RL = 8Ω A
P
= 250mW
OUT
P
OUT
P
OUT
P
= 1W
FREQUENCY (Hz)
= 500mW
= 1.2W
OUT
10k1k100
= 4V/V
V
= 2V/V
V
MAX9777/78 toc02
THD+N (%)
MAX9777/78 toc05
THD+N (%)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
0.1
P
= 250mW
OUT
0.01
P
OUT
0.001 10 100k
= 1W
P
OUT
P
FREQUENCY (Hz)
= 500mW
= 2W
OUT
RL = 4Ω A
V
10k1k100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
0.1
P
= 250mW
OUT
0.01
P
OUT
0.001 10 100k
= 1W
FREQUENCY (Hz)
P
OUT
P
OUT
= 500mW
= 1.2W
10k1k100
RL = 8Ω A
= 2V/V
= 4V/V
V
MAX9777/78 toc03
MAX9777/78 toc06
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 2V/V
= 3Ω
R
L
10
1
THD+N (%)
0.1
0.01
0.001 04
f = 10kHz
f = 20Hz
f = 1kHz
OUTPUT POWER (W)
321
MAX9777/78 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 4V/V
= 3Ω
R
L
10
1
THD+N (%)
0.1
0.01
0.001
f = 1kHz
f = 20Hz
04
f = 10kHz
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 2V/V
= 4Ω
R
L
10
MAX9777/78 toc08
1
THD+N (%)
0.1
0.01
0.001
321
f = 1kHz
0 3.5
f = 10kHz
f = 20Hz
2.5 3.02.01.51.00.5
OUTPUT POWER (W)
MAX9777/78 toc09
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
6
______________________________________________________________________________________________________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 4V/V
= 4Ω
R
L
10
1
THD+N (%)
0.1
0.01
0.001 0 3.5
OUTPUT POWER vs. AMBIENT TEMPERATURE
f = 10kHz
f = 1kHz
f = 20Hz
2.5 3.02.01.51.00.5
OUTPUT POWER (W)
(SPEAKER MODE)
4
THD+N = 10%
3
THD+N = 1%
2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 2V/V
= 8Ω
R
L
10
MAX9777/78 toc10
1
f = 10kHz
THD+N (%)
0.1
f = 1kHz
0.01
0.001
f = 20Hz
0 2.0
OUTPUT POWER (W)
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
4
MAX9777/78 toc13
3
2
THD+N = 10%
THD+N = 1%
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 4V/V
= 8Ω
R
L
10
MAX9777/78 toc11
1
THD+N (%)
0.1
0.01
1.51.00.5
0.001 0 2.0
OUTPUT POWER vs. AMBIENT TEMPERATURE
2.0
THD+N = 10%
MAX9777/78 toc14
1.5
THD+N = 1%
1.0
MAX9777/78 toc12
f = 10kHz
f = 1kHz
f = 20Hz
1.51.00.5
OUTPUT POWER (W)
(SPEAKER MODE)
MAX9777/78 toc15
OUTPUT POWER (W)
1
f = 1kHz
= 3Ω
R
L
0
-40 85
AMBIENT TEMPERATURE (°C)
603510-15
OUTPUT POWER (W)
1
f = 1kHz
= 4Ω
R
L
0
-40 85
AMBIENT TEMPERATURE (°C)
603510-15
OUTPUT POWER vs. LOAD RESISTANCE
(SPEAKER MODE)
5
4
3
2
OUTPUT POWER (W)
1
0
1 100k
THD+N = 10%
THD+N = 1%
LOAD RESISTANCE (Ω)
f = 1kHz
MAX9777/78 toc16
10k1k10010
1.6
1.4
1.2
1.0
0.8
0.6
POWER DISSIPATION (W)
0.4
0.2
0
OUTPUT POWER (W)
0.5
f = 1kHz
= 8Ω
R
L
0
-40 85
POWER DISSIPATION vs. OUTPUT POWER
(SPEAKER MODE)
0
OUTPUT POWER (W)
AMBIENT TEMPERATURE (°C)
MAX9777/78 toc17
RL = 4Ω f = 1kHz
2.50.5 1.0 1.5 2.0
603510-15
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
40
V
= 200mV
RIPPLE
50
60
70
PSRR (dB)
80
90
100
10 100k
P-P
FREQUENCY (Hz)
ENTERING SHUTDOWN (SPEAKER MODE)
V
DD
2V/div
OUT_+ AND OUT_-
1V/div
10k1k100
MAX9777/78 toc20
MAX9777/78 toc18
CROSSTALK (dB)
-100
-110
-120
SHDN
2V/div
OUT_+ AND OUT_-
1V/div
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
-40
VIN = 200mV
P-P
RL = 8Ω
-50
-60
-70
-80
-90
RIGHT TO LEFT
LEFT TO RIGHT
10 100k
FREQUENCY (Hz)
EXITING SHUTDOWN (SPEAKER MODE)
10k1k100
MAX9777/78 toc21
MAX9777/78 toc19
OUT_+ - OUT_-
200mV/div
0.1
0.01
THD+N (%)
0.001
0.0001
OUT_+ - OUT_-
500mV/div
400ms/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
1
P
= 25mW
OUT
P
OUT
10 100k
= 100mW
P
OUT
FREQUENCY (Hz)
= 50mW
P
OUT
RL = 16Ω A
= 150mW
10k1k100
= 1V/V
V
MAX9777/78 toc22
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
1
0.1
P
= 25mW
OUT
0.01
THD+N (%)
P
0.001
0.0001
= 100mW
OUT
10 100k
100ms/div
P
= 50mW
OUT
P
OUT
FREQUENCY (Hz)
RL = 16Ω A
= 150mW
10k1k100
= 2V/V
V
MAX9777/78 toc23
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
8
______________________________________________________________________________________________________________________________________________________________________________
E
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc25
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001 10 100k
RL = 32Ω A
V
= 2V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc26
OUTPUT POWER (mW)
THD+N (%)
25020015010050
0.01
0.001
10
1
0.1
100
0.0001 0 300
AV = 1V/V R
L
= 16Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc27
OUTPUT POWER (mW)
THD+N (%)
25020015010050
0.01
0.001
10
1
0.1
100
0.0001 0 300
AV = 2V/V R
L
= 16Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc24
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001
10 100k
RL = 32Ω A
V
= 1V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
OUTPUT POWER vs. AMBIENT TEMPERATURE
300
250
200
150
100
OUTPUT POWER (mW)
50
0
-40 85
(HEADPHONE MODE)
THD+N = 10%
THD+N = 1%
f = 1kHz
= 16Ω
R
L
AMBIENT TEMPERATURE (°C)
603510-15
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
AV = 1V/V
= 32Ω
R
L
10
1
0.1
THD+N (%)
0.01
0.001
0.0001 0 125
f = 20Hz
OUTPUT POWER (mW)
OUTPUT POWER vs. AMBIENT TEMPERATUR
(HEADPHONE MODE)
150
THD+N = 10%
125
MAX9777/78 toc30
100
THD+N = 1%
75
50
OUTPUT POWER (mW)
25
f = 1kHz
= 32Ω
R
L
0
-40 85
AMBIENT TEMPERATURE (°C)
f = 1kHz
f = 10kHz
100755025
603510-15
100
MAX9777/78 toc28
THD+N (%)
0.01
0.001
0.0001
600
500
MAX9777/78 toc331
400
300
200
OUTPUT POWER (mW)
100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
AV = 2V/V
= 32Ω
R
L
10
1
0.1
0 125
f = 1kHz
f = 20Hz
OUTPUT POWER (mW)
f = 10kHz
100755025
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
f = 1kHz
THD+N = 10%
THD+N = 1%
0
1 10k
LOAD RESISTANCE (Ω)
1k10010
MAX9777/78 toc29
MAX9777/78 toc32
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc35
FREQUENCY (Hz)
PSRR (dB)
10k1k100
90
80
70
60
50
40
100
10 100k
V
RIPPLE
= 200mV
P-P
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9777/78 toc36
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-110
-100
-90
-80
-70
-60
-50
-40
-120 10 100k
VIN = 200mV
P-P
RL = 16Ω
RIGHT TO LEFT
LEFT TO RIGHT
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc33
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
50 100 150 200
20
40
60
80
100
120
0
0
RL = 16Ω f = 1kHz
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc34
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
10020 40 60 80
10
20
30
40
50
60
70
0
0
RL = 32Ω f = 1kHz
EXITING SHUTDOWN (HEADPHONE MODE)
SHDN
2V/div
OUT_+
1V/div
MAX9777/78 toc37
SHDN
2V/div
OUT_+
1V/div
HP JACK
100mV/div
HP JACK
200mV/div
RL = 16Ω INPUT AC-COUPLED TO GND
100ms/div
SUPPLY CURRENT vs. SUPPLY VOLTAGE
ENTERING SHUTDOWN (HEADPHONE MODE)
100ms/div
MAX9777/78 toc38
25
20
15
10
SUPPLY CURRENT (mA)
5
0
4.50 5.50
(SPEAKER MODE)
TA = +85°C
MAX9777/78 toc39
TA = +25°C
TA = -40°C
5.255.004.75
SUPPLY VOLTAGE (V)
Loading...
+ 18 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use