19-3666; Rev 0; 9/05
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
General Description
The MAX9752/MAX9753/MAX9754 combine a high-effi-
ciency, filterless, stereo Class D audio power amplifier
with a DirectDrive™ headphone amplifier in a single
device. The Class D amplifier operates from a single
4.5V to 5.5V supply and provides 2.2W per channel into
a 4Ω load. The headphone amplifier operates from a
single 3V to 5.5V supply, and uses Maxim’s DirectDrive
architecture to produce a ground-referenced output
from a single supply.
The MAX9754 features a Class D stereo speaker ampli-
fier and headphone driver. The MAX9752 adds an ana-
log volume control and a BEEP input. The MAX9753
adds a stereo 2:1 input multiplexer. All devices feature
logic-selectable gain, and a headphone sense input
that detects the presence of a headphone.
The MAX9752/MAX9753/MAX9754 come in 28-pin thin
QFN (5mm x 5mm x 0.8mm) packages, and are speci-
fied over the extended -40°C to +85°C temperature
range. For a pin-for-pin-compatible Class AB version of
these devices, refer to the MAX9750/MAX9751/
MAX9755 data sheet.
♦
PC2001 Compliant
♦
2.2W Class D Stereo Speaker Amplifier
♦
Pin-for-Pin Compatible with Class AB
MAX9750/MAX9751/MAX9755
♦
85% Efficiency (R
L
= 8Ω, P
OUT
= 1W)
♦
62mW DirectDrive Headphone Amplifier
♦
High PSRR (70dB at 1kHz)
♦
Analog Volume Control (MAX9752)
♦
Beep Input with Glitch Filter (MAX9752)
♦
2:1 Stereo Input MUX (MAX9753)
♦
±8kV ESD-Protected Headphone Outputs
♦
No Output DC-Blocking Capacitors
♦
Industry-Leading Click-and-Pop Suppression
Features
MAX9752/MAX9753/MAX9754
Ordering Information
PART
MAX9752AETI+
MAX9752BETI+
MAX9752CETI+
MAX9753ETI+
MAX9754ETI+
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
PKG
CODE
T2855-1
T2855-1
T2855-1
T2855-1
T2855-1
MAXIMUM
GAIN (dB)
13.5
19.5
10.5
13.5
13.5
Applications
Notebook PCs
Tablet PCs
Portable DVDs
Flat-Panel TVs
PC Displays
LCD Projectors
Pin Configurations appear at end of data sheet.
Note:
All devices specified for -40°C to +85°C operation.
+Denotes
lead-free package.
*EP
= Exposed paddle.
Block Diagrams
MAX9752
S
CLASS
D
AMP
MAX9753
MAX9754
S
CLASS
D
AMP
CLASS
D
AMP
VOL
HPS
BEEP
INPUT
MUX
SELECT
HPS
HPS
________________________________________________________________
Maxim Integrated Products
1
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.
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
MAX9752/MAX9753/MAX9754
ABSOLUTE MAXIMUM RATINGS
V
DD
, PV
DD
, HPV
DD
, CPV
DD
to GND ....................... -0.3V to +6V
GND to PGND or CPGND .................................... -0.3V to +0.3V
CPV
SS
or V
SS
to PGND ........................................ -6.0V to +0.3V
C1N to PGND .........................................(CPV
SS
- 0.3V) to +0.3V
C1P to PGND........................................ -0.3V to (CPV
DD
+ 0.3V)
HP_ to PGND......................... (HPV
SS
- 0.3V) to (HPV
DD
+ 0.3V)
HP_ to PGND.............................................................. -3V to +3V
Any Other Pin to PGND ............................. -0.3V to (V
DD
+ 0.3V)
Duration of OUT_ Short Circuit to PGND or PV
DD
.........Continuous
Duration of OUT_+ Short Circuit to OUT_- .................Continuous
Duration of HP_ Short Circuit to PGND ......................Continuous
Continuous Current Into/Out of PV
DD
, OUT_, PGND ...........1.7A
Continuous Current Into/Out of CPV
DD
, C1N, CPGND,
C1P, CPV
SS
, V
SS
, HPV
DD
, HP_ ......................................0.85A
Continuous Input Current (all other pins) ........................ ±20mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TQFN (derate 21.3mW/°C above +70°C) .......1702mW
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
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= +5.0V, GND = PGND = HPGND = 0V, V
SHDN
= V
DD
, CPV
SS
= V
SS
, C
BIAS
= 1µF,
C
CPVSS
= 1µF, C1 = 1µF, speaker impedance = 8Ω connected between OUT_+ and OUT_-, headphone load is terminated to GND;
MAX9752: GAIN1 = GAIN2 = 0, V
VOL
= 0V; MAX9753: GAIN = 0, V
A/B
= 0V; MAX9754: GAIN = 0; T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
GENERAL
Supply Voltage Range,
Speaker Amplifier
Supply Voltage Range,
Headphone Amplifier
Quiescent Current
Shutdown Supply Current
Gain Switching Time
Mux Switching Time
Input Resistance
Turn-On Time
V
DD
, PV
DD
Inferred from PSRR test
HPV
DD
I
DD
I
SHDN
t
SWG
t
SWM
R
IN
t
ON
MAX9752A,
MAX9752B,
MAX9753, MAX9754
MAX9752C
Power-Supply Rejection Ratio
(Note 3)
MAX9753 only
MAX9752
MAX9753/MAX9754
10
3.5
Inferred from PSRR test
Speaker mode, no load
Headphone mode, no load
V
SHDN
= 0V
4.5
3.0
14
7.2
0.2
3
3
20
6.6
25
30
10.0
5.5
5.5
18
9.5
8
V
V
mA
µA
µs
µs
kΩ
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CLASS D SPEAKER AMPLIFIERS (HPS = GND)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
50
74
70
60
dB
±7
±9.6
±38.8
±55
±40
±60
mV
Output Offset Voltage
OUT_+ to OUT_-
V
OS
PV
DD
or V
DD
= 4.5V to 5.5V, T
A
= +25°C
PSRR
f = 1kHz, V
RIPPLE
= 100mV
P-P
f = 10kHz, V
RIPPLE
= 100mV
P-P
2
_______________________________________________________________________________________
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= +5.0V, GND = PGND = HPGND = 0V, V
SHDN
= V
DD
, CPV
SS
= V
SS
, C
BIAS
= 1µF,
C
CPVSS
= 1µF, C1 = 1µF, speaker impedance = 8Ω connected between OUT_+ and OUT_-, headphone load is terminated to GND;
MAX9752: GAIN1 = GAIN2 = 0, V
VOL
= 0V; MAX9753: GAIN = 0, V
A/B
= 0V; MAX9754: GAIN = 0; T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
GAIN2 = 0, GAIN1 = 0
MAX9752A
GAIN2 = 0, GAIN1 = 1
GAIN2 = 1, GAIN1 = 0
GAIN2 = 1, GAIN1 = 1
GAIN2 = 0, GAIN1 = 0
MAX9752B
Speaker Amplifier Gain (Note 4)
A
V_SP
GAIN2 = 0, GAIN1 = 1
GAIN2 = 1, GAIN1 = 0
GAIN2 = 1, GAIN1 = 1
GAIN2 = 0, GAIN1 = 0
MAX9752C
GAIN2 = 0, GAIN1 = 1
GAIN2 = 1, GAIN1 = 0
GAIN2 = 1, GAIN1 = 1
MAX9753/MAX9754
GAIN = 1
GAIN = 0
MAX9752A,
MAX9752B, MAX9753,
MAX9754
MAX9752C
f = 1kHz, THD+N
= 1%, T
A
= +25°C,
R
L
= 4Ω
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Click-and-Pop Level (Note 5)
Capacitive-Load Drive
Switching Frequency
Crosstalk
Off-Isolation
Efficiency
η
THD+N
SNR
K
CP
C
L_MAX
f
SW
Channel to channel, f = 10kHz, P
OUT
= 1W
MAX9753, unselected input to any active
input, f = 10kHz
R
L
= 8Ω, P
OUT
= 1W, f = 1kHz
f = 1kHz, P
OUT
= 1W
P
OUT
= 1W, f = 1kHz,
BW = 22Hz to 22kHz
Into shutdown
Out of shutdown
Differential
1000
MAX9752A,
MAX9752B, MAX9753,
MAX9754
MAX9752C
R
L
= 8Ω
R
L
= 4Ω
Unweighted
A-weighted
MIN
TYP
9.0
10.5
12.0
13.5
15.0
16.5
18.0
19.5
6.0
7.5
9.0
10.5
9.0
10.5
1.3
0.8
2.2
1.7
0.023
0.03
90
91
-47
-34
200
1200
70
70
85
1400
%
dB
dBV
pF
kHz
dB
dB
%
dB
MAX
UNITS
MAX9752/MAX9753/MAX9754
f = 1kHz, THD+N
= 1%, T
A
= +25°C,
R
L
= 8Ω
Output Power
P
OUT_SP
W
_______________________________________________________________________________________
3
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
MAX9752/MAX9753/MAX9754
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= +5.0V, GND = PGND = HPGND = 0V, V
SHDN
= V
DD
, CPV
SS
= V
SS
, C
BIAS
= 1µF,
C
CPVSS
= 1µF, C1 = 1µF, speaker impedance = 8Ω connected between OUT_+ and OUT_-, headphone load is terminated to GND;
MAX9752: GAIN1 = GAIN2 = 0, V
VOL
= 0V; MAX9753: GAIN = 0, V
A/B
= 0V; MAX9754: GAIN = 0; T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MAX9752,
GAIN1 = don’t care
A
V_HP
MAX9753/MAX9754
Power-Supply Rejection Ratio
(Note 3)
Output Power
GAIN2 = 0
GAIN2 = 1
GAIN = 1
GAIN = 0
66
0
3
0
3
73
80
60
31
62
0.005
%
0.005
95
dB
A-weighted
101
-33
-37
300
60
60
0.8
HPS = GND (disabled)
f
CP
R
VOL
HYST
VOL
V
VOL_MUTE
A
V_MUTE
f
IN
= 1kHz
V
VOL
falling
540
1
600
100
50
0.858 x
V
DD
-85
660
dBV
pF
dB
dB
V/µs
kΩ
kHz
MΩ
mV
V
dB
mW
dB
dB
CONDITIONS
MIN
TYP
±0.5
MAX
±3.5
±8
UNITS
HEADPHONE AMPLIFIER (HPS = V
DD
)
Output Offset Voltage
V
OS
mV
Maximum Headphone Amplifier
Gain (Note 6)
HPV
DD
or V
DD
= 3V to 5.5V, T
A
= +25°C
PSRR
f = 1kHz, V
RIPPLE
= 100mV
P-P
f = 10kHz, V
RIPPLE
= 100mV
P-P
P
OUT_HP
THD+N = 1%, f
IN
=
1kHz, T
A
= +25°C
R
L
= 32Ω
R
L
= 16Ω
R
L
= 32Ω,
P
OUT
= 31mW
R
L
= 16Ω,
P
OUT
= 62mW
Unweighted
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz
Signal-to-Noise Ratio
SNR
R
L
= 32Ω,
P
OUT
= 31mW,
f
IN
= 1kHz,
BW = 22Hz to 22kHz
Into shutdown
Out of shutdown
No sustained oscillations
Click-and-Pop Level (Note 7)
Capacitive-Load Drive
Crosstalk
Off-Isolation
Slew Rate
Output Impedance
CHARGE PUMP
Charge-Pump Frequency
VOLUME CONTROL (MAX9752 Only)
VOL Input Impedance
VOL Input Hysteresis
Full Mute Input Voltage
Full Mute Attenuation
K
CP
C
L_MAX
f = 10kHz, P
OUT
= 62mW, R
L
= 16Ω
MAX9753, unselected input to any active
input, f = 10kHz
SR
4
_______________________________________________________________________________________
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= +5.0V, GND = PGND = HPGND = 0V, V
SHDN
= V
DD
, CPV
SS
= V
SS
, C
BIAS
= 1µF,
C
CPVSS
= 1µF, C1 = 1µF, speaker impedance = 8Ω connected between OUT_+ and OUT_-, headphone load is terminated to GND;
MAX9752: GAIN1 = GAIN2 = 0, V
VOL
= 0V; MAX9753: GAIN = 0, V
A/B
= 0V; MAX9754: GAIN = 0; T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
Gain 10.5dB to 13.5dB
Channel Matching
Gain 6.0dB to 10.0dB
Gain -26dB to +4.0dB
Gain -62dB to +30dB
BEEP INPUT (MAX9752 Only)
Beep Signal Minimum Amplitude
(Note 8)
Beep Signal Minimum Frequency
Input High Voltage
Input Low Voltage
V
BEEP
f
BEEP
V
IH
V
IL
GAIN_,
SHDN
Input Leakage Current
I
LEAK
IN1/2
HPS
-1
-2
-20
R
BEEP
= 47kΩ
400
300
2.0
0.8
+1
+2
+1
µA
mV
Hz
V
V
MIN
TYP
±0.2
±0.2
±0.3
±1.0
dB
MAX
UNITS
MAX9752/MAX9753/MAX9754
/
LOGIC INPUTS (GAIN_, IN1/
2
,
SHDN,
HPS)
Note 1:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2:
Speaker amplifier testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For
R
L
= 4Ω, L = 33µH. For R
L
= 8Ω, L = 68µH.
Note 3:
Measured with the amplifier input connected to GND through C
IN
.
Note 4:
Speaker amplifier gain is defined as A = (V
OUT_+
- V
OUT_-
) / V
IN_
.
Note 5:
Testing performed with 8Ω resistive load in series with 68µH inductive load connected across the BTL output. Mode transitions
are controlled by
SHDN.
Peak reading, THD+N = 1%, A-weighted, 32 samples per second. K
CP
level is calculated as:
20 x log[(peak voltage under normal operation at rated power level) / (peak voltage during mode transition, no input signal)].
Note 6:
Headphone amplifier gain is defined as A = V
HP_
/ V
IN_
.
Note 7:
Testing performed with 32Ω resistive load connected from HP_ output to GND. Mode transitions are controlled by
SHDN.
Peak reading, THD+N = 1%, A-weighted, 32 samples per second. K
CP
level is calculated as:
20 x log[(peak voltage under normal operation at rated power level) / (peak voltage during mode transition, no input signal)].
Note 8:
The value of R
BEEP
dictates the minimum beep signal amplitude that is detected (see the
Beep Input (MAX9752)
section).
_______________________________________________________________________________________
5
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