19-4981; Rev 1; 3/10
TION KIT
EVALUA BLE
AVAILA
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
General Description
The MAX97200 is a 45mW Class H headphone amplifier
that runs from a single low 1.8V supply voltage and employs
Maxim’s second-generation DirectDrive
technology.
The MAX97200 features a Dual ModeK internal charge
pump to generate the power rails for the amplifier. The
charge-pump output can be
QPVIN/2
or
QPVIN
depend-
ing on the amplitude of the output signal. When the out-
put voltage is low, the power-supply voltage is
QPVIN/2.
When the output signal demands larger output voltage,
the charge pump switches modes so that a greater
power-supply voltage is realized and more output power
can be delivered to the load.
Second-generation DirectDrive technology improves
power consumption when compared to first-generation
DirectDrive amplifiers. The MAX97200 can be powered
from a regulated 1.8V and have similar power consump-
tion to a traditional DirectDrive amplifier that is powered
from 0.9V.
Maxim’s patented DirectDrive architecture uses an
inverting charge pump to derive a negative voltage
supply. The headphone amplifier is powered between
the positive supply and the generated negative rail.
This scheme allows the audio output signal to be
biased about ground, eliminating the need for large
DC-blocking capacitors between the amplifier output
and the headphone load.
Low-output offset voltage provides very good click-and-
pop performance both into and out of shutdown. High
signal-to-noise ratio maintains system fidelity.
The MAX97200 is available in a tiny, 12-bump wafer
level packaging (WLP 1.27mm x 1.65mm) with a small,
0.4mm lead pitch and specified over the -40NC to +85NC
extended temperature range.
Features
S
Second-Generation DirectDrive Technology
S
Dynamic, Class H, Dual Mode Charge Pump
S
Low Voltage Operation, V
PVIN
= 1.8V
S
Low Quiescent Current, 1.15mA (typ) at V
PVIN
=
1.8V
S
Eliminates Large Output DC-Blocking Capacitors
S
Industry-Leading Click-and-Pop Performance
S
High-Fidelity, SNR 105dB (5.6µV Output Noise)
S
Output Power 34mW into 32I (THD+N 1%)
S
Output Power 45mW into 16I (THD+N 10%)
S
Tiny, 12-Bump, 1.27mm x 1.65mm (0.4mm Lead
Pitch) WLP Package
MAX97200
Ordering Information/
Selector Guide
PART
MAX97200AEWC+
MAX97200BEWC+
GAIN
(dB)
3
0
PIN-
PACKAGE
12 WLP
12 WLP
TOP
MARK
ABF
ABG
Note:
All devices operate over the -40°C to +85°C tempera-
ture range.
+Denotes
a lead(Pb)-free and RoHS-compliant package.
Typical Operating Circuit
MAX97200
LEFT AUDIO
INPUT
Applications
Cellular Phones
Smartphones
MP3 Players
VoIP Phones
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
APPLICATIONS
PROCESSOR
LEFT AUDIO OUTPUT
SHDN
RIGHT AUDIO
INPUT
RIGHT AUDIO
OUTPUT
CHARGE
PUMP
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
MAX97200
ABSOLUTE MAXIMUM RATINGS
PVIN or PVDD to PGND .......................................-0.3V to +2.2V
GND to PGND ......................................................-0.3V to +0.3V
PVSS to PGND .....................................................-2.2V to +0.3V
OUT_ and IN_ to GND ............. (PVSS - 0.2V) to (PVDD + 0.2V)
C1P, C1N ...................................................Cap connection only
SHDN
to GND .........................................................-0.3V to +4V
Output Short-Circuit Current .....................................Continuous
Thermal Limits (Note 1)
Multiple Layer PCB
Continuous Power Dissipation (T
A
= +70NC)
12-Bump WLP (derate 13.7mW/NC above +70NC)....1095mW
12-Bump WLP
B
JA
.......................................................73NC/W
12-Bump WLP
B
CA
......................................................30NC/W
Junction Temperature .....................................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Storage Temperature Range............................ -65NC to +150NC
Bump Temperature (soldering) Reflow ...........................+230NC
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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
PVIN
= 1.8V, V
PGND
= V
GND
= 0V, V
SHDN
= 1.8V, C1 = C2 = C3 = 1FF, C4 = 10FF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
POWER SUPPLY
Supply Voltage Range
UVLO Rising
UVLO Falling
Quiescent Supply Current
Shutdown Current
Turn-On Time
CHARGE PUMP
Oscillator Frequency
Oscillator Frequency
Oscillator Frequency
f
OSC1
f
OSC2
f
OSC3
V
OUT
= 0V, T
A
= +25NC
V
OUT
= 0.2V, R
L
=
J,
f
IN
= 1kHz
V
OUT
= 0.5V, R
L
=
J,
f
IN
= 1kHz
V
OUT
= 0.2V, R
L
=
J
V
OUT
= 0.5V, R
L
=
J
Negative Output Voltage
V
PVSS
V
OUT
= 0.2V, R
L
=
J
V
OUT
= 0.5V, R
L
=
J
R
L
=
J,
output voltage at which the
charge pump switches modes, V
OUT
rising, transition from 1/8 to normal
frequency
R
L
=
J,
output voltage at which the
charge pump switches modes, V
OUT
rising, transition from high-efficiency
mode to high-power mode
78
83
665
500
PVIN/2
PVIN
-PVIN/2
-PVIN
QPVIN
x
0.08
QPVIN
x
0.24
V
88
kHz
kHz
kHz
I
DD
I
SHDN
t
ON
Inputs grounded, T
A
= +25NC, no load
16I load, inputs grounded, T
A
= +25NC
V
SHDN
= 0V, T
A
= +25NC
1.36
PVIN
Guaranteed by PSRR
1.62
1.80
1.48
1.46
1.15
1.16
0.2
.6
1
1.7
1.98
1.58
V
V
V
mA
FA
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Positive Output Voltage
V
PVDD
V
Output Voltage Threshold
V
TH1
V
Output Voltage Threshold
V
TH2
V
2
______________________________________________________________________________________
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
PVIN
= 1.8V, V
PGND
= V
GND
= 0V, V
SHDN
= 1.8V, C1 = C2 = C3 = 1FF, C4 = 10FF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25NC) (Note 2)
PARAMETER
SYMBOL
t
HOLD
Charge-Pump Mode Transition
Timeouts (Figure 2)
t
RISE
AMPLIFIER
Voltage Gain
Maximum Output Voltage
Channel-to-Channel Gain
Matching
Total Output Offset Voltage
Input Resistance
V
OS
R
IN
T
A
= +25NC
MAX97200A
MAX97200B
V
PVDD
= 1.62V to 1.98V, T
A
= +25NC
Power-Supply Rejection Ratio
PSRR
f
IN
= 217Hz
100mV
P-P
ripple
f
IN
= 1kHz
f
IN
= 20kHz
R
L
= 10kI
Output Power
Line Output Voltage
Total Harmonic Distortion Plus
Noise
Output Noise
Signal-to-Noise Ratio
P
OUT
V
LINE
THD+N
V
N
SNR
THD+N = 1%
R
L
= 10kI
R
L
= 16I, P
OUT
= 0.1mW, f
IN
= 1kHz (Note 3)
R
L
= 16I, P
OUT
= 10mW, f
IN
= 1kHz (Note 4)
R
L
= 10kI, V
OUT
= 1V, f
IN
= 1kHz (Note 4)
Inputs grounded, A-weighted, MAX97200B
A-weighted, MAX97200B
R
L
= 32I, peak
voltage, A-weighted,
32 samples/second,
MAX97200B
Into shutdown
Out of shutdown
R
L
= 32I
R
L
= 16I
6
7.2
62
A
V
MAX97200A
MAX97200B
R
L
= 10kI, THD+N = 1%
R
L
= 10kI, THD+N = 10%
2.75
-0.17
2.92
0
1.295
1.44
Q0.1
Q0.1
10
12
83
96
94
61
0.16
34
45
1
0.02
0.003
0.008
5.6
105
80
dBV
68
69
200
dB
pF
FV
dB
%
V
RMS
mW
dB
Q0.3
14
16.8
3.09
+0.17
dB
V
PK
dB
mV
kI
CONDITIONS
Time it takes for the charge pump to
transition from high-power mode to
high-efficiency mode; R
L
=
J
Time it takes for the charge pump to
transition from high-efficiency mode to high-
power mode (90% of its value); R
L
=
J
MIN
TYP
32
MAX
UNITS
ms
MAX97200
20
Fs
Click-and-Pop Level
V
CP
Crosstalk
Maximum Capacitive Load
X
TALK
R
L
= 16I, 1kHz, P
OUT
= 5mW
_______________________________________________________________________________________
3
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
MAX97200
ELECTRICAL CHARACTERISTICS (continued)
(V
PVIN
= 1.8V, V
PGND
= V
GND
= 0V, V
SHDN
= 1.8V, C1 = C2 = C3 = 1FF, C4 = 10FF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25NC) (Note 2)
PARAMETER
DIGITAL INPUT (SHDN)
Input High Voltage
Input Low Voltage
Input Leakage Current
V
IH
V
IL
I
IH
I
IL
V
SHDN
= 4V, T
A
= +25NC
V
SHDN
= 1.8V, T
A
= +25NC
V
SHDN
= 0V, T
A
= +25NC
-1
-1
-1
1.4
0.4
+1
+1
+1
FA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 2:
All specifications are 100% tested at T
A
= +25NC. Temperature limits are guaranteed by design.
Note 3:
V
PVDD
= 0.9V, V
PVSS
= -0.9V.
Note 4:
V
PVDD
= 1.8V, V
PVSS
= -1.8V.
Typical Operating Characteristics
(V
PVIN
= 1.8V, V
PGND
= V
GND
= 0V, V
SHDN
= 1.8V, C1 = C2 = C3 = 1FF, C4 = 10FF, both channels driven in phase, T
A
= +25NC,
unless otherwise noted.)
THD+N vs. OUTPUT POWER
MAX97200 toc01
THD+N vs. OUTPUT POWER
MAX97200 toc02
THD+N vs. OUTPUT VOLTAGE
R
L
= 10kI
MAX97200 toc03
100
10
THD+N (%)
1
0.1
R
L
= 16I
100
10
THD+N (%)
1
0.1
0.01
R
L
= 32I
100
10
THD+N (%)
1
0.1
f
IN
= 100Hz
0.01
0.001
0
10
20
30
40
f
IN
= 1kHz
f
IN
= 6kHz
50
60
70
80
P
OUT
(mW)
f
IN
= 100Hz
f
IN
= 1kHz
f
IN
= 1kHz
0.01
f
IN
= 6kHz
0.001
f
IN
= 100Hz
0.001
0
10
20
30
P
OUT
(mW)
40
50
60
f
IN
= 6kHz
0
0.5
1.0
1.5
2.0
2.5
V
OUT
(V
RMS
)
THD+N vs. FREQUENCY
MAX97200 toc04
THD+N vs. FREQUENCY
MAX97200 toc05
THD+N vs. FREQUENCY
R
L
= 10kI
MAX97200 toc06
10
R
L
= 16I
10
R
L
= 32I
10
1
THD+N (%)
1
THD+N (%)
1
THD+N (%)
0.1
P
OUT
= 20mW
P
OUT
= 25mW
0.1
P
OUT
= 20mW
0.01
P
OUT
= 2mW
0.01
0.1
P
OUT
= 25mW
0.1
V
OUT
= 0.868V
RMS
0.01
V
OUT
= 0.316V
RMS
0.01
0.1
1
FREQUENCY (kHz)
10
100
V
OUT
= 1.12V
RMS
0.01
P
OUT
= 2mW
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.001
1
FREQUENCY (kHz)
10
100
4
______________________________________________________________________________________
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(V
PVIN
= 1.8V, V
PGND
= V
GND
= 0V, V
SHDN
= 1.8V, C1 = C2 = C3 = 1FF, C4 = 10FF, both channels driven in phase, T
A
= +25NC,
unless otherwise noted.)
OUTPUT POWER
vs. LOAD RESISTANCE
MAX97200 toc07
MAX97200
OUTPUT POWER vs. LOAD RESISTANCE
AND CHARGE-PUMP CAPACITOR
MAX97200 toc08
POWER CONSUMPTION
vs. OUTPUT POWER
140
POWER CONSUMPTON (mW)
120
100
80
60
40
20
0
MAX97200 toc09
80
70
OUTPUT POWER (mW)
60
50
40
30
20
10
0
1
10
100
1000
80
70
OUTPUT POWER (mW)
60
50
40
30
20
10
160
10% THD + N
C
1
= C
2
= C
3
= 1µF
C
1
= C
2
= C
3
= .47µF
C
1
= C
2
= C
3
= 2.2µF
1% THD + N
10,000
0
10
100
1000
10,000
LOAD RESISTANCE (I)
1
10
OUTPUT POWER (mW)
100
LOAD RESISTANCE (I)
POWER DISSIPATION
vs. OUTPUT POWER
MAX97200 toc10
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX97200 toc11
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.18
0.16
SUPPLY CURRENT (µA)
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
RL =
J
MAX97200 toc12
100
90
POWER DISSIPATION (mW)
80
70
60
50
40
30
20
10
0
1
10
OUTPUT POWER (mW)
R
L
= 32I
R
L
= 16I
1.20
1.15
SUPPLY CURRENT (mA)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
RL =
J
0.20
100
1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00
SUPPLY VOLTAGE (V)
1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX97200 toc13
CROSSTALK vs. FREQUENCY
MAX97200 toc14
IN-BAND OUTPUT SPECTRUM
f = 1kHz
-20
OUTPUT MAGNITUDE (dBV)
-40
-60
-80
-100
-120
-140
MAX97200 toc15
0
-20
-40
PSRR (dB)
-60
-80
-100
-120
V
RIPPLE
= 200mV
P-P
0
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
-80
OUTPUT POWER = 22mW
R
L
= 16I
0
0.01
0.1
1
FREQUENCY (kHz)
10
100
-90
0.01
0.1
1
FREQUENCY (kHz)
10
100
-160
0.01
0.1
1
FREQUENCY (Hz)
10
100
_______________________________________________________________________________________
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