19-5810; Rev 3; 11/11
TION KIT
EVALUA BLE
AVAILA
Audio Amplifier with Jack Detection
General Description
The MAX97236 is an audio amplifier with volume con-
trol and microphone preamplifier intended for use in
portable audio systems employing a headphone jack.
The audio circuit is powered from a single, dual-mode
charge pump, allowing the output signals to be ground
referenced, and eliminating the need for large and
expensive DC-blocking capacitors. The configuration of
a 3.5mm jack is determined by autoconfigure circuitry.
The IC’s functional blocks are auto-enabled after the
configuration of the jack is determined.
The audio amplifier is powered from a single 1.8V power
supply that reduces overall power consumption. The
microphone preamplifier and bias are powered from a
separate power-supply input accommodating bias volt-
ages that are greater than 2.4V.
The automatic jack detection determines when a 3.5mm
plug is inserted into the system jack and determines the
configuration of the installed load. The configuration of
the load is then reported to the system through the I
2
C
interface. Multiple popular jack and load configurations
are detectable with this scheme. The IC detects head-
sets, headphones, and A/V cables.
The headphone amplifier is capable of over 35mW into
16I. The device is available in a small, 25-bump WLP
package with a 0.4mm pitch and is specified over the
extended -40NC to +85NC temperature range.
HPL
Features
S
30mW Headphone Amplifier Employs Second-
Generation DirectDrive
®
with Dual-Mode Charge-
Pump Architecture
S
Automatic Jack Detection Circuitry
S
Microphone Amplifier and Bias
S
1.8V Power Supply
S
2.4V to 3.6V Microphone Power Supply
S
Headphone Amplifier Volume Control
S
Decodes Data from a Passive Multibutton Headset
Remote Control
S
25-Bump, 2.4mm x 2.3mm, 0.4mm Pitch WLP
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
MAX97236
Simplified Block Diagram
1.8V
V
DD
2.4V TO 3.0V
MICVDD
TIP
Applications
Smartphones
Mobile Handsets
Notebooks
Portable Gaming Devices
Tablets
HPR
RING1
CHARGE
PUMP
JACK
DETECTION
AND
CONFIGURATION
RING2
Ordering Information
PART
MAX97236EWA+
TEMP
RANGE
-40NC to +85NC
PIN-
PACKAGE
25 WLP
I
2
C
ADDRESS
0x80
SDA
SCL
IRQ
MOUTP
MOUTN
MAX97236
I
2
C
INTERFACE
AND
CONTROL
SLEEVE
SERIAL
INTERFACE
+Denotes
a lead(Pb)-free/RoHS-compliant package.
MIC
JACKSW
Functional Diagram/Typical Application Circuit appears at end of
data sheet.
_______________________________________________________________
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.
Audio Amplifier with Jack Detection
MAX97236
ABSOLUTE MAXIMUM RATINGS
V
DD
to PGND ..........................................................-0.3V to +2V
MICVDD to PGND ................................................-0.3V to +5.5V
PVDD to PGND......................................... -0.3V to (V
DD
+ 0.3V)
PVSS to PGND ........................................................-2V to +0.3V
GND to PGND ......................................................-0.1V to +0.1V
TIP, RING1, IN_ to PGND..................................... (V
PVSS
- 0.3V)
to (V
PVDD
+ 0.3V)
RING2, SLEEVE to PGND ...................................... (GND - 0.3V)
to (V
MICVDD
+ 0.3V)
JACKSW to PGND.............. (V
PVSS
- 0.3V) to (V
MICVDD
+ 0.3V)
MBIAS to PGND ....................................... -0.3V to (V
DD
+ 0.3V)
MOUT+ and MOUT- to PGND ..........-0.3V to (V
MICVDD
+ 0.3V)
C1P to PGND ........................................-0.3V to (V
PVDD
+ 0.3V)
C1N to PGND ........................................ (V
PVSS
- 0.3V) to +0.3V
SDA, SCL, EXTCLK, and IRQ to PGND ..................-0.3V to +6V
Output Short-Circuit Duration ....................................Continuous
Continuous Power Dissipation (Mulitlayer Board, T
A
= +70NC)
25-Bump WLP (derate 19.2mW/NC above +70NC)....1536mW
Junction Temperature .....................................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Storage Temperature Range............................ -65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
Junction-to-Ambient Thermal Resistance (q
JA
)...............52°C/W
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= 1.8V, V
MICVDD
= 3.0V, V
GND
= V
PGND
= 0V, C
FLY
= C
PVDD
= C
PVSS
= 1FF. Typical values tested at T
A
= +25NC, unless
otherwise noted. See the
Functional Diagram/Typical Application Circuit.)
(Note 2)
PARAMETER
GENERAL
Supply Voltage Range
Undervoltage Lockout
V
DD
UVLO
I
VDD_SDF
Shutdown Supply Current
I
VDD_SDS
Sleep Supply Current
Quiescent Supply Current
SDA, SCL Input Logic-High
SDA, SCL Input Logic-Low
SDA, SCL, EXTCLK Input
Leakage Current High
SDA, SCL, EXTCLK Input
Leakage Current Low
SDA, SCL Output Logic-Low
IRQ Output High Current
IRQ Output Logic-Low
I
VDD_SL
I
VDD
V
IH
V
IL
I
IH
I
IL
V
OLI2C
I
OH
V
OL
Guaranteed by PSRR test
Rising V
DD
, T
A
= +25NC
In jack detect mode, T
A
= +25NC, fast
detect mode, external clock disabled
In jack detect mode, T
A
= +25NC, slow
detect mode, external clock disabled
T
A
= +25NC, external clock disabled
T
A
= +25NC, state = LRGM
1.8V logic compliant
1.8V logic compliant
T
A
= +25NC
T
A
= +25NC
I
OLI2C
= 2.3mA
V
IRQ_OUT
= 3.3V, T
A
= +25NC
I
OL
= 3mA
-1
-1
0.2 x
V
DD
1
0.25 x
V
DD
1.4
0.4
+1
+1
2.3
14
14
1.62
1.8
1.98
1.6
25
FA
25
25
3.9
FA
mA
V
V
FA
FA
V
FA
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
Audio Amplifier with Jack Detection
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 1.8V, V
MICVDD
= 3.0V, V
GND
= V
PGND
= 0V, C
FLY
= C
PVDD
= C
PVSS
= 1FF. Typical values tested at T
A
= +25NC, unless
otherwise noted. See the
Functional Diagram/Typical Application Circuit.)
(Note 2)
PARAMETER
EXTCLK Input High Voltage
EXTCLK Input Low Voltage
EXTCLK Frequency Range
EXTCLK Duty Cycle
Maximum EXTCLK Slew Rate
Turn-On Time
JACK DETECTION
Turn-On Time
t
ONTIME
V
OS
P
OUT
V
O_LINE
THD+N
Jack detect time from insertion to
interrupt (Note 4)
T
A
= +25NC, state = LRGM
R
L
= 32I, THD+N = 1%, f
IN
= 1kHz
R
L
= 16I, THD+N = 1%, f
IN
= 1kHz
R
L
= 10kI
R
L
= 16I, P
OUT
= 10mW, f
IN
= 1kHz
R
L
= 16I, P
OUT
= 0.1mW, f
IN
= 1kHz
R
L
= 10kI, V
OUT
= 1V
RMS
, f
IN
= 1kHz
Referenced to 32I load, 1V
RMS
input
signal, A-weighted
Referenced to 32I load, 1V
RMS
input
signal, A-weighted (gain = -30dB)
DC 1.62V to 1.98V, gain = 0dB,
T
A
= +25NC
Power-Supply Rejection Ratio
PSRR
f
IN
= 217Hz, 100mV
P-P
ripple,
gain = 0dB
f
IN
= 10kHz, 100mV
P-P
ripple,
gain = 0dB
A-weighted
Output Noise
V
N
I
OUT
Z
OUT
R
L
= 16I, f
IN
= 1kHz, P
OUT
= 5mW,
crosstalk between audio channels,
gain = 0dB, with ground sense
R
L
= 32I, f
IN
= 1kHz, P
OUT
= 25mW,
crosstalk between audio channels,
gain = 0dB, with ground sense
A-weighted, gain = -30dB
A-weighted, gain = -60dB
Peak Output Current
Minimum Headphone Impedance
Peak current needed to output the rated
typical power
-500
30
35
1
0.05
0.04
0.03
103
dB
85
87
78
74
6
1.7
1.4
40
12
-51
dB
-56
mA
I
FV
RMS
dB
%
500
ms
t
ON
f
EXTCLK
D_EXTCLK
T
A
= +25NC
T
A
= +25NC
f
EXTCLK
= 1MHz, 0.4V to 1.4V
f
EXTCLK
= 10MHz, 0.4V to 1.4V
(Note 3)
1
45
50
5
1
10
19.2
SYMBOL
CONDITIONS
MIN
1.4
0.4
26
55
TYP
MAX
UNITS
V
V
MHz
%
ns
ms
MAX97236
AUDIO AMPLIFIER (Gain = 0dB, Unless Otherwise Noted)
Output Offset Voltage
Output Power
Line Output Voltage
Total Harmonic Distortion
Plus Noise
+500
FV
mW
V
RMS
Signal-to-Noise Ratio
SNR
Crosstalk
XTALK
3
Audio Amplifier with Jack Detection
MAX97236
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 1.8V, V
MICVDD
= 3.0V, V
GND
= V
PGND
= 0V, C
FLY
= C
PVDD
= C
PVSS
= 1FF. Typical values tested at T
A
= +25NC, unless
otherwise noted. See the
Functional Diagram/Typical Application Circuit.)
(Note 2)
PARAMETER
Maximum Capacitive Load Drive
SYMBOL
C
L
CONDITIONS
R
L
= 10kI, gain
R
0dB
R
L
= 10kI, gain < 0dB
R
L
= 32I
P
OUT
= 0.5mW, R
L
= 32I
P
OUT
= 4.5mW, R
L
= 32I,
Per channel (Note 5)
P
OUT
= 20mW, R
L
= 32I,
(Note 6)
Charge-Pump Switch Threshold
Output voltage needed THSH = 0
to toggle the charge-
THSH = 1
pump outputs
KCP
C
IN
Z
IN
From min to max volume setting
R
L
= 32I, peak
voltage, A-weighted,
32 samples/second
Gain = 6dB
16
-60
5.5
-60.5
6
-60
80
-0.5
Volume setting -54dB
P
_VOL
P
6dB
Volume setting -60dB
P
_VOL
P
-54dB
V
MICVDD
V
BIAS
I
BIAS_OUT
I
MBIAS
MICR = 0b00, V
MBIAS
= 2.6V,
T
A
= +25NC
MICR = 0b01, V
MBIAS
= 2.6V,
T
A
= +25NC
MICR = 0b10, V
MBIAS
= 2.6V,
T
A
= +25NC
MICR = 0b11, V
MBIAS
= 2.6V,
T
A
= +25NC
Bias Output Noise
V
N_BIAS
With external capacitor, V
MBIAS
= 2.6V
2.02
2.39
2.76
Guaranteed by MIC bias PSRR test
High output voltage
Low output voltage
R
MICBIAS
= 2.2kI, high (2.6V) output
voltage, T
A
= +25NC
2.4
2.4
1.84
1.2
150
2.2
2.6
3
0.07
2.8
FV
RMS
400
2.38
2.81
kI
3.24
2.6
2
1
2
3.6
2.8
2.16
+0.5
Into shutdown
Out of shutdown
MIN
TYP
470
200
200
4.5
6.8
23
0.4
0.55
-74
-74
150
75
+6
6.5
-59.5
V
mW
pF
MAX
UNITS
Power Consumption
Click-and-Pop Level
Input Capacitance
Input Impedance
Gain Range
Maximum Volume Setting
Minimum Volume Setting
Mute Attenuation
Channel-to-Channel Gain
Matching
Gain Change per Step
MICROPHONE BIAS
MIC Bias Supply Voltage
Bias Output Voltage
Bias Output Current
MIC Supply Current Consumption
dBV
pF
kI
dB
dB
dB
dB
dB
dB
AUDIO AMPLIFIER VOLUME CONTROL
V
V
mA
FA
Bias Output Resistance
R
MBIAS
4
Audio Amplifier with Jack Detection
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 1.8V, V
MICVDD
= 3.0V, V
GND
= V
PGND
= 0V, C
FLY
= C
PVDD
= C
PVSS
= 1FF. Typical values tested at T
A
= +25NC, unless
otherwise noted. See the
Functional Diagram/Typical Application Circuit.)
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
V
MICVDD
= 2.4V to
3.6V, T
A
= +25NC
f
IN
= 2kHz, 100mV
P-P
ripple
23
11
MIN
74
TYP
90
dB
75
MAX
UNITS
MAX97236
Bias Power-Supply Rejection
PSRR
MBIAS
R
MBIAS
= 2.2kI
MICROPHONE PREAMPLIFIER
MIC Preamp Gain
Supply Current Consumption
MIC Preamp Noise
Total Harmonic Distortion
Plus Noise
Low Corner Frequency Response
High Corner Frequency Response
MIC Preamplifier Power-Supply
Rejection
Output Common-Mode Voltage
Input Capacitance
Input Resistance
Output Impedance
6-BIT KEY ENCODER ADC
ADC Trip Level
Minimum ADC Course Range
Maximum ADC Course Range
Minimum ADC Fine Range
Maximum ADC Fine Range
CHARGE PUMP
Oscillator Frequency
f
OSC1
f
OSC2
V
OUT
= 0V, R
L
= open, T
A
= +25NC
V
OUT
= 0.2V, R
L
= open
78
83
665
88
kHz
Level at which the mic bias must drop to
trigger a conversion
LSB 10mV
LSB 10mV
LSB 2mV
LSB 2mV
0.64
0.128
0.64
0
0.128
V
V
V
V
V
A
MIC
I
DD_MAMP
V
N_MAMP
Input referred (Note 7), gain = 24dB,
A-weighted 0.1kHz to 7kHz
Gain = high, f
IN
= 997Hz
Gain = low, f
IN
= 997Hz
24
12
200
3
3
15
> 300
74
90
58
0.8
85
100
10
V
pF
MI
I
25
13
300
dB
FA
FV
%
Hz
kHz
dB
THD+N
MICPRE
f
IN
= 1kHz, V
IN
= 1V
RMS
f
-3dB
f-
3dB
PSR
MAMP
V
CM_MIC
C
MAMP
R
MAMP
Z
OUT
Relative to 997Hz
Relative to 997Hz
V
MICVDD
= 2.4V to 3.6V, T
A
= +25NC,
gain = +24dB, R
MIC
= 500I
f
IN
= 2kHz, 100mV
P-P
ripple (Note 7)
Voltage measured from MOUTP or
MOUTN to GND
AC-coupling capacitance
Input resistance
5
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