General Description
The MAX9705 3rd-generation, ultra-low EMI, mono, Class
D audio power amplifier provides Class AB performance
with Class D efficiency. The MAX9705 delivers 2.3W into
a 4Ω load and offers efficiencies above 85%. Active
emissions limiting (AEL) circuitry greatly reduces EMI by
actively controlling the output FET gate transitions under
all possible transient output-voltage conditions. AEL prevents high-frequency emissions resulting from conventional Class D free-wheeling behavior in the presence of
an inductive load. Zero dead time (ZDT) technology
maintains state-of-the-art efficiency and THD+N performance by allowing the output FETs to switch simultaneously without cross-conduction. A patented spreadspectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These
design concepts reduce an application’s component
count and extend battery life.
The MAX9705 offers two modulation schemes: a fixedfrequency (FFM) mode and a spread-spectrum (SSM)
mode that further reduces EMI-radiated emissions due to
the modulation frequency. The MAX9705 oscillator can
be synchronized to an external clock through the SYNC
input, allowing the switching frequency to be externally
defined. The SYNC input also allows multiple MAX9705s
to be cascaded and frequency locked, minimizing interference due to clock intermodulation. The device utilizes
a fully differential architecture, a full-bridged output, and
comprehensive click-and-pop suppression. The gain of
the MAX9705 is set internally (MAX9705A: 6dB,
MAX9705B: 12dB, MAX9705C: 15.6dB, MAX9705D:
20dB), further reducing external component count.
The MAX9705 is available in 10-pin TDFN (3mm x 3mm x
0.8mm), 10-pin µMAX®, and 12-bump UCSP™ (1.5mm x
2mm x 0.6mm) packages. The MAX9705 is specified over
the extended -40°C to +85°C temperature range.
Applications
Features
♦ Filterless Amplifier Passes FCC-Radiated
Emissions Standards with 24in of Cable
♦ Unique Spread-Spectrum Mode and Active
Emissions Limiting (AEL) Achieves Better than
20dB Margin Under FCC Limits
♦ Zero Dead Time (ZDT) H-Bridge Maintains State-
of-the-Art Efficiency and THD+N
♦ Simple Master-Slave Setup for Stereo Operation
♦ Up to 90% Efficiency
♦ 2.3W into 4Ω (1% THD+N)
♦ Low 0.02% THD+N (P
OUT
= 1W, VDD= 5.0V)
♦ High PSRR (75dB at 217Hz)
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (5.4mA)
♦ Low-Power Shutdown Mode (0.3µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving
Packages
10-Pin TDFN (3mm x 3mm x 0.8mm)
10-Pin µMAX
12-Bump UCSP (1.5mm x 2mm x 0.6mm)
♦ Pin-for-Pin Compatible with the MAX9700 and
MAX9712
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3405; Rev 0; 7/05
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.
EVALUATION KIT
AVAILABLE
Cellular Phones
PDAs
MP3 Players
Portable Audio
PART
TEMP RANGE
PIN-
TOP
MARK
MAX9705AETB+T
ACY
MAX9705AEUB+
10 µMAX —
MAX9705AEBC+T
ACH
MAX9705BETB+T
ACX
MAX9705BEUB+
10 µMAX —
MAX9705BEBC+T
ACG
Ordering Information continued at end of data sheet.
µMAX is a registered trademark and UCSP is a trademark of
Maxim Integrated Products, Inc.
+Denotes lead-free package.
Selector Guide appears at end of data sheet.
30.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
FCC EMI LIMIT
MAXIM'S NEW ULTRA-LOW
OUTPUT SPECTRUM
EMI Spectrum Diagram
查询MAX9705供应商
PACKAGE
-40oC to +85oC 10 TDFN-10
-40oC to +85oC
-40oC to +85oC 12 UCSP-12
-40oC to +85oC 10 TDFN-10
-40oC to +85oC
-40oC to +85oC 12 UCSP-12
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= SHDN = 3.3V, GND = PGND = 0V, SYNC = GND (FFM), RL= ∞, RLconnected between OUT+ and OUT-, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
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 PGND .........................................................................6V
GND to PGND .......................................................-0.3V to +0.3V
PV
DD
to VDD..........................................................-0.3V to +0.3V
All Other Pins to GND.................................-0.3V to (V
DD
+ 0.3V)
Continuous Current Into/Out of PV
DD
/PGND/OUT_........±600mA
Continuous Input Current (all other pins) .........................±20mA
Duration of OUT_ Short Circuit to GND or PV
DD
........Continuous
Duration of Short Circuit Between OUT+ and OUT-.....Continuous
Continuous Power Dissipation (TA= +70°C)
10-Pin TDFN (derate 24.4mW/°C above +70°C) .....1951.2mW
10-Pin µMAX (derate 5.6mW/
o
C above +70°C) .........444.4mW
12-Bump UCSP (derate 6.1mW/°C above +70°C)........484mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering)
Reflow ..........................................................................+235°C
MAX9705
PARAMETER
CONDITIONS
UNITS
GENERAL
Supply Voltage Range V
DD
Inferred from PSRR test 2.5 5.5 V
Quiescent Current I
DD
5.4 7 mA
Shutdown Current I
SHDN
0.3 10 µA
Turn-On Time t
ON
30 ms
Input Resistance R
IN
TA = +25°C 12 20 kΩ
MAX9705A
1.0
MAX9705B
MAX9705C
Input Bias Voltage V
BIAS
Either input
MAX9705D
V
MAX9705A 1.9 2.0 2.1
MAX9705B 3.8 4.0 4.2
MAX9705C 5.7 6.0 6.3
Voltage Gain A
V
MAX9705D 9.5 10
V/V
Output Offset Voltage V
OS
TA = +25°C
mV
Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 56 dB
VDD = 2.5V to 5.5V, TA = +25°C 50 75
75
Power-Supply Rejection Ratio
(Note 3)
PSRR
200mV
P-P
ripple
60
dB
RL = 8Ω
Output Power P
OUT
THD+N = 1%,
f
IN
= 1kHz
R
L
= 4Ω
mW
RL = 8Ω,
P
OUT
= 450mW
Total Harmonic Distortion
Plus Noise
fIN = 1kHz, either FFM or
SSM
R
L
= 4Ω,
P
OUT
= 375mW
%
Into shutdown -68
Click/Pop Level K
CP
Peak voltage,
dB
SYMBOL
MIN TYP MAX
THD+N
A-weighted (Notes 3, 4)
0.88
0.73 0.83 0.93
0.61 0.71 0.81
0.48 0.56 0.64
f
= 217Hz
RIPPLE
f
= 20kHz
RIPPLE
Out of shutdown -60.5
±10 ±69
600
950
0.02
0.025
1.12
10.5
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= SHDN = 3.3V, GND = PGND = 0V, SYNC = GND (FFM), RL= ∞, RLconnected between OUT+ and OUT-, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: 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. For RL= 16Ω, L = 136µH.
Note 3: Inputs AC-coupled to GND.
Note 4: Testing performed with 8Ω resistive load in series with 68µH inductive load connected across BTL output. Mode transitions
are controlled by
SHDN pin. KCPlevel is calculated as 20 x log[(peak voltage under normal operation at rated power
level)/(peak voltage during mode transition, no input signal)]. Units are expressed in dB.
Note 5: SYNC has a 1MΩ resistor to V
REF
= 1.25V.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Slew Rate SR
V/µs
Rise/Fall Time
10% to 90% 15 ns
FFM 91
BW = 22Hz
to 22kHz
SSM 89
FFM 93
Signal-to-Noise Ratio SNR V
OUT
= 2V
RMS
SSM 91
dB
SYNC = GND 980
SYNC = float
Oscillator Frequency f
OSC
SYNC = VDD (SSM mode)
kHz
SYNC Frequency Lock Range 800
kHz
Efficiency η P
OUT
= 800mW, fIN = 1kHz, RL = 8Ω 89 %
DIGITAL INPUTS (SHDN, SYNC)
V
IH
2
Input Thresholds
V
IL
0.8
V
SHDN Input Leakage Current 0.1 ±10 µA
SYNC Input Current (Note 5)
±10 µA
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= SHDN = 5V, GND = PGND = 0V, SYNC = GND (FFM), RL= ∞, RLconnected between OUT+ and OUT-, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Quiescent Current I
DD
7mA
Shutdown Current I
SHDN
µA
f = 217Hz 75
Power-Supply Rejection Ratio PSRR
f = 20kHz 60
dB
RL = 16Ω
RL = 8Ω
Output Power P
OUT
THD+N = 1%,
f = 1kHz
R
L
= 4Ω
mW
RL = 8Ω, P
OUT
= 1.0W
Total Harmonic Distortion
Plus Noise
f = 1kHz, either
FFM or SSM
%
FFM 94
BW = 22Hz to
22kHz
SSM 91
FFM 97
Signal-to-Noise Ratio SNR
V
OUT
=
3V
RMS
A-weighted
SSM 93
dB
176
t
, t
RISE
FALL
A-weighted
1100 1220
1250 1450 1650
1220
±120
2000
-1.25
0.55
200mV
THD+N
ripple
P-P
RL = 4Ω, P
= 1.75W 0.05
OUT
750
1400
2300
0.02
100
00.51.01.5
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc04
OUTPUT POWER (W)
THD+N (%)
VDD = 3.3V
R
L
= 4Ω
fIN = 1kHz
100
01.00.5 2.01.5 2.5 3.0
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc05
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
VDD = 5.0V
R
L
= 4Ω
100
00.40.2 0.80.6 1.0 1.2
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc06
OUTPUT POWER (W)
THD+N (%)
VDD = 3.3V
R
L
= 8Ω
f
IN
= 1kHz
FFM
SSM
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc07
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 3.3V
R
L
= 8Ω
P
OUT
= 100mW
P
OUT
= 450mW
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc08
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 5.0V
R
L
= 8Ω
P
OUT
= 250mW
P
OUT
= 1W
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc09
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 2.5V
R
L
= 4Ω
P
OUT
= 50mW
P
OUT
= 300mW
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= 3.3V, SYNC = VDD(SSM), differential input, TA= +25°C, unless otherwise noted.)
100
00.40.81.00.2 0.6 1.2
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc01
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
VDD = 3.3V
R
L
= 8Ω
100
0 0.5 1.0 1.5 2.0
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc02
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
VDD = 5.0V
R
L
= 8Ω
100
0 0.2 0.4 0.6 0.8
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9705toc03
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
VDD = 2.5V
R
L
= 4Ω
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VDD= 3.3V, SYNC = VDD(SSM), differential input, TA= +25°C, unless otherwise noted.)
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc10
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 3.3V
R
L
= 4Ω
P
OUT
= 100mW
P
OUT
= 800mW
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc11
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 5.0V
R
L
= 4Ω
P
OUT
= 250mW
P
OUT
= 1.75W
100
0.01
10 100 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
10
MAX9705toc12
FREQUENCY (Hz)
THD+N (%)
1k
VDD = 3.3V
R
L
= 8Ω
P
OUT
= 450mW
FFM
SSM
100
00.5 1.51.0 2.0 2.5
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. COMMON-MODE VOLTAGE
MAX9705toc13
COMMON-MODE VOLTAGE (V)
THD+N (%)
VDD = 3.3V to 5V
f
IN
= 1kHz
P
OUT
= 500mW
GAIN = 6dB
R
L
= 8Ω
0
30
20
10
40
50
60
70
80
90
100
00.40.2 0.6 0.8 1.0
EFFICIENCY
vs. OUTPUT POWER
MAX9705toc14
OUTPUT POWER (W)
EFFICIENCY (%)
VDD = 3.3V
f
IN
= 1kHz
RL = 8Ω
R
L
= 4Ω
0
30
20
10
40
50
60
70
80
90
100
01.00.5 1.5 2.0 2.5 3.0
EFFICIENCY
vs. OUTPUT POWER
MAX9705toc15
OUTPUT POWER (W)
EFFICIENCY (%)
VDD = 5.0V
f
IN
= 1kHz
RL = 8Ω
RL = 4Ω
0
30
20
10
40
50
60
70
80
90
100
2.5 3.53.0 4.0 4.5 5.0 5.5
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX9705toc16
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
fIN = 1kHz
THD+N = 1%
RL = 8Ω
RL = 4Ω
0
30
20
10
40
50
60
70
80
90
100
800 12001000 1400 1600 1800 2000
EFFICIENCY
vs. SYNC FREQUENCY
MAX9705toc17
SYNC FREQUENCY (kHz)
EFFICIENCY (%)
VDD = 3.3V
f
IN
= 1kHz
THD+N = 1%
RL = 8Ω
RL = 4Ω
0
30
20
10
40
50
60
70
80
90
100
800 12001000 1400 1600 1800 2000
EFFICIENCY
vs. SYNC FREQUENCY
MAX9705toc18
SYNC FREQUENCY (kHz)
EFFICIENCY (%)
VDD = 5.0V
f
IN
= 1kHz
THD+N = 1%
RL = 8Ω
RL = 4Ω
-140
-120
-100
-80
-60
-40
-20
0
20
051015 20
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc25
FREQUENCY (kHz)
AMPLITUDE (dBV)
RL = 8Ω
V
DD
= 5.0V
f
IN
= 1kHz
A-WEIGHTED
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
6 _______________________________________________________________________________________
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9705toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
fIN = 1kHz
R
L
= 8Ω
THD+N = 1%
THD+N = 10%
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9705toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
fIN = 1kHz
R
L
= 4Ω
THD+N = 1%
THD+N = 10%
4.0
0
1 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE
1.5
1.0
3.0
2.0
3.5
0.5
2.5
MAX9705 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
fIN = 1kHz
Z
LOAD
= 33µH IN
SERIES WITH R
L
THD+N = 1%
3.3V
5.0V
0
-10
-100
10 100 10k 100k
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
-90
-50
-70
-80
-40
-60
-20
-30
MAX9705 toc22
FREQUENCY (Hz)
PSRR (dB)
1k
VDD = 3.3V
V
IN
= 200mV
P-P
RL = 8Ω
-140
-120
-100
-80
-60
-40
-20
0
20
051015 20
FIXED-FREQUENCY-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc23
FREQUENCY (kHz)
AMPLITUDE (dBV)
RL = 8Ω
V
DD
= 5.0V
f
IN
= 1kHz
BW = 22Hz to 22kHz
-140
-120
-100
-80
-60
-40
-20
0
20
051015 20
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc24
FREQUENCY (kHz)
AMPLITUDE (dBV)
RL = 8Ω
V
DD
= 5.0V
f
IN
= 1kHz
BW = 22Hz to 22kHz
Typical Operating Characteristics (continued)
(VDD= 3.3V, SYNC = VDD(SSM), differential input, TA= +25°C, unless otherwise noted.)
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 7
0
-140
01001000
WIDEBAND OUTPUT SPECTRUM
FIXED-FREQUENCY MODE
-80
-100
-20
-60
-120
-40
MAX9705 toc26
FREQUENCY (MHz)
AMPLITUDE (dBV)
10
RL = 8
Ω
V
DD
= 5.0V
INPUTS AC GROUNDED
0
-140
01001000
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODE
-80
-100
-20
-60
-120
-40
MAX9705 toc27
FREQUENCY (MHz)
AMPLITUDE (dBV)
10
RL = 8
Ω
V
DD
= 5.0V
INPUTS AC GROUNDED
4
5
6
7
8
9
10
2.5 3.5 4.5 5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9705 toc28
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SYNC = VDD (SSM)
SYNC = FLOAT (FFM)
SYNC = GND (FFM)
NO LOAD
INPUTS AC GROUNDED
5.00
5.25
5.50
5.75
6.25
6.00
6.50
6.75
7.00
-40 -15 10 35 60 85
SUPPLY CURRENT
vs. TEMPERATURE
MAX9705 toc29
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
SYNC = VDD (SSM)
SYNC = FLOAT (FFM)
SYNC = GND (FFM))
VDD = 3.3V
NO LOAD
INPUTS AC GROUNDED
0
0.10
0.20
0.30
0.50
0.40
0.60
0.80
0.70
0.90
1.00
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9705 toc30
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (µA)
TA = +25°C
TA = +85°C
TA = -40°C
NO LOAD
INPUTS AC GROUNDED
SHDN = GND
TURN-ON/TURN-OFF RESPONSE
MAX9705 toc31
MAX9705
OUTPUT
SHDN
0V
250mV/div
3V
10ms/div
f = 1kHz
R
L
= 8Ω
Typical Operating Characteristics (continued)
(VDD= 3.3V, SYNC = VDD(SSM), differential input, TA= +25°C, unless otherwise noted.)
Functional Diagram
MAX9705
2
(B1)
5
(B2)
3
(C1)
7
(B3)
( ) UCSP BUMP.
FIGURE SHOWS MAX9705 CONFIGURED FOR SPREAD-SPECTRUM OPERATION.
1µF
PGND
OUT+
OUT-
PV
DD
PGND
PGND
PV
DD
4
(C2)
GND
IN+
V
DD
2.5V TO 5.5V
1
(A1)
SHDN
IN-
UVLO/POWER
MANAGEMENT
CLASS D
MODULATOR
PV
DD
SYNC
10
(B4)
6
(A3)
8
(A4)
9
(C4)
CLICK-AND-POP
SUPPRESSION
OSCILLATOR
1µF
1µF
LOW-EMI
DRIVER
LOW-EMI
DRIVER
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
8 _______________________________________________________________________________________
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 9
Detailed Description
The MAX9705 ultra-low-EMI, filterless, Class D audio
power amplifier features several improvements to switchmode amplifier technology. The MAX9705 features output
driver active emissions limiting circuitry to reduce EMI.
Zero dead time technology maintains state-of-the-art efficiency and THD+N performance by allowing the output
FETs to switch simultaneously without cross-conduction.
A unique filterless modulation scheme, synchronizable
switching frequency, and spread-spectrum mode create
a compact, flexible, low-noise, efficient audio power
amplifier while occupying minimal board space. The differential input architecture reduces common-mode noise
pickup with or without the use of input-coupling capacitors. The MAX9705 can also be configured as a singleended input amplifier without performance degradation.
Thermal-overload and short-circuit protection prevent the
MAX9705 from being damaged during a fault condition.
The amplifier is disabled if the die temperature reaches
+150°C. The die must cool by 10°C before normal operation can continue. The output of the MAX9705 shuts down
if the output current reaches approximately 2A. Each output FET has its own short-circuit protection. This protection scheme allows the amplifier to survive shorts to either
supply rail. After a thermal overload or short circuit, the
device remains disabled for a minimum of 50µs before
attempting to return to normal operation. The amplifier will
shut down immediately and wait another 50µs before turning on if the fault condition is still present. This operation
will cause the output to pulse during a persistent fault.
Comparators monitor the MAX9705 inputs and compare the complementary input voltages to the sawtooth
waveform. The comparators trip when the input magnitude of the sawtooth exceeds their corresponding input
voltage. Both comparators reset at a fixed time after the
rising edge of the second comparator trip point, generating a minimum-width pulse t
ON(MIN)
at the output of
the second comparator (Figure 1). As the input voltage
increases or decreases, the duration of the pulse at one
output increases (the first comparator to trip), while the
other output pulse duration remains at t
ON(MIN)
. This
causes the net voltage across the speaker (V
OUT+
-
V
OUT-
) to change.
Operating Modes
Fixed-Frequency Modulation (FFM) Mode
The MAX9705 features two FFM modes. The FFM
modes are selected by setting SYNC = GND for a
1.1MHz switching frequency, and SYNC = FLOAT for a
1.45MHz switching frequency. In FFM mode, the frequency spectrum of the Class D output consists of the
fundamental switching frequency and its associated
harmonics (see the Wideband FFT graph in the Typical
Operating Characteristics). The MAX9705 allows the
switching frequency to be changed by +32%, should
the frequency of one or more of the harmonics fall in a
sensitive band. This can be done at any time and does
not affect audio reproduction.
Spread-Spectrum Modulation (SSM) Mode
The MAX9705 features a unique, patented spread-spectrum mode that flattens the wideband spectral components,
Pin Description
PIN BUMP
TDFN/µMAX
UCSP
NAME FUNCTION
1A1V
DD
Analog Power Supply
2B1IN+ Noninverting Audio Input
3C1IN- Inverting Audio Input
4C2GND Analog Ground
5B2SHDN Active-Low Shutdown Input. Connect to VDD for normal operation.
6A3SYNC
Frequency Select and External Clock Input.
SYNC = GND: Fixed-frequency mode with f
S
= 1100kHz.
SYNC = Float: Fixed-frequency mode with f
S
= 1450kHz.
SYNC = V
DD
: Spread-spectrum mode with fS = 1220kHz ±120kHz.
SYNC = Clocked: Fixed-frequency mode with f
S
= external clock frequency.
7B3PGND Power Ground
8A4OUT+ Amplifier-Output Positive Phase
9C4OUT- Amplifier-Output Negative Phase
10 B4 PV
DD
H-Bridge Power Supply
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
10 ______________________________________________________________________________________
improving EMI emissions by 5dB. Proprietary techniques
ensure that the cycle-to-cycle variation of the switching
period does not degrade audio reproduction or efficiency
(see the Typical Operating Characteristics). Select SSM
mode by setting SYNC = V
DD
. In SSM mode, the switching frequency varies randomly by ±120kHz around the
center frequency (1.22MHz). The modulation scheme
remains the same, but the period of the sawtooth waveform changes from cycle to cycle (Figure 2). Instead of a
large amount of spectral energy present at multiples of
the switching frequency, the energy is now spread over a
bandwidth that increases with frequency. Above a few
megahertz, the wideband spectrum looks like white noise
for EMI purposes (see the EMI Spectrum Diagram).
External Clock Mode
The SYNC input allows the MAX9705 to be synchronized
to a system clock moving the spectral components of the
switching harmonics to insensitive frequency bands.
Applying an external TTL clock of 800kHz to 2MHz to
SYNC synchronizes the switching frequency of the
MAX9705. The period of the SYNC clock can be randomized, enabling the MAX9705 to be synchronized to
another MAX9705 operating in SSM mode.
Filterless Modulation/Common-Mode Idle
The MAX9705 uses Maxim’s unique, patented modulation scheme that eliminates the LC filter required by
traditional Class D amplifiers, improving efficiency,
reducing component count, and conserving board
Figure 1. MAX9705 Outputs with an Input Signal Applied
OUT+
OUT-
V
IN-
V
IN+
V
OUT+
- V
OUT-
t
ON(MIN)
t
SW
Table 1. Operating Modes
SYNC INPUT MODE
GND FFM with fS = 1100kHz
FLOAT FFM with fS = 1450kHz
V
DD
Clocked FFM with fS = external clock frequency
SSM with fS = 1220kHz ±120kHz
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________ 11
space and system cost. Conventional Class D amplifiers
output a 50% duty cycle square wave when no signal is
present. With no filter, the square wave appears across
the load as a DC voltage, resulting in a finite load current, increasing power consumption. When no signal is
present at the input of the MAX9705, the outputs switch
as shown in Figure 3. Because the MAX9705 drives the
speaker differentially, the two outputs cancel each other,
resulting in no net idle-mode voltage across the speaker, minimizing power consumption.
Efficiency
Efficiency of a Class D amplifier is attributed to the
region of operation of the output stage transistors. In a
Class D amplifier, the output transistors act as currentsteering switches and consume negligible additional
power. Any power loss associated with the Class D output stage is mostly due to the I2R loss of the MOSFET
on-resistance and quiescent-current overhead.
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9705 still exhibits >70% efficiencies
under the same conditions (Figure 4).
Shutdown
The MAX9705 has a shutdown mode that reduces power
consumption and extends battery life. Driving SHDN low
places the MAX9705 in a low-power (0.3µA) shutdown
mode. Connect SHDN to VDDfor normal operation.
Figure 2. MAX9705 Output with an Input Signal Applied (SSM Mode)
V
OUT+
- V
OUT-
t
SW
t
SW
t
SW
t
SW
V
IN-
V
IN+
OUT+
OUT-
t
ON(MIN)
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
12 ______________________________________________________________________________________
Click-and-Pop Suppression
The MAX9705 features comprehensive click-and-pop
suppression that eliminates audible transients on startup and shutdown. While in shutdown, the H-bridge is in
a high-impedance state. During startup or power-up,
the input amplifiers are muted and an internal loop sets
the modulator bias voltages to the correct levels, preventing clicks and pops when the H-bridge is subsequently enabled. For 30ms following startup, a soft-start
function gradually unmutes the input amplifiers.
Applications Information
Filterless Operation
Traditional Class D amplifiers require an output filter to
recover the audio signal from the amplifier’s output. The
filters add cost, increase the solution size of the amplifier, and can decrease efficiency and THD+N performance. The traditional PWM scheme uses large
differential output swings (2 x VDDpeak-to-peak) and
causes large ripple currents. Any parasitic resistance in
the filter components results in a loss of power, lowering the efficiency.
The MAX9705 does not require an output filter. The
device relies on the inherent inductance of the speaker
coil and the natural filtering of both the speaker and the
human ear to recover the audio component of the
square-wave output. Eliminating the output filter results
in a smaller, less costly, more efficient solution.
Because the frequency of the MAX9705 output is well
beyond the bandwidth of most speakers, voice coil
movement due to the square-wave frequency is very
small. Although this movement is small, a speaker not
designed to handle the additional power can be damaged. For optimum results, use a speaker with a series
inductance >10µH. Typical 8Ω speakers exhibit series
inductances in the 20µH to 100µH range.
Power-Conversion Efficiency
Unlike a class AB amplifier, the output offset voltage of
a Class D amplifier does not noticeably increase quiescent-current draw when a load is applied. This is due to
the power conversion of the Class D amplifier. For example, an 8mV DC offset across an 8Ω load results in 1mA
extra current consumption in a Class AB device. In the
Class D case, an 8mV offset into 8Ω equates to an additional power drain of 8µW. Due to the high efficiency of
the Class D amplifier, this represents an additional quiescent-current draw of 8µW/(VDD/100η), which is on the
order of a few microamps.
Input Amplifier
Differential Input
The MAX9705 features a differential input structure,
making it compatible with many CODECs, and offering
improved noise immunity over a single-ended input
amplifier. In devices such as cellular phones, high-frequency signals from the RF transmitter can be picked
up by the amplifier’s input traces. The signals appear at
the amplifier’s inputs as common-mode noise. A differential input amplifier amplifies the difference of the two
inputs; any signal common to both inputs is canceled.
Single-Ended Input
The MAX9705 can be configured as a single-ended
input amplifier by capacitively coupling either input to
GND and driving the other input (Figure 5).
Figure 3. MAX9705 Outputs with No Input Signal
VIN = 0V
OUT-
OUT+
V
OUT+
- V
OUT-
= 0V
Figure 4. MAX9705 Efficiency vs. Class AB Efficiency
EFFICIENCY vs. OUTPUT POWER
OUTPUT POWER (W)
EFFICIENCY (%)
0.80.60.40.2
10
20
30
40
50
60
70
80
90
100
0
01.0
VDD = 3.3V
f
IN
= 1kHz
R
L
= 8Ω
CLASS AB
MAX9705
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________ 13
Note that the single-ended voltage range of the
MAX9705A is 3V
P-P
. This limits the achievable output
power for this device. Use higher gain versions
(MAX9705B, MAX9705C, MAX9705D) if higher output
power is desired in a single-ended application.
DC-Coupled Input
The input amplifier can accept DC-coupled inputs that
are biased within the amplifier’s common-mode range
(see the Typical Operating Characteristics). DC coupling eliminates the input-coupling capacitors, reducing component count to potentially one external
component (see the System Diagram). However, the
low-frequency rejection of the capacitors is lost, allowing low-frequency signals to feed through to the load.
Component Selection
Input Filter
An input capacitor, C
IN
, in conjunction with the input
resistance of the MAX9705 forms a highpass filter that
removes the DC bias from an incoming signal. The ACcoupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero source
impedance, the -3dB point of the highpass filter is
given by:
Choose C
IN
so f
-3dB
is well below the lowest frequency
of interest. Setting f
-3dB
too high affects the lowfrequency response of the amplifier. Use capacitors
whose dielectrics have low-voltage coefficients, such
as tantalum or aluminum electrolytic. Capacitors with
high-voltage coefficients, such as ceramics, may result
in increased distortion at low frequencies.
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat gain response between 20Hz and
20kHz, portable voice-reproduction devices such as
cellular phones and two-way radios need only concentrate on the frequency range of the spoken human
voice (typically 300Hz to 3.5kHz). In addition, speakers
used in portable devices typically have a poor response
below 150Hz. Taking these two factors into consideration, the input filter may not need to be designed for a
20Hz to 20kHz response, saving both board space and
cost due to the use of smaller capacitors.
Output Filter
The MAX9705 does not require an output filter. The
device passes FCC emissions standards with 24in of
unshielded twisted-pair speaker cables. However, an
output filter can be used if a design is failing radiated
emissions due to board layout or excessive cable
length, or the circuit is near EMI-sensitive devices.
Supply Bypassing/Layout
Proper power-supply bypassing ensures low-distortion
operation. For optimum performance, bypass VDDto
GND and PVDDto PGND with separate 1µF capacitors
as close to each pin as possible. A low-impedance,
high-current power-supply connection to PVDDis
assumed. Additional bulk capacitance should be added
as required depending on the application and powersupply characteristics. GND and PGND should be star
connected to system ground. Refer to the MAX9705
evaluation kit for layout guidance.
Stereo Configuration
Two MAX9705s can be configured as a stereo amplifier
(Figure 6). Device U1 is the master amplifier; its unfiltered output drives the SYNC input of the slave device
(U2), synchronizing the switching frequencies of the two
devices. Synchronizing two MAX9705s ensures that no
beat frequencies occur within the audio spectrum. This
configuration works when the master device is in either
FFM or SSM mode. There is excellent THD+N performance and minimal crosstalk between devices due to
the SYNC connection (Figures 7 and 8). U2 locks onto
only the frequency present at SYNC, not the pulse
width. The internal feedback loop of device U2 ensures
that the audio component of U1’s output is rejected.
f
RC
dB
IN IN
−
=
3
1
2π
Figure 5. Single-Ended Input
1µF
IN+
IN-
1µF
SINGLE-ENDED
AUDIO INPUT
MAX9705
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
Designing with Volume Control
The MAX9705 can easily be driven by single-ended
sources (Figure 5), but extra care is needed if the
source impedance “seen” by each differential input is
unbalanced, such as the case in Figure 9a, where the
MAX9705 is used with an audio taper potentiometer
acting as a volume control. Functionally, this configuration works well, but can suffer from click-pop transients
at power-up (or coming out of SHDN) depending on the
volume-control setting. As shown, the click-pop performance is fine for either max or min volume, but worsens
at other settings.
One solution is the configuration shown in Figure 9b. The
potentiometer is connected between the differential
inputs, and these “see” identical RC paths when the
device powers up. The variable resistive element appears
between the two inputs, meaning the setting affects both
inputs the same way. The potentiometer is audio taper, as
in Figure 9a. This significantly improves transient performance on power-up or release from SHDN. A similar
approach can be applied when the MAX9705 is driven
differentially and a volume control is required.
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, PC board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on
reliability testing results, refer to Application Note:
UCSP—A Wafer-Level Chip-Scale Package available on
Maxim’s website at www.maxim-ic.com/ucsp.
Figure 6. Master-Slave Stereo Configuration
IN+
IN-
OUT+
OUT-
SYNC
1µF
RIGHT-CHANNEL
DIFFERENTIAL
AUDIO INPUT
MAX9705
V
DD
V
DD
PV
DD
IN+
IN-
OUT+
OUT-
SYNC
1µF
LEFT-CHANNEL
DIFFERENTIAL
AUDIO INPUT
MAX9705
V
DD
PV
DD
Figure 7. Master-Slave THD+N
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
OUTPUT POWER (W)
THD+N (%)
0.60.40.2
0.01
0.1
1
10
100
0.001
00.8
VDD = 3.3V
SLAVE DEVICE
f
IN
= 1kHz
SYNC = GND (FFM)
R
L
= 8Ω
Figure 8. Master-Slave Crosstalk
14 ______________________________________________________________________________________
CROSSTALK vs. FREQUENCY
0
VDD = 3.3V
-10
= 500mV
V
IN
-20
fIN = 1kHz
SYNC = GND (FFM)
-30
R
-40
-50
-60
-70
CROSSTALK (dB)
-80
-90
-100
-110
10 100k
P-P
= 8Ω
L
MASTER TO SLAVE
SLAVE TO MASTER
FREQUENCY (Hz)
10k1k100
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________ 15
Figure 9a. Single-Ended Drive of MAX9705 Plus Volume
IN+
1µF
1µF
MAX9705
IN-
CW
50kΩ
Figure 9b. Improved Single-Ended Drive of MAX9705 Plus
Volume
Ordering Information (continued)
PART
TEMP RANGE
PIN-
TOP
MARK
MAX9705CETB+T
ACZ
MAX9705CEUB+
10 µMAX —
MAX9705CEBC+T
ACI
MAX9705DETB+T
ADA
MAX9705DEUB+
10 µMAX —
MAX9705DEBC+T
ACJ
Selector Guide
PART PIN-PACKAGE
GAIN (dB)
MAX9705AETB+T 10 TDFN-10 6
MAX9705AEUB+ 10 µMAX 6
MAX9705AEBC+T 12 UCSP-12 6
MAX9705BETB+T 10 TDFN-10 12
MAX9705BEUB+ 10 µMAX 12
MAX9705BEBC+T 12 UCSP-12 12
MAX9705CETB+T 10 TDFN-10 15.6
MAX9705CEUB+ 10 µMAX 15.6
MAX9705CEBC+T 12 UCSP-12 15.6
MAX9705DETB+T 10 TDFN-10 20
MAX9705DEUB+ 10 µMAX 20
MAX9705DEBC+T 12 UCSP-12 20
Pin Configurations
+Denotes lead-free package.
1µF
22kΩ
TOP VIEW
+
V
1
DD
IN+
2
IN-
MAX9705
3
4
5
µMAX
DD
PV
OUT+
OUT-IN+
10 987 6
PGND
10
PV
DD
OUT-
9
OUT+
8
PGNDGND
7
SYNCSHDN
6
SYNCSHDN
IN-
MAX9705
IN+
1µF
CW
50kΩ
22kΩ
MAX9705
+
1 234 5
DD
IN-
V
TOP VIEW
(BUMP SIDE DOWN)
1
V
DD
A
IN+
B
C
SHDN
IN-
GND
GND
TDFN
MAX9705
234
SYNC
OUT+
PV
PGND
OUT-
UCSP
DD
PACKAGE
-40oC to +85oC 10 TDFN-10
-40oC to +85oC
-40oC to +85oC 12 UCSP-12
-40oC to +85oC 10 TDFN-10
-40oC to +85oC
-40oC to +85oC 12 UCSP-12
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
16 ______________________________________________________________________________________
Chip Information
TRANSISTOR COUNT: 3595
PROCESS: BiCMOS
MAX4063
MAX9705
MAX9722
CODEC/
BASEBAND
PROCESSOR
AUX_IN
BIAS
IN+
IN-
OUT
IN+
V
DD
OUT+
OUT-
INL
INR
C1P CIN
SV
SS
PV
SS
OUTR
OUTL
V
DD
V
DD
0.1µF
0.1µF
0.1µF
2.2kΩ
2.2kΩ
V
DD
V
DD
µCONTROLLER
IN-
PV
DD
SYNC
OUT
1µF
1µF
1µF
1µF
1µF
1µF
SHDN
SHDN
System Diagram
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________ 17
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
12L, UCSP 4x3.EPS
F
1
1
21-0104
PACKAGE OUTLINE, 4x3 UCSP
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
18 ______________________________________________________________________________________
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
6, 8, &10L, DFN THIN.EPS
L
C
L
C
PIN 1
INDEX
AREA
D
E
L
e
L
A
e
E2
N
G
1
2
21-0137
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
k
e
[(N/2)-1] x e
REF.
PIN 1 ID
0.35x0.35
DETAIL A
b
D2
A2
A1
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________ 19
COMMON DIMENSIONS
SYMBOL
MIN. MAX.
A
0.70 0.80
D
2.90 3.10
E
2.90 3.10
A1
0.00 0.05
L
0.20 0.40
PKG. CODE
N
D2 E2 e
JEDEC SPEC
b
[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.30±0.101.50±0.106T633-1 0.95 BSC MO229 / WEEA 1.90 REF0.40±0.05
1.95 REF0.30±0.05
0.65 BSC
2.30±0.108T833-1
2.00 REF0.25±0.05
0.50 BSC
2.30±0.1010T1033-1
2.40 REF0.20±0.05- - - -
0.40 BSC
1.70±0.10 2.30±0.1014T1433-1
1.50±0.10
1.50±0.10
MO229 / WEEC
MO229 / WEED-3
0.40 BSC
- - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC
MO229 / WEEA
0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10
0.65 BSC MO229 / WEEC
0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10
0.65 BSC MO229 / WEEC
0.30±0.05 1.95 REF
-DRAWING NOT TO SCALE-
G
2
2
21-0137
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
DOWNBONDS
ALLOWED
NO
NO
NO
NO
YES
NO
YES
NO
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
10LUMAX.EPS
PACKAGE OUTLINE, 10L uMAX/uSOP
1
1
21-0061
I
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
1
0.498 REF
0.0196 REF
S
6°
SIDE VIEW
α
BOTTOM VIEW
0° 0° 6°
0.037 REF
0.0078
MAX
0.006
0.043
0.118
0.120
0.199
0.0275
0.118
0.0106
0.120
0.0197 BSC
INCHES
1
10
L1
0.0035
0.007
e
c
b
0.187
0.0157
0.114
H
L
E2
DIM
0.116
0.114
0.116
0.002
D2
E1
A1
D1
MIN
-A
0.940 REF
0.500 BSC
0.090
0.177
4.75
2.89
0.40
0.200
0.270
5.05
0.70
3.00
MILLIMETERS
0.05
2.89
2.95
2.95
-
MIN
3.00
3.05
0.15
3.05
MAX
1.10
10
0.6±0.1
0.6±0.1
Ø0.50±0.1
H
4X S
e
D2
D1
b
A2
A
E2
E1
L
L1
c
α
GAGE PLANE
A2 0.030 0.037 0.75 0.95
A1
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