MAXIM MAX9717 User Manual

General Description
The MAX9716/MAX9717 audio power amplifiers are ideal for portable audio devices with internal speakers. A bridge-tied load (BTL) architecture minimizes external component count, while providing high-quality audio reproduction. Both devices deliver 1.4W continuous power into a 4load with less than 1% Total Harmonic Distortion (THD) while operating from a single +5V sup­ply. With an 8load, both devices deliver 1W continuous power. These devices also deliver 350mW continuous power into an 8load while operating from a single +3.0V supply. The devices are available as adjustable gain amplifiers (MAX9716/MAX9717A) or with internally fixed gains of 6dB, 9dB, and 12dB (MAX9717B/ MAX9717C/MAX9717D), reducing component count.
A low-power shutdown mode disables the bias generator and amplifiers, reducing quiescent current consumption to less than 10nA. These devices feature Maxim’s industry-leading, comprehensive click-and-pop sup­pression that reduces audible clicks and pops during startup and shutdown.
The MAX9717 features a headphone sense input (BTL/SE) that senses when a headphone is connected to the device, disables the BTL slave driver, muting the speaker while driving the headphone as a single-ended load.
The MAX9716 is pin compatible with the LM4890 and is available in 9-bump UCSP™, 8-pin TDFN (3mm x 3mm), and 8-pin µMAX®packages. The MAX9717 is available in 9-bump UCSP, 8-pin TDFN, and 8-pin µMAX packages. Both devices operate over the -40°C to +85°C extended temperature range.
Applications
Features
o 2.7V to 5.5V Single-Supply Operation o 1.4W into 4at 1% THD+N
o 10nA Low-Power Shutdown Mode
o 73dB PSRR at 1kHz
o No Audible Clicks or Pops at Power-Up/Down
o Internal Fixed Gain to Reduce Component Count
(MAX9717B/C/D)
o Adjustable Gain Option (MAX9716/MAX9717A) o BTL /SE Input Senses when Headphones are
Connected (MAX9717)
o Pin Compatible with LM4890 (MAX9716)
o Pin Compatible with TPA711 (MAX9717A)
o Available in Compact, Thermally Enhanced µMAX
and TDFN (3mm x 3mm) Packages
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
Simplified Block Diagrams
19-3146; Rev 3; 3/12
Pin Configurations and Selector Guide appear at end of data sheet.
EVALUATION KIT
AVAILABLE
UCSP is a trademark of Maxim Integrated Products, Inc. µMAX is a registered trademark of Maxim Integrated Products, Inc.
*
EP = Exposed pad.
+
Denotes a lead(Pb)-free/RoHS-compliant package. G45 indicates protective die coating. /V denotes automotive qualified part.
Ordering Information continued at end of data sheet.
Mobile Phones
PDAs
Portable Devices
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.
PART TEMP RANGE
MAX9716ETA+T -40°C to +85°C 8 TDFN-EP* Adj.
MAX9716EBL+TG45 -40°C to +85°C 3 x 3 UCSP Adj.
MAX9716EUA -40°C to +85°C 8 µMAX-EP* Adj.
MAX9716EUA/V+ -40°C to +85°C 8 µMAX-EP* Adj.
PIN­PACKAGE
GAIN
(dB)
SINGLE SUPPLY
2.7V TO 5.5V
BIAS
MAX9716
IN-
IN-
SINGLE SUPPLY
2.7V TO 5.5V
BIAS
MAX9717B/C/D
BTL/SE
V
CC
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—5V Supply
(VCC= 5V, V
GND
= 0V, SHDN = VCC, TA= +25°C. C
BIAS
= 1µF, RIN= RF= 20k(MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), R
L
= connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 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.
Supply Voltage (VCCto GND) ..................................-0.3V to +6V
Any Other Pin to GND ...............................-0.3V to (V
CC
+ 0.3V)
IN_, BIAS, SHDN, BTL/SE Continuous Current...................20mA
OUT_ Short-Circuit Duration to GND or V
CC
(Note 1)...Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
8-Pin µMAX (derate 10.3mW/°C above +70°C) ...........825mW
9-Bump UCSP (derate 5.2mW/°C above 70°C)...........412mW
Operating Temperature Range ..........................-40°C to +85°C
Maximum Junction Temperature ....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-Free Packages..............................................+260°C
Packages Containing Lead(Pb)....................................+240°C
Supply Voltage V
Quiescent Supply Current I
Shutdown Supply Current I
SHDN Threshold
BTL/SE Threshold
Common-Mode Bias Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
SHDN
V
V
V
V
BIAS
Inferred by PSRR test 2.7 5.5 V
V
= V
IN+
= V
IN-
= -40°C to +85°C
T
A
SHDN = GND 0.01 1 µA
IH
IL
IH
IL
(Note 4)
(Note 3),
BIAS
4.3 8 mA
1.2
0.4
0.9 x V
CC
0.7 x V
CC
V
CC
- 6%
/2
V
CC
V
/2
CC
/2
+ 6%
V
V
V
Output Offset Voltage V
OS
Power-Supply Rejection Ratio PSRR
Output Power P
Total Harmonic Distortion Plus Noise
OUT
THD+N
Output Noise Density e
V
= V
IN-
VCC = 2.7V to 5.5V DC, V
V
= V
IN+
V
RIPPLE
= 8 (Note 6)
R
L
RL = 8, THD+N = 1%, f
RL = 4, THD+N = 1%, f
RL = 16, BTL/SE = VCC (single-ended mode), THD+N = 1%, f
A
= 6dB, RL = 8, fIN = 1kHz,
V
P
OUT
fIN = 10kHz 106 nV/Hz
n
, V
OUT+
BIAS
= 200mV
= V
IN+
,
P-P
= 0.5W (Note 8)
(Note 5) ±7 ±15 mV
BIAS
= 1.5V 60 80
BIAS
f = 217Hz 61
,
f = 1kHz 73
= 1kHz (Note 7) 0.8 1.1
IN
= 1kHz (Note 7) 1.4
IN
= 1kHz
IN
0.155
0.024 %
Signal-to-Noise Ratio SNR THD+N = 1% 105 dB
dB
W
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—5V Supply (continued)
(VCC= 5V, V
GND
= 0V, SHDN = VCC, TA= +25°C. C
BIAS
= 1µF, RIN= RF= 20k(MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), R
L
= connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)
ELECTRICAL CHARACTERISTICS—3V Supply
(VCC= 3V, V
GND
= 0V, SHDN = VCC, TA= +25°C. C
BIAS
= 1µF, RIN= RF= 20k(MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), R
L
= connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)
Output Short-Circuit Current Limit I
Thermal Shutdown Threshold +160 °C
Thermal Shutdown Hysteresis 15 °C
Power-Up/Enable from Shutdown Time (Note 10)
Shutdown Time t
Input Resistance R
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SC
t
PU
SHDN
(Note 9) 1.1 A
250
C
= 0.1µF 25
BIAS
s
MAX9717B/C/D 12 20 28 k
IN
Quiescent Supply Current I
Shutdown Supply Current I
SHDN Threshold
BTL/SE Threshold
Common-Mode Bias Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
= V
CC
SHDN
V
IH
V
IL
V
IH
V
IL
BIAS
IN+
= V
IN-
T
= -40°C to +85°C
A
SHDN = GND 0.01 1 µA
(Note 4)
BIAS
(Note 3),
1.2
0.9 x V
V
CC
- 9%
CC
4 8.0 mA
/2
/2
V
CC
0.4
0.7 x V
CC
V
CC
+ 9%
/2
ms
V
V
V
Output Offset Voltage V
OS
Power-Supply Rejection Ratio PSRR
Output Power P
Total Harmonic Distortion Plus Noise
OUT
THD+N
Output-Noise Density e
V
= V
IN-
= V
V
IN+
V
RIPPLE
= 8 (Note 6)
R
L
RL = 8, THD+N = 1%, f
RL = 4, THD+N = 1%, f
AV = 6dB, RL = 8, fIN = 1kHz, P
OUT
fIN = 10kHz 106 nV/Hz
n
, V
= V
OUT+
,
BIAS
= 200mV
IN+
P-P
(Note 5) ±7 ±15 mV
BIAS
f = 217Hz 61
,
f = 1kHz 73
= 1kHz (Note 7) 350
IN
= 1kHz (Note 7) 525
IN
= 0.5W, VCC = 3V (Note 8)
0.024 %
dB
mW
Signal-to-Noise Ratio SNR THD+N = 1% 100 dB
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—3V Supply (continued)
(VCC= 3V, V
GND
= 0V, SHDN = VCC, TA= +25°C. C
BIAS
= 1µF, RIN= RF= 20k(MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), R
L
= connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)
Note 1: Continuous power dissipation must also be observed. Note 2: All specifications are tested at T
A
= +25°C. Specifications over temperature (TA = T
MIN
to T
MAX
) are not production tested,
and guaranteed by design.
Note 3: Quiescent power-supply current is specified and tested with no load. Quiescent power-supply current depends on the off-
set voltage when a practical load is connected to the amplifier.
Note 4: Common-mode bias voltage is the voltage on BIAS and is nominally V
CC
/2.
Note 5: V
OS
= V
OUT+
- V
OUT-.
Note 6: The amplifier input IN- is AC-coupled to GND through CIN. Note 7: Output power is specified by a combination of a functional output current test and characterization analysis. Note 8: Measurement bandwidth for THD+N is 22Hz to 22kHz. Note 9: Extended short-circuit conditions result in a pulsed output. Note 10: Time for V
OUT
to rise to 50% of final DC value.
Output Short-Circuit Current Limit I
Thermal Shutdown Threshold +160 °C
Thermal Shutdown Hysteresis 15 °C
Power-Up/Enable from Shutdown Time (Note 10)
Shutdown Time t
Input Resistance R
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SC
t
PU
SHDN
IN
(Note 9) 1.1 A
250
C
= 0.1µF 25
BIAS
s
MAX9717B/C/D 12 20 28 k
ms
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
_______________________________________________________________________________________
5
Typical Operating Characteristics
(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 5V
= 8
R
L
= 6dB
A
10
V
1
THD+N (%)
0.1
0.01
0.001
OUTPUT POWER = 800mW
OUTPUT POWER = 30mW
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 3V
= 8
R
L
= 12dB
A
10
V
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 5V
= 8
R
MAX9716 toc01
THD+N (%)
10k1k100
L
= 12dB
A
10
V
1
0.1
0.01
0.001
OUTPUT POWER = 800mW
OUTPUT POWER = 200mW
10 100k
FREQUENCY (Hz)
10k1k100
MAX9716 toc02
THD+N (%)
0.001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 5V
= 4
R
MAX9716 toc04
L
= 6dB
A
10
V
MAX9716 toc05
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 3V
= 8
R
L
= 6dB
A
10
V
1
0.1
0.01
OUTPUT POWER = 250mW
OUTPUT POWER = 30mW
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 5V
= 4
R
L
= 12dB
A
10
V
MAX9716 toc03
10k1k100
MAX9716 toc06
1
THD+N (%)
0.1
0.01
0.001
OUTPUT POWER = 200mW
OUTPUT POWER = 50mW
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 3V
= 4
R
L
A
= 6dB
10
V
1
THD+N (%)
0.01
0.001
OUTPUT POWER = 350mW
0.1
OUTPUT POWER = 50mW
10 100k
FREQUENCY (Hz)
1
THD+N (%)
0.1
0.01
0.001
10k1k100
10 100k
OUTPUT POWER = 1W
OUTPUT POWER = 200mW
10k1k100
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VCC = 3V
= 4
R
MAX9716 toc07
THD+N (%)
10k1k100
L
A
= 12dB
10
V
1
0.1
0.01
0.001
OUTPUT POWER = 350mW
OUTPUT POWER = 50mW
10 100k
FREQUENCY (Hz)
MAX9716 toc08
10k1k100
1
THD+N (%)
0.1
0.01
0.001
OUTPUT POWER = 1W
OUTPUT POWER = 250mW
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (SINGLE-ENDED)
100
VCC = 5V
= 16
R
L
10
A
= 12dB
V
1
0.1
THD+N (%)
0.01
0.001
0.0001
OUTPUT POWER = 125mW
OUTPUT POWER = 25mW
10 100k
FREQUENCY (Hz)
10k1k100
MAX9716 toc09
10k1k100
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc10
OUTPUT POWER (W)
THD+N (%)
1.21.00.80.60.40.2
0.01
0.1
1
10
100
0.001
01.4
VCC = 5V R
L
= 8
A
V
= 6dB
fIN = 100Hz
fIN = 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc12
OUTPUT POWER (mW)
THD+N (%)
400300200100
0.01
0.1
1
10
100
0.001 0 500
VCC = 3V R
L
= 8
A
V
= 6dB
fIN = 100Hz
fIN = 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc13
OUTPUT POWER (mW)
THD+N (%)
400300200100
0.01
0.1
1
10
100
0.001 0 500
VCC = 3V R
L
= 8
A
V
= 12dB
fIN = 100Hz
fIN = 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc14
OUTPUT POWER (W)
THD+N (%)
1.81.61.41.21.00.80.60.40.2
0.01
0.1
1
10
100
0.001
02.0
VCC = 5V R
L
= 4
A
V
= 6dB
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc17
OUTPUT POWER (mW)
THD+N (%)
700600500400300200100
0.01
0.1
1
10
100
0.001 0 800
VCC = 3V R
L
= 4
A
V
= 12dB
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SINGLE-ENDED)
MAX9716 toc18
OUTPUT POWER (mW)
THD+N (%)
225200175150125100755025
0.01
0.1
1
10
100
0.001 0250
VCC = 5V R
L
= 16
A
V
= 6dB
fIN = 100Hz
fIN = 10kHz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS
100
10
NOISE vs. OUTPUT POWER
VCC = 5V
= 8
R
L
= 12dB
A
V
1
MAX9716 toc11
THD+N (%)
0.001
TOTAL HARMONIC DISTORTION PLUS
100
10
NOISE vs. OUTPUT POWER
VCC = 3V
= 4
R
L
A
= 6dB
V
MAX9716 toc16
0.1
0.01
fIN = 10kHz
fIN = 1kHz
0
fIN = 100Hz
1.41.21.00.80.60.40.2
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
VCC = 5V
= 4
R
L
= 12dB
A
V
10
1
fIN = 10kHz
THD+N (%)
0.1
0.01
0.001
fIN = 100Hz
02.0
fIN = 1kHz
OUTPUT POWER (W)
MAX9716 toc15
1.81.61.41.21.00.80.60.40.2
1
THD+N (%)
0.1
0.01
0.001 0 800
fIN = 1kHz
fIN = 100Hz
OUTPUT POWER (mW)
fIN = 10kHz
700600500400300200100
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)
OUTPUT POWER
vs. SUPPLY VOLTAGE
1.8 RL = 8
f = 1kHz
1.5
= 6dB
A
V
1.2
0.9
0.6
OUTPUT POWER (W)
0.3
0
2.5 5.5
THD+N = 10%
THD+N = 1%
SUPPLY VOLTAGE (V)
OUTPUT POWER
vs. LOAD RESISTANCE
700
600
500
400
300
OUTPUT POWER (mW)
200
100
THD+N = 1%
THD+N = 10%
5.04.54.03.53.0
VCC = 3V f = 1kHz
= 6dB
A
V
3.0
2.5
MAX9716 toc19
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
1.0
MAX9716 toc22
0.8
0.6
0.4
POWER DISSIPATION (W)
0.2
OUTPUT POWER
vs. SUPPLY VOLTAGE
RL = 4 f = 1kHz
= 6dB
A
V
SUPPLY VOLTAGE (V)
POWER DISSIPATION
vs. OUTPUT POWER
VCC = 5V
= 8
R
L
f = 1kHz
= 6dB
A
V
THD+N = 10%
THD+N = 1%
5.04.54.03.53.02.5 5.5
2.5
MAX9716 toc20
2.0
1.5
1.0
OUTPUT POWER (mW)
0.5
0
300
250
MAX9716 toc23
200
150
100
POWER DISSIPATION (mW)
50
VCC = 5V f = 1kHz A
1100
OUTPUT POWER
vs. LOAD RESISTANCE
= 6dB
V
THD+N = 1%
LOAD RESISTANCE (Ω)
POWER DISSIPATION
vs. OUTPUT POWER
VCC = 3V
= 8
R
L
f = 1kHz
= 6dB
A
V
MAX9716 toc21
THD+N = 10%
10
MAX9716 toc24
0
101 100
LOAD RESISTANCE (Ω)
POWER DISSIPATION
0
01.5
POWER DISSIPATION
vs. OUTPUT POWER
2.0 VCC = 5V
= 4
R
L
f = 1kHz
1.6 A
= 6dB
V
1.2
0.8
POWER DISSIPATION (W)
0.4
0
02.0 OUTPUT POWER (W)
1.61.20.80.4
700
600
MAX9716 toc25
500
400
300
200
POWER DISSIPATION (mW)
100
0
0 700
VCC = 3V
= 4
R
L
f = 1kHz
= 6dB
A
V
OUTPUT POWER (W)
vs. OUTPUT POWER
OUTPUT POWER (mW)
1.20.90.60.3
0
OUTPUT POWER (mW)
4003002001000 500
OUTPUT-NOISE DENSITY
vs. FREQUENCY
600
500
Hz)
MAX9716 toc26
400
300
200
OUTPUT-NOISE DENSITY (nV/
100
0
600500400300200100
100 100k
FREQUENCY (Hz)
AV = 6dB
MAX9716 toc27
10k1k
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. V
CC
MAX9716 toc30
VCC (V)
SUPPLY CURRENT (mA)
5.14.73.1 3.5 3.9 4.3
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.0
2.7 5.5
SHUTDOWN CURRENT vs. V
CC
MAX9716 toc34
VCC (V)
SHUTDOWN CURRENT (nA)
5.04.54.03.53.0
2
4
6
8
10
12
14
16
18
20
0
2.5 5.5
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX9716 toc35
TEMPERATURE (°C)
SHUTDOWN CURRENT (nA)
6035-15 10
5
10
15
20
25
30
35
40
0
-40 85
VCC = 5V
VCC = 3V
GAIN AND PHASE vs. FREQUENCY
120
AV = 60dB
90
60
30
0
-30
GAIN AND PHASE (°/dB)
-60
-90
-120 10 10M
FREQUENCY (Hz)
1M100k100 1k 10k
MAX9716 toc28
PSRR (dB)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
SUPPLY CURRENT
vs. TEMPERATURE
6
5
4
3
SUPPLY CURRENT (mA)
2
1
VCC = 5V
VCC = 3V
-40 85
TEMPERATURE (°C)
603510-15
MAX9716 toc31
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
10 100k
FREQUENCY (Hz)
COMING OUT OF SHUTDOWN
RL = 8
100ms/div
10k1k100
MAX9716 toc32
MAX9716 toc29
SHDN 2V/div
OUT+ 1V/div
OUT­1V/div
OUT+ - OUT­200mV/div
GOING INTO SHUTDOWN
10µs/div
MAX9716 toc33
RL = 8
SHDN 2V/div
OUT+ 1V/div OUT­1V/div
OUT+ - OUT­200mV/div
Detailed Description
The MAX9716/MAX9717 are 1.3W BTL speaker ampli­fiers. Both devices feature a low-power shutdown mode, and industry-leading click-and-pop suppression. The MAX9717 features a headphone sense input that disables the slave BTL amplifier to drive the headphone as a single-ended load. These devices consist of high output-current audio amps configured as BTL ampli­fiers (see
Functional Diagrams
). The closed-loop gain of the input op amp sets the single-ended gain of the device. Two external gain resistors set the gain of the MAX9716 and MAX9717A (see the
Gain-Setting
Resistor
section). The MAX9717B/C/D feature internally
set gains of 6dB, 9dB, and 12dB, respectively.
The output of the first amplifier serves as the input of the second amplifier, which is configured as an inverting unity-gain follower. This results in two outputs, identical in amplitude, but 180° out-of-phase.
BIAS
The MAX9716/MAX9717 operate from a single 2.7V to
5.5V supply and feature an internally generated, common­mode bias voltage of VCC/2 referenced to ground. BIAS provides both click-and-pop suppression and sets the DC bias level for the audio outputs. The MAX9716 can be configured as a single-ended or differential input. For sin­gle-ended input, connect the noninverting input IN+ to BIAS externally. The MAX9717 BIAS is internally connect­ed to the amplifier noninverting input IN+.
The MAX9717 can only be used with a
single-ended input. Always bypass BIAS to ground with a capacitor. Choose the value of the bypass capacitor as described in the
BIAS Capacitor
section. Do not connect external loads to BIAS. Any load lowers the BIAS voltage, affecting the overall performance of the device.
BTL
/SE Control Input
The MAX9717 features a headphone sense input, BTL/SE, that enables headphone jack sensing to con­trol the power amplifier output configuration. Driving
BTL/SE low enables the slave amplifier (OUT-). Driving BTL/SE high disables the slave amplifier.
Shutdown Mode
The MAX9716/MAX9717 feature a low-power shutdown mode that reduces quiescent current consumption to 10nA. Entering shutdown disables the bias circuitry, forces the amplifier outputs to GND through an internal 20kresistor. Drive SHDN low to enter shutdown mode; drive SHDN high for normal operation.
Click-and-Pop Suppression
The MAX9716/MAX9717 feature Maxim’s industry-leading click-and-pop suppression circuitry. During startup, the amplifier common-mode bias voltage ramps to the DC bias. When entering shutdown, the amplifier outputs are pulled to GND through an internal 20kresistor. This scheme minimizes the energy present in the audio band.
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
_______________________________________________________________________________________ 9
Pin/Bump Description
PIN BUMP
TDFN/µMAX UCSP
MAX9716 MAX9717 MAX9716 MAX9717
1 1 C3 C3 SHDN Active-Low Shutdown
2 2 C1 C1 BIAS
3 A3 IN+ Noninverting Input
4 4 A1 A1 IN- Inverting Input
5 5 A2 A2 OUT+ Bridge Amplifier Positive Output
6 6 B3 B3 V
7 7 B1, B2 B1, B2 GND Ground
8 8 C2 C2 OUT-
—3—A3BTL/SE
EP Exposed Pad (TDFN and µMAX Only). Connect EP to GND.
NAME FUNCTION
DC Bias Bypass Capacitor Connection. Bypass BIAS to ground with a 1µF capacitor.
Power Supply. Bypass VCC with a 1µF capacitor to ground.
CC
Bridge Amplifier Negative Output. OUT- becomes high-impedance when BTL/SE is driven high.
BTL/Single-Ended Mode Input. Logic low sets the device in BTL mode. Logic high sets the device in single-ended mode.
MAX9716/MAX9717
Applications Information
BTL Amplifier
The MAX9716/MAX9717 are designed to drive a load differentially, a configuration referred to as bridge-tied load or BTL. The BTL configuration (Figure 1) offers advantages over the single-ended configuration, where one side of the load is connected to ground. Driving the load differentially doubles the output voltage compared to a single-ended amplifier under similar conditions. Thus, the differential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is given by:
Substituting 2 x V
OUT(P-P)
for V
OUT(P-P)
into the following equations yields four times the output power due to doubling of the output voltage:
There is no net DC voltage across the load because the differential outputs are each biased at midsupply. This eliminates the need for DC-blocking capacitors required for single-ended amplifiers. These capacitors can be large and expensive, consume board space, and degrade low-frequency performance.
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9716/ MAX9717 dissipate a significant amount of power. The maximum power dissipation for each package is given in the
Absolute Maximum Ratings
section under Continuous Power Dissipation or can be calculated by the following equation:
where T
J(MAX)
is +150°C, TAis the ambient temperature,
and θJAis the reciprocal of the derating factor in °C/W as specified in the
Absolute Maximum Ratings
section. For
example, θJAof the TDFN package is 41°C/W.
The increase in power delivered by the BTL configuration directly results in an increase in internal power dissipation over the single-ended configuration. The maximum power dissipation for a given VCCand load is given by the following equation:
If the power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by increasing the ground plane heat­sinking capability and the size of the traces to the device (see the
Layout and Grounding
section). Other methods for reducing power dissipation are to reduce VCC, increase load impedance, decrease ambient tempera­ture, reduce gain, or reduce input signal.
Thermal-overload protection limits total power dissipation in the MAX9716/MAX9717. Thermal protection circuitry disables the amplifier output stage when the junction temperature exceeds +160°C. The amplifiers are enabled once the junction temperature cools by 15°C. A pulsing output under continuous thermal-overload condi­tions results as the device heats and cools.
Fixed Gain
The MAX9717B, MAX9717C, and MAX9717D feature internally fixed gains of 6dB, 9dB, and 12dB, respec­tively (see the
Selector Guide
). Fixed gain simplifies designs, reduces pin count, decreases required foot­print size, and eliminates external gain-setting resistors. Resistors RINand RFshown in the MAX9717B/C/D
Typical Operating Circuit
are used to achieve each
fixed gain.
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
10 ______________________________________________________________________________________
Figure 1. Bridge-Tied Load Configuration
+1
-1
V
OUT(P-P)
2 x V
V
OUT(P-P)
OUT(P-P)
A
2
V
V
=
=
OUT P P
22
V
RMS
R
V
RMS
P
OUT
R
F
R
IN
()
2
L
P
DISSPKG MAX
()
=
TT
J MAX A
()
θ
JA
V
2
P
DISS MAX
()
=
CC
2
R
π
L
2
Adjustable Gain
Gain-Setting Resistors
External feedback resistors set the gain of the MAX9716 and MAX9717A. Resistors RFand RIN(see Figure 2)set the gain of the amplifier as follows:
Where AVis the desired voltage gain. Hence, an RINof 20kand an RFof 20kyields a gain of 2V/V, or 6dB. R
F
can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control.
The gain of the MAX9717 in a single-ended output configuration is half the gain when configured as BTL output. Choose R
F
between 10kand 50kfor the MAX9716 and MAX9717A. Gains for the MAX9717B/C/D are set internally.
Input Filter
CINand RINform a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capaci­tor allows the amplifier to bias the signal to an optimal DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is:
Setting f
-3dB
too high affects the low-frequency response of the amplifier. Use capacitors with dielectrics that have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with high­voltage coefficients, such as ceramics, can increase distortion at low frequencies.
Output-Coupling Capacitor
The MAX9717 require output-coupling capacitors to operate in single-ended (headphone) mode. The out­put-coupling capacitor blocks the DC component of the amplifier output, preventing DC current from flowing to the load. The output capacitor and the load impedance form a highpass filter with a -3dB point determined by:
As with the input capacitor, choose C
OUT
such that
f
-3dB
is well below the lowest frequency of interest.
Setting f
-3dB
too high affects the amplifier’s low-fre­quency response. Load impedance is a concern when choosing C
OUT
. Load impedance can vary, changing the -3dB point of the output filter. A lower impedance increases the corner frequency, degrading low-fre­quency response. Select C
OUT
such that the worst-
case load/C
OUT
combination yields an adequate response. Select capacitors with low ESR to minimize resistive losses and optimize power transfer to the load.
Differential Input
The MAX9716 can be configured for a differential input. The advantage of differential inputs is that any com­mon-mode noise is attenuated and not passed through the amplifier. This input improves noise rejection and provides common-mode rejection (Figure 3). External components should be closely matched for high CMRR. Figure 4 shows the MAX9716 configured for a differential input.
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________ 11
Figure 2. Setting the MAX9716/MAX9717A Gain
Figure 3. CMRR with Differential Input
BIAS
IN+
MAX9716
C
IN
R
AUDIO
INPUT
IN
IN-
R
F
OUT-
OUT+
R
A
=
V
F
2
R
IN
2
π
RC
1
IN IN
f
dB
−=3
2
π
RC
1
L OUT
f
dB
−=3
COMMON-MODE REJECTION RATIO
0
-10
-20
-30
-40
-50
CMRR (dB)
-60
-70
-80
-90
-100 10 100k
vs. FREQUENCY
V
RIPPLE
RL = 8 C
BIAS
FREQUENCY (Hz)
= 200mV
= 1µF
10k1k100
P-P
MAX9716/MAX9717
BIAS Capacitor
BIAS is the output of the internally-generated VCC/2 bias voltage. The BIAS bypass capacitor, C
BIAS
, improves the power-supply rejection ratio by reducing power supply and other noise sources at the common-mode bias node. C
BIAS
also generates the clickless/popless startup DC bias waveform for the speaker amplifiers. Bypass BIAS with a 1µF capacitor to GND. Larger C
BIAS
values improve PSRR but slow down tONtime. Do not connect external loads to BIAS.
Supply Bypassing
Proper power-supply bypassing ensures low-noise, low-distortion performance. Connect a 1µF ceramic capacitor from VCCto GND. Add additional bulk capacitance as required by the application. Connect the bypass capacitor as close to the device as possible.
Layout and Grounding
Proper PC board layout and grounding is essential for optimizing performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance. Large traces also aid in moving heat away from the package. Proper grounding improves audio performance and prevents digital switching noise from coupling into the audio signal.
The MAX9716/MAX9717 TDFN and µMAX packages feature exposed thermal pads on their undersides. This pad lowers the thermal resistance of the package by providing a direct-heat conduction path from the die to the printed circuit board. Connect the exposed pad to the ground plane using multiple vias, if required.
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
12 ______________________________________________________________________________________
Figure 4. MAX9716 Differential Input
R
F
20k
V
CC
220pF
C
BIAS
C
IN
R
0.33µF
AUDIO
INPUT
0.33µF
AUDIO
INPUT
VALUES SHOWN FOR 0dB GAIN.
IN
20k
C
IN
R
IN
20k
BIAS
IN+
IN-
V
CC
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
20k
20k
MAX9716
R
F
20k
220pF
SHDN
OUT-
OUT+
GND
ON
OFF
UCSP Applications Information
For the latest application details on UCSP construction, dimensions, tape carrier information, printed circuit board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to the application note, “UCSP—A Wafer-Level Chip-Scale Package” available on Maxim’s web site at http://www.maxim-ic.com/ucsp.
UCSP Marking Information
Pin A1 Bump Indicator
AAA: Product ID code
XXX: Lot Code
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________ 13
Selector Guide
Ordering Information (continued)
Chip Information
PROCESS: BiCMOS
*
EP = Exposed pad.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
G45 indicates protective die coating.
AAA XXX
PART TEMP RANGE
MAX9717AEBL+TG45 -40°C to +85°C 3 x 3 UCSP Adj.
MAX9717AETA+T -40°C to +85°C 8 TDFN-EP* Adj.
MAX9717AEUA -40°C to +85°C 8 µMAX-EP* Adj.
MAX9717BEBL+TG45 -40°C to +85°C 3 x 3 UCSP 6
MAX9717BETA+T -40°C to +85°C 8 TDFN-EP* 6
MAX9717BEUA -40°C to +85°C 8 µMAX-EP* 6
MAX9717CEBL+TG45 -40°C to +85°C 3 x 3 UCSP 9
MAX9717CETA+T -40°C to +85°C 8 TDFN-EP* 9
MAX9717CEUA -40°C to +85°C 8 µMAX-EP* 9
MAX9717DEBL+TG45 -40°C to +85°C 3 x 3 UCSP 12
MAX9717DETA+T -40°C to +85°C 8 TDFN-EP* 12
MAX9717DEUA -40°C to +85°C 8 µMAX-EP* 12
PIN­PACKAGE
GAIN
(dB)
PART BTL/SE INPUT GAIN (dB)
MAX9716 Adjustable MAX9717A Adjustable MAX9717B 6 MAX9717C 9 MAX9717D 12
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
14 ______________________________________________________________________________________
Pin/Bump Configurations
TOP VIEW
1
SHDN
2
MAX9716
3
IN+
4
µMAX
MAX9716
TOP VIEW
(BUMPS ON BOTTOM)
123
IN- OUT+ IN+
A
B
GND V
GND
BIAS SHDNOUT-
C
UCSP
(1.5mm x 1.5mm)
1
SHDN
87OUT-
6
5
CC
8
GNDBIAS
V
CC
OUT+IN-
OUT-
SHDN
BTL/SE
SHDN
1
2
MAX9717
3
4
µMAX
MAX9717
123
IN- OUT+ BTL/SE
A
B
GND V
GND
BIAS SHDNOUT-
C
UCSP
(1.5mm x 1.5mm)
1
87OUT-
6
5
CC
GNDBIAS
V
CC
OUT+IN-
8
OUT-
2
BIAS
MAX9716
3
IN+
4
IN-
TDFN
(3mm x 3mm x 0.8mm)
7
GND
6
V
CC
5
OUT+
BIAS
BTL/SE
2
MAX9717
3
4
IN-
7
GND
6
V
CC
5
OUT+
TDFN
(3mm x 3mm x 0.8mm)
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________ 15
Functional Diagrams/Typical Operating Circuits
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
BIAS
IN-
OUT+
OUT-
SHDN
GND
MAX9717A
R
F
40k
V
CC
R
IN
20k
C
IN
0.33µF
AUDIO
INPUT
C
BIAS
1µF
20k
20k
V
CC
VALUES SHOWN FOR BTL 12dB GAIN, HEADPHONE 6dB GAIN.
1µF
BTL/SE
C
OUT
100µF
100k
V
CC
1k
OFF
ON
100k
C
BIAS
1µF
C
IN
R
IN
0.33µF
AUDIO
INPUT
VALUES SHOWN FOR 12dB GAIN.
20k
V
CC
1µF
BIAS
IN+
IN-
V
CC
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
20k
20k
MAX9716
R
F
40k
SHDN
OUT-
OUT+
GND
ON
OFF
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
16 ______________________________________________________________________________________
Functional Diagrams/Typical Operating Circuits (continued)
V
CC
1µF
BIAS
C
BIAS
1µF
IN+
C
AUDIO
INPUT
IN
0.33µF
R
IN
20k
IN-
V
CC
R
MAX9717B MAX9717C MAX9717D
CLICKLESS/POPLESS
20k
F
SHUTDOWN
CONTROL
20k
BTL/SE
SHDN
OUT-
OUT+
GND
100k
OFF
ON
C
OUT
100µF
100k
1k
V
CC
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________ 17
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE OUTLINE NO.
8 µMAX U8E+2 21-0107 90-0145
8 TDFN-EP T833+1 21-0137 90-0059
9 UCSP B9+1 21-0093
LAND
PATTERN NO.
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
18 ______________________________________________________________________________________
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________ 19
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.
COM MO N DIMENSIONS
SYM BOL
MIN . M AX.
A0.70 0.80
D2.90 3.10
E2.90 3.10
A1
0.00 0.05
L0.20 0.40
0.25 MIN.k
A2 0.20 REF.
PACKAG E VARIATIONS
PKG. CO DE
T633-2
T833-2
T833-3
T1033-1
T1033M K -1
T1033-2
T1433-1
N D2 E2 e
61.50±0.10 2.30±0.10 0.95 B S C M O 229 / W EEA 0.40±0.05 1.90 REF
81.50±0.10 2.30±0.10
81.50±0.10 2.30±0.10
1.50± 0.10
1.70± 0.10 2.30±0.1014
JEDEC SPEC
0.65 B S C M O 229 / W EEC
0.65 B S C M O 229 / W EEC
2.30± 0.1010
2.30± 0.101.50±0.10
2.30± 0.10 M O 229 / W EED-32.00 REF0.25±0.050.50 BSC1.50± 0.1010
0.50 BSC
0.50 B S C M O 229 / W EED -3
0.40 BSC
0.40 BSC
0.40 BSC
M O 229 / W EED -3
- - - -
- - - - 0.20±0.05 2.40 REFT1433-3F 14 2.30± 0.101.70±0.10
b
[(N/2)-1] x e
0.30± 0.05 1.95 REF
0.30± 0.05 1.95 REF
2.00 REF0.25± 0.05
0.25± 0.05 2.00 REF10
2.40 REF0.20± 0.05- - - -
0.20± 0.05 2.40 REFT1433-214 2.30±0.101.70±0.10
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio Power Amplifiers
20 ______________________________________________________________________________________
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
21
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
2 3/09 Added lead-free and G45 options to Ordering Information 1, 13
3 3/12 Add automotive qualified part 1
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
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