MAXIM MAX9789, MAX9790 Technical data
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0606; Rev 3; 9/09
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.
General Description
The MAX9789/MAX9790 combine a stereo, 2W Class AB
speaker power amplifier with a stereo 100mW
DirectDrive
®
headphone amplifier in a single device. The
MAX9789/MAX9790 are designed for use with the
Microsoft Windows Vista
®
operating system and are fully
compliant with Microsoft’s Windows Vista specifications.
The headphone amplifier features Maxim’s DirectDrive
architecture that produces a ground-referenced output
from a single supply to eliminate the need for large DCblocking capacitors, as well as save cost, board space,
and component height. A high +90dB PSRR and low
0.002% THD+N ensures clean, low-distortion amplification of the audio signal.
Separate speaker and headphone amplifier control
inputs provide independent shutdown of the speaker
and headphone amplifiers, allowing speaker and headphone amplifiers to be active simultaneously, if
required. The industry-leading click-and-pop suppression circuitry reduces audible transients during startup
and shutdown cycles.
The MAX9789 features an internal LDO that can be used
as a clean power supply for a CODEC or other circuits.
The LDO output voltage is set internally at 4.75V or can
be adjusted between 1.21V and 4.75V using a simple
resistive divider. The LDO is protected against thermal
overloads and short circuits while providing 120mA of
continuous output current and can be enabled independently of the audio amplifiers.
By disabling the speaker and headphone amplifiers, and
the LDO (for MAX9789), the MAX9789/MAX9790 enter
low-power shutdown mode and draw only 0.3µA.
The MAX9789/MAX9790 operate from a single 4.5V to
5.5V supply and feature thermal-overload and output
short-circuit protection. Devices are specified over the
-40°C to +85°C extended temperature range.
Features
Applications
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
**
Future product—contact factory for availability.
PART
PIN-PACKAGE
INTERNAL LDO
tON (ms)
MAX9789AETJ+
Yes 100
MAX9789BETJ+**
Yes 25
MAX9789CETJ+
Yes 100
MAX9790AETJ+
No 100
MAX9790BETJ+**
No 25
Simplified Block Diagrams
MAX9789
SPKR_EN
HP_EN
MUTE
GAIN1
GAIN2
SPEAKER SUPPLY
4.5V TO 5.5V
HEADPHONE SUPPLY
3.0V TO 5.5V
LDO
4.5V TO 5.5V
SPKR_INR
SPKR_INL
HP_INR
HP_INL
1.21V TO 4.75V
♦ Microsoft Windows Vista Compliant
♦ Class AB 2W Stereo BTL Speaker Amplifier
♦ 100mW DirectDrive Headphone Amplifier
Eliminates Costly, Bulky DC-Blocking Capacitors
♦ Excellent RF Immunity
♦ Integrated 120mA LDO (MAX9789)
♦ High +90dB PSRR, Low 0.002% THD+N
♦ Low-Power Shutdown Mode
♦ Click-and-Pop Suppression
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in 32-Pin Thin QFN (5mm x 5mm x
0.8mm) Package
Notebook Computers
Tablet PCs
Portable Multimedia Players
Windows Vista is a registered trademark of Microsoft Corp.
Pin Configurations appear at end of data sheet.
Simplified Block Diagrams continued at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
32 TQFN-EP*
32 TQFN-EP*
32 TQFN-EP*
32 TQFN-EP*
32 TQFN-EP*
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= CPVDD= HPVDD= HP_EN = V
LDO_EN
(MAX9789 only) = +5V, V
GND
= V
PGND
= V
CPGND
= SPKR_EN = V
LDO_SET
(MAX9789 only) = 0V, I
LDO_OUT
(MAX9789 only) = 0, C1 = C2 = C
BIAS
= 1µF. RL= ∞, unless otherwise specified, V
GAIN1
= 0,
V
GAIN2
= 5V (A
VSP
= 10dB, A
VHP
= 3.5dB), TA= T
MIN
to T
MAX
, unless otherwise noted. 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 (VDD, PVDD, HPVDD,
CPV
DD
to GND)..................................................-0.3V to +6.0V
GND to PGND, CPGND ......................................................±0.3V
CPV
SS
, C1N, VSSto GND......................................-6.0V to +0.3V
HPR, HPL to GND ...............................................................±3.0V
Any Other Pin .............................................-0.3V to (V
DD
+ 0.3V)
Duration of OUT_+, OUT_- Short Circuit
to GND or PV
DD
......................................................Continuous
Duration of Short Circuit between OUT_+, OUT_-
and LDO_OUT.........................................................Continuous
Duration of Short Circuit between HPR, HPL and GND,
V
SS
or HPVDD..........................................................Continuous
Continuous Current (PV
DD
, OUT_+, OUT_-, PGND).............1.7A
Continuous Current (CPV
DD
, C1N, C1P, CPVSS, PVSS,
V
DD,
HPVDD, LDO_OUT, HPR, HPL) .............................850mA
Continuous Input Current (all other pins) .........................±20mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN Single-Layer Board
(derate 18.6mW/°C above +70°C)..............................1489mW
θ
JA
...........................................................................53.7°C/W
θ
JC
...........................................................................19.9°C/W
32-Pin Thin QFN Multilayer Board
(derate 24.9 mW/°C above +70°C).............................1990mW
θ
JA
...........................................................................40.2°C/W
θ
JC
...........................................................................19.9°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage VDD, PV
Headphone Supply Voltage
Quiescent Current I
Shutdown Current I
Bias Voltage V
Shutdown to Full Operation t
Gain Switching Time t
CPV
HPV
SHDN
DD
DD
DD
DD
BIAS
SON
SW
Channel-to-Channel Gain
Tracking
SPEAKER AMPLIFIER
Output Power P
Total Harmonic Distortion Plus
Noise
OUT
THD+N
,
Guaranteed by PSRR and LDO Line
Regulation Tests
Guaranteed by PSRR Test 3.0 5.5 V
SPKR_EN HP_EN
1 (MAX9789) 0 (MAX9789) 0.1 0.4 mA
1 (MAX9790) 0 (MAX9790) 0.3 6 µA
11 713
0 0 14 29
0 1 18 40
SPKR_EN = VDD, HP_EN = LDO_EN = GND 0.3 6 µA
MAX9789A/MAX9789C/MAX9790A 100
MAX9789B/MAX9790B 25
THD+N = 1%, f = 1kHz,
T
= +25°C
A
RL = 8Ω, P
R
= 4Ω, P
L
4.5 5.5 V
1.7 1.8 1.9 V
10 µs
±0.1 dB
RL = 4Ω 2
R
= 8Ω 1
L
= 1W, f = 1kHz 0.002
OUT
= 1W, f = 1kHz 0.004
OUT
mA
ms
W
%
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= HPVDD= HP_EN = V
LDO_EN
(MAX9789 only) = +5V, V
GND
= V
PGND
= V
CPGND
= SPKR_EN = V
LDO_SET
(MAX9789 only) = 0V, I
LDO_OUT
(MAX9789 only) = 0, C1 = C2 = C
BIAS
= 1µF. RL= ∞, unless otherwise specified, V
GAIN1
= 0,
V
GAIN2
= 5V (A
VSP
= 10dB, A
VHP
= 3.5dB), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Rejection Ratio PSRR
Voltage Gain A
Input Impedance R
Output Offset Voltage V
V
IN
OS
VDD = 4.5V to 5.5V, TA = +25°C 72 90
f = 1kHz, 200mV
P-P
f = 10kHz, 200mV
GAIN1 GAIN2
00 6
01 10
1 0 15.6
1 1 21.6
Measured at speaker amplifier inputs
GAIN1 GAIN2
00 80
01 65
10 45
11 25
Measured between
OUT_+ and OUT_-,
T
= +25°C
A
(Note 4) 70
(Note 4) 50
P-P
MAX9789C ±1 ±25
±1 ±15
dB
dB
kΩ
mV
RL = 8Ω, peak voltage,
Click-and-Pop Level K
A-weighted, 32 samples
CP
per second (Notes 3, 4)
Signal-to-Noise Ratio SNR RL = 8Ω, P
Noise V
Capacitive-Load Drive C
BW = 22Hz to 22kHz 30 µV
n
No sustained oscillations 200 pF
L
L to R, R to L, R
= 70.7nV
Crosstalk
V
OUT
= 1W
OUT
= 8Ω, FS = 0.707V
L
RMS,
Into shutdown -50
Out of shutdown -50
A-weighted 102
f = 22Hz to 22kHz 99
,
RMS
20kHz AES17,
dBV
dB
RMS
-70 dB
BW = 20Hz to 20kHz
Slew Rate SR 1.4 V/µs
HEADPHONE AMPLIFIER
Output Power P
OUT
THD+N = 1%, f =
1kHz, T
= +25°C
A
RL = 32Ω, FS = 0.300V
= 210mV
V
OUT
RMS
RL = 16Ω 100
R
= 32Ω 55
L
,
RMS
, 20kHz AES17,
mW
-77 dB FS
BW = 20Hz to 20kHz
Total Harmonic Distortion Plus
Noise
THD+N
RL = 32Ω, P
RL = 16Ω, P
= 10kΩ, FS = 0.707V
R
L
V
= 500mV
OUT
= 40mW, f = 1kHz 0.02
OUT
= 60mW, f = 1kHz 0.03
OUT
,
RMS
, 20kHz AES17,
RMS
%
-94 dB FS
BW = 20Hz to 20kHz
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= HPVDD= HP_EN = V
LDO_EN
(MAX9789 only) = +5V, V
GND
= V
PGND
= V
CPGND
= SPKR_EN = V
LDO_SET
(MAX9789 only) = 0V, I
LDO_OUT
(MAX9789 only) = 0, C1 = C2 = C
BIAS
= 1µF. RL= ∞, unless otherwise specified, V
GAIN1
= 0,
V
GAIN2
= 5V (A
VSP
= 10dB, A
VHP
= 3.5dB), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Rejection Ratio PSRR
Voltage Gain A
Input Impedance R
Output Offset Voltage V
Click-and-Pop Level K
Dynamic Range DR
V
IN
OS
CP
Signal-to-Noise Ratio SNR
Noise V
Capacitive-Load Drive C
n
L
Crosstalk
Slew Rate SR 0.4 V/µs
Charge-Pump Frequency f
OSC
LOW-DROPOUT LINEAR REGULATOR
Regulator Input Voltage Range V
Ground Current I
Output Current I
DD
GND
OUT
Crosstalk
Fixed Output Voltage Accuracy I
Adjustable Output Voltage Range 1.21 4.75 V
LDO_SET Reference Voltage V
SET
LDO_SET Dual-Mode Threshold 200 mV
HPVDD = 3V to 5.5V, TA = +25°C 70 95
f = 1kHz, V
f = 10kHz, V
RIPPLE
RIPPLE
= 200mV
= 200mV
(Note 4) 84
P-P
(Note 4) 63
P-P
3.5 dB
Measured at headphone amplifier inputs 20 40 80 kΩ
TA = +25°C
RL = 32Ω, peak voltage,
MAX9789C ±2 ±10
Into shutdown -60
±2 ±7
A-weighted, 32 samples
per second (Notes 3, 4)
RL = 32Ω, f = 1kHz, A-weighted,
FS = 0.300V
R
= 10kΩ, f = 1kHz, A-weighted,
L
FS = 0.707V
R
= 32Ω,
L
= 60mW
P
OUT
RMS
RMS
, V
, V
Out of shutdown -60
= 300µV
OUT
OUT
= 707µV
RMS
RMS
22Hz to 22kHz 100
A-weighted 103
89
97
BW = 22Hz to 22kHz 12 µV
No sustained oscillations 200 pF
RL = 32Ω,
L to R, R to L,
20kHz AES17
BW = 20Hz to 20kHz
FS = 0.300V
= 30mV
V
OUT
= 10kΩ,
R
L
FS = 0.707V
= 70.7mV
V
OUT
RMS
RMS
RMS
,
,
RMS
-74
-77
500 550 625
MAX9789C 475 550 625
Inferred from line regulation 4.5 5.5 V
I
= 0mA 0.1 0.4
OUT
I
= 120mA -40
OUT
120 mA
V
= 4.75V, I
OUT
speaker P
= 1mA
OUT
OUT
= 0mA, f = 1kHz,
OUT
= 2W, speaker RL = 4Ω
MAX9789C ±3.0
-95 dB
±1.5
1.18 1.21 1.23
MAX9789C 1.18 1.21 1.25
dB
mV
dBV
dB FS
dB
RMS
dB
kHz
mA
%
V
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 5
Note 2: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 3: Specified at room temperature with an 8Ω resistive load connected across BTL output for speaker amplifier. Specified at
room temperature with a 32Ω resistive load connected between HPR, HPL, and GND for headphone amplifier. Speaker and
headphone mode transitions are controlled by SPKR_EN and HP_EN control pins, respectively.
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: Maximum value is due to test limitations.
Note 6: V
LDO_OUT
= V
LDO_OUTNOMINAL
- 2%.
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= HPVDD= HP_EN = V
LDO_EN
(MAX9789 only) = +5V, V
GND
= V
PGND
= V
CPGND
= SPKR_EN = V
LDO_SET
(MAX9789 only) = 0V, I
LDO_OUT
(MAX9789 only) = 0, C1 = C2 = C
BIAS
= 1µF. RL= ∞, unless otherwise specified, V
GAIN1
= 0,
V
GAIN2
= 5V (A
VSP
= 10dB, A
VHP
= 3.5dB), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LDO_SET Input Bias Current
(Note 5)
Dropout Voltage (Note 6) V
Current Limit I
I
SET
LIM
DO
Startup Time 20 µs
Line Regulation
Load Regulation
Ripple Rejection
Output Voltage Noise
DIGITAL INPUTS (SPKR_EN, HP_EN, MUTE, GAIN1, GAIN2, LDO_EN (MAX9789 Only))
Input-Voltage High V
Input-Voltage Low V
INH
INL
Input Bias Current ±1 µA
V
= 4.75V (fixed
OUT
I
output operation),
T
= +25°C
A
V
= 4.5V to 5.5V, LDO_OUT = 2.5V,
IN
I
LDO_OUT
V
LDO_OUT
1mA < I
V
RIPPLE
I
LDO_OUT
20Hz to 22kHz, C
I
LDO_OUT
= 1mA
= 4.75V,
LDO_OUT
= 200mV
= 10mA
= 120mA
< 120mA
P-P
LDO_OUT
I
f = 1kHz 59
f = 10kHz 42
= 2 x 1µF,
±20 ±500 nA
= 50mA 25 50
OUT
= 120mA 75 150
OUT
300 mA
-4.8 +0.8 +4.8 mV/V
0.2 mV/mA
125 µV
2V
0.8 V
mV
dB
RMS
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= PVDD= CPVDD= HPVDD= LDO_EN = +5V, V
GND
= V
PGND
= V
CPGND
= V
LDO_SET
= 0V, C1 = C2 = C
BIAS
= CIN= 1µF. RL=
∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (A
VSP
= 10dB, A
VHP
= 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,
unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9789 toc01
FREQUENCY (Hz)
THD+N (dB FS)
10k1k100
-100
-90
-80
-70
-60
-110
10 100k
FS = 0.707V
RMS
V
OUT
= -3dB FS
R
L
= 10k
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9789 toc02
FREQUENCY (Hz)
THD+N (dB FS)
10k1k100
-90
-80
-70
-60
-100
10 100k
HPVDD = 3V
FS = 0.707V
RMS
V
OUT
= -3dB FS
R
L
= 10k
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE (HEADPHONE MODE)
MAX9789 toc03
OUTPUT VOLTAGE (V
RMS
)
THD+N (%)
1.51.00.5
0.01
0.1
1
10
0.001
0 2.0
RL = 10k
Ω
fIN = 20Hz
fIN = 10kHz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE (HEADPHONE MODE)
MAX9789 toc04
OUTPUT VOLTAGE (V
RMS
)
THD+N (%)
1.51.00.5
0.01
0.1
1
10
0.001
0 2.0
HPVDD = 3V
R
L
= 10k
Ω
fIN = 20Hz
fIN = 1kHz
fIN = 10kHz
CROSSTALK
vs. FREQUENCY (HEADPHONE MODE)
MAX9789 toc05
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-80
-90
-60
-40
-20
-70
-50
-30
-10
0
-100
10 100k
FS = 0.707V
RMS
V
OUT
= -20dB FS
R
L
= 10k
Ω
LEFT TO RIGHT
RIGHT TO LEFT
HEADPHONE OUTPUT SPECTRUM
MAX9789 toc06
FREQUENCY (Hz)
CROSSTALK (dB)
15k10k5k
-80
-90
-60
-40
-20
-70
-50
-30
-10
0
-140
-100
-110
-120
-130
0 20k
FS = 0.300V
RMS
V
OUT
= -60dB FS
R
L
= 10k
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9789 toc07
FREQUENCY (Hz)
THD+N (dB FS)
1k100
-90
-95
-85
-80
-75
-100
10 100k10k
V
OUT
= -3dB FS
FS = 0.707V
RMS
RL = 3Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9789 toc08
FREQUENCY (Hz)
THD+N (dB FS)
1k100
-90
-95
-85
-80
-75
-100
10 100k10k
V
OUT
= -3dB FS
FS = 0.707V
RMS
RL = 4Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9789 toc09
FREQUENCY (Hz)
THD+N (dB FS)
1k100
-90
-100
-95
-105
-85
-80
-75
-110
10 100k10k
V
OUT
= -3dB FS
FS = 0.707V
RMS
RL = 8Ω
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= HPVDD= LDO_EN = +5V, V
GND
= V
PGND
= V
CPGND
= V
LDO_SET
= 0V, C1 = C2 = C
BIAS
= CIN= 1µF. RL=
∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (A
VSP
= 10dB, A
VHP
= 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,
unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9789 toc10
OUTPUT POWER (W)
THD+N (%)
1.51.00.5
0.01
0.1
1
10
0.001
0 3.02.0 2.5
RL = 3
Ω
fIN = 10kHz
fIN = 20Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9789 toc11
OUTPUT POWER (W)
THD+N (%)
1.51.00.5
0.01
0.1
1
10
0.001
0 2.52.0
RL = 4
Ω
fIN = 10kHz
fIN = 20Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9789 toc12
OUTPUT POWER (W)
THD+N (%)
1.00.5
0.01
0.1
1
10
0.001
01.5
RL = 8
Ω
fIN = 10kHz
fIN = 20Hz
fIN = 1kHz
CROSSTALK
vs. FREQUENCY (SPEAKER MODE)
MAX9789 toc13
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-80
-60
-40
-20
0
-100
-70
-50
-30
-10
-90
10 100k
FS = 0.707V
RMS
V
OUT
= -20dB FS
R
L
= 8
Ω
LEFT TO RIGHT
RIGHT TO LEFT
SPEAKER OUTPUT SPECTRUM
FREQUENCY (Hz)
CROSSTALK (dB)
MAX9789 toc14
0 5k 10k 15k 20k
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
FS = 0.707V
RMS
V
OUT
= -60dB FS
R
L
= 8Ω
OUTPUT POWER vs. LOAD RESISTANCE
(SPEAKER MODE)
RL (Ω)
OUTPUT POWER (W)
MAX9789 toc15
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
1 10 100
fIN = 1kHz
THD+N = 1%
THD+N = 10%
POWER DISSIPATION PER CHANNEL
vs. OUTPUT POWER (SPEAKER MODE)
OUTPUT POWER PER CHANNEL (W)
POWER DISSIPATION PER CHANNEL (W)
MAX9789 toc16
0 0.5 1.0 1.5 2.0
0
0.25
0.50
0.75
1.00
1.25
1.50
RL = 8Ω
RL = 4Ω
fIN = 1kHz
POWER-SUPPLY REJECTION RATIO
(SPEAKER MODE)
FREQUENCY (Hz)
PSRR (dB)
MAX9789 toc17
10 100 1k 10k 100k
100
-90
-70
-80
-40
-50
-60
-30
-20
-10
0
V
RIPPLE
= 200mV
P-P
OUTPUT REFERRED
SPEAKER SHUTDOWN WAVEFORM
MAX9789 toc20
20ms/div
2V/div
5V/div
100mV/div
OUT_+ AND OUT_-
OUT_+ - OUT_-
SPKR_EN
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= HPVDD= LDO_EN = +5V, V
GND
= V
PGND
= V
CPGND
= V
LDO_SET
= 0V, C1 = C2 = C
BIAS
= CIN= 1µF. RL=
∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (A
VSP
= 10dB, A
VHP
= 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,
unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
SPEAKER STARTUP WAVEFORM
MAX9789A/MAX9789C/MAX9790A
MAX9789 toc18
SPKR_EN
5V/div
OUT_+ AND OUT_2V/div
SPEAKER STARTUP WAVEFORM
MAX9789B/MAX9790B
MAX9789 toc19
SPKR_EN
5V/div
OUT_+ AND OUT_2V/div
20ms/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
-65
-70
-75
V
= -3dB FS
-80
-85
-90
THD+N (dB FS)
-95
-100
-105
-110
OUT
HPVDD = 3V
FS = 0.300V
RL = 32Ω
10 100k
RMS
FREQUENCY (Hz)
10k1k100
MAX9789 toc22
OUT_+ - OUT_100mV/div
TOTAL HARMONIC DISTORTION PLUS NOISE
-65
-70
-75
-80
-85
-90
THD+N (dB FS)
-95
-100
-105
-110
10 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
-65
-70
-75
V
= -3dB FS
OUT
-80
-85
-90
THD+N (dB FS)
-95
-100
FS = 0.300V
-105
-110
10 100k
RL = 16Ω
RMS
10k1k100
FREQUENCY (Hz)
20ms/div
vs. FREQUENCY (HEADPHONE MODE)
V
= -3dB FS
OUT
FS = 0.300V
RMS
Ω
RL = 32
10k1k100
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
-65
-70
MAX9789 toc23
-75
V
= -3dB FS
OUT
-80
-85
-90
THD+N (dB FS)
-95
-100
HPVDD = 3V
FS = 0.300V
-105
-110
10 100k
RL = 16Ω
RMS
OUT_+ - OUT_100mV/div
MAX9789 toc21
FREQUENCY (Hz)
MAX9789 toc24
10k1k100
MAX9789/MAX9790
HEADPHONE OUTPUT SPECTRUM
MAX9789 toc30
FREQUENCY (kHz)
AMPLITUDE (dB)
15105
-80
-60
-40
-20
0
-140
-70
-50
-30
-10
-100
-120
-90
-110
-130
020
FS = 0.707V
RMS
V
OUT
= -60dB FS
R
L
= 32
Ω
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
RL (Ω)
OUTPUT POWER (mW)
MAX9789 toc31
0
50
100
150
10 100 1000
THD+N = 1%
THD+N = 10%
fIN = 1kHz
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
RL (Ω)
OUTPUT POWER (mW)
MAX9789 toc32
0
50
100
10 100 1000
HPVDD = 3V
f
IN
= 1kHz
THD+N = 1%
THD+N = 10%
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= HPVDD= LDO_EN = +5V, V
GND
= V
PGND
= V
CPGND
= V
LDO_SET
= 0V, C1 = C2 = C
BIAS
= CIN= 1µF. RL=
∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (A
VSP
= 10dB, A
VHP
= 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,
unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9789 toc26
OUTPUT POWER (mW)
THD+N (%)
604020
0.1
10
0.01
1
010080
RL = 32
Ω
f = 1kHz
f = 10kHz
f = 20Hz
CROSSTALK
vs. FREQUENCY (HEADPHONE MODE)
MAX9789 toc29
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-80
-60
-40
-20
0
-110
-70
-50
-30
-10
-90
-100
10 100k
FS = 0.300V
RMS
V
OUT
= -20dB FS
R
L
= 32
Ω
LEFT TO RIGHT
RIGHT TO LEFT
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
9
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
10
MAX9789 toc25
1
THD+N (%)
0.1
0.01
f = 20Hz
f = 1kHz
0200
OUTPUT POWER (mW)
f = 10kHz
15010050
RL = 16
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
10
MAX9789 toc28
1
THD+N (%)
0.1
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
10
1
f = 20Hz
THD+N (%)
0.1
0.01
0150
OUTPUT POWER (mW)
f = 10kHz
f = 1kHz
HPVDD = 3V
Ω
= 16
R
L
10050
MAX9789 toc27
HPVDD = 3V
Ω
= 32
R
0.01
010080
OUTPUT POWER (mW)
604020
L
Loading...