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PDF MAX9757 Data sheet ( Hoja de datos )
| Número de pieza | MAX9757 | |
| Descripción | 2.3W Stereo Speaker Amplifiers and DirectDrive Headphone Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9757 (archivo pdf) en la parte inferior de esta página. Total 31 Páginas | ||
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19-3782; Rev 0; 8/05
EVAALVUAAILTAIOBNLEKIT
2.3W Stereo Speaker Amplifiers and DirectDrivewww.DataSheet4U.com
Headphone Amplifiers with Automatic Level Control
General Description
The MAX9756/MAX9757/MAX9758 combine dual, 2.3W,
bridge tied load (BTL) stereo audio power amplifiers and
a DirectDriveTM headphone amplifier in a single device.
These devices feature single-supply voltage operation,
shutdown mode, logic-selectable gain, a headphone
sense input, a 31-step analog volume control, and indus-
try-leading click-and-pop suppression. The headphone
amplifier uses Maxim’s patent-pending DirectDrive archi-
tecture that produces a ground-referenced output from a
single supply, eliminating the need for large DC-blocking
capacitors.
The MAX9756/MAX9757 feature automatic level control
(ALC) that automatically limits output power to the speak-
er in the event of an overpowered output.
The MAX9756/MAX9758s’ 150mA internal linear regula-
tor provides a complete solution for DAC- or CODEC-
based designs.
The MAX9756/MAX9757/MAX9758 are offered in space-
saving, thermally efficient 32-pin (5mm x 5mm x 0.8mm)
and 36-pin thin QFN (6mm x 6mm x 0.8mm) packages.
All devices are specified over the extended -40°C to
+85°C temperature range.
Applications
Notebook PCs
Tablet PCs
Portable DVD
Players
Flat-Panel TVs
PC Displays
LCD Projectors
Portable Audio
Features
♦ Automatic Level Control—Protects Speakers
♦ Analog Volume Control
♦ 120mW DirectDrive Headphone Amplifiers (16Ω)
♦ 150mA Adjustable LDO
♦ Class AB, 2.3W, Stereo BTL Speaker Amplifiers
(3Ω)
♦ High 95dB PSRR
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Short-Circuit and Thermal Protection
♦ Beep Input
Ordering Information
PART
MAX9756ETX+
MAX9757ETJ+*
MAX9758ETJ+*
ALC
√
√
—
LDO
√
—
√
PIN-PACKAGE
36 Thin QFN-EP**
32 Thin QFN-EP**
32 Thin QFN-EP**
Note: All devices specified for -40°C to +85°C operating
temperature range.
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed paddle.
Simplified Block Diagrams
SINGLE SUPPLY 4.5V TO 5.5V
SINGLE SUPPLY 4.5V TO 5.5V
SINGLE SUPPLY 4.5V TO 5.5V
ALC ALC
ALC ALC
VOL
BEEP
HPS
LDO
1.2V TO 5V
VOL
BEEP
HPS
VOL
BEEP
HPS
LDO
1.2V TO 5V
MAX9756
MAX9757
MAX9758
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
2.3W Stereo Speaker Amplifiers and DirectDrivewww.DataSheet4U.com
Headphone Amplifiers with Automatic Level Control
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = HPVDD = CPVDD = IN = +5.0V, GND = PGND = CPGND = 0, SHDN = VDD, REGEN = VDD, DR = SET = GND, CBIAS
= 1µF, CPVSS = 1µF, C1 = C2 = 1µF, PREF = unconnected, speaker loads terminated between OUT_+ and OUT_-, headphone load
terminated between HP_ and GND, GAIN1 = GAIN2 = GAIN3 = VOL = 0 (AV(SP) = 15dB, AV(HP) = 0dB), TA = -40°C to +85°C, unless
otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
LOGIC INPUT HEADPHONE (HPS)
Input High Voltage
Input Low Voltage
VIH
VIL
HPS Pullup Current
LOW-DROPOUT LINEAR REGULATOR
Input Voltage Range
VIN
Supply (Ground) Current
IQ
Shutdown Current
Output Current
Fixed Output Voltage Accuracy
Adjustable Output Voltage Range
SET Reference Voltage
SET Dual-Mode Threshold
SET Input Leakage Current
Dropout Voltage (Note 10)
ISHDN
IOUT
VSET
ISET
ΔVOD
Output Current Limit
Startup Time
ILIM
Line Regulation
Load Regulation
Ripple Rejection
Output Voltage Noise
CONDITIONS
Inferred from line regulation
IOUT = 0mA, SHDN = GND
IOUT = 150mA
REGEN = 0V
IOUT = 1mA
VOUT = 4.65V (fixed IOUT = 50mA
output operation)
IOUT = 150mA
VIN = 3.5V to 5.5V, VOUT = 2.5V,
IOUT = 1mA
VOUT = 4.65V, 1mA < IOUT < 150mA
VRIPPLE = 200mVP-P
f = 1kHz
f = 10kHz
20Hz to 22kHz, COUT = 2 x 1µF,
IOUT = 150mA, VOUT = 4.65V
MIN TYP MAX UNITS
2V
0.8 V
35 µA
3.5
150
VSET
1.19
-0.1
100
350
0.1
1.21
200
±20
25
100
300
20
+0.01
0.5
60
50
100
5.5
160
3
±1.5
4.85
1.23
±500
50
150
+0.1
V
µA
µA
mA
%
V
V
mV
nA
mV
mA
µs
%/V
%
dB
µVRMS
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2: PSRR is specified with the amplifier input connected to GND through RIN and CIN.
Note 3: Output power levels are measured with the TQFN’s exposed paddle soldered to the ground plane.
Note 4: Speaker path gain is defined as: AVSPKR = (VOUT+ - VOUT-)/VIN__).
Note 5: Speaker mode testing performed with 8Ω resistive load connected across BTL output. Headphone mode testing per-
formed with 32Ω resistive load connected between HP_ and GND. Mode transitions are controlled by SHDN.
Note 6: Headphone path gain is defined as: AVHP = VHP_/VIN__.
Note 7: See Table 3 for detains on the mute levels.
Note 8: Attack envelope is exponential. Attack time is defined as the 15 x 103 x CT.
Note 9: Time for the gain to return to within 10% of nominal gain setting after the input signal has fallen below the PREF threshold.
Release is linear in dB. Release time is proportional to magnitude of gain compression.
Note 10: Dropout voltage is defined as (VIN - VOUT) when VOUT is 2% below the value of VOUT for VIN = VOUT(NOM) + 1V.
_______________________________________________________________________________________ 5
5 Page 
2.3W Stereo Speaker Amplifiers and DirectDrivewww.DataSheet4U.com
Headphone Amplifiers with Automatic Level Control
Typical Operating Characteristics (continued)
(VDD = PVDD = HPVDD = CPVDD = IN = +5.0V, GND = PGND = CPGND = 0V, SHDN = VDD, REGEN = DR = SET = GND, CBIAS =
1µF, CPVSS = 1µF, C1 = C2 = 1µF, PREF = unconnected, GAIN1 = 1, GAIN2 = GAIN3 = VOL = 0V, measurement BW = 22Hz to
22kHz, TA = +25°C, unless otherwise noted.)
OUTPUT NOISE
vs. FREQUENCY (LDO)
110
100
COUT = 2μF
10Hz TO 100kHz
90
80
70
60
50
40
30
20
10
10
100 1k 10k
FREQUENCY (Hz)
100k
LINE-TRANSIENT RESPONSE
MAX9756 toc42
5.5V
VIN
500mV/div
4.5V
LDO_OUT
20mV/div
40μs/div
LOAD-TRANSIENT RESPONSE
MAX9756 toc43
50V
ILOAD
25mV/div
0V
LDO SHUTDOWN RESPONSE
MAX9756 toc44
REGEN
5V/div
LDO_OUT = 4.65V
20mV/div
LDO_OUT
1V/div
20μs/div
100ms/div
Pin Description
PIN
MAX9756 MAX9757
1 32
21
32
43
54
6, 22
5, 21
76
87
9,19 8,18
MAX9758
32
1
2
3
4
5, 21
6
7
8, 18
NAME
FUNCTION
INL Left-Channel Audio Input
GAIN1 Gain Control Input 1
GAIN2 Gain Control Input 2
GAIN3 Gain Control Input 3
BEEP Audible Alert Beep Input
PGND Power Ground
OUTL+ Left-Channel Positive Speaker Output
OUTL- Left-Channel Negative Speaker Output
PVDD Speaker Amplifier Power Supply. Bypass with 1µF ceramic capacitor to PGND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 31 Páginas | |
| PDF Descargar | [ Datasheet MAX9757.PDF ] | |
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