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參數(shù)資料
| 型號： | MAX9759 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier |
| 中文描述： | 3.2W、高效、低EMI、無需濾波、D類音頻放大器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 957K |
| 代理商： | MAX9759 |
Detailed Description
Operating Modes
The MAX9759 filterless, Class D audio power amplifier
features several improvements to switch-mode amplifier
technology. The MAX9759 offers Class AB performance
with Class D efficiency, while occupying minimal board
space. A unique modulation scheme, synchronizable
switching frequency, and SSM mode create a compact,
flexible, low-noise, efficient audio power amplifier. The
differential input architecture reduces common-mode
noise pickup, and can be used without input-coupling
capacitors. The device can also be configured as a sin-
gle-ended input amplifier.
Comparators monitor the MAX9759 inputs and com-
pare the complementary input voltages to the sawtooth
waveform. The comparators trip when the input magni-
tude 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, gener-
ating 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.
Fixed-Frequency Modulation (FFM) Mode
The MAX9759 features two FFM modes. The FFM
modes are selected by setting SYNC = GND for a
1.1MHz switching frequency, and SYNC = FLOAT for a
1.5MHz switching frequency. In FFM mode, the fre-
quency 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 MAX9759 allows the
switching frequency to be changed, should the fre-
quency of one or more of the harmonics fall in a sensi-
tive band. This can be done at any time and does not
affect audio reproduction.
M
3.2W, High-Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
10
______________________________________________________________________________________
Pin Description
PIN
TQFN
1
2
3
4
TSSOP
7
8
9
10
NAME
FUNCTION
V
DD
IN+
IN-
GND
Analog Power Supply. Bypass to GND with a 1μF ceramic capacitor.
Noninverting Audio Input
Inverting Audio Input
Analog Ground
5
11
SHDN
Active-Low Shutdown Input. Drive
SHDN
low to shut down the MAX9759. Connect to
V
DD
for normal operation.
Power Ground
Frequency Select and External Clock Input:
SYNC = GND: Fixed-frequency mode with f
S
= 1100kHz.
SYNC = FLOAT: Fixed-frequency mode with f
S
= 1500kHz.
SYNC = V
DD
: Spread-spectrum mode with f
S
= 1200kHz
±
70kHz.
SYNC = Clocked: Fixed-frequency mode with f
S
= external clock frequency.
6, 14
4, 12
PGND
7
13
SYNC
8
14
MUTE
Active-Low Mute Function. Drive
MUTE
low to disable the H-bridge outputs. Connect to
V
DD
for normal operation.
H-Bridge Power Supply. Bypass to PGND with a 10μF ceramic capacitor.
Negative Speaker Output
Positive Speaker Output
9, 12
10
11
2, 15
16
1
PV
DD
OUT-
OUT+
13
3
SYNC_OUT
Internal Clock Output. Connect SYNC_OUT to the clock input of cascaded Maxim class
D amplifiers. Float SYNC_OUT if unused.
15
16
EP
5
6
G2
G1
EP
Gain Control 2 (See the
Gain Selection
Section)
Gain Control 1 (See the
Gain Selection
Section)
Exposed Paddle. Can be left floating or tied to GND.
EP
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9759ETE+ | 功能描述:音頻放大器 3.2W Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9759ETE+T | 功能描述:音頻放大器 3.2W Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9759EUE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX9759EUE+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 4.3W CLS-D 16TSSOP - Tape and Reel |
| MAX9759EVKIT | 功能描述:音頻放大器 Evaluation Kit for the MAX9759 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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