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參數(shù)資料
| 型號： | MAX9720BEBE-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 50mW, DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown |
| 中文描述： | 0.05 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA16 |
| 封裝： | 2 X 2 MM, 0.6 MM HEIGHT, UCSP-16 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大小： | 508K |
| 代理商： | MAX9720BEBE-T |
M
Detailed Description
The MAX9720 fixed-gain, stereo headphone amplifier
includes Maxim
’
s patented DirectDrive architecture and
SmartSense. DirectDrive eliminates the large output-
coupling capacitors required by conventional single-
supply headphone amplifiers. SmartSense automatically
detects the presence of a short at either output. Under a
fault condition, the shorted output is automatically
disabled and the stereo input signal is automatically
mixed and routed to the remaining active channel. This
prevents damage to the amplifier and optimizes power
savings by eliminating battery drain into a shorted load.
The device consists of two 50mW Class AB headphone
amplifiers, an internal feedback network (MAX9720A:
fixed -1V/V gain, MAX9720B: fixed -1.41V/V gain), a
mono mixer/attenuator, undervoltage lockout (UVLO)/
shutdown control, SmartSense, a charge pump, and
comprehensive click-and-pop suppression circuitry
(see
Functional Diagram
). The charge pump inverts the
positive supply (V
DD
), creating a negative supply
(PV
SS
). The headphone amplifiers operate from these
bipolar supplies with their outputs biased about GND
(Figure 1). The amplifiers have almost twice the supply
range compared to other single-supply amplifiers,
nearly quadrupling the available output power. The
benefit of the GND bias is that the amplifier outputs do
not have a DC component (typically V
DD
/2). This elimi-
nates the large DC-blocking capacitors required with
conventional headphone amplifiers, conserving board
space, system cost, and improving frequency
response.
The noninvasive SmartSense feature of the MAX9720
detects a short on either output. The SmartSense routine
executes when the device is powered up or brought out
of shutdown (see the
SmartSense
section). If a fault is
detected, the shorted channel is shut down, the output
goes high impedance, and the stereo audio input is
mixed/attenuated and fed to the remaining active chan-
nel. The device also features an
ALERT
output that indi-
cates to a host μC that SmartSense has detected a
short-circuit condition on either amplifier output.
Forced stereo and forced mono modes can also be
selected through the two MODE_ inputs. In forced
operation mode, SmartSense is disabled and the
device operates as specified by the MODE_ inputs,
regardless of output load conditions. A fast low-power
shutdown mode is also selected through the MODE_
inputs (see the
Mode_ Selection
section).
The UVLO prevents operation from an insufficient
power supply and click-and-pop suppression, which
eliminates audible transients on startup and shutdown.
Additionally, the MAX9720 features thermal overload
protection and can withstand
±
4kV ESD strikes on the
output.
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
10
______________________________________________________________________________________
Pin Description
PIN
BUMP
UCSP
D2
C2
D1
C1
B1
A1
B2
A2
A3
B3
A4
B4
C4
D4
C3
D3
TSSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
FUNCTION
V
DD
MODE1
C1P
PGND
C1N
PV
SS
MODE2
ALERT
INL
TIME
INR
SGND
SV
SS
OUTR
HPS
OUTL
Positive Power Supply
Mode Select 1 Logic Input
Flying Capacitor Positive Terminal
Power Ground. Connect to SGND.
Flying Capacitor Negative Terminal
Charge-Pump Output
Mode Select 2 Logic Input
Open-Drain Interrupt Logic Output
Left-Channel Audio Input
Debouncing Timer Capacitor
Right-Channel Audio Input
Signal Ground. Connect to PGND.
Amplifier Negative Power Supply. Connect to PV
SS.
Right-Channel Output
Headphone Sense Input
Left-Channel Output
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9720BEUE | 制造商:Maxim Integrated Products 功能描述:50MW, DIRECTDRIVE, STEREO HEADPHONE AMPLIFIER - Rail/Tube |
| MAX9721AEBC | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AEBC-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AETC | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9721AETC+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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