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PDF ( 数据手册 , 数据表 ) SGM4917

零件编号 SGM4917
描述 Stereo Headphone Amplifier
制造商 SG Micro
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SGM4917 数据手册, 描述, 功能
Preliminary Datasheet
SGM4917
125mW, Capless, Stereo Headphone
Amplifier with Shutdown
GENERAL DESCRIPTION
The SGM4917 stereo headphone amplifier is designed
for portable equipment where board space is at a
premium. The SGM4917 uses capless Direct-drive
architecture to produce a ground-referenced output from
a single power supply, eliminating the need for large
DC-blocking capacitors for output, and saving cost, board
space, and component height. Additionally, for
SGM4917B and SGM4917C, the gain is set internally
(-2V/V or -1.5V/V), further reducing component count.
For SGM4917A, the Gain can be adjusted by external
feedback resistors.
The SGM4917 delivers up to 125mW per channel into a
32load and has low 0.02% THD+N. A 78dB at 217Hz
power-supply rejection ratio (PSRR) allows this device to
operate from noisy digital supplies without an additional
linear regulator. Comprehensive click-and-pop circuitry
suppresses audible clicks and pops on startup and
shutdown.
FEATURES
SGM4917A: External Feedback Gain Network
SGM4917B: Fixed -2V/V Gain
SGM4917C: Fixed -1.5V/V Gain
No Bulky DC-Blocking Capacitors Required
Ground-Referenced Outputs Eliminate DC-Bias
Voltage on Headphone Ground Pin
No Degradation of Low-Frequency Response Due
to Output Capacitors
Differential Inputs for Enhanced Noise Cancellation
125mW per Channel into 32Headset
Low 0.02% THD+N
High PSRR (78dB at 217Hz)
Integrated Click-and-Pop Suppression
2.7V to 5.5V Single Supply Operation
Low Quiescent Current (2.7mA)
Shutdown Control
Undervoltage Lockout Function
-40to +85Operating Temperature Range
Green TSSOP16 and TQFN3×3-16L Packages
The SGM4917 operates from a single 2.7V to 5.5V
supply, consume only 2.7mA of supply current, and is
specified over the extended -40°C to +85°C temperature
range. The SGM4917 is available in a Green TSSOP16
and TQFN3×3-16L packages.
APPLICATIONS
Notebook PCs
Cellular Phones
PDAs
MP3 Players
Smart Phones
Portable Audio Equipment
SG Micro Limited
www.sg-micro.com
April 27, 2011







SGM4917 pdf, 数据表
SGM4917
125mW, Capless, Stereo Headphone
Amplifier with Shutdown
Functional Diagram/Typical Application Circuit
2.7V to 5.5V
C3
1µF
1
PVDD
2 C1P
C1
1µF
4 C1N
CHARGE
PUMP
LEFT
CHANNEL
AUDIO IN
CIN
1µF
9,13
SVDD
16
SHDN
15
INL+
14
INL-
RIN*
RF*
SVDD
_
UVLO/
SHUTDOWN
CONTROL
+
SVSS
CLICK-AND-POP
SUPPRESSION
SVDD
+
RIN*
_
OUTL 12
OUTR 10
HEADPHONE
JACK
SVSS
PVSS
5
SVSS
11
PGND
3
SGND
6
INR+
7
INR-
8
RF*
C2
1µF
* FOR SGM4917A, RIN AND RF ARE EXTERNAL TO THE DEVICE.
FOR SGM4917B, RIN = 15kΩ, RF = 30kΩ
FOR SGM4917C, RIN = 15kΩ, RF = 22.5kΩ
RIGHT
CHANNEL
AUDIO IN
CIN
1µF
Note: For ensure the normal operation of the device, 0.1µF decoupling capacitor (C3) must be placed as close to SGM4917,
otherwise the device will not start up at high supply voltage.
SG Micro Limited
www.sg-micro.com
8














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