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PDF SGM4917 Data sheet ( Hoja de datos )
| Número de pieza | SGM4917 | |
| Descripción | Stereo Headphone Amplifier | |
| Fabricantes | SG Micro | |
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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
32Ω load 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 32Ω Headset
• 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
• -40℃ to +85℃ Operating 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
１
1 page  
SGM4917
125mW, Capless, Stereo Headphone
Amplifier with Shutdown
TYPICAL PERFORMANCE CHARACTERISTICS
THD+N vs. Output Power
10
ONE CHANNEL
DRIVEN
1
OUTPUTS IN
PHASE
0.1
0.01
0
VDD = 5V
RL = 32Ω
f = 1kHz
BW < 20kHz
50 100 150
Output Power (mW)
200
350
300
250
200
150
100
50
0
0
Power Dissipation vs. Output Power
OUTPUTS IN
PHASE
ONE CHANNEL
DRIVEN
VDD = 5V, RL = 32Ω
f = 1kHz, BW < 20kHz
50 100 150 200 250 300
Output Power (mW)
THD+N vs. Output Power
10
ONE CHANNEL
DRIVEN
OUTPUTS IN
1 PHASE
0.1
0.01
0
VDD = 3V
RL = 32Ω
f = 1kHz
BW < 20kHz
20 40 60 80
Output Power (mW)
100
Power Dissipation vs. Output Power
150
120
OUTPUTS IN
PHASE
90 ONE CHANNEL
DRIVEN
60
30
0
0
VDD = 3V, RL = 32Ω
f = 1kHz, BW < 20kHz
20 40 60 80 100 120
Output Power (mW)
Output Power vs. Supply Voltage
250
RL = 32Ω, f = 1kHz, BW < 20kHz
200 ONE CHANNEL DRIVEN
THD+N 10%
150
100
THD+N 1%
50
0
2.5 3 3.5 4 4.5 5 5.5
Supply Voltage (V)
Output Power vs. Supply Voltage
250
RL = 32Ω, f = 1kHz, BW < 20kHz
200 OUTPUTS IN PHASE
150 THD+N 10%
100
50 THD+N 1%
0
2.5 3 3.5 4 4.5 5
Supply Voltage (V)
5.5
SG Micro Limited
www.sg-micro.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SGM4917.PDF ] | |
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