Chapter 1 31
Audio Amplifier
Subwoofer Speaker
Front Speaker
Center Speaker
Item Specification
Model Panasonic 12947A
Package 48 pins QFP
Features • Microsoft Windows Vista Compliant
• High +90dB PSRR, Low -80dB THD+N
• Class AB 2.2W (max.) Stereo BTL Speaker Amplifier
• Built-in direct drive headphone amplifier within charge pump
• AGC adjusted circuit function implement
• STBY function support on speaker and headphone (countermeasure
pop noise)
• RF noise prevention
• Built-in over current protection
• External adjustable speaker and headphone amplifier gain
Item Specification
Vendor and Model Maxim MAX9737
Package 24pins TQFN
Features • Spread-spectrum modulation enable for low EMI solution
• High PSRR 80dB
• Up to 88% efficiency eliminate heatsink
• Thermal and Output current protection
• Shut-down mode current <1uA
• Click and pop suppression
• Turn on time < 10ms
• Support 3W/4ohm power output
Power supply 8~28V
Item Specification
Vendor and Model GMT 1453L
Package 16 pins TQFN
Weight • Support 2W/4ohm power output
• Depop circuitry integrated
• Stereo bridge-tied load (BTL)
• Shut-down control available (<1uA)
Power supply +5V
Item Specification
Vendor and Model GMT 1442
Package 8 pins TDFN
Weight • Support 2W/4ohm power output
• Depop circuitry integrated
• Stereo bridge-tied load (BTL)
• Shut-down control available (<1uA))
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