Sharp LC-19LS410UT, Service Manual

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2008-03-14
LC-19LS410UT, LC-22LS510UT
45
· High Power Supply Noise Rejection
– 100 dB PSRR at 217 Hz
– 90 dB PSRR at 10 kHz
· Wide Power Supply Range: 2.3 V to 5.5 V
· Gain Settings: –6 dB, 0 dB, 3 dB, and 6 dB
· Short-Circuit and Thermal-Overload Protection
· ±8 kV HBM ESD Protected Outputs
· Small Package Available
– 16-Pin, 3 mm × 3 mm Thin QFN
APPLICATIONS
· Smart Phones / Cellular Phones
· Notebook Computers
· CD / MP3 Players
· Portable Gaming
DESCRIPTION
The TPA6132A2 (sometimes referred to as TPA6132) is a DirectPath™ stereo headphone amplifier that eliminates the need for external dc-blocking
output capacitors. Differential stereo inputs and built-in resistors set the device gain, further reducing external component count. Gain is selectable at –6
dB, 0 dB, 3 dB or 6 dB. The amplifier drives 25 mW into 16 Ω speakers from a single 2.3 V supply. The TPA6132A2 (TPA6132) provides a constant
maximum output power independent of the supply voltage, thus facilitating the design for prevention of acoustic shock.
The TPA6132A2 (TPA6132) features fully differential inputs to reduce system noise pickup between the audio source and the headphone amplifier. The
high power supply noise rejection performance and differential architecture provides increased RF noise immunity. For single-ended input signals, connect
INL+ and INR+ to ground.
The device has built-in pop suppression circuitry to completely eliminate disturbing pop noise during turn-on and turn-off. The amplifier outputs have short-
circuit and thermal-overload protection along with ±8 kV HBM ESD protection, simplifying end equipment compliance to the IEC 61000-4-2 ESD standard.
The TPA6132A2 (TPA6132) operates from a single 2.3 V to 5.5 V supply with 2.1 mA of typical supply current. Shutdown mode reduces supply current to
less than 1 mA.
1.6. U606 (ICL3232ECV-16Z TSSOP-16)
The Intersil ICL32xxE devices are 3.0V to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at
VCC = 3.0V. Additionally, they provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver
inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby,
power consumption is critical. Efficient on-chip charge pumps, coupled with manual and automatic power-down functions (except for the ICL3232E),
reduce the standby supply current to a 1µA trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space
savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. This family is fully compatible with 3.3V-only systems,
mixed 3.3V and 5.0V systems, and 5.0V-only systems.
The ICL324XE are 3-driver, 5-receiver devices that provide a complete serial port suitable for laptop or notebook computers. Both devices also include
noninverting always-active receivers for “wake-up” capability.
The
ICL3221E, ICL3223E and ICL3243E,
feature an
automatic power-down
function which powers down the on-chip power-supply and driver circuits.
This occurs when an attached peripheral device is shut off or the RS-232 cable is removed, conserving system power automatically without changes to the
hardware or operating system. These devices power up again when a valid RS-232 voltage is applied to any receiver input.
Features
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Drop in Replacements for MAX3221E, MAX3222E, MAX3223E, MAX3232E, MAX3241E, MAX3243E, SP3243E
• ICL3221E is a Low Power, Pin Compatible Upgrade for 5V MAX221E
• ICL3222E is a Low Power, Pin Compatible Upgrade for 5V MAX242E, and SP312E
• ICL3232E is a Low Power Upgrade for HIN232E, ICL232 and Pin Compatible Competitor Devices
• RS-232 Compatible with VCC = 2.7V
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External 0.1µF Capacitors
• Manual and Automatic Power-down Features