Sharp LC-42SV32B Service Manual page 45

Table of Contents

2.5 U606(MAX9728AETC+)

General Description

The MAX9728A/MAX9728B stereo headphone amplifiers are designed for display and notebook applications or portable equipment where board space is

at a premium. These devices use a unique, patented DirectDrive™ architecture to produce a ground-referenced output from a single supply, eliminating

the need for large DC-blocking capacitors, saving cost, board space, and component height. The MAX9728A offers an externally adjustable gain, while the

MAX9728B has an internally preset gain of -1.5V/V. The MAX9728A/MAX9728B deliver up to 60mW per channel into a 32Ω load and have low 0.02%

THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear

regulator. Comprehensive clickand-pop circuitry suppresses audible clicks and pops on startup and shutdown.

The MAX9728A/MAX9728B operate from a single 4.5V to 5.5V supply, consume only 3.5mA of supply current, feature short-circuit and thermal-overload

protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 12-pin Thin QFN (3mm x 3mm x

0.8mm) and 14-pin TSSOP packages (5mm x 4.4mm x 1.1mm).

Features

♦ No Bulky DC-Blocking Capacitors Required

♦ Low-Power Shutdown Mode, < 0.1µA

♦ Adjustable Gain (MAX9728A) or Fixed -1.5V/V Gain (MAX9728B)

♦ Low 0.02% THD+N

♦ High PSRR (80dB at 1kHz) Eliminates LDO

♦ Integrated Click-and-Pop Suppression

♦ 4.5V to 5.5V Single-Supply Operation

♦ Low Quiescent Current (3.5mA)

♦ Available in Space-Saving Packages

12-Pin Thin QFN (3mm x 3mm x 0.8mm)

14-Pin TSSOP (5mm x 4.4mm x 1.1mm)

Applications

Notebook PCs

DVD Players

LCD/PDP Displays

CRT TVs

Multimedia Monitors

2.6 U116(MAX3232ECPWR)

General Description

The MAX3232E device consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV IEC ESD protection pin to pin (serial-

port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous

communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V

supply. The devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/ms driver output slew rate.

Features

· ESD Protection for RS-232 Bus Pins

– ±15 kV (HBM)

– ±8 kV (IEC61000-4-2, Contact Discharge)

– ±15 kV (IEC61000-4-2, Air-Gap Discharge)

· Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards

· Operates With 3-V to 5.5-V VCC Supply

· Operates up to 250 kbit/s

· Two Drivers and Two Receivers

· Low Supply Current . . . 300 mA Typ