Electronic scheme

Power-Management ICs for ICERA E400

The MAX8982A/MAX8982P/MAX8982X are complete power-management ICs for the latest LTE/WCDMA/GSM/GPRS/EDGE data card based on the new ICERA platform (E400). The MAX8982A operates from a 4.1V to 5.5V supply and contains four efficient step-down converters, nine low dropout linear regulators (LDOs) to power all RF and baseband circuitry, three current regulators with programmable current up to 24mA and embedded flash timers, and an I²C serial interface to program individual regulator output voltages as well as on/off control for flexibility. The linear regulators provide greater than 60dB PSRR, less than 45µV of output noise, and minimal cross coupling noise between LDOs.

The MAX8982X/MAX8982P operates from a 2.9V to 5.5V supply. The MAX8982X has the same features as the MAX8982A, except it does not have BUCK3, BUCK4, and LDO8. The MAX8982P has the same features as the MAX8982A.

All buck converters and LDOs are enabled/disabled by either I²C or PWR_REQ control signal after power-up. This feature provides more flexibility in system design.
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Power Supply Boost Converter and Gate

The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one boost converter, one 1.8V/3.3V regulator controller, and two gate voltage regulators. The device comes in several versions to satisfy common automotive TFT-LCD power-supply requirements (see the Ordering Information table in the full data sheet).

The boost converter uses spread-spectrum modulation to reduce peak interference and to optimize EMI performance. The sequencing input (SEQ) allows flexible sequencing of the positive-gate and negative-gate voltage regulators. The power-good indicator (PGOOD) indicates a failure on any of the converters or regulator outputs. Integrated thermal shutdown circuitry protects the device from overheating.

The MAX16928 is available in a 20-pin TSSOP package with exposed pad and operates over the -40°C to +105°C temperature range.

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Power Management High-Efficiency

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Microcontroller with Hardware Multiplier

The MAXQ615 is a low-power, 16-bit MAXQ® microcontroller designed for low-power applications. The device combines a powerful 16-bit RISC microcontroller and integrated peripherals including multiple high-speed serial communication interfaces and flexible port I/O. High-speed communication interfaces include dual SPI and I²C. The device also provides three instances of the 16-bit timer B peripheral. A 16 x 16 hardware multiply/accumulate with 48-bit accumulator provides support for computationally intensive applications. The device provides 48KB of flash memory and 2KB of data SRAM. For the ultimate in low-power performance, the device includes an ultra-low-power stop mode (0.2µA typ). In this mode, the minimum amount of circuitry is powered. Wake-up sources include external interrupts, the power-fail interrupt, and a timer interrupt. The microcontroller runs from a single 2.4V to 3.6V power-supply operating voltage.
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Check Phase For Audio System

A balanced cable has three conductors

1) A ground conductor which carries no signal, just the "ground" or "0"
reference against which signal in the other conductors fluctuates.
2)A "hot"or"+" conductor which carriers the normal-phase audio signal.
3)A "cold"or "-" conductor which carriers the reverse-phase audio noramal.