Band III, IV, IX, and X WCDMA Femtocell Transceiver with GSM Monitoring

Accelerate Deployment with Worldwide Field-Proven Performance and the Most Compact Radio Design

Description

The MAX2552 is a complete single-chip RF-to-bits and bits-to-RF radio transceiver. This device is in compliance with the 3GPP TS25.104 femtocell standard for Band III, IV, IX, and X. It is equipped with multiple receive inputs and transmit outputs for low band, high band, and macro- cell monitoring.

This fully integrated transceiver facilitates compact radio designs for dongle and stand-alone femtocell products by minimizing external component count. Maxim’s MAX-PHY serial interface is used to drastically reduce IC pin count, while worldwide field-proven architecture accelerates time to product deployment.

The device features unparalleled receive blocker performance and the industry’s lowest noise figure for higher data rates and range. Low-power operational modes are available to minimize power consumption. The transmitter is designed to deliver EVM far exceeding the standard requirement at 0dBm.

The MAX2552/MAX2553 is a family of pin-compatible transceivers that cover all major WCDMA and cdma2000®bands. All parts are controlled by a 4-wire interface. The MAX2552 is packaged in a compact 7mm x 7mm TQFN and specified over the -40°C to +85°C extended temperature range. A complete radio reference design is available to facilitate custom designs.

Key Features

Single-Chip Femtocell Radio Transceiver
WCDMA/HSPA+ Band III, IV, IX, and X Operation
TS25.104 Standard Compliant
Multiple LNA Inputs for WCDMA, PCS, and GSM Macrocell Monitoring (Bands II, III, IV, V, IX, and X)
High Level of Integration
- On-Chip Fractional-N Frequency Synthesizers for LO Generation
- No Tx SAW Filters Required
- ntegrated PA Drivers for Lower-Cost Power Amplifier Designs
- 12-Bit AFC DAC to Control TCXO
- On-Chip Temperature Sensor
- Three General-Purpose Outputs
- Reference Clock with Selectable CMOS and Low Swing Output
- PLL Lock-Detect Output Through GPO3
Optimized Receiver Performance
- Exceptional Receive Sensitivity
- High Dynamic Range Sigma-Delta ADCs Allow Simple AGC Implementation with Switched Gain States
Optimized Transmitter Performance
- Factory Calibrated for Gain, Carrier Leakage, and Sideband Suppression
- 10-Bit Gain-Control Resolution for Better Power Accuracy
- 60dB Gain-Control Range
Loopback Operating Mode from Tx Baseband Input to Rx Baseband Output
MAX-PHY Serial Digital Interface
SPI Read/Write Functionality
Operation Controlled by 4-Wire Serial Interface
Low-Cost, 7mm x 7mm TQFN Package

MAX8973A

9A, Three-Phase Step-Down Switching Regulator

Meets Increasing Demand for Performance and Aggressive Form Factor Requirements in Next-Generation Smartphone Designs

Description

The MAX8973A high-efficiency, three-phase, DC-DC step-down switching regulator delivers up to 9A of output current in a compact footprint with excellent transient response. Each phase operates at a 2MHz fixed frequency, allowing the use of small magnetic components. Maxim Integrated’s proprietary Rotational Phase Spreading algorithm optimizes efficiency at low output currents. Software-selectable forced-PWM mode allows either fixed-frequency operation, or improved efficiency at light load with a variable frequency in skip mode. The triple-inductor architecture reduces the size of the external components while providing the benefit of ripple current cancellation. The MAX8973A operates from a 2.6V to 4.5V input voltage range.

An I²C 3.0-compatible serial interface, supporting clock rates up to 3.4MHz, controls key regulator parameters such as output voltage, output slew rate, and on/off control. Output voltage is programmable from 0.60625V to 1.4V in 6.25mV increments. The default output voltage is factory programmable. An EN input enables and disables the output, while a DVS pin selects two different output voltages without relying on the serial interface.

Fully differential remote sense ensures precise DC regulation at the point of load. Total output error is less than 0.8% over, line, and temperature at 1.2V output. Output ripple is typically < 1% of the output voltage setting when the processor is in the Idle state (light loads) and < 0.5% at medium and high loads.

Other features include internal soft-start control circuitry to reduce inrush current, guaranteed monotonic voltage adjustment, over-current protection, and over-temperature protection. The MAX8973A operates over the -40°C to +85°C extended temperature range and is packaged in an ultra-small WLP package.

Key Features

Up to 9A Output Current
> 91% Peak Efficiency at 3.6VIN, 1.2VOUT
Rotational Phase Spreading Maximizes Efficiency at Light Loads
Initial Accuracy of 0.5% at 1.2V Output
0.8% Output Accuracy Over Line and Temperature at 1.2V Output
Enhanced Transient Response Minimizes Output Droop with Large Load Steps
Soft-Stop Recovers Output Capacitor Charge When Converter is Disabled
Programmable VOUT: 0.60625V to 1.4V (6.25mV step size)
Powers Up into Prebiased Output
3.4MHz I²C 3.0-Compatible Serial Interface
Fixed 2MHz PWM Switching Frequency per Phase
Small (< 1µH) Inductor for Each Phase
Overcurrent, Short-Circuit, and Thermal Protection