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7.5Msps, Ultra-Low-Power Analog Front-End

Product Details

The MAX19700 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for TD-SCDMA handsets and data cards. Optimized for high dynamic performance at ultra-low power, the MAX19700 integrates a dual 10-bit, 7.5Msps receive (Rx) ADC, dual 10-bit, 7.5Msps transmit (Tx) DAC with TD-SCDMA baseband filters, and three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control. The typical operating power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps clock frequency.

The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR at a 1.87MHz input frequency with a 7.5Msps sample frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.22° phase and ±0.02dB gain.

The Tx DACs with TD-SCDMA lowpass filters feature -3dB cutoff frequency of 1.27MHz and >55dB stopband rejection at fIMAGE = 4.32MHz. The analog I/Q full-scale output voltage range is selectable at ±410mV or ±500mV. The output common-mode voltage is selectable from 0.9V to 1.4V and the I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.05dB gain and ±0.16° phase.

The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes and the aux-DAC channels.

The MAX19700 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19700 is specified for the extended (-40°C to +85°C) temperature range and is available in a 48-pin, thin QFN package. See a parametric table of the complete family of pin-compatible AFEs.

Key Features

  • Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC
  • Ultra-Low Power
    • 36.3mW at fCLK = 5.12Msps, Fast Mode
    • 19.8mW at fCLK = 5.12Msps, Slow Mode
    • Low Standby and Shutdown Current
  • Integrated TD-SCDMA Filters with >55dB Stopband Rejection
  • Excellent Dynamic Performance
    • SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC)
    • SFDR = 76.5dBc at fOUT = 620kHz (Tx DAC)
  • Excellent Gain/Phase Match
    • ±0.22° Phase, ±0.02dB Gain (Rx ADC) at fIN = 1.87MHz at -0.5dBFS
  • Three 12-Bit, 1µs Aux-DACs
  • Single-Supply Operation
  • Multiplexed Parallel Digital I/O
  • Serial-Interface Control
  • Versatile Power-Control Circuits
    • Shutdown, Standby, Idle, Tx-Rx Disable
  • Miniature 48-Pin Thin QFN Package (7mm x 7mm x 0.8mm)

Applications/Uses

  • Portable Communications Equipment
  • TD-SCDMA Data Cards
  • TD-SCDMA Handsets

Simplified Block Diagram

MAX19700: Functional Diagram MAX19700: Functional Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX19700 evaluation system (EV system) consists of a MAX19700 evaluation kit (EV kit), a companion Maxim command module (CMOD232) interface board, and software. Order the complete EV system (MAX19700EVCMOD2) for comprehensive evaluation of the MAX19700 using a personal computer. Order the EV kit (MAX19700EVKIT) if the command module has already been purchased with a previous Maxim EV system, or for custom use in other microcontroller-based (µC) systems.

The MAX19700 EV kit is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX19700 analog front-end (AFE). The MAX19700 integrates a dual receive analog-to-digital converter (Rx ADC), a dual transmit digital-to-analog converter (Tx DAC), a 1.024V internal voltage reference, and three low-speed serial DACs. The EV kit board accepts AC- or DC-coupled, differential or single-ended analog inputs for the Rx ADC and includes circuitry that converts the Tx DAC differential output signals to single-ended analog outputs. The EV kit includes circuitry that generates a clock signal from an AC sine-wave input signal. The EV kit operates from a +3.0V analog power supply, a +1.8V digital power supply, a +3.0V clock power supply, and ±5V bipolar power supplies.

The Maxim command module interface board (CMOD232) allows a PC to use its serial port to emulate an SPI 3-wire interface. Windows® 98/2000/XP-compatible software, which can be downloaded from www.maximintegrated.com, provides a user-friendly interface to exercise the features of the MAX19700. The program is menu driven and offers a graphical user interface (GUI) with control buttons and a status display.

View Details

Features

  • ADC/DAC Sampling Rate Up to 7.5Msps
  • Low-Voltage and Power Operation
  • Adjustable Gain Low-Speed DAC Buffers
  • On-Board Clock-Shaping Circuitry
  • On-Board Level-Translating I/O Drivers
  • Assembled and Tested
  • Include Windows 98/2000/XP-Compatible Software

Description

The MAX19700 evaluation system (EV system) consists of a MAX19700 evaluation kit (EV kit), a companion Maxim command module (CMOD232) interface board, and software. Order the complete EV system (MAX19700EVCMOD2) for comprehensive evaluation of the MAX19700 using a personal computer. Order the EV kit (MAX19700EVKIT) if the command module has already been purchased with a previous Maxim EV system, or for custom use in other microcontroller-based (µC) systems.

The MAX19700 EV kit is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX19700 analog front-end (AFE). The MAX19700 integrates a dual receive analog-to-digital converter (Rx ADC), a dual transmit digital-to-analog converter (Tx DAC), a 1.024V internal voltage reference, and three low-speed serial DACs. The EV kit board accepts AC- or DC-coupled, differential or single-ended analog inputs for the Rx ADC and includes circuitry that converts the Tx DAC differential output signals to single-ended analog outputs. The EV kit includes circuitry that generates a clock signal from an AC sine-wave input signal. The EV kit operates from a +3.0V analog power supply, a +1.8V digital power supply, a +3.0V clock power supply, and ±5V bipolar power supplies.

The Maxim command module interface board (CMOD232) allows a PC to use its serial port to emulate an SPI 3-wire interface. Windows® 98/2000/XP-compatible software, which can be downloaded from www.maximintegrated.com, provides a user-friendly interface to exercise the features of the MAX19700. The program is menu driven and offers a graphical user interface (GUI) with control buttons and a status display.

View Details

Features

  • ADC/DAC Sampling Rate Up to 7.5Msps
  • Low-Voltage and Power Operation
  • Adjustable Gain Low-Speed DAC Buffers
  • On-Board Clock-Shaping Circuitry
  • On-Board Level-Translating I/O Drivers
  • Assembled and Tested
  • Include Windows 98/2000/XP-Compatible Software

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Parameters

Key Features

  • Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC
  • Ultra-Low Power
    • 36.3mW at fCLK = 5.12Msps, Fast Mode
    • 19.8mW at fCLK = 5.12Msps, Slow Mode
    • Low Standby and Shutdown Current
  • Integrated TD-SCDMA Filters with >55dB Stopband Rejection
  • Excellent Dynamic Performance
    • SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC)
    • SFDR = 76.5dBc at fOUT = 620kHz (Tx DAC)
  • Excellent Gain/Phase Match
    • ±0.22° Phase, ±0.02dB Gain (Rx ADC) at fIN = 1.87MHz at -0.5dBFS
  • Three 12-Bit, 1µs Aux-DACs
  • Single-Supply Operation
  • Multiplexed Parallel Digital I/O
  • Serial-Interface Control
  • Versatile Power-Control Circuits
    • Shutdown, Standby, Idle, Tx-Rx Disable
  • Miniature 48-Pin Thin QFN Package (7mm x 7mm x 0.8mm)

Applications/Uses

  • Portable Communications Equipment
  • TD-SCDMA Data Cards
  • TD-SCDMA Handsets

Description

The MAX19700 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for TD-SCDMA handsets and data cards. Optimized for high dynamic performance at ultra-low power, the MAX19700 integrates a dual 10-bit, 7.5Msps receive (Rx) ADC, dual 10-bit, 7.5Msps transmit (Tx) DAC with TD-SCDMA baseband filters, and three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control. The typical operating power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps clock frequency.

The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR at a 1.87MHz input frequency with a 7.5Msps sample frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.22° phase and ±0.02dB gain.

The Tx DACs with TD-SCDMA lowpass filters feature -3dB cutoff frequency of 1.27MHz and >55dB stopband rejection at fIMAGE = 4.32MHz. The analog I/Q full-scale output voltage range is selectable at ±410mV or ±500mV. The output common-mode voltage is selectable from 0.9V to 1.4V and the I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.05dB gain and ±0.16° phase.

The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes and the aux-DAC channels.

The MAX19700 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19700 is specified for the extended (-40°C to +85°C) temperature range and is available in a 48-pin, thin QFN package. See a parametric table of the complete family of pin-compatible AFEs.

Simplified Block Diagram

MAX19700: Functional Diagram MAX19700: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal