AD9868

• Product Introduction

The AD9868 is a functional application IC for mixed-signal front-end (MxFE ®) transceivers that require a Tx channel and a receive path with data rates up to 80 MSPS.At a lower cost, pin-compatible version of the AD9865, the AD9868 removes the current amplifier (IAMP) IOUTP function, limiting the PLL VCO to 80 MHz to 200 MHz operating range.The device is also ideal for half- and full-duplex applications.The digital interface is very flexible, allowing the backend of a simple digital interface to support half-duplex or full-duplex data transfer, often making the AD9868 a replacement for discrete ADC and DAC solutions.Power saving mode includes the ability to reduce power consumption for unused blocks for a single functional module or drop half-duplex application.A serial interface (SPI) enables the programming of the various functional modules of the software.The on-chip PLL clock multiplier and synthesizer provide all the required internal clocks, as well as two clocks from a single crystal or external clock source.The TX signal path consists of a 2x/4x low-pass filter, a 10-bit TxDAC, and a line driver.The transmission bandwidth of the path signal can be used at an input data rate of up to 34 MHz at an 80 MSPS.The TxDAC series provides differential 17 dBm of power for peak signals that can be directly led to external loads or internal low-distortion current amplifier current output (IAMP).The transmit power can be digitally controlled in the range of 19.5 dB in 0.5 dB steps.The receive path contains a programmable amplifier (RxPGA), an adjustable low-pass filter (LPF), and a 10-bit ADC.The low-noise RxPGA has a gain of -12 dB programmable to +48 dB in the range of 1 dB.The gain after the input reference noise is less than 3 nanovolts is set to 36 dB/√Hz.The low-pass filter cut-off frequency can be set to the receive channel in the range of 15 MHz to 35 MHz or simply bypassed.The 10-bit ADC delivers superior power performance over a span of up to 80 MSPS.Both RxPGA and ADC provide scalability, allowing power consumption/performance optimization.The AD9868 provides a highly integrated solution for many broadband modems.It is available in a space-saving package, 16-pin LFCSP package and is available over a commercial temperature range (-40°C to +85°C).applyWireless broadband network