آر اف (فرکانس رادیویی) و بی‌سیم سایر آی سی‌ و ماژول‌های آر اف

Product Attributes

Introduction

The AD6677 is an 11-bit, 250 MSPS, intermediate frequency (IF) receiver specifically designed to support multi-antenna systems in telecommunication applications where high dynamic range performance, low power, and small size are desired. The device consists of a high performance ADC and an NSR digital block. The ADC consists of a multistage, differential pipelined architecture with integrated output error correction logic, and each ADC features a wide bandwidth switched capacitor sampling network within the first stage of the differential pipeline. An integrated voltage reference eases design considerations. A duty cycle stabilizer compensates for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance. The ADC output is connected internally to an NSR block. The integrated NSR circuitry allows for improved SNR performance in a smaller frequency band within the Nyquist bandwidth. The device supports two different output modes selectable via the serial port interface (SPI). With the NSR feature enabled, the output of the ADC is processed such that the AD6677 supports enhanced SNR performance within a limited portion of the Nyquist bandwidth while maintaining an 11-bit output resolution.

Features

• JESD204B Subclass 0 or Subclass 1 coded serial digital outputs
• Signal-to-noise ratio (SNR) = 71.9 dBFS at 185 MHz AIN and 250 MSPS with noise shaping requantizer (NSR) set to 33%
• Spurious-free dynamic range (SFDR) = 87 dBc at 185 MHz AIN and 250 MSPS
• Total power consumption: 435 mW at 250 MSPS 1.8 V supply voltages
• Integer 1 to 8 input clock divider
• Sample rates of up to 250 MSPS
• IF sampling frequencies of up to 400 MHz
• Internal analog-to-digital converter (ADC) voltage reference
• Flexible analog input range 1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)
• ADC clock duty cycle stabilizer (DCS)
• Serial port control
• Energy saving power-down modes

Applications

• Communications
• Diversity radio and smart antenna multiple input, multiple output (MIMO) systems
• Multimode digital receivers (3G) TD-SCDMA, WiMAX, W-CDMA, CDMA2000, GSM, EDGE, LTE
• I/Q demodulation systems
• General-purpose software radios