National Semiconductor’s New 12-Bit ADCs for WiMAX Provide the Industry’s Highest SFDR of 84.1 dB at 250 MHz Input Frequency
The ADC12C170 is a high-performance CMOS analog-to digital converter capable of converting analog input signals into 12-Bit digital words at rates up to 170 Mega Samples Per Second (MSPS). This converter uses a differential, pipelined architecture with digital error correction and an on-chip sample- and-hold circuit to minimize power consumption and the external component count, while providing excellent dynamic performance. A unique sample-and-hold stage yields a full power bandwidth of 1.1 GHz. The ADC12C170 operates from dual +3.3V and +1.8V power supplies and consumes 715 mW of power at 170 MSPS.
The separate +1.8V supply for the digital output interface allows lower power operation with reduced noise. A powerdown feature reduces the power consumption to 5 mW while still allowing fast wake-up time to full operation. In addition there is a sleep feature which consumes 50 mW of power and has a faster wake-up time.
The differential inputs provide a full scale differential input swing equal to 2 times the reference voltage. A stable 1.0V internal voltage reference is provided, or the ADC12C170 can be operated with an external reference.
Clock mode (differential versus single-ended) and output data format (offset binary versus 2s complement) are pin-selectable. A duty cycle stabilizer maintains performance over a wide range of input clock duty cycles.
The ADC12C170 is pin compatible with the ADC14155, ADC11C125 and ADC11C170.
It is available in a 48-lead LLP package and operates over the industrial temperature range of 40°C to +85°C.
主要特性:
■ 1.1 GHz Full Power Bandwidth
■ Internal sample-and-hold circuit
■ Low power consumption
■ Internal precision 1.0V reference
■ Single-ended or Differential clock modes
■ Clock Duty Cycle Stabilizer
■ Dual +3.3V and +1.8V supply operation
■ Power-down and Sleep modes
■ Offset binary or 2s complement output data format
■ Pin-compatible: ADC14155, ADC11C125, ADC11C170
■ 48-pin LLP package, (7x7x0.8mm, 0.5mm pin-pitch)
应用范围:
■ High IF Sampling Receivers
■ Wireless Base Station Receivers
■ Power Amplifier Linearization
■ Multi-carrier, Multi-mode Receivers
■ Test and Measurement Equipment
■ Communications Instrumentation
■ Radar Systems
图1.ADC12C170方框图: