آر اف (فرکانس رادیویی) و بی‌سیم میکسر آر اف

Product Attributes

Introduction

The TMC2249A is a high-speed digital arithmetic circuit consisting of two 12-bit multipliers, an adder and a cascadeable accumulator. All four multiplier inputs are simultaneously accessible to the user, and each includes a user-programmable pipeline delay of up to 16 clocks in length. The 24-bit adder/subtractor is followed by an accumulator and 16-bit input port which allows the user to cascade multiple TMC2249As. A new 16-bit accumulated output is available every clock, up to the maximum rate of 60 MHz. All inputs and outputs are registered except the three-state output enable, and all are TTL compatible. The TMC2249A utilizes a pipelined, bus-oriented structure offering significant flexibility. Input register clock enables and programmable input data pipeline delays on each port offer an adaptable input structure for high-speed digital systems. Following the multipliers, the user may perform addition or subtraction of either product, arithmetic rounding to 16 bits, and accumulation and summation of products with a cascading input. The output port allows access to all 24 bits of the internal accumulator by switching between overlapping least and most-significant 16-bit words, and a three-state output enable simplifies connection to an external system bus. Fabricated in a submicron CMOS process, the TMC2249A operates at guaranteed clock rates of up to 60 MHz over the full temperature and supply voltage ranges. It is pin- and function-compatible with Fairchild’s TMC2249, while providing higher speed operation and lower power dissipation. It is available in a 120 pin Ceramic Pin Grid Array (CPGA), 120 pin Plastic Pin Grid Array (PPGA), 120 lead MQFP to PPGA package (MPGA), and a 120 lead Metric Quad FlatPack (MQFP).

Features

• 60 MHz input and computation rate
• Two 12-bit multipliers
• Separate data and coefficient inputs
• Independent, user-selectable pipeline delays of 1 to 16 clocks on all input ports
• Separate 16-bit input port allows cascading or addition of a constant
• User-selectable rounded output
• Internal 1/2 LSB rounding of products
• Fully registered, pipelined architecture
• Available in 120-Pin CPGA, PPGA, MPGA or MQFP

Applications

• Video switching
• Image mixing
• Digital signal modulation
• Complex frequency synthesis
• Digital filtering
• Complex arithmetic functions