Configurable PDAs provide optimized noise and distortion performance over entire gain range

DALLAS, Sept. 19, 2012 — (PRNewswire) — Texas Instruments Incorporated (TI) (NASDAQ: TXN) today introduced the world's first programmable differential amplifiers (PDAs). The 2.4-GHz LMH6881 single-channel PDA and 2.4-GHz LMH6882 dual-channel PDA provide optimized noise, distortion and bandwidth performance over a 6-dB to 26-dB gain range, simplifying the way engineers design with differential amplifiers. Designing systems with PDAs increases flexibility and significantly reduces design time, solution size and bill of materials (BOM) cost for a broad range of applications. For more information or to place an order, visit www.ti.com/lmh688x-pr.

PDAs combine the best of fully-differential amplifiers (FDAs) and digital variable gain amplifiers (DVGAs). They allow engineers to easily modify their designs by changing gain without having to adjust external resistors, replace amplifiers, or reconfigure and optimize each gain stage. Compared to traditional DVGAs, TI's PDAs offer more consistent noise and distortion performance over the entire gain range. The programmable gain control in the LMH6881 and LMH6882 eliminates the need for gain-setting resistors and their associated mismatch errors, enabling more robust systems for applications, such as medical, test and measurement, military, wireless communications, and microwave backhaul. Watch a video at www.ti.com/lmh6881v-pr.

Key features and benefits of the LMH6881 and LMH6882:

• Optimized performance: Both devices maintain excellent noise and distortion performance over the entire gain range. Specifications at maximum gain (26 dB) and 100-MHz input frequency are: 9.7-dB noise figure, 44-dBm OIP3, and -100 dBc HD3.
• Easy to use: Gain control can be implemented via SPI bus or dedicated pins, with no external resistors needed.
• Maximum flexibility: Support for DC/AC coupling and single-ended-to-differential conversion eliminates the need for a balun, giving designers the flexibility to operate from DC to high frequencies with minimal external components.
• Dual-channel gain/phase matching: LMH6882's channel gain matching of 0.2 dB and phase matching of 1.5 degrees provide excellent image rejection for wideband zero IF and I/Q sampling applications.
• Drive high-performance ADCs: Drive high-speed analog-to-digital converters (ADCs), such as the 8-bit, single-channel ADC083000; 10-bit, dual-channel ADC10D1500; 12-bit, dual-channel ADC12D1800RF; and 14-bit, single-channel ADS4149.

Tools and support
TI offers a variety of tools and support to speed development with the LMH6881 and LMH6882 PDAs. The following evaluation modules (EVMs), as well as TINA-TI SPICE models and reference designs, are available today to quickly evaluate these devices and accelerate system development:

LMH6881

• TINA-TI SPICE model: www.ti.com/lmh6881spice-pr.  
• LMH6881EVAL EVM, with suggested retail price of US$149: www.ti.com/lmh6881evm-pr.  
• Reference design: www.ti.com/lmh6881ref-pr.

LMH6882

• TINA-TI SPICE model: http://www.ti.com/lmh6882spice-pr.
• LMH6882EVAL EVM, with suggested retail price of US$199: www.ti.com/lmh6882evm-pr.  
• Reference design: www.ti.com/lmh6882ref-pr.  

Engineers designing with either the LMH6881 or LMH6882 can also ask questions and get answers from TI experts in the TI E2E™ Community High Speed Amplifiers Forum.

Package, availability and pricing
The LMH6881 single-channel PDA is available today in a 24-pin, 2.6-mm by 2.6-mm QFN package for US$3.71 in 1,000-unit quantities. The LMH6882 dual-channel PDA is available today in a 36-pin, 4.6-mm by 4.6-mm QFN package for US$5.95 in 1,000-unit quantities.

Learn more about TI's amplifier portfolio by visiting the links below:

• Order LMH6881 samples, SPICE models and EVMs: www.ti.com/lmh6881samples-pr. 
• Order LMH6882 samples, SPICE models and EVMs: www.ti.com/lmh6882samples-pr. 
• View a point-to-point microwave backhaul system block diagram: www.ti.com/microwavebh-pr.
• View a remote radio unit system block diagram: www.ti.com/remote-radio-pr.
• View a military radar/sonar system block diagram: www.ti.com/radar-sonar-pr.
• View an oscilloscope system block diagram: www.ti.com//oscilloscope-pr .
• View an ultrasound system block diagram: www.ti.com/ultrasound-pr.

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