COST-CUTTING INSTRUMENT AMP DELIVERS HIGH ACCURACY
The LTC6800 3-V instrumentation amplifier guarantees an offset voltage below 100 µV with an offset drift of just 0.25 µV/°C. This value of offset drift is nearly an order of magnitude better than some comparably priced instrument amplifiers. Meanwhile, at $1.55 each per 1000, Linear Technology's LTC6800 costs half as much as the LTC2053, an instrument amp with a mere 50-nV/°C offset drift.
Another distinguishing feature of the LTC6800 is its 116-dB common-mode rejection ratio (CMRR). Unlike some instrument amplifiers, this device's CMRR doesn't degrade at low gain settings. The amplifier also features rail-to-rail operation on both the input and output. Operating from a 2.7 to 5.5-V supply, the LTC6800 draws less than 1.8 mA and is guaranteed functional from -40°C to 125°C. Housed in an eight-pin MSOP, the device can provide a transducer interface in bridge circuits.
Linear Technology Corp.
SPEEDY ADC CHIPS AWAY AT POWER, PRICE, AND SIZE
The AD9245 analog-to-digital converter (ADC) from Analog Devices offers the 14-bit, 80-Msample/s performance of the AD6645 at a lower cost and lower power dissipation in a smaller package. Introduced two years ago, the AD6645 is a 5-V device fabricated in the company's extra-fast complimentary bipolar (XFCB) process. The new ADC migrates this converter design into a 3-V bulk CMOS process.
By moving to the mainstream process, the company lowered the converter's power dissipation from 1.5 W in the AD6645 to under 500 mW in the AD9245. At the same time, packaging was shrunk from the original 52-lead LQFP to a 5- by 5-mm CSP. Pricing for 1000 pieces fell from $54 to just $38 for the new ADC. Other specifications include an signal-to-noise ratio of 72 dB and an SFDR of 85 dBc. Samples are available now with production expected in April.
Analog Devices Inc.