750 MHz Digitally Controlled Variable Gain Amplifier
The AD8370 is a high performance, digitally controlled variable gain amplifier, designed to be used at IF frequencies within communication infrastructure equipment.
The part provides two gain control ranges that are controlled through a three wire digital interface, and allow the user to attain fine gain control for maximum receiver sensitivity.
The AD8370 has been fully specified for operation at common wireless IF frequencies 70 / 140 / 190 / 240 / 380MHz. The high output compression and fine gain control adjustability makes the AD8370 an ideal choice for to be used within digital receiver AGC circuits for GSM / CDMA2000 / W-CDMA cellular base stations.
The AD8370 is fabricated on an advanced silicon bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 16-lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature range.Availability
Samples AD8370ARU and an evaluation boards AD8370-EVAL are available.
Other Wireless VGA products:
AD8367 - 45dB, 500MHz Single Ended, Analog Controlled VGA
AD8369 – 45dB, 600MHz Differential, 3dB Step Digitally Controlled VGA
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
AD8370-EVALZ is a fully populated, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all features of the AD8370 DVGA. The evaluation board contains bypassable transformers to allow single ended or differential inputs, and a 25 pin D-Sub connector for external digital control of the on chip SPI port. There is a single switch on this eval board which can be used to turn on and off the +5 V applied to the power pins. This evaluation board requires only a single supply within the range of 4.5 V to 5.5 V.