600 MHz, 45 dB Digitally Controlled Variable Gain Amplifier
The AD8369 is a high performance, digitally controlled variable gain amplifier, designed to be used at IF frequencies within cellular receivers.
The device features a 4-bit digitally controlled gain control interface configurable for either parallel or 3 wire serial control. The gain control range spans 45 dB adjustable in 3 dB increments.
The AD8369 is ideally suited to be used in digital IF receivers and is fully specified for operation at common IF frequencies 70 / 140 / 190 / 240 / 380 MHz. The gain stability and flatness is below 0.1 dB over a 20 MHz channel bandwidth at 380 MHz. Coupled with the low distortion and the ability to drive 200 Ω or 1 KΩ, the AD8369 allows optimal placement and flexibility as a high IF gain control element.
The AD8369 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 –40ºC to +85ºC temperature range.
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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.
AD8369-EVALZ is a fully populated, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all features of the AD8369 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 or parallel interface. There are several switches on the eval board. SW3 is used to switch between serial and parallel programming mode. SW1 is used to enable or disable the latch function in SPI mode or the data write function in parallel mode. SW4 is a rotary switch which can be used to set the bit code in parallel mode. SW2 is used to apply or disable +5 V to the AD8369. This evaluation board requires only a single supply within the range of 4.5 V to 5.5 V.