ディジタル利得設定可能な、初の低歪みIF差動ADCドライバ
SUNNYVALE, CA-June 24, 2003-Maxim Integrated Products
NASDAQ: MXIM) introduces the MAX2055, the industry's first digitally controlled variable-gain amplifier with a differential output to drive high-performance, high-speed analog-to-digital converters (ADCs). The MAX2055 is optimized to deliver IF frequencies from 30MHz to 300MHz. It is ideal for GSM, DCS/PCS, EDGE, iDEN, PHS, cdma2000™, and WB-CDMA multicarrier/single carrier base-station applications where high linearity and low noise are required for good bit-error-rate performance.
The highly integrated MAX2055 delivers 23dB of gain range with ±0.2dB accuracy over the full temperature range. Industry-leading OIP3 performance is 40dBm over the -3dB to +20dB gain range. When using this device to drive ADCs, the OIP3 reduces in-band intermodulation noise below that found on most 12- to 16-bit ADCs. This device integrates a high-performance, digitally switched attenuator that boasts -12dB of return loss and stable gain performance over temperature. The on-board fixed-gain amplifier delivers a low 6dB noise figure, placing the noise level of the MAX2055 significantly below that of most high-performance 14-bit ADCs. Overall board space used by the DVGA is 50% less than comparable discrete solutions. With robust reliability and performance that only silicon-based processes (SiGe) deliver, the MAX2055 beats today's very best GaAs solutions and X-Amp based products.
When used in radio receivers, the MAX2055 interfaces to a high-speed ADC with AC-coupled inputs or directly drives a transformer to perform impedance matching. It has as fixed 50Ω matched-output impedance that remains stable over the entire 30MHz to 300MHz operating frequency range.
The MAX2055 is available in a compact, 20-pin TSSOP package. Prices start at $4.95 (1000-up, FOB USA).
cdma2000 is a trademark of Telecom Industry Association.
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