High-Performance RF VVA Features 46dB of Linearly Controlled Dynamic Range and Excellent Attenuation Flatness
The MAX19794 dual general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50Ω systems operating in the 10MHz to 500MHz frequency range. This device includes a patented control circuit that provides 22.4dB of attenuation range (per attenuator) with a typical linear control slope of 8dB/V. Both attenuators share a common analog control. They can be cascaded together to yield 44.7dB of total attenuation range with a typical combined linear control slope of 16dB/V (5V operation). Alternatively, the on-chip, 4-wire SPI-controlled 10-bit DAC can be used to control both attenuators. In addition, a step-up/down feature allows user-programmable attenuator stepping through command pulses without re-programming the SPI interface. The MAX19794 is a monolithic device designed using one of Maxim's proprietary SiGe BiCMOS processes. The part operates from a single +5V supply or alternatively operates from a single +3.3V supply. It is available in a compact 36-pin TQFN package (6mm x 6mm x 0.8mm) with an exposed pad. Electrical performance is guaranteed over the -40°C to +100°C extended temperature range.
title | Download file |
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MAX19794 Data Sheet | MAX19794.pdf |
Part Number | Gain Cntl. | Channels | RF Freq. (MHz) | RF Freq. (MHz) | Analog Attenuation Range | Digital Attenuation Range (dB) | Gain (dB) | HD2 (dBc) | HD3 (dBc) | VCC (V) | ISUPPLY (mA) | Footprint (mm x mm) | Package/Pins | Oper. Temp. (°C) |
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min | max | max | ||||||||||||
MAX19794 | Analog + Digital | 1 2 | 10 | 500 | 44.7 | 44.7 | -3 | -63 | -97 | 3.15 to 3.45 4.75 to 5.25 | 13 | 6.0 x 6.0 | TQFN/36 | -40 to +100 |
Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
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MAX19794ETX+ | Active | MAX19791ETX+ | TQFN,;36 pin;37.2 mm² | -40°C to +85°C | Lead Free |
MAX19794ETX+T | Active | MAX19791ETX+T | TQFN,;36 pin;37.2 mm² | -40°C to +85°C | Lead Free |
MAX19794EVKIT# | No Longer Available | MAX19791EVKIT# | EVKIT; | -40°C to +85°C | See data sheet |