AD8324
3.3 V上行电缆线路驱动器 3.3 V Upstream Cable Line Driver
Product Details
The is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8324 ideally suited for DOCSIS® 2.0 and EuroDOCSIS applications. The gain of the AD8324 is digitally controlled. An 8-bit serial word determines the desired output gain over a 59 dB range, resulting in gain changes of 1 dB/LSB.
The AD8324 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ω load through a 1:1 transformer.
Distortion performance of –54 dBc is achieved with an output level up to 61 dBmV at 65 MHz bandwidth. This device has a sleep mode function that reduces the quiescent current to 30 μA and a full power-down function that reduces power-down current to 2.5 mA.
The AD8324 is packaged in a low cost, 20-lead LFCSP and a 20-lead QSOP. The AD8324 operates from a single 3.3 V supply.
Applications
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- DOCSIS 2.0 and EuroDOCSIS cable modems
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- CATV set-top boxes
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- CATV telephony modems
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- Coaxial and twisted pair line drivers
### Features and Benefits
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- Supports DOCSIS 2.0 and EuroDOCSIS specifications for reverse path transmission systems
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- Gain programmable in 1 dB steps over a 59 dB range
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- Low distortion at 61 dBmV output
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- −59 dBc SFDR at 21 MHz
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- −54 dBc SFDR at 65 MHz
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- Output noise level at minimum gain 1.3 nV/√Hz
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- Maintains 75 Ω output impedance in transmit-enable and transmit-disable condition
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- Upper bandwidth of 100 MHz full gain range
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- 3.3 V supply operation
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- Supports SPI® interfaces