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Product Detailed Parameters
- Description：IC VIDEO LINE DRVR/TRANS 20QSOP
- Mfr：Analog Devices Inc.
- Package：Tube,Tube
- Series：-
- Type：Line Driver, Transmitter
- Protocol：-
- Number of Drivers/Receivers：-
- Duplex：-
- Data Rate：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：20-QSOP
- Receiver Hysteresis：-
- Grade：-
- Qualification：-
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Overview
The AD8328ARQZ is a 5 V upstream cable line driver designed for DOCSIS and EuroDOCSIS reverse path transmission systems. It features digitally programmable gain over a 59 dB range with 1 dB steps via an SPI interface. The device supports differential or single-ended inputs and maintains a 300 Ω output impedance. Key electrical parameters include a bandwidth of 107 MHz, an output noise level of 1.2 nV/√Hz at minimum gain, and distortion performance of −57.5 dBc SFDR at 21 MHz and −54 dBc at 65 MHz.
Feature Summary
- Digitally programmable gain control with 1 dB resolution over a 59 dB range
- Low distortion performance suitable for high-fidelity cable modem applications
- Integrated sleep mode reducing quiescent current to 20 μA
- Maintains 300 Ω output impedance during transmit enable and disable states
Applications
- DOCSIS and EuroDOCSIS cable modems
- CATV set-top boxes
- CATV telephony modems
- Coaxial and twisted pair line drivers
Procurement Notes
Verify the specific package type, as the AD8328 is available in both 20-lead LFCSP and QSOP formats. Confirm that the ordering suffix corresponds to the required thermal and mechanical specifications. Ensure compatibility with the intended serial peripheral interface logic levels. Check for any obsolete status notifications from Analog Devices regarding this component.
Selection Notes
Select the AD8328 for applications requiring precise digital gain control in upstream cable paths. It is optimized for driving 75 Ω loads through a 2:1 transformer. Consider the power consumption differences between active and sleep modes. Ensure the input signal source can provide the necessary differential or single-ended drive capability within the specified impedance constraints.
Part Context
This component belongs to the Analog Devices lineup of RF and microwave integrated circuits. It is specifically engineered for the cable television and broadband access market. The device integrates linear amplification with digital control logic on a single chip, simplifying the design of compliant upstream transmission systems.
Replacement Considerations
No public confirmed substitutes are listed in the provided documentation. Verify if newer revisions or alternative packages from the same manufacturer are available for direct pin-compatible replacement.
FAQ
How is the gain of the AD8328 controlled?
The gain is controlled via an SPI interface using three digital data lines: CLK, DATEN, and SDATA. An 8-bit serial word determines the desired output gain.
What is the purpose of the TXEN pin?
The TXEN pin places the device into between-burst mode. A Logic 0 disables forward transmission and reduces supply current, while a Logic 1 enables it.
Can the AD8328 accept single-ended inputs?
Yes, the AD8328 accepts either differential or single-ended input signals. The differential input impedance is approximately 1.6 kΩ, while the single-ended input is 800 Ω.
