Overview
The AD8328ARQ, produced by Analog Devices Inc., is a low-cost amplifier specifically designed for coaxial line driving in cable television (CATV) and Data Over Cable Service Interface Specification (DOCSIS) applications. This component is ideal for use in DOCSIS and EuroDOCSIS-certified cable modems, CATV set-top boxes, and CATV telephony modems. The AD8328 operates from a single 5 V supply and is packaged in a 20-lead QSOP or 20-lead LFCSP, making it a compact and efficient solution for various cable transmission systems.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 5 V |
| Output Impedance | 300 Ω (Tx-enable and Tx-disable condition) |
| Upper Bandwidth | 107 MHz (full gain range) |
| Gain Range | −28 dB to +31 dB (59 dB total range, 1 dB/LSB) |
| Input Impedance (Single-ended) | 800 Ω |
| Input Impedance (Differential) | 1.6 kΩ |
| Output Noise Level @ Minimum Gain | 1.2 nV/√Hz |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 20-lead QSOP or 20-lead LFCSP |
Key Features
- Digitally controlled gain with an 8-bit serial interface, allowing for precise gain adjustments in 1 dB steps over a 59 dB range.
- Low distortion performance, with a Spurious Free Dynamic Range (SFDR) of −57.5 dBc at 21 MHz and −54 dBc at 65 MHz.
- Supports SPI interfaces for easy integration into digital systems.
- Low power sleep mode, reducing supply current to 20 μA when the device is powered down.
- Supply current scaling with gain code, reducing power consumption at lower gain settings.
Applications
- DOCSIS and EuroDOCSIS-certified cable modems.
- CATV set-top boxes.
- CATV telephony modems.
- Coaxial and twisted pair line drivers.
Q & A
- What is the primary application of the AD8328ARQ?
The AD8328ARQ is primarily used as a power amplifier in DOCSIS and EuroDOCSIS-certified cable modems and CATV set-top boxes.
- What is the gain range of the AD8328ARQ?
The gain range of the AD8328ARQ is from −28 dB to +31 dB, with a total range of 59 dB and adjustments in 1 dB steps.
- What is the output impedance of the AD8328ARQ?
The output impedance of the AD8328ARQ is 300 Ω in both Tx-enable and Tx-disable conditions.
- What is the upper bandwidth of the AD8328ARQ?
The upper bandwidth of the AD8328ARQ is 107 MHz over the full gain range.
- How is the gain controlled in the AD8328ARQ?
The gain is controlled through an 8-bit serial interface, allowing for digital control over the gain settings.
- What is the power consumption in sleep mode?
In sleep mode, the supply current is reduced to 20 μA.
- What are the package options for the AD8328ARQ?
The AD8328ARQ is available in 20-lead QSOP and 20-lead LFCSP packages.
- What is the operating temperature range of the AD8328ARQ?
The operating temperature range is from −40°C to +85°C.
- Does the AD8328ARQ support SPI interfaces?
Yes, the AD8328ARQ supports SPI interfaces for easy integration into digital systems.
- What is the output noise level at minimum gain?
The output noise level at minimum gain is 1.2 nV/√Hz.
