Overview
The AD8321AR-REEL, produced by Analog Devices Inc., is a low-cost, digitally controlled variable gain amplifier. It is optimized for coaxial line driving applications, particularly in cable television (CATV) and high-speed data modem systems. The device operates from a single +9 V supply and is packaged in a 20-lead SOIC (Small Outline Integrated Circuit) package. It features a linear-in-dB gain response over a range of more than 53 dB, making it suitable for various signal processing tasks.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Gain Range | 52.4 | 53.4 | 54.4 | dB | |
| Maximum Gain | 25.25 | 26 | 26.75 | dB | |
| Minimum Gain | -28.15 | dB | |||
| Input Resistance (Single-Ended) | 820 | Ω | |||
| Input Resistance (Differential) | 900 | Ω | |||
| Input Capacitance | 2.0 | pF | |||
| Output Power (Max Gain, f = 42 MHz) | VIN = 0.137 V p-p, RL = 75 Ω | 11 | dBm | ||
| Noise Figure (Max Gain, f = 10 MHz) | 15 | dB | |||
| Operating Temperature | -40 | 85 | °C |
Key Features
- Digitally controlled variable gain with a range of more than 53 dB and a step resolution of 0.7526 dB.
- Linear-in-dB gain response.
- Capable of driving a 75 Ω load, such as coaxial cable, with low distortion.
- Operates from a single +9 V supply.
- Low cost and compact 20-lead SOIC package.
- Programmable via a three-wire SPI-compatible interface (SDATA, DATEN, CLK).
- High signal integrity with -53 dBc SFDR at 42 MHz.
- Maintains constant 75 Ω output impedance during power-up and power-down conditions.
Applications
- CATV line drivers.
- High-speed data modems.
- Interactive CATV set-top boxes.
- CATV plant test equipment.
- General-purpose IF variable gain blocks.
Q & A
- What is the AD8321AR-REEL used for? The AD8321AR-REEL is used as a digitally controlled variable gain amplifier, particularly in CATV and high-speed data modem applications.
- What is the gain range of the AD8321AR-REEL? The gain range is more than 53 dB.
- How is the gain controlled in the AD8321AR-REEL? The gain is controlled via a three-wire SPI-compatible interface (SDATA, DATEN, CLK).
- What is the output impedance of the AD8321AR-REEL? The output impedance is 75 Ω.
- What is the maximum output power of the AD8321AR-REEL? The maximum output power is up to 11 dBm at 42 MHz.
- What is the noise figure of the AD8321AR-REEL at maximum gain? The noise figure is 15 dB at 10 MHz.
- What type of package does the AD8321AR-REEL come in? It comes in a 20-lead SOIC package.
- What is the operating temperature range of the AD8321AR-REEL? The operating temperature range is -40°C to +85°C.
- Does the AD8321AR-REEL require external 75 Ω termination? No, it maintains a constant 75 Ω output impedance during power-up and power-down conditions, eliminating the need for external termination.
- What are some common applications of the AD8321AR-REEL? Common applications include CATV line drivers, high-speed data modems, interactive CATV set-top boxes, and CATV plant test equipment.
