Overview
The AD8321AR from Analog Devices Inc. is a digitally controlled variable gain power amplifier designed for high-speed data transmission applications, particularly in cable TV (CATV) networks. This integrated circuit is packaged in a 20-lead SOIC and operates from a single +9 V supply. It is optimized for driving a 75 Ω load, such as coaxial cable, and is capable of maintaining a constant 75 Ω output impedance during power-up and power-down conditions, eliminating the need for external termination. The AD8321AR features a wide gain range of approximately 53 dB and is suitable for applications requiring low distortion and high common-mode rejection ratio (CMRR).
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 Level (Max) | RL = 75 Ω, f = 42 MHz | 11 | dBm | ||
| Supply Voltage | +9 | V | |||
| Package Type | 20-SOIC |
Key Features
- Digitally controlled variable gain with a range of approximately 53 dB.
- Low distortion and high common-mode rejection ratio (CMRR) for clean signal transmission.
- High-speed data transmission capabilities, suitable for frequencies from 5 MHz to 65 MHz.
- Operates from a single +9 V supply and maintains a constant 75 Ω output impedance during power-up and power-down conditions.
- Small size and low power consumption, packaged in a 20-lead SOIC.
- Suitable for surface-mounting).
Applications
- Cable TV (CATV) networks and high-speed data modems.
- Interactive CATV set-top boxes).
- CATV plant test equipment).
- Data acquisition systems).
- Industrial automation applications).
- Telecommunications equipment).
- Medical device systems).
- Automotive electronics).
Q & A
- What is the primary function of the AD8321AR?
The AD8321AR is a digitally controlled variable gain power amplifier designed for high-speed data transmission applications, particularly in CATV networks.
- What is the gain range of the AD8321AR?
The gain range of the AD8321AR is approximately 53 dB.
- What is the typical supply voltage for the AD8321AR?
The AD8321AR operates from a single +9 V supply.
- What type of package does the AD8321AR come in?
The AD8321AR is packaged in a 20-lead SOIC.
- What are the key applications of the AD8321AR?
The AD8321AR is used in CATV networks, high-speed data modems, interactive CATV set-top boxes, CATV plant test equipment, and other applications requiring low distortion and high CMRR.
- How does the AD8321AR maintain output impedance during power-up and power-down?
The AD8321AR maintains a constant 75 Ω output impedance during power-up and power-down conditions, eliminating the need for external termination.
- What is the maximum output level of the AD8321AR?
The maximum output level of the AD8321AR is up to 11 dBm at 42 MHz bandwidth.
- Is the AD8321AR suitable for surface-mounting?
Yes, the AD8321AR is suitable for surface-mounting.
- What are the benefits of the AD8321AR in terms of power consumption and size?
The AD8321AR offers low power consumption and a small size, making it energy-efficient and ideal for space-constrained applications.
- How is the gain of the AD8321AR controlled?
The gain of the AD8321AR is controlled by a three-wire SPI-compatible interface using an 8-bit attenuator word.
