Overview
The AD8345AREZ is a silicon RFIC quadrature modulator designed by Analog Devices Inc. for operation in the frequency range of 140 MHz to 1000 MHz. This device is optimized for high-performance direct modulation of an IF carrier, featuring excellent phase accuracy and amplitude balance. It splits the external LO signal into two quadrature components using a polyphase phase splitter network and mixes these with the baseband I and Q differential input signals. The outputs are then combined to provide a single-ended 50 Ω drive at the output stage.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Operating Frequency | 140 MHz to 1000 MHz | |
| Output P1dB | 2.5 dBm typical | VS = 5V, LO = -2dBm at 800MHz |
| Noise Floor | -155 dBm/Hz typical | VS = 5V, LO = -2dBm at 800MHz |
| Quadrature Error | 0.5 degree RMS typical | CDMA IS95 setup |
| I/Q Amplitude Balance | 0.2 dB typical | CDMA IS95 setup |
| Supply Voltage | 2.7V to 5.5V | |
| Package Style | 16-lead TSSOP_EP | |
| Operating Temperature | -40°C to +85°C | |
| Bandwidth (3dB) | 80 MHz typical | VS = 5V, LO = -2dBm at 800MHz |
| Output Return Loss (S22) | -20 dB typical | VS = 5V, LO = -2dBm at 800MHz |
Key Features
- Excellent phase accuracy and amplitude balance for high-performance direct modulation.
- Single supply operation from 2.7V to 5.5V.
- Pin-compatible with AD8346 and AD8349.
- 16-lead TSSOP_EP package.
- Operating temperature range of -40°C to +85°C.
- Differential LO drive for maximum LO suppression at the output.
- Enable pin for quick turn-on and turn-off (2.5 μs and 1.5 μs respectively).
Applications
- Cellular communication systems (GSM, PCS, W-CDMA, CDMA, ISM).
- Fixed broadband access systems (LMDS/MMDS).
- Wireless LAN and wireless local loop systems.
- Digital TV and CATV modulators.
- Single sideband upconverters.
- Hybrid phase-locked loops with direct digital synthesizers.
Q & A
- What is the operating frequency range of the AD8345AREZ?
The AD8345AREZ operates from 140 MHz to 1000 MHz.
- What is the typical output P1dB of the AD8345AREZ?
The typical output P1dB is 2.5 dBm at VS = 5V and LO = -2dBm at 800MHz.
- What is the noise floor of the AD8345AREZ?
The noise floor is typically -155 dBm/Hz at VS = 5V and LO = -2dBm at 800MHz.
- What is the quadrature error of the AD8345AREZ?
The quadrature error is 0.5 degree RMS typical in CDMA IS95 setup.
- What is the I/Q amplitude balance of the AD8345AREZ?
The I/Q amplitude balance is 0.2 dB typical in CDMA IS95 setup.
- What is the supply voltage range for the AD8345AREZ?
The supply voltage range is from 2.7V to 5.5V.
- What package style is the AD8345AREZ available in?
The AD8345AREZ is available in a 16-lead TSSOP_EP package.
- What is the operating temperature range of the AD8345AREZ?
The operating temperature range is -40°C to +85°C.
- What are some common applications of the AD8345AREZ?
Common applications include cellular communication systems, fixed broadband access systems, wireless LAN, wireless local loop, digital TV/CATV modulators, and single sideband upconverters.
- How does the enable pin function on the AD8345AREZ?
The enable pin allows for quick turn-on (2.5 μs) and turn-off (1.5 μs) of the device.
