Features and Benefits
- 17MHz I/Q Lowpass Output Noise Filters
- Wide Range 1.8V to 5.25V Supply Voltage
- Frequency Range: 40MHz to 500MHz
- THD < 0.14% (–57dBc) at 800mVP-P Differential Output Level
- IF Overload Detector
- Log Linear Gain Control Range: –7dB to 56dB
- Baseband I/Q Amplitude Imbalance: 0.2dB
- Baseband I/Q Phase Imbalance: 0.6°
- 7.8dB Noise Figure at Max Gain
- Input IP3 at Low Gain: –1dBm
- Low Supply Current: 24mA
- Low Delay Shift Over Gain Control Range: 2ps/dB
- Outputs Biased Up While in Standby
- 16-Lead QFN 4mm × 4mm Package with Exposed Pad
The LT5546 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA) and 17MHz I/Q baseband bandwidth designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature down-converting mixers and 17MHz lowpass noise filters (LPF). The LO port consists of a divide-by-two stage and LO buffers. The IC provides all building blocks for IF down-conversion to I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The VGA gain has a linear-in-dB relationship to the control input voltage. Hard-clipping amplifiers at the mixer outputs reduce the recovery time from a signal overload condition. The lowpass filters reduce the out-of-band noise and spurious frequency components. The –3dB corner frequency of the noise filters is approximately 17MHz and has a first order roll-off. The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip.
- GPS IF Receivers
- Satellite IF Receivers
- VHF/UHF Receivers
- Wireless Local Loop
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Tools & Simulations
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.