LT5546 40MHz to 500MHz VGA and I/Q Demodulator with 17MHz Baseband Bandwidth
The LT®5546 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 downconverting 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 rolloff. 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
产品特点 Features
- 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
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应用
- GPS IF Receivers
- Satellite IF Receivers
- VHF/UHF Receivers
- Wireless Local Loop
典型应用图
参数
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LT5546 订购信息和价格参考Package Variations and Pricing
| 器件型号 |
封装 |
引脚 |
温度 |
价格 (以 1 ~ 99 片为批量) |
价格 (以 1000 片为批量) * |
| LT5546EUF |
QFN |
16 |
E |
$4.73 |
$3.35 |
| LT5546EUF#PBF |
QFN |
16 |
E |
$4.73 |
$3.35 |
| LT5546EUF#TR |
QFN |
16 |
E |
|
$3.45 |
| LT5546EUF#TRPBF |
QFN |
16 |
E |
|
$3.45 |
LT5546 数据手册及相关资料下载
- 数据手册 (英文) : LT5546 - 40MHz to 500MHz VGA and I/Q Demodulator with 17MHz Baseband Bandwidth.PDF
- 可靠性数据 : R409 Reliability Data .PDF
