ADL5380 Datasheet

• Operating RF and LO frequency: 400 MHz to
  6 GHz
• Input IP3
  30 dBm @ 900 MHz
  28 dBm @1900 MHz
• Input IP2: >65 dBm @ 900 MHz
• Input P1dB (IP1dB): 11.6 dBm @ 900 MHz
• Voltage conversion gain: ~7 dB
• Demodulation bandwidth: ~390 MHz
• Noise figure (NF)
  10.9 dB @ 900 MHz
  11.7 dB @ 1900 MHz
• Quadrature demodulation accuracy @
  900 MHz
  Phase accuracy: ~0.2°
  Amplitude balance: ~0.07 dB
• Baseband I/Q drive: 2 Vp-p into 200 Ω
• Single 5 V supply

• Cellular W-CDMA/GSM/LTE
• Microwave point-to-(multi)point radios
• Broadband wireless and WiMAX

The ADL5380 is a broadband quadrature I-Q demodulator that covers an RF/IF input frequency range from 400 MHz to 6 GHz. With a NF = 10.9 dB, IP1dB = 11.6 dBm, and IIP3 = 29.7 dBm @ 900 MHz, the ADL5380 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance.

Excellent demodulation accuracy is achieved with amplitude and phase balances of ~0.07 dB and ~0.2°, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of ~7 dB. The buffered baseband outputs are capable of driving a 2 Vp-p differential signal into 200 Ω.

The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is <−50 dBm. Differential dc offsets at the I and Q outputs are typically <20 mV. Both of these factors contribute to the excellent IIP2 specification, which is >65 dBm.

The ADL5380 operates off a single 4.75 V to 5.25 V supply. The supply current is adjustable by placing an external resistor from the ADJ pin to either the positive supply, V_S, (to increase supply current and improve IIP3) or to ground (which decreases supply current at the expense of IIP3).

The ADL5380 is fabricated using the Analog Devices, Inc., advanced silicon-germanium bipolar process and is available in a 24-lead exposed paddle LFCSP.