400 MHz to 6 GHz

Quadrature Demodulator

ADL5380

Rev. 0

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FEATURES

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

Noise figure (NF)

10.9 dB @ 900 MHz

11.7 dB @ 1900 MHz

Voltage conversion gain: ~7 dB

Quadrature demodulation accuracy @ 900 MHz

Phase accuracy: ~0.2°

Amplitude balance: ~0.07 dB

Demodulation bandwidth: ~390 MHz

Baseband I/Q drive: 2 V p-p into 200 Ω

Single 5 V supply

APPLICATIONS

Cellular W-CDMA/GSM/LTE

Microwave point-to-(multi)point radios

Broadband wireless and WiMAX

FUNCTIONAL BLOCK DIAGRAM

RFIN

RFIP

ENBL

ADJ

QUADRATURE

PHASE SPLITTER

ADL5380

V2I

BIAS

LOIP

LOIN

IHI

ILO

QHI

QLO

Figure 1.

GENERAL DESCRIPTION

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 V p-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

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.