700 MHz to 2.7 GHz

Quadrature Demodulator

ADL5382

Rev. 0

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FEATURES

Operating RF and LO frequency: 700 MHz to 2.7 GHz

Input IP3

33.5 dBm @ 900 MHz

30.5 dBm @1900 MHz

Input IP2: >70 dBm @ 900 MHz

Input P1dB: 14.7 dBm @ 900 MHz

Noise figure (NF)

14.0 dB @ 900 MHz

15.6 dB @ 1900 MHz

Voltage conversion gain: ~4 dB

Quadrature demodulation accuracy

Phase accuracy: ~0.2°

Amplitude balance: ~0.05 dB

Demodulation bandwidth: ~370 MHz

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

Single 5 V supply

APPLICATIONS

Cellular W-CDMA/CDMA/CDMA2000/GSM

Microwave point-to-(multi)point radios

Broadband wireless and WiMAX

FUNCTIONAL BLOCK DIAGRAM

BIAS

GEN

ADL5382

0°

90°

1

24

CMRF CMRF RFIP RFIN CMRF VPX

CML

VPA

COM

BIAS

VPL

VPL

VPL

VPB

VPB

QHI

QLO

IHI

ILO

LOIP LOIN CML

CML COM

23

22

21

20

19

7

8

9

10

11

12

2

3

4

5

6

18

17

16

15

14

13

Figure 1.

GENERAL DESCRIPTION

The ADL5382 is a broadband quadrature I-Q demodulator that

covers an RF input frequency range from 700 MHz to 2.7 GHz.

With a NF = 14 dB, IP1dB = 14.7 dBm, and IIP3 = 33.5 dBm at

900 MHz, the ADL5382 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 ~0.05 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 ~4 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

<−65 dBc. Differential dc offsets at the I and Q outputs are typically

<10 mV. Both of these factors contribute to the excellent IIP2

specifications which is >60 dBm.

The ADL5382 operates off a single 4.75 V to 5.25 V supply. The

supply current is adjustable with an external resistor from the

BIAS pin to ground.

The ADL5382 is fabricated using the Analog Devices, Inc.,

advanced Silicon-Germanium bipolar process and is available

in a 24-lead exposed paddle LFCSP.