ADL5566ACPZ-R7 datasheet(19/24 Pages) AD

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Data Sheet

ADL5566

Rev. C | Page 19 of 24

DC-COUPLED RECEIVER APPLICATION

The ADL5566 is well suited for dc-coupled applications, such

as zero-IF direct conversion receivers. An example receiver

configuration is shown in Figure 48, consisting of the ADL5380

quadrature demodulator and the ADL5566 dual differential

amplifier. This is an ideal combination because of the wide RF

input bandwidth from 400 MHz to 6 GHz, the high linearity of the

ADL5566, and when operating on a 5 V supply, level shifting to

align the common-mode voltage is not required.

The interface between the ADL5380 and the ADL5566 is

straight forward because the impedance presented by the

ADL5566 is sufficiently high enough to permit directly

connecting the two devices without any degradation in

performance. When using the ADL5566 as shown in Figure 48,

the OIP3s at the outputs are improved due to the high OIP3 of

the amplifier pair (see Table 6). In a real-world receiver where

blockers are present, it is advantageous to insert a low-pass

filter between the ADL5380 and the ADL5566 to remove

these undesired signals.

If the ADL5566 is followed by an ADC, insert an antialiasing

filter between the ADL5566 and the ADC to prevent broadband

noise from aliasing back in band. For more information on this

interface, see the ADC Interfacing section.

The cascade of the performance of the circuit shown in Figure 48 is

presented in Table 6.

LOIN

ILO

QLO

RFIN

0.1µF

100pF

GND3

GND1

GND3

RFIP

0°

90°

IHI

LOIP

QHI

ENBL

0.1µF

100pF

0.1µF

100pF

1.5kΩ

100pF

TC1-1-13

0Ω

TC1-1-13

100pF

0.01µF

BALANCED

LOAD

VIP1

VIN1

0.01µF

VON1

VCOM1

VOP1

0.01µF

VCC2

ENBL1

ENBL2

VCC

VCC1

ADL5566

0.01µF

BALANCED

LOAD

VIP2

VIN2

0.01µF

VON2

VCOM2

VOP2

0.01µF

GND3

0.01µF

10µF

VCC

0.01µF

5.1nH

Figure 48. DC-Coupled Interface Example Featuring the ADL5380

Table 6. Cascade Performance of the ADL5380 and ADL5566

IF Frequency = 200 MHz, RL = 200 Ω, VOUT = 2 V p-p Composite

Frequency (MHz)

HD2 (dBc)

HD3 (dBc)

OIP3 (dBm)

ADL5380 OIP3 (dBm)1

OIP2 (dBm)

Voltage Gain (dB)

Power Gain (dB)

900

−79.3

−84.2

44.9

26.2

91.8

18.1

12.0

1900

−82.2

−80.5

40.8

26.5

83.9

18.1

12.0

2700

−80.7

−73.9

39.6

25.7

75.6

18.1

12.0

1 Output referred IP3 of the ADL5380, PIN = −14 dBm, and RL = 200 Ω.

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