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ADL5375-05-EVALZ1

400 MHz to 6 GHz Broadband Quadrature Modulator

Analog Devices 

ADL5375

BASIC CONNECTIONS

IBBN

IBBP

VPOS

VPOS

S1

A

B

LOIP

C6

1000pF

C7

1000pF

C5

0.1µF

C3

1000pF

DSOP

1

COMM

2

LOIP

3

LOIN

4

COMM

5

NC 6

Z1

ADL5375

EXPOSED PADDLE

VPS1

18

COMM

17

16 RFOUT

15 NC

COMM

14

13 NC

C2

1000pF

C4

0.1µF

VPOS

C1

1000pF

RFOUT

GND

QBBN

QBBP

Figure 54. Basic Connections for the ADL5375

Figure 54 shows the basic connections for the ADL5375.

POWER SUPPLY AND GROUNDING

Pin VPS1 and Pin VPS2 should be connected to the same 5 V

source. Each pin should be decoupled with a 100 pF and

0.1 μF capacitor. These capacitors should be located as close

as possible to the device. The power supply can range between

4.75 V and 5.25 V.

The ten COMM pins should be tied to the same ground plane

through low impedance paths.

The exposed paddle on the underside of the package should also

be soldered to a ground plane with low thermal and electrical

impedance. If the ground plane spans multiple layers on the

circuit board, they should be stitched together with nine vias

under the exposed paddle as illustrated in the Evaluation Board

section. The AN-772 application note discusses the thermal and

electrical grounding of the LFCSP (QFN) package in detail.

BASEBAND INPUTS

The baseband inputs (IBBP, IBBN, QBBP, and QBBN) should be

driven from a differential source. The nominal drive level used

in the characterization of the ADL5375 is 1 V p-p differential

(or 500 mV p-p on each pin).

All the baseband inputs must be externally dc biased. The

recommended common-mode level is dependent on the

version of the ADL5375.

• ADL5375-05: 500 mV

• ADL5375-15: 1500 mV

LO INPUT

The LO input is designed to be driven from a single-ended

source. The LO source is ac-coupled through a series capacitor

to the LOIP pin while the LOIN pin is ac-coupled to ground

through a second capacitor.

The typical LO drive level, which was used for the

characterization of the ADL5375, is 0 dBm.

Differential operation is also possible, in which case both sides

of the differential LO source should be ac-coupled through a

pair of series capacitors to the LOIP and LOIN pins.

RF OUTPUT

The RF output is available at the RFOUT pin (Pin 16), which can

drive a 50 Ω load. The internal balun provides a low dc path to

ground. In most situations, the RFOUT pin must be ac-coupled

to the load.

Rev. 0 | Page 20 of 32

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