ADL5519ACPZ-R7 datasheet(14/27 Pages) AD

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ADL5519

Preliminary Technical Data

Rev. PrB | Page 14 of 27

USING THE ADL5519

BASIC CONNECTIONS

The ADL5519 is specified for operation up to 10 GHz; as a

result, low impedance supply pins with adequate isolation

between functions are essential. A power supply voltage of

between 3.0 V and 5.5 V should be applied to VPSA, VPSB,

and VPSR. Power supply decoupling capacitors of 100 pF

and 0.1 μF should be connected close to these power

supply pins.

ADL5519ACPZ

EXPOSED PADDLE

CLPA

TEMP

VPSR

ADJA

CLPB

VLVL

VREF

ADJB

VPSB

VSTA

VSTB

OUTB

FBKB

OUTN

OUTP

FBKA

OUTA

VPSA

INHB

INLB

COMR

PWDN

INLA

INHA

COMR COMR

COMR

INHA

47nF

VPSB

C11

100pF

C16

0.1

μF

R11

R10

DIFF OUT +

DIFF OUT –

100pF

C15

0.1

μF

VPSA

100pF

C12

0.1

μF

VPSR

SEE

TEXT

52.3

INHB

47nF

52.3

47nF

R12

SETPOINT

VOLTAGE B

OUTPUT

VOLTAGE B

R20

SETPOINT

VOLTAGE B

OUTPUT

VOLTAGE B

R21

SEE

TEXT

SEE

TEXT

SEE

TEXT

SEE

TEXT

Figure 11. Basic Connections

The paddle of the LFCSP_VD package is internally

connected to COMR. For optimum thermal and electrical

performance, the paddle should be soldered to a low

impedance ground plane.

INPUT SIGNAL COUPLING

The RF inputs (INHA and INHB) are single-ended and

must be ac-coupled. INLA and INLB (input common)

should be ac-coupled to ground. Suggested coupling

capacitors are 47 nF ceramic 0402-style capacitors for input

frequencies of 1 MHz to 10 GHz. The coupling capacitors

should be mounted close to the INHA[INHB] and

INLA[INLB} pins. The coupling capacitor values can be

increased to lower the input stage’s high-pass cutoff

frequency. The high-pass corner is set by the input coupling

capacitors and the internal 10 pF high-pass capacitor. The

dc voltage on INHA[INHB] and INLA[INLB] is about one

diode voltage drop below the supply voltage.

VPSA

A = 9dB

18.7k

CURRENT

STAGE

INLA

INHA

OFFSET

COMP

5pF

FIRST

GAIN

STAGE

Figure 12. Single Channel Input Interface

While the input can be reactively matched, in general this is not

necessary. An external 52.3 Ω shunt resistor (connected on the

signal side of the input coupling capacitors, as shown in

Figure 11) combines with the relatively high input impedance

to give an adequate broadband 50 Ω match.

The coupling time constant, 50 × CC/2, forms a high-pass

corner with a 3 dB attenuation at fHP = 1/(2π × 50 × CC ), where

C1 = C2 = CC. Using the typical value of 47 nF, this high pass

corner will be ~68 kHz. In high frequency applications, fHP

should be as large as possible to minimize the coupling of

unwanted low frequency signals. In low frequency applications,

a simple RC network forming a low-pass filter should be added

at the input for similar reasons. This should generally be placed

at the generator side of the coupling capacitors, thereby

lowering the required capacitance value for a given high-pass

corner frequency.

TEMPERATURE SENSOR INTERFACE

The ADL5519 provides a temperature sensor output capable of

driving about 1.6 mA. The temperature scaling factor of the

output voltage is approximately 2 mV/°C. The typical absolute

voltage at 25°C is ~620 mV.

TEMP

VPSR

INTERNAL

VPTAT

12k

COMR

Figure 13. TEMP Interface Simplified Schematic

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