HDMP-1526 datasheet(13/14 Pages) HP

13 / 14 page

694

Transceiver Package

Information

The HDMP-1526 is constructed

of a single integrated circuit

packaged in a 14x14 mm

EDQuad package. This package

was designed to provide

enhanced power dissipation, thus

allowing for smaller package

dimensions. The package

conforms to the industry standard

JEDEC land pattern for 14x14

mm devices. As shown in Figure

12, the die is attached to a

copper heatsink using thermally

conductive epoxy. This allows for

the power dissipated by the IC to

be directly connected to the

ambient environment, thereby

minimizing the

Θjc of the device.

Figure 12. Power Supply Bypass.

RXCAP0

VCC_RXTTL

TOP VIEW

GND_RXTTL

GND_TXTTL

VCC_TXTTL

GND_TXTTL

GND_TXA

TXCAP0

* SUPPLY VOLTAGE INTO VCC_RXA AND VCC_TXA SHOULD

BE FROM A LOW NOISE SOURCE. ALL BYPASS CAPACITORS

ARE 0.1 µF. THE PLL FILTER CAPACITORS ARE 0.01 µF.

VCC

VCC*

VCC

GND_RXTTL

VCC

CPLLT

VCC*

VCC

CPLLR

Transceiver Power

Supply Bypass and Loop

Filter Capacitors

Bypass capacitors should be

liberally used and placed as close

as possible to the appropriate

power supply pins of the HDMP-

1526 as shown on the schematic

of Figure 11. All bypass chip

capacitors are 0.1

µF. The

VCC_RXA and VCC_TXA pins are

the analog power supply pins for

the PLL sections. The voltage into

these pins should be clean with

minimum noise. The PLL loop

filter capacitors and their pin

locations are also shown on

Figure 11. Notice that only two

capacitors are required: CPLLT for

the transmitter and CPLLR for the

receiver. Nominal capacitance is

0.01

µF. The voltage across the

capacitors is on the order of 1

volt, so the capacitor can be a

low voltage type and physically

small. The PLL capacitors are

placed physically close to the

appropriate pins on the HDMP-

1526. Keeping the lines short will

prevent them from picking up

stray noise from surrounding

lines or components.

COPPER HEATSINK

NICKEL PLATING

CERAMIC

LEAD

DIE

WIRE BOND

Figure 13. Package Cross Section of HDMP-1526.

HDMP-1526 Datasheet(PDF) 13 Page - Agilent(Hewlett-Packard)

HDMP-1526 Datasheet(HTML) 13 Page - Agilent(Hewlett-Packard)

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