ADN2843 datasheet(10/12 Pages) AD

10 / 12 page

REV. 0

–10–

ADN2843

Figure 5. Recommended Layout

GROUND PLANE

PARALLEL PLATE

DECOUPLING

CAPACITOR

NOTES

• FOR OPTIMUM PERFORMANCE, RIBBON BONDS ARE RECOMMENDED ON PADS 1, 5, 12, AND 14. WIRES ARE 3 MIL OR 5 MIL RIBBONS <400 m

• LONG. ALL OTHER PINS CAN BE ROUND WIRE <1mm.

• LASER’S ANODE IS CONNECTED TO VCC THROUGH GOLD LAYER ON TOP OF CERAMIC STANDOFF. STANDOFF MINIMIZES LENGTH OF PAD

• 12 AND PAD 14 RIBBONS.

• PARALLEL PLATE DECOUPLING CAPACITORS SHOULD BE >100pF AND BE OF MICROWAVE AVX TYPE, PART NO. GB0159391KA6N (390pF).

• THE RECOMMENDED SUBSTRATE CONNECTION IS TO GND. HOWEVER, PERFORMANCE IS NOT AFFECTED BY CONNECTING THE

• SUBSTRATE TO VCC.

• AN INDUCTOR SHOULD BE USED IN THE BIAS CURRENT PATH. A MICROWAVE COMPONENTS COIL 30-1847-GCCAS-01 (48 MIL

24 MIL)

SHOULD BE USED.

• THE EXTERNAL POWER SUPPLY IS CONNECTED AT THE PARALLEL PLATE DECOUPLING CAPACITOR.

MPD

TRANSMISSION LINE

GROUND PLANE

IBIAS OUTPUT INDUCTOR

LASER LIGHT

LASER

CERAMIC WITH GOLD

SURFACE THAT CONTACTS

THE LASER’S ANODE

PARALLEL PLATE

DECOUPLING

CAPACITORS

BACK FACET LIGHT

ADN2845

AGND

VCC

IMODP

IBIAS

AGND

ALS IMOD_CTRL IBIAS_CTRL

AGND

DATAP

AGND

DATAN

IMODNTERM

Figure 6. 10 Gbps Optical Diagram Provided Courtesy of NEL.

PAV = 0 dBm, ER = 5 dB, PRBS 31 Pattern.

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