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7

DS-DMX250 R 0.80

www.yamar.com

Tel: +972-3-5445294 Fax: +972-3-5445279

2.5.3

External Crystal

The device operates with a low cost, small size 16MHz crystal connected between OSCI and OSCO pins. Each of

these pins should be connected to the DGND via a load capacitor. The load capacitors' values should be

determined according to the crystal manufacturer's recommendations and the actual PCB layout. The PCB traces

should be as short as possible.

The overall frequency tolerance should not exceed ± 50ppm.

2.5.3.1

Recommended Crystals

o

NDK - NX2520SA-16MHz, SMD, 2.5x2 mm

o

NDK - NX3225SA/GB-16MHz, SMD, 3.2x2.5mm

o

NDK - NX2016GC-16MHz, SMD, 2.0x1.6mm

o

ECS - ECS-160-12-37B-CTN-TR, SMD, 2.0x1.6mm

2.5.3.2

16MHz clock from an external source

It is possible to operate the device from an external 16HMz clock source that meets the requirements above.

Figure 6 depicts an external 16MHz clock connection to the device.

Figure 6 - External 16MHz clock connection

2.5.4

L1 and L2 inductors

The DMX250 requires one or two inductors for its operation, depending on the desired operating frequency.

- For full in-band operation, 5MHz - 30MHz:

 L1 - 3.3uH

 L2 - 15uH with 10nF series capacitor between L2 pin and L2 inductor.

- For low in-band operation, 5MHz -12MHz:

 L1 - 18uH

 L2 - NC

- For high in-band operation, 12MHz - 30MHz:

 L1 - 3.3uH

 L2 - NC

Figure 7 depicts the in-band operation inductors' connection to pins L1 and L2.

Figure 7 - L1 and L2 inductors connections