U2781B Datasheet, PDF(5/10 Page) TEMIC Semiconductors

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U2781B Datasheet, PDF (5/10 Pages) TEMIC Semiconductors – Frequency Synthesizer

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Timing 3-Wire Bus

MSB

P 17

P 16

PSC

R 13

Data

U2781B

LSB

C = 0 : Prog. scaler data

C = 1 : Reference scaler date

Clock

Enable

All times t1 to t5 > 1 ms

Figure 3.

93 7787 e

Phase-Detector Polarity

The polarity of the phase detector can be changed with the signal MO (emitter follower output with ECL level) will

PS input. Depending on the PS input level, the charge- be switched over from fP to fR simultanously.

pump current will also be inverted. The monitor output

ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃfffRRR ><=ÃÃÃÃÃfffPPPÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃIÃÃÃÃÃsICos0iunPrkPcÃÃÃÃÃeS =ÃÃÃÃÃHigÃÃÃÃÃh oÃÃÃÃÃr OpÃÃÃÃÃenMfffÃÃÃÃÃRRRO ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃIÃÃÃÃÃsICos0iunPrkÃÃÃÃÃce ÃÃÃÃÃPSÃÃÃÃÃ= LÃÃÃÃÃow ÃÃÃÃÃMfffÃÃÃÃÃPPPO ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ

Depending on the VCO frequency versus tuning voltage characteristic, the PS input has to be programmed as follows:

For increasing tuning voltage and increasing frequency:

decreasing frequency:

PS = High or open

PS = Low.

TELEFUNKEN Semiconductors

Rev. A3, 26-Nov-97

5 (10)

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