U6239B datasheet(10/15 Pages) TEMIC

Part #	U6239B

Description	2.9 GHz PLL for SAT TV Tuner with UNi-Bus

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Manufacturer	TEMIC [TEMIC Semiconductors]

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U6239B

TELEFUNKEN Semiconductors

Rev. A3, 28-May-97

10 (15)

3-Wire Bus Description (continued)

Reference divider selection RD1, RD2, RDS:

RDS Voltage at

Pin 3

RD2

RD1

Reference

Divider Ratio

Frequency

Step Size*

Maximum Operating

Frequency*

0 to 10% VS or open

0

1

0

1

0

1

280

50

500

100

228.57 kHz

1280 kHz

128 kHz

640 kHz

2.9 GHz

2.097 GHz

2.9 GHz

90 to 100% VS

0

1

0

1

0

1

140

25

250

50

457.14 kHz

2560kHz

256 kHz

1280 kHz

2.9 GHz

* when a 4-MHz crystal is used

3-Wire Bus Pulse Diagram

P6

P4

SDA

MSB

14-bit scaling factor SF

SCL

ENABLE

P7

P5

LSB

RD1 RD2

4 Port bits/ 2 Ref.Div. bits

n13

n0

9611813

Figure 3.

n0 to n13

Scaling factor (SF)

SF = 8192

n13 + 4096

n12 + ... +2

n1 + n0

SF - Range: 256..16383

P4 to P7

Port outputs

P4 - P7 = 1: port active

RD1, RD2

Reference divider selection

see table above

3-Wire Bus Timing

TH

TS

TL

TT

LSB

Clock

Enable

Data

TSL

TC

9611880

Figure 4.

Parameters

Symbol

Min.

Max.

Unit

Setup time

TS

2

ms

Enable hold time

TSL

2

ms

Clock width

TC

2

ms

Enable setup time

TL

10

ms

Enable between two transmissions

TT

10

ms

Data hold time

TH

2

ms

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