UMA1020AM datasheet(7/20 Pages) PHILIPS

Part #	UMA1020AM

Description	Low-voltage dual frequency synthesizer for radio telephones

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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7 / 20 page

1995 Jul 06

7

Philips Semiconductors

Product speciﬁcation

Low-voltage dual frequency

synthesizer for radio telephones

UMA1020AM

Table 4

Fast and normal charge pumps current ratio (note 1)

Note

1. ISET =

; common bias current for charge pumps.

Table 5

Power-down modes

CR1

CR0

ICPA

ICPP

ICPPF

ICPPF :ICPP

00

4

× ISET

4

× ISET

16

× ISET

4:1

01

4

× ISET

4

× ISET

32

× ISET

8:1

10

4

× I

SET

2

× ISET

24

× ISET

12 : 1

11

4

× I

SET

2

× ISET

32

× ISET

16 : 1

AOFF

POFF

FAST

PRINCIPAL

DIVIDERS

AUXILIARY

DIVIDERS

PUMP

CPA

PUMP

CPP

PUMP

CPPF

1

X

OFF

1

0

ON

OFF

ON

OFF

1

0

1

ON

OFF

ON

0

1

X

OFF

ON

OFF

0

ON

OFF

0

1

ON

ONONON

V

14

R

ext

-----------

Power-down modes

The action of the control inputs on the state of internal

blocks is defined by Table 5.

Note that in Table 5, POFF and AOFF can be either the

software or hardware power-down signals. The dividers

are ON when both hardware and software power-down

signals are at logic 0.

When either synthesizer is reactivated after power-down

the main and reference dividers of that synthesizer are

synchronized to avoid the possibility of random phase

errors on power-up.

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