
1995 Jun 22
2
Philips Semiconductors
Product specification
Low-power dual frequency synthesizer
for radio communications
UMA1015M
FEATURES
Two fully programmable RF dividers up to 1.1 GHz
Fully programmable reference divider up to 35 MHz
2 : 1 or 1 : 1 ratio of selectable reference frequencies
Fast three-line serial bus interface
Adjustable phase comparator gain
Programmable out-of-lock indication for both loops
On-chip voltage doubler
Low current consumption from 3 V supply
Separate power-down mode for each synthesizer
Up to 4 open-drain output ports.
APPLICATIONS
Cordless telephone
Hand-held mobile radio.
GENERAL DESCRIPTION
The UMA1015M is a low-power dual frequency
synthesizer for radio communications which operates in
the 50 to 1100 MHz frequency range. Each synthesizer
consists of a fully programmable main divider, a phase and
frequency detector and a charge pump. There is a fully
programmable reference divider common to both
synthesizers which operates up to 35 MHz. The device is
programmed via a 3-wire serial bus which operates up to
10 MHz. The charge pump currents (gains) are fixed by an
external resistance at pin 20 (I
SET
). The BiCMOS device is
designed to operate from 2.6 V (3 Ni-Cd cells) to 5.5 V at
low current. Digital supplies V
DD1
and V
DD2
must be at the
same potential. The charge pump supply (V
CC
) can be
provided by an external source or on-chip voltage doubler.
V
CC
must be equal to or higher than V
DD1
. Each
synthesizer can be powered-down independently via the
serial bus to save current. It is also possible to power-down
the device via the HPD input (pin 5).
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
DD1
, V
DD2
V
CC
digital supply voltage
charge pump supply
voltage
charge pump supply from
voltage doubler
operating supply current
V
DD1
= V
DD2
external supply; doubler
disabled; V
CC
≥
V
DD
doubler enabled
2.6
2.6
5.5
6.0
V
V
V
CCvd
2V
DD1
0.6
6.0
V
I
DDO1
+I
DDO2
+
I
CCO
I
DD1pd
+ I
DD2pd
+ I
CCpd
I
DD1pd
both synthesizers ON; doubler
disabled; V
DD1
= V
DD2
= 5.5 V
doubler disabled;
V
DD1
= V
DD2
= 5.5 V
doubler enabled;
V
DD1
= V
DD2
= 3 V
9.6
mA
current in power-down
mode per supply
current in power-down
mode from supply V
DD
RF input frequency for
each synthesizer
crystal input frequency
minimum phase
comparator frequency
maximum phase
comparator frequency
operating ambient
temperature
0.01
mA
0.15
mA
f
RFA
, f
RFB
50
1100
MHz
f
XTALIN
f
pc(min)
3
10
35
MHz
kHz
f
RF
= 50 to 1100 MHz;
f
XTALIN
= 3 to 35 MHz
f
RF
= 50 to 1100 MHz;
f
XTALIN
= 3 to 35 MHz
synthesizer A
2.6 V
≤
V
DD
≤
5.5 V
synthesizer B
2.6 V
≤
V
DD
≤
4.5 V
synthesizer B
2.6 V
≤
V
DD
≤
5.0 V
f
pc(max)
750
T
amb
30
+85
°
C
30
+85
°
C
0
+85
°
C