Philips UMA1014T Datasheet

INTEGRATED CIRCUITS

DATA SH EET

UMA1014

Low-power frequency synthesizer
for mobile radio communications

Product specification
Supersedes data of October 1991
File under Integrated circuits, IC03

October 1992

Philips Semiconductors Product specification

Low-power frequency synthesizer for
mobile radio communications

FEATURES

• Single chip synthesizer; compatible with Philips cellular
radio chipset

• Fully programmable RF divider

• I2C interface for two-line serial bus

• On-chip crystal oscillator/TCXO buffer from 3 to 16 MHz

• 16 reference division ratios allowing 5 to 100 kHz

channel spacing

• 1/8 crystal frequency output

• On-chip out-of-lock indication

• Two extra VCO control outputs

• Latched synthesizer alarm output

• Status register including out-of-lock indication and

power failure

• Power-down mode.

APPLICATIONS

UMA1014

GENERAL DESCRIPTION

The UMA1014 is a low-power universal synthesizer which
has been designed for use in channelized radio
communication. The IC is manufactured in bipolar
technology and is designed to operate at 5 to 100 kHz
channel spacing with an RF input from 50 to 1100 MHz.
The channel is programmed via a standard I
low-power sensitive RF divider is incorporated together
with a dead-zone eliminated, 3-state phase comparator.
The low-noise charge pump delivers 1 mA or 1/2 mA
output current to enable a better compromise between fast
switching and loop bandwidth. A power-down circuit
enables the synthesizer to be set to idle mode.

2

C-bus. A

• Cellular mobile radio (NMT, AMPS, TACS)

• Private mobile radio (PMR)

• Cordless telephones.

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V

CC

I

CC

I

CCpd

f

ref

f

RF

T

amb

, V

+ I

CP

CP

supply voltage range 4.5 5.0 5.5 V
supply current − 13 − mA
ICC in power-down − 2.5 − mA
phase comparator reference frequency 5 − 100 kHz
RF input frequency 50 − 1100 MHz
operating ambient temperature range −40 − 85 °C

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

UMA1014T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

October 1992 2

October 1992 3

BLOCK DIAGRAM

mobile radio communications

Philips Semiconductors Product specification

Low-power frequency synthesizer for

oscillator input

oscillator output

RF input

hardware

power-down

slave address

select input A

1

BUFFER/

2

OSCILLATOR

8

31/32

11

12

15 9 10 7 13

synthesizer

alarm

output

MAIN

CONTROL

1/8 crystal

ground+5 V supply

4 6 16 14 3

frequency

output

internally

connected

UMA1014

PHASE

COMPARATOR

OUT-OF-

LOCK

3-BITS

MAIN

DIVIDER

18-BITS 4-BITS 1-BIT 1-BIT

VCO buffer switch output B
VCO buffer switch output A
serial data input/output
serial clock input

REFERENCE

DIVIDER

+5 V charge

pump supply

CHARGE

PUMP

MRA396 - 1

charge

5

pump
output

handbook, full pagewidth

Fig.1 Block diagram.

UMA1014

Philips Semiconductors Product specification

Low-power frequency synthesizer for
mobile radio communications

PINNING

SYMBOL PIN DESCRIPTION

OSCIN 1 oscillator or TCXO input
OSCOUT 2 oscillator output
V

CP

V

CC

PCD 5 charge pump output
GND 6 ground
VCOA 7 VCO buffer switch output A

RF 8 RF input
SCL 9 serial clock input
SDA 10 serial data input/output
HPD 11 hardware power-down (active LOW)
SAA 12 slave address select input A
VCOB 13 VCO buffer switch output B
i.c. 14 internally connected
SYA 15 synthesizer alarm output
FX8 16 1/8 crystal frequency output

3 5 V charge pump supply
4 5 V supply

(including out-of-lock)

handbook, halfpage

OSCOUT

OSCIN

VCOA

1

215

V

3

CP

4

V

CC

PCD

GND

RF

UMA1014

5

6

7

8

MRA397 - 1

Fig.2 Pin configuration.

UMA1014

16

FX8

SYA

14

i.c.

13

VCOB

12

SAA

11

HPD

10

SDA

9

SCL

October 1992 4

Philips Semiconductors Product specification

Low-power frequency synthesizer for
mobile radio communications

FUNCTIONAL DESCRIPTION

The UMA1014 is a low-power frequency synthesizer for
radio communication which operates in the
50 to 1100 MHz range. The device includes an
oscillator/buffer circuit, a reference divider, an RF divider,
a 3-state phase comparator, a charge pump and a main
control circuit to transfer the serial data into the four
internal 8-bit registers. The VCC supply feeds the logic part,
the VCP supply feeds the charge-pump only. Both supplies
are +5 V (±10%). The power-down facility puts the
synthesizer in the idle mode (all current supplies are
switched off except in the control part). This allows any I
transfer and all information in the registers is retained thus
enabling fast power-up.

Main divider

The main divider is a pulse swallow type counter which is
fully programmable. After a sensitive input amplifier
(50 mV, −13 dBm), the RF signal is applied to a 31/32
duo-modulus counter. The output is then used as the clock
for the 5-bit swallow counter R = (MD4 to MD0) and the
13-bit main counter N = (MD17 to MD5). The ratio is
transferred via the I
then buffered in an 18-bit latch. The ratio in the divider
chain is updated with the new information when the least
significant bit is received (i.e. D0). This update is
synchronized to the output of the divider in order to limit the
phase error during small jumps of the synthesized
frequency.

The main divider can be programmed to any value
between 2048 and 262143 (i.e. 218−1). If ratio X, below
2048, is sent to the divider, the ratio (X + 2048) will be
programmed. When it is required to switch between
adjacent channels it is possible to program register D only,
thus allowing shorter I2C programming time.

Oscillator

The oscillator is a common collector Colpitts type with
external capacitive feedback. The oscillator has very small
temperature drift and high voltage supply rejection. A
TCXO or other type of clock can be used to drive the
oscillator by connecting the source (preferably
AC-coupled) to pin 1 and leaving pin 2 open-circuit. The
oscillator acts as a buffer in this mode and requires no
additional external components. The signal from the clock
source should have a minimum space width of 31 ns.

2

C-bus to the registers B, C and D, and

2

UMA1014

Reference divider

The reference divider is semi-programmable with 16
division ratios which can be selected via the I
programming uses four bits of the register A (A3 to A0) as
listed in Table 2. These ratios allow the use of a large
number of crystal frequencies from 3 MHz up to 16 MHz.
All main channel spacings can be obtained with a single
crystal/TXCO frequency of 9.6 MHz.

Phase comparator

A diagram of the phase comparator and charge pump is

C

illustrated in Fig.3.
The phase comparator is both a phase and frequency

detector. The detector comprises dual flip-flops together
with logic circuitry to eliminate the dead-zone. When a
phase error is detected the UP or DOWN signal goes
HIGH. This switches on the corresponding current
generator which produces a source or sink current for the
loop filter. When no phase error is detected PCD goes high
impedance. The final tuning voltage for the VCO is
provided by the loop filter. The charge pump current is
programmable via the I
logic 1 the charge pump delivers 1 mA; when IPCD is set
to logic 0 the charge pump delivers 0.5 mA.

The phase comparator has a phase inverter logic input
(PHI). This allows the use of inverted or non-inverted loop
filter configurations. It is thus possible to use a passive
loop filter which offers higher performances without an
operational amplifier. The function of the phase
comparator is given in Table 3 and a typical transfer curve
is illustrated in Fig.4.

Out-of-lock detector

An out-of-lock detector using the UP and DOWN signals
from the phase comparator is included on-chip. The pin
VCOA is an open collector output which is forced LOW
during an out-of-lock condition. The same information is
also available via the I
OOL). When the phase error (measured at the phase
comparator) is greater than approximately 200 ns, an
out-of-lock condition is immediately flagged. The flag is
only released after 6 reference cycles when the phase
error is less than 200 ns.

2

C-bus. When IPCD (bit 5) is set to

2

C-bus in the status register (bit

2

C-bus. The

October 1992 5

Philips Semiconductors Product specification

Low-power frequency synthesizer for

UMA1014

mobile radio communications

Table 1 Division ratio in the main divider

MAIN COUNTER: N SWALLOW COUNTER: R

MD17 MD16 MD15 ... MD8 MD7 ... MD5 MD4 ... MD0

B1 B0 C7 ... C0 D7 ... D5 D4 ... D0

MSB LSB

Table 2 Reference divider programming

A3(RD3) A2(RD2) A1(RD1) A0(RD0)

REFERENCE DIVISION

RATIO

0000 128 75 kHz
0001 160 60 kHz
0010 192 50 kHz
0011 240 40 kHz
0100 256 37.5 kHz
0101 320 30 kHz
0110 384 25 kHz
0111 480 20 kHz
1000 512 18.75 kHz
1001 640 15 kHz
1010 768 12.5 kHz
1011 960 10 kHz
1100 1024 9.375 kHz
1101 1280 7.5 kHz
1110 1536 6.25 kHz
1111 1920 5 kHz

CHANNEL SPACING FOR 9.6 MHz AT

OSCIN

Table 3 Operation of the phase comparator

PHI = 0 (PASSIVE LOOP FILTER) PHI = 1 (ACTIVE LOOP FILTER)

f

ref

< f

var

f

ref

> f

var

f

ref

= f

var

f

ref

< f

var

f

ref

> f

var

f

= f

ref

var

UP010100

DOWN 100010

I

pcd

−1 mA 1 mA <±5 nA 1 mA −1 mA <±5 nA

October 1992 6