UMA1017M Datasheet, PDF (2/16 Pages) NXP Semiconductors – Low-voltage frequency synthesizer for radio telephones

Philips Semiconductors
Low-voltage frequency synthesizer
for radio telephones
Product specification
UMA1017M
FEATURES
• Low current from 3 V supply
• Fully programmable RF divider
• 3-line serial interface bus
• Independent fully programmable reference divider,
driven from external crystal oscillator
• Dual phase detector outputs to allow fast frequency
switching
• Dual power-down modes.
APPLICATIONS
• 900 MHz mobile telephones
• Portable battery-powered radio equipment.
GENERAL DESCRIPTION
The UMA1017M BICMOS device integrates prescalers,
a programmable divider, and phase comparator to
implement a phase-locked loop.
The device is designed to operate from 3 NiCd cells, in
pocket phones, with low current and nominal 5 V supplies.
The synthesizer operates at RF input frequencies up to
1.25 GHz. The synthesizer has a fully programmable
reference divider. All divider ratios are supplied via a
3-wire serial programming bus.
Separate power and ground pins are provided to the
analog and digital circuits. The ground leads should be
externally short-circuited to prevent large currents flowing
across the die and thus causing damage. Digital supplies
V_DD1 and V_DD2 must also be at the same potential. V_CC
must be equal to or greater than V_DD (i.e. V_DD = 3 V and
V_CC = 5 V for wider tuning range).
The phase detector uses two charge pumps, one provides
normal loop feedback, while the other is only active during
fast mode to speed-up switching. All charge pump currents
(gain) are fixed by an external resistance at pin I_SET
(pin 14). Only passive loop filters are used; the
charge-pumps function within a wide voltage compliance
range to improve the overall system performance.
QUICK REFERENCE DATA
SYMBOL
V_CC, V_DD
I_CC + I_DD
I_CCPD, I_DDPD
f_VCO
f_XTAL
f_PC
T_amb
PARAMETER
CONDITIONS
supply voltage
supply current
V_CC ≥ V_DD
current in power-down mode per supply
RF input frequency
crystal reference input frequency
phase comparator frequency
operating ambient temperature
MIN. TYP. MAX. UNIT
2.7 −
5.5 V
−
7.7 −
mA
−
10 −
µA
50 −
1250 MHz
3
−
40 MHz
−
200 −
kHz
−30 −
+85 °C
ORDERING INFORMATION
TYPE NUMBER
UMA1017M
NAME
SSOP20
PACKAGE
DESCRIPTION
plastic shrink small outline package; 20 leads; body width 4.4 mm
VERSION
SOT266-1
1995 Jul 10
2