UMA1021M Datasheet, PDF (4/16 Pages) NXP Semiconductors – Low-voltage frequency synthesizer for radio telephones

Philips Semiconductors
Low-voltage frequency synthesizer
for radio telephones
Product specification
UMA1021M
PINNING
SYMBOL PIN
DESCRIPTION
FAST
1 enable input for fast charge-pump
output CPF
CPF
2 fast charge-pump output
CP
3 normal charge-pump output
V_DD2
V_SS3
RFI
4 power supply 2
5 ground 3
6 2 GHz main divider input
V_SS2
POL
7 ground 2
8 digital input to select polarity of
power-on inputs (PON and sPON):
POL = 0 for active LOW and
POL = 1 for active HIGH
PON
9 power-on input
V_SS1
CLK
10 ground 1
11 programming bus clock input
DATA
12 programming bus data input
E
13 programming bus enable input
V_DD1
XTALB
14 power supply 1
15 complementary crystal frequency
input from TCXO; if not used should
be decoupled to ground
XTALA
16 crystal frequency input from TCXO;
if not used should be decoupled to
ground
GND(CP) 17 ground for charge-pump
V_CC
18 supply for charge-pump
I_SET
19 external resistor from this pin to
ground sets the charge-pump
currents
LOCK
20 out-of-lock detector output
handbook, halfpage
FAST 1
20 LOCK
CPF 2
19 ^ISET
CP 3
VDD2 ₄
18 VCC
17 GND(CP)
VSS3 5
16 XTALA
UMA1021M
RFI 6
15 XTALB
VSS2 ₇
14 ^VDD1
POL 8
13 E
PON 9
VSS1 ₁₀
12 DATA
11 CLK
MBG365
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
Main divider
The main divider is clocked at pin RFI by the RF signal
which is AC-coupled from an external VCO. The divider
operates with signal levels from 50 to 225 mV (RMS), and
at frequencies from 300 MHz to 2.2 GHz. It consists of a
fully programmable bipolar prescaler followed by a CMOS
counter. Any divide ratios from 512 to 131071 inclusive
can be programmed.
Reference divider
The reference divider is clocked by the differential signal
between pins XTALA and XTALB. If only one of these
inputs is used, the other should be decoupled to ground.
The applied input signal(s) should be AC-coupled.
The circuit operates with levels from
50 up to 500 mV (RMS) and at frequencies from
3 to 35 MHz. Any divide ratios from 8 to 2047 inclusive
can be programmed.
1999 Jun 17
4