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參數(shù)資料
| 型號： | UMA1022M |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | XO, clock |
| 英文描述： | Low cost dual frequency synthesizer for radio telephones |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2100 MHz, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT-266-1, SSOP-20 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 126K |
| 代理商： | UMA1022M |
1998 Dec 09
2
Philips Semiconductors
Product specification
Low cost dual frequency synthesizer for
radio telephones
UMA1022M
FEATURES
Low phase noise
Low current from 3 V supply
Fully programmable dividers
3-line serial interface bus
Input reference buffer configurable as an oscillator with
external crystal resonator
Wide compliance voltage charge pump outputs
Two power-down input control pins.
APPLICATIONS
900 MHz and 2 GHz digital radio telephones
Portable battery-powered radio equipment.
GENERAL DESCRIPTION
The UMA1022M BICMOS device integrates prescalers,
programmable dividers, a crystal oscillator/buffer and
phase comparators to implement two phase-locked loops.
The device is designed to operate from 3 NiCd or a single
LiIon cell in pocket phones, or from an external 3 V supply.
The synthesizers operate at RF input frequencies up to
2.1 GHz and 550 MHz. All divider ratios are supplied via a
3-wire serial programming bus. The reference divider uses
a common, fully programmable part and a separate
subdivider section. In this way the comparison frequencies
are related to each other allowing optimum isolation
between charge pump pulses.
Separate power and ground pins are provided to the
analog (charge pump, prescaler) and digital (CMOS)
circuits. An independent supply for the crystal oscillator
section allows maximum frequency stability. The ground
leads should be externally short-circuited to prevent large
currents flowing across the die and thus causing damage.
V
DD
and V
DDX
must be at the same potential. V
CCA
and
V
CCB
must be equal to each other and equal to or greater
than V
DD
(e.g. V
DD
= 3 V and V
CCA
= 5.5 V for wider VCO
control voltage range).
The charge pump currents (phase detector gain) are fixed
by internal resistances and controlled by the serial
interface. Only passive loop filters are necessary;
the charge pumps function within a wide voltage
compliance range to improve the overall system
performance.
Suitable pin layout is chosen to minimize coupling and
interference between signals entering or leaving the chip.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
DD
V
CCA
, V
CCB
V
DDX
I
tot
digital supply voltage
analog supply voltages
crystal reference supply voltage
all supply currents
(I
DD
+ I
CCA
+ I
CCB
+ I
DDX
) in active
mode
V
CCA
= V
CCB
≥
V
DD
V
CCA
= V
CCB
≥
V
DD
V
DDX
= V
DD
E = 1; V
CCA
= V
CCB
= 3.0 V;
V
DDX
= V
DD
= 3.0 V
XON = 0
XON = 1
2.7
2.7
2.7
3.0
3.0
3.0
5.5
5.5
5.5
V
V
V
14.65
15.9
40
mA
mA
μ
A
I
tot(pd)
total supply currents in power-down
mode
RF input frequency
IF input frequency
f
RF
f
IF
300
50
50
3
30
2000
2100
550
400
20
+85
MHz
MHz
MHz
MHz
kHz
°
C
V
CCA
= V
CCB
≤
4.0 V
f
xtal
f
PCmax
T
amb
crystal reference oscillator frequency
maximum loop comparison frequency
operating ambient temperature
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