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PDF LMX1501A Data sheet ( Hoja de datos )
| Número de pieza | LMX1501A | |
| Descripción | PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 1995
LMX1501A LMX1511 PLLatinumTM
1 1 GHz Frequency Synthesizer
for RF Personal Communications
General Description
The LMX1501A and the LMX1511 are high performance fre-
quency synthesizers with integrated prescalers designed for
RF operation up to 1 1 GHz They are fabricated using Na-
tional’s ABiC IV BiCMOS process
The LMX1501A and the LMX1511 contain dual modulus
prescalers which can select either a 64 65 or a 128 129
divide ratio at input frequencies of up to 1 1 GHz Using a
proprietary digital phase locked loop technique the
LMX1501A 11’s linear phase detector characteristics can
generate very stable low noise local oscillator signals
Serial data is transferred into the LMX1501A and the
LMX1511 via a three line MICROWIRETM interface (Data
Enable Clock) Supply voltage can range from 2 7V to 5 5V
The LMX1501A and the LMX1511 feature very low current
consumption typically 6 mA at 3V
The LMX1501A is available in a JEDEC 16-pin surface
mount plastic package The LMX1511 is available in a
TSSOP 20-pin surface mount plastic package
Features
Y RF operation up to 1 1 GHz
Y 2 7V to 5 5V operation
Y Low current consumption
ICC e 6 mA (typ) at VCC e 3V
Y Dual modulus prescaler 64 65 or 128 129
Y Internal balanced low leakage charge pump
Y Small-outline plastic surface mount JEDEC 0 150
wide (1501A) or TSSOP 0 173 wide (1511) package
Applications
Y Cellular telephone systems
(AMPS NMT ETACS)
Y Portable wireless communications
(PCS PCN Cordless)
Y Advanced cordless telephone systems
(CT-1 CT-1a CT-2 ISM902-928)
Y Other wireless communication systems
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL W 12340
TL W 12340 – 1
RRD-B30M115 Printed in U S A
1 page  
Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Power Supply Voltage
VCC
VP
Voltage on Any Pin
with GND e 0V (VI)
Storage Temperature Range (TS)
Lead Temperature (TL) (solder 4 sec )
b0 3V to a6 5V
b0 3V to a6 5V
b0 3V to a6 5V
b65 C to a150 C
a260 C
Recommended Operating
Conditions
Power Supply Voltage
VCC 2 7V to 5 5V
VP VCC to 5 5V
Operating Temperature (TA)
b40 C to a85 C
Note 1 Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur Operating Ratings indicate conditions for which the
device is intended to be functional but do not guarantee specific perform-
ance limits For guaranteed specifications and test conditions see the Elec-
trical Characteristics The guaranteed specifications apply only for the test
conditions listed
Electrical Characteristics VCC e 5 0V VP e 5 0V b40 C k TA k 85 C except as specified
Symbol
Parameter
Conditions
Min Typ Max Units
ICC Power Supply Current
VCC e 3 0V
60 80
mA
VCC e 5 0V
65 85
mA
fIN Maximum Operating Frequency
1 1 GHz
fOSC
Maximum Oscillator Frequency
20 MHz
fw Maximum Phase Detector Frequency
10 MHz
PfIN Input Sensitivity
VCC e 2 7V to 5 5V
b10
a6 dBm
VOSC
Oscillator Sensitivity
OSCIN
05
VPP
VIH High-Level Input Voltage
0 7 VCC
V
VIL Low-Level Input Voltage
0 3 VCC
V
IIH
High-Level Input Current (Clock Data)
VIH e VCC e 5 5V
b1 0
1 0 mA
IIL
Low-Level Input Current (Clock Data)
VIL e 0V VCC e 5 5V
b1 0
1 0 mA
IIH Oscillator Input Current
VIH e VCC e 5 5V
100 mA
IIL
VIL e 0V VCC e 5 5V
b100
mA
IIH
High-Level Input Current (LE FC)
VIH e VCC e 5 5V
b1 0
1 0 mA
IIL
Low-Level Input Current (LE FC)
VIL e 0V VCC e 5 5V
b100
1 0 mA
Except fIN and OSCIN
5
5 Page 
Functional Description (Continued)
PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter) If the Control
Bit (last bit shifted into the Data Register) is LOW data is transferred from the 19-bit shift register into a 7-bit latch (which sets
the 7-bit Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter) Serial data format is shown
below
Note S8 to S18 Programmable counter divide ratio control bits (3 to 2047)
TL W 12340 – 21
7-BIT SWALLOW COUNTER DIVIDE RATIO
(A COUNTER)
Divide S S S S S S S
Ratio 7 6 5 4 3 2 1
A
0 0000000
1 0000001
127 1 1 1 1 1 1 1
Note Divide ratio 0 to 127
BtA
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
(B COUNTER)
Divide S S S S S S S S S S S
Ratio 18 17 16 15 14 13 12 11 10 9 8
B
3 0 0 0 0 0 0 0 0 0 11
4 0 0 0 0 0 0 0 0 1 00
2047 1 1 1 1 1 1 1 1 1 1 1
Note Divide ratio 3 to 2047 (Divide ratios less than 3 are prohibited)
BtA
PULSE SWALLOW FUNCTION
fVCO e (P c B) a A c fOSC R
fVCO Output frequency of external voltage controlled oscil-
lator (VCO)
B Preset divide ratio of binary 11-bit programmable
counter (3 to 2047)
A Preset divide ratio of binary 7-bit swallow counter
(0 s A s 127 A s B)
fOSC Output frequency of the external reference frequency
oscillator
R Preset divide ratio of binary 14-bit programmable ref-
erence counter (3 to 16383)
P Preset modulus of dual moduIus prescaler (64 or
128)
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LMX1501A.PDF ] | |
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