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LMX1511 Datasheet

PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications

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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


National Semiconductor Electronic Components Datasheet

LMX1511 Datasheet

PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications

No Preview Available !

Connection Diagrams
LMX1501A
LMX1511
TL W 12340–2
JEDEC 16-Lead (0 150 Wide) Small
Outline Molded Package (M)
Order Number LMX1501AM or LMX1501AMX
See NS Package Number M16A
Pin Descriptions
TL W 12340 – 3
20-Lead (0 173 Wide) Thin Shrink
Small Outline Package (TM)
Order Number LMX1511TM or LMX1511TMX
See NS Package Number MTC20
Pin No
1501A
1
2
3
4
5
6
7
8
9
10
11
12
X
13
14
X
15
16
X
Pin No
1511
Pin Name
1501A 1511
IO
Description
1 OSCIN
I Oscillator input A CMOS inverting gate input intended for connection to a
crystal resonator for operation as an oscillator The input has a VCC 2 input
threshold and can be driven from an external CMOS or TTL logic gate May also
be used as a buffer for an externally provided reference oscillator
3 OSCOUT
O Oscillator output
4 VP
5 VCC
Power supply for charge pump must be t VCC
Power supply voltage input Input may range from 2 7V to 5 5V Bypass
capacitors should be placed as close as possible to this pin and be connected
directly to the ground plane
6 Do
O Internal charge pump output For connection to a loop filter for driving the input
of an external VCO
7 GND
Ground
8 LD
O Lock detect Output provided to indicate when the VCO frequency is in ‘‘lock’’
When the loop is locked the pin’s output is HIGH with narrow low pulses
10 fIN
11 CLOCK
I Prescaler input Small signal input from the VCO
I High impedance CMOS Clock input Data is clocked in on the rising edge into
the various counters and registers
13 DATA
I Binary serial data input Data entered MSB first LSB is control bit High
impedance CMOS input
14 LE
I Load enable input (with internal pull-up resistor) When LE transitions HIGH
data stored in the shift registers is loaded into the appropriate latch (control bit
dependent) Clock must be low when LE toggles high or low See Serial Data
Input Timing Diagram
15 FC
I Phase control select (with internal pull-up resistor) When FC is LOW the
polarity of the phase comparator and charge pump combination is reversed
16 BISW
fr
O Analog switch output When LE is HIGH the analog switch is ON routing the
internal charge pump output through BISW (as well as through Do)
O Monitor pin of phase comparator input Programmable reference divider output
fp O Monitor pin of phase comparator input Programmable divider output
17 fOUT
18 wp
O Monitor pin of phase comparator input CMOS Output
O Output for external charge pump wp is an open drain N-channel transistor and
requires a pull-up resistor
20
2 9 12 19
wr
NC
O Output for external charge pump wr is a CMOS logic output
No connect
2


Part Number LMX1511
Description PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications
Maker National Semiconductor
Total Page 22 Pages
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