TL W 12340
LMX1501ALMX1511
PLLatinum
11
GHz
Frequency
Synthesizer
for
RF
Personal
Communications
November 1995
LMX1501A LMX1511 PLLatinum
TM
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 MICROWIRE
TM
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
I
CC
e
6 mA (typ) at V
CC
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-1
a
CT-2 ISM902-928)
Y
Other wireless communication systems
Block Diagram
TL W 12340 1
TRI-STATE
is a registered trademark of National Semiconductor Corporation
MICROWIRE
TM
and PLLatinum
TM
are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Connection Diagrams
LMX1501A
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
LMX1511
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20-Lead (0 173 Wide) Thin Shrink
Small Outline Package (TM)
Order Number LMX1511TM or LMX1511TMX
See NS Package Number MTC20
Pin Descriptions
Pin No
Pin No
Pin Name
I O
Description
1501A
1511
1501A 1511
1
1
OSC
IN
I
Oscillator input A CMOS inverting gate input intended for connection to a
crystal resonator for operation as an oscillator The input has a V
CC
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
2
3
OSC
OUT
O
Oscillator output
3
4
V
P
Power supply for charge pump must be
t
V
CC
4
5
V
CC
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
5
6
D
o
O
Internal charge pump output For connection to a loop filter for driving the input
of an external VCO
6
7
GND
Ground
7
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
8
10
f
IN
I
Prescaler input Small signal input from the VCO
9
11
CLOCK
I
High impedance CMOS Clock input Data is clocked in on the rising edge into
the various counters and registers
10
13
DATA
I
Binary serial data input Data entered MSB first LSB is control bit High
impedance CMOS input
11
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
12
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
X
16
BISW
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 D
o
)
13
f
r
O
Monitor pin of phase comparator input Programmable reference divider output
14
f
p
O
Monitor pin of phase comparator input Programmable divider output
X
17
f
OUT
O
Monitor pin of phase comparator input CMOS Output
15
18
w
p
O
Output for external charge pump w
p
is an open drain N-channel transistor and
requires a pull-up resistor
16
20
w
r
O
Output for external charge pump w
r
is a CMOS logic output
X
2 9 12 19
NC
No connect
2
Functional Block Diagram
LMX1501A
TL W 12340 40
3
Functional Block Diagram
(Continued)
LMX1511
TL W 12340 4
4
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
V
CC
b
0 3V to
a
6 5V
V
P
b
0 3V to
a
6 5V
Voltage on Any Pin
with GND
e
0V (V
I
)
b
0 3V to
a
6 5V
Storage Temperature Range (T
S
)
b
65 C to
a
150 C
Lead Temperature (T
L
) (solder 4 sec )
a
260 C
Recommended Operating
Conditions
Power Supply Voltage
V
CC
2 7V to 5 5V
V
P
V
CC
to 5 5V
Operating Temperature (T
A
)
b
40 C to
a
85 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
V
CC
e
5 0V V
P
e
5 0V
b
40 C
k
T
A
k
85 C except as specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
CC
Power Supply Current
V
CC
e
3 0V
6 0
8 0
mA
V
CC
e
5 0V
6 5
8 5
mA
f
IN
Maximum Operating Frequency
1 1
GHz
f
OSC
Maximum Oscillator Frequency
20
MHz
f
w
Maximum Phase Detector Frequency
10
MHz
Pf
IN
Input Sensitivity
V
CC
e
2 7V to 5 5V
b
10
a
6
dBm
V
OSC
Oscillator Sensitivity
OSC
IN
0 5
V
PP
V
IH
High-Level Input Voltage
0 7 V
CC
V
V
IL
Low-Level Input Voltage
0 3 V
CC
V
I
IH
High-Level Input Current (Clock Data)
V
IH
e
V
CC
e
5 5V
b
1 0
1 0
m
A
I
IL
Low-Level Input Current (Clock Data)
V
IL
e
0V V
CC
e
5 5V
b
1 0
1 0
m
A
I
IH
Oscillator Input Current
V
IH
e
V
CC
e
5 5V
100
m
A
I
IL
V
IL
e
0V V
CC
e
5 5V
b
100
m
A
I
IH
High-Level Input Current (LE FC)
V
IH
e
V
CC
e
5 5V
b
1 0
1 0
m
A
I
IL
Low-Level Input Current (LE FC)
V
IL
e
0V V
CC
e
5 5V
b
100
1 0
m
A
Except f
IN
and OSC
IN
5
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