LMX1501 National Semiconductor, LMX1501 Datasheet - Page 2

• Manufacturer Part Number: LMX1501
• Description: PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications
• Manufacturer: National Semiconductor

Pin No
1501A
Connection Diagrams
Pin Descriptions
10
11
12
13
14
15
16
X
X
X
1
2
3
4
5
6
7
8
9
Order Number LMX1501AM or LMX1501AMX
JEDEC 16-Lead (0 150 Wide) Small
2 9 12 19
Pin No
1511
See NS Package Number M16A
10
11
13
14
15
16
17
18
20
1
3
4
5
6
7
8
Outline Molded Package (M)
1501A 1511
OSC
OSC
V
V
D
GND
LD
f
CLOCK
DATA
LE
FC
BISW
f
f
f
NC
LMX1501A
IN
r
p
OUT
Pin Name
P
CC
o
p
r
IN
OUT
I O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
TL W 12340– 2
Oscillator input A CMOS inverting gate input intended for connection to a
crystal resonator for operation as an oscillator The input has a V
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
Oscillator output
Power supply for charge pump must be
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
Internal charge pump output For connection to a loop filter for driving the input
of an external VCO
Ground
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
Prescaler input Small signal input from the VCO
High impedance CMOS Clock input Data is clocked in on the rising edge into
the various counters and registers
Binary serial data input Data entered MSB first LSB is control bit High
impedance CMOS input
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
Phase control select (with internal pull-up resistor) When FC is LOW the
polarity of the phase comparator and charge pump combination is reversed
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
Monitor pin of phase comparator input Programmable reference divider output
Monitor pin of phase comparator input Programmable divider output
Monitor pin of phase comparator input CMOS Output
Output for external charge pump
requires a pull-up resistor
Output for external charge pump
No connect
2
Order Number LMX1511TM or LMX1511TMX
20-Lead (0 173 Wide) Thin Shrink
See NS Package Number MTC20
Description
Small Outline Package (TM)
p
r
is a CMOS logic output
is an open drain N-channel transistor and
t
V
CC
LMX1511
o
CC
)
TL W 12340 – 3
2 input