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National Semiconductor Electronic Components Datasheet

LMX2315 Datasheet

Frequency Synthesizer for RF Personal Communications

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September 1996
LMX2315 LMX2320 LMX2325 PLLatinumTM
Frequency Synthesizer
for RF Personal Communications
LMX2325 2 5 GHz
LMX2320 2 0 GHz
LMX2315 1 2 GHz
General Description
The LMX2315 2320 2325’s are high performance frequen-
cy synthesizers with integrated prescalers designed for RF
operation up to 2 5 GHz They are fabricated using Nation-
al’s ABiC IV BiCMOS process
A 64 65 or a 128 129 divide ratio can be selected for the
LMX2315 and LMX2320 RF synthesizer at input frequencies
of up to 1 2 GHz and 2 0 GHz while 32 33 and 64 65 divide
ratios are available in the 2 5 GHz LMX2325 Using a propri-
etary digital phase locked loop technique the LMX2315
2320 2325’s linear phase detector characteristics can gen-
erate very stable low noise signals for controlling a local
oscillator
Serial data is transferred into the LMX2320 and the
LMX2325 via a three line MICROWIRETM interface (Data
Enable Clock) Supply voltage can range from 2 7V to 5 5V
The LMX2315 LMX2320 and the LMX2325 feature very low
current consumption typically 6 mA 10 mA and 11 mA re-
spectively
The LMX2315 LMX2320 and the LMX2325 are available in
a TSSOP 20-pin surface mount plastic package
Features
Y RF operation up to 2 5 GHz
Y 2 7V to 5 5V operation
Y Low current consumption
Y Dual modulus prescaler
LMX2325
32 33 or 64 65
LMX2320 LMX2315
64 65 or 128 129
Y Internal balanced low leakage charge pump
Y Power down feature for sleep mode
ICC e 30 mA (typ) at VCC e 3V
Y Small-outline plastic surface mount TSSOP 0 173
wide
Applications
Y Cellular telephone systems
(GSM IS-54 IS-95 (RCR-27)
Y Portable wireless communications (DECT PHS)
Y CATV
Y Other wireless communication systems
Block Diagram
TL W 12339 – 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL W 12339
RRD-B30M106 Printed in U S A
http www national com


National Semiconductor Electronic Components Datasheet

LMX2315 Datasheet

Frequency Synthesizer for RF Personal Communications

No Preview Available !

Connection Diagrams
LMX2315 LMX2320 LMX2325
TL W 12339 – 2
20-Lead (0 173 Wide) Thin Shrink Small Outline Package (TM)
Order Number LMX2315TM LMX2315TMX LMX2325TM LMX2325TMX LMX2320TM or LMX2320TMX
See NS Package Number MTC20
Pin Descriptions
Pin No
1
3
4
5
6
7
8
10
11
13
14
15
16
17
18
19
20
2 9 12
Pin Name I O
Description
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
OSCOUT
VP
VCC
O Oscillator output
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
Do
GND
O Internal charge pump output For connection to a loop filter for driving the input of an external VCO
Ground
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
fIN
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
DATA
I Binary serial data input Data entered MSB first LSB is control bit High impedance CMOS input
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
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
BISW
fOUT
wp
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 CMOS output
O Output for external charge pump wp is an open drain N-channel transistor and requires a pull-up
resistor
PWDN
I Power Down (with internal pull-up resistor)
PWDN e HIGH for normal operation
PWDN e LOW for power saving
Power down function is gated by the return of the charge pump to a TRI-STATE condition
wr O Output for external charge pump wr is a CMOS logic output
NC No connect
http www national com
2


Part Number LMX2315
Description Frequency Synthesizer for RF Personal Communications
Maker National Semiconductor
Total Page 22 Pages
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