LMX2330L/LMX2331L/LMX2332L PLLatinum Low Power Dual Frequency Synthesizer for RF
Personal Communications
June 1999
LMX2330L/LMX2331L/LMX2332L
PLLatinum
™
Low Power Dual Frequency Synthesizer for
RF Personal Communications
LMX2330L 2.5 GHz/510 MHz
LMX2331L 2.0 GHz/510 MHz
LMX2332L 1.2 GHz/510 MHz
Features
n
Ultra low current consumption
n
2.7V to 5.5V operation
n
Selectable synchronous or asynchronous powerdown
mode:
I
CC
= 1 µA typical at 3V
n
Dual modulus prescaler:
LMX2330L
(RF) 32/33 or 64/65
LMX2331L/32L
(RF) 64/65 or 128/129
LMX2330L/31L/32L (IF) 8/9 or 16/17
n
Selectable charge pump TRI-STATE
®
mode
n
Selectable charge pump current levels
n
Selectable Fastlock
™
mode
n
Upgrade and compatible to LMX233XA family
General Description
The LMX233XL family of monolithic, integrated dual fre-
quency synthesizers, including prescalers, is to be used as a
local oscillator for RF and first IF of a dual conversion trans-
ceiver. It is fabricated using National’s 0.5µ ABiC V silicon
BiCMOS process.
The LMX233XL contains dual modulus prescalers. A 64/65
or a 128/129 prescaler (32/33 or 64/65 in the 2.5 GHz
LMX2330L) can be selected for the RF synthesizer and a 8/9
or a 16/17 prescaler can be selected for the IF synthesizer.
LMX233XL, which employs a digital phase locked loop tech-
nique, combined with a high quality reference oscillator, pro-
vides the tuning voltages for voltage controlled oscillators to
generate very stable, low noise signals for RF and IF local
oscillators. Serial data is transferred into the LMX233XL via
a three wire interface (Data, Enable, Clock). Supply voltage
can range from 2.7V to 5.5V. The LMX233XL family features
very low current consumption;
LMX2330L — 5.0 mA at 3V, LMX2331L — 4.0 mA at 3V,
LMX2332L — 3.0 mA at 3V.
The LMX233XL are available in a TSSOP 20-pin and CSP
24-pin surface mount plastic package.
Applications
n
Portable Wireless Communications
(PCS/PCN, cordless)
n
Cordless and cellular telephone systems
n
Wireless Local Area Networks (WLANs)
n
Cable TV tuners (CATV)
n
Other wireless communication systems
Functional Block Diagram
DS012806-1
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
Fastlock
™
, MICROWIRE
™
and PLLatinum
™
are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS012806
www.national.com
Connection Diagrams
Chip Scale Package (SLB)
(Top View)
Thin Shrink Small Outline Package (TM)
(Top View)
DS012806-2
Order Number LMX2330LTM, LMX2331LTM or
LMX2332LTM
NS Package Number MTC20
DS012806-39
Order Number LMX2330LSLB, LMX2331LSLB or
LMX2332LSLB
NS Package Number SLB24A
Pin Descriptions
Pin No.
LMX233XLSLB
24-pinCSP
Package
24
Pin No.
LMX233XLTM
20-pin TSSOP
Package
1
Pin
Name
V
CC
1
I/O
Description
—
Power supply voltage input for RF analog and RF digital circuits. Input
may range from 2.7V to 5.5V. V
CC
1 must equal V
CC
2. Bypass
capacitors should be placed as close as possible to this pin and be
connected directly to the ground plane.
Power Supply for RF charge pump. Must be
≥
V
CC
.
Internal charge pump output. For connection to a loop filter for driving
the input of an external VCO.
Ground for RF digital circuitry.
RF prescaler input. Small signal input from the VCO.
RF prescaler complementary input. A bypass capacitor should be
placed as close as possible to this pin and be connected directly to the
ground plane. Capacitor is optional with some loss of sensitivity.
Ground for RF analog circuitry.
Oscillator input. The input has a V
CC
/2 input threshold and can be
driven from an external CMOS or TTL logic gate.
Ground for IF digital, MICROWIRE
™
, F
o
LD, and oscillator circuits.
Multiplexed output of the RF/IF programmable or reference dividers,
RF/IF lock detect signals and Fastlock mode. CMOS output
(see
Programmable Modes).
High impedance CMOS Clock input. Data for the various counters is
clocked in on the rising edge, into the 22-bit shift register.
Binary serial data input. Data entered MSB first. The last two bits are
the control bits. High impedance CMOS input.
2
3
4
5
6
2
3
4
5
6
V
P
1
D
o
RF
GND
f
IN
RF
f
IN
RF
—
O
—
I
I
7
8
10
11
7
8
9
10
GND
OSC
in
GND
F
o
LD
—
I
—
O
12
14
11
12
Clock
Data
I
I
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2
Pin Descriptions
Pin No.
LMX233XLSLB
24-pinCSP
Package
15
(Continued)
Pin No.
LMX233XLTM
20-pin TSSOP
Package
13
Pin
Name
LE
I/O
Description
I
Load enable high impedance CMOS input. When LE goes HIGH, data
stored in the shift registers is loaded into one of the 4 appropriate
latches (control bit dependent).
Ground for IF analog circuitry.
IF prescaler complementary input. A bypass capacitor should be placed
as close as possible to this pin and be connected directly to the ground
plane. Capacitor is optional with some loss of sensitivity.
IF prescaler input. Small signal input from the VCO.
Ground for IF digital, MICROWIRE, F
o
LD, and oscillator circuits.
IF charge pump output. For connection to a loop filter for driving the
input of an external VCO.
Power Supply for IF charge pump. Must be
≥
V
CC
.
Power supply voltage input for IF analog, IF digital, MICROWIRE,
F
o
LD, and oscillator circuits. Input may range from 2.7V to 5.5V. V
CC
2
must equal V
CC
1. Bypass capacitors should be placed as close as
possible to this pin and be connected directly to the ground plane.
No connect.
16
17
14
15
GND
f
IN
IF
—
I
18
19
20
22
23
16
17
18
19
20
f
IN
IF
GND
D
o
IF
V
P
2
V
CC
2
I
—
O
—
—
1, 9, 13, 21
X
NC
—
3
www.national.com
Block Diagram
DS012806-3
Note:
The RF prescaler for the LMX2331L/32L is either 64/65 or 128/129, while the prescaler for the LMX2330L is 32/33 or 64/65.
Note:
V
CC
1 supplies power to the RF prescaler, N-counter, R-counter and phase detector. V
CC
2 supplies power to the IF prescaler, N-counter, phase detector,
R-counter along with the OSC
in
buffer, MICROWIRE, and F
o
LD. V
CC
1 and V
CC
2 are clamped to each other by diodes and must be run at the same voltage level.
Note:
V
P
1 and V
P
2 can be run separately as long as V
P
≥
V
CC
.
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4
Absolute Maximum Ratings
2)
(Notes 1,
Recommended Operating
Conditions
Power Supply Voltage
V
CC
V
P
Operating Temperature (T
A
)
2.7V to 5.5V
V
CC
to +5.5V
−40˚C to +85˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Supply Voltage
V
CC
V
P
Voltage on Any Pin
with GND = 0V (V
I
)
Storage Temperature Range (T
S
)
Lead Temperature (solder 4 sec.) (T
L
)
−0.3V to +6.5V
−0.3V to +6.5V
−0.3V to V
CC
+0.3V
−65˚C to +150˚C
+260˚C
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Recommended Operating Conditions indicate condi-
tions for which the device is intended to be functional, but do not guarantee
specific performance limits. For guaranteed specifications and test condi-
tions, see the Electrical Characteristics. The guaranteed specifications apply
only for the test conditions listed.
Note 2:
This device is a high performance RF integrated circuit with an ESD
rating
<
2 keV and is ESD sensitive. Handling and assembly of this device
should only be done at ESD protected work stations.
Electrical Characteristics
V
CC
= 3.0V, V
P
= 3.0V; −40˚C
<
T
A
<
85˚C, except as specified
Symbol
I
CC
Power
Supply
Current
Parameter
LMX2330L RF + IF
LMX2330L RF Only
LMX2331L RF + IF
LMX2331L RF Only
LMX2332L IF + RF
LMX2332L RF Only
LMX233xL IF Only
I
CC-PWDN
Powerdown Current
f
IN
RF
Operating
Frequency
f
IN
IF
f
OSC
f
φ
Pf
IN
RF
Pf
IN
IF
V
OSC
V
IH
V
IL
I
IH
I
IL
I
IH
I
IL
V
OH
V
OL
t
CS
t
CH
t
CWH
t
CWL
Operating
Frequency
Oscillator Frequency
Maximum Phase Detector
Frequency
RF Input Sensitivity
IF Input Sensitivity
Oscillator Sensitivity
High-Level Input Voltage
Low-Level Input Voltage
High-Level Input Current
Low-Level Input Current
Oscillator Input Current
Oscillator Input Current
High-Level Output Voltage
(for F
o
LD, pin number 10)
Low-Level Output Voltage (for
F
o
LD, pin number 10)
Data to Clock Set Up Time
Data to Clock Hold Time
Clock Pulse Width High
Clock Pulse Width Low
5
Conditions
V
CC
= 2.7V to 5.5V
Value
Min
Typ
5.0
4.0
4.0
3.0
3.0
2.0
1.0
Max
6.6
5.2
5.4
4.0
4.1
2.7
1.4
10
2.5
2.0
1.2
510
40
Units
mA
(Note 3)
LMX2330L
LMX2331L
LMX2332L
LMX233xL
0.5
0.2
0.1
45
5
10
V
CC
= 3.0V
V
CC
= 5.0V
V
CC
= 2.7V to 5.5V
OSC
in
(Note 4)
(Note 4)
V
IH
= V
CC
= 5.5V
(Note 4)
V
IL
= 0V, V
CC
= 5.5V
(Note 4)
V
IH
= V
CC
= 5.5V
V
IL
= 0V, V
CC
= 5.5V
I
OH
= −500 µA
I
OL
= 500 µA
See Data Input Timing
See Data Input Timing
See Data Input Timing
See Data Input Timing
50
10
50
50
−15
−10
−10
0.5
0.8 V
CC
1
µA
GHz
MHz
MHz
MHz
0
0
0
dBm
dBm
dBm
V
PP
V
0.2 V
CC
−1.0
−1.0
1.0
1.0
100
−100
V
CC
− 0.4
0.4
V
µA
µA
µA
µA
V
V
ns
ns
ns
ns
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