LMX2522/LMX2532
PLLatinum
TM
Frequency Synthesizer System with
Integrated VCOs
General Description
LMX2522 and LMX2532 are highly integrated, high perfor-
mance, low power frequency synthesizer systems optimized
for Korean PCS (K-PCS) with GPS and Korean Cellular
(K-Cellular) with GPS, CDMA (1xRTT, IS-95) mobile hand-
sets. Using a proprietary digital phase locked loop tech-
nique, LMX2522 and LMX2532 generate very stable, low
noise local oscillator signals for up and down conversion in
wireless communications devices.
LMX2522 and LMX2532 include a RF voltage controlled
oscillator (VCO), a GPS VCO, a loop filter, and a fractional-N
RF PLL based on a delta sigma modulator. In concert these
blocks form a closed loop RF and GPS synthesizer system.
LMX2522 supports the Korean PCS band with GPS and
LMX2532 supports the Korean Cellular band with GPS.
LMX2522 and LMX2532 include an Integer-N IF PLL also.
For more flexible loop filter designs, the IF PLL includes a
4-level programmable charge pump. Together with an exter-
nal VCO and loop filter, LMX2522 and LMX2532 make a
complete closed loop IF synthesizer system.
Serial data is transferred to the device via a three-wire
MICROWIRE interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.7 V to 3.3 V.
LMX2502 and LMX2512 feature low current consumption:
17 mA at 2.8 V.
LMX2522 and LMX2532 are available in a 28-pin leadless
leadframe package (LLP).
Features
n
Small Size
Small 5.0 mm x 5.0 mm x 0.75 mm 28-Pin LLP Package
n
RF/GPS Synthesizer System
Integrated RF VCO
Integrated GPS VCO
Integrated Loop Filter
Low Spurious, Low Phase Noise Fractional-N RF PLL
Based on 11-bit Delta Sigma Modulator
10 kHz Frequency Resolution
n
IF Synthesizer System
Integer-N IF PLL
Programmable Charge Pump Current Levels
Programmable Frequencies
n
Supports Various Reference Oscillator Frequencies
19.20/19.68 MHz
n
Fast Lock Time: 500 s
n
Low Current Consumption
17 mA at 2.8 V
n
2.7 V to 3.3 V Operation
n
Digital Filtered Lock Detect Output
n
Hardware and Software Power Down Control
Applications
n
Korean PCS CDMA Systems with GPS
n
Korean Cellular CDMA Systems with GPS
Functional Block Diagram
20067201
PLLatinum is a trademark of National Semiconductor Corporation.
June 2003
LMX2522/LMX2532
PLLatinum
Dual
Frequency
Synthesizer
System
with
Integrated
VCOs
2003 National Semiconductor Corporation
DS200672
www.national.com
Connection Diagram
28-Pin LLP (LQ) Package
20067202
NOTE: Analog ground connected through exposed die attached pad.
Pin Descriptions
Pin Number
Name
I/O
Description
1
CPout
O
IF PLL charge pump output
2
NC
--
Do not connect to any node on printed circuit board.
3
NC
--
Do not connect to any node on printed circuit board.
4
V
DD
--
Supply voltage for IF analog circuitry
5
LE
I
MICROWIRE Latch Enable
6
CLK
I
MICROWIRE Clock
7
DATA
I
MICROWIRE Data
8
V
DD
--
Supply voltage for VCOs
9
NC
--
Do not connect to any node on printed circuit board.
10
NC
--
Do not connect to any node on printed circuit board.
11
NC
--
Do not connect to any node on printed circuit board.
12
NC
--
Do not connect to any node on printed circuit board.
13
V
DD
--
Supply voltage for VCOs
14
V
DD
--
Supply voltage for VCOs output buffer
15
RFout
O
Buffered VCO output
16
V
CC
--
Supply voltage for RF prescaler
17
V
CC
--
Supply voltage for charge pump
18
V
CC
--
Supply voltage for RF digital circuitry
19
LD
O
Lock Detect
20
CE
I
Chip Enable control pin
21
GND
--
Ground for digital circuitry
22
OSCin
I
Reference frequency input
23
V
CC
--
Supply voltage for reference input buffer
24
GND
--
Ground for digital circuitry
25
V
CC
--
Supply voltage for IF digital circuitry
26
Fin
I
IF buffer/prescaler input
27
V
CC
--
Supply voltage for IF buffer/prescaler
28
NC
--
Do not connect to any node on printed circuit board.
LMX2522/LMX2532
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2
Ordering Information
Part Number
RF Min.
(MHz)
RF Max.
(MHz)
RF Center
(MHz)
IF
(MHz)
GPS
(MHz)
Package
Marking
Supplied As
LMX2522LQX1635
1619.62
1649.62
~1635
440.76
1355.04
25221635
4500 units on
tape and reel
LMX2522LQ1635
1619.62
1649.62
~1635
440.76
1355.04
25221635
1000 units on
tape and reel
LMX2532LQX0967
954.42
979.35
~967
170.76
1490.04
25320967
4500 units on
tape and reel
LMX2532LQ0967
954.42
979.35
~967
170.76
1490.04
25320967
1000 units on
tape and reel
LMX2532LQX1065
1052.64
1077.57
~1065
367.20
1391.82
25321065
4500 units on
tape and reel
LMX2532LQ1065
1052.64
1077.57
~1065
367.20
1391.82
25321065
1000 units on
tape and reel
Part Number Description
20067203
LMX2522/LMX2532
www.national.com
3
Absolute Maximum Ratings
(Notes 1,
2, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Parameter
Symbol
Ratings
Units
Supply Voltage
V
CC
, V
DD
-0.3 to 3.6
V
Voltage on any pin
to GND
V
I
-0. 3 to V
DD
+0.3
V
-0. 3 to V
CC
+0.3
V
Storage Temperature
Range
T
STG
-65 to 150
C
Recommended Operating
Conditions
Parameter
Symbol
Min Typ Max Units
Ambient Temperature
T
A
-30 25
85
C
Supply Voltage (to GND) V
CC
, V
DD
2.7
3.3
V
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, refer to the Electrical Characteristics section. The guaranteed specifi-
cations apply only for the conditions listed.
Note 2: This device is a high performance RF integrated circuit with an ESD
rating
<
2 kV and is ESD sensitive. Handling and assembly of this device
should be done at ESD protected work stations.
Note 3: GND = 0 V.
Electrical Characteristics
(V
CC
= V
DD
= 2.8 V, T
A
= 25 C; unless otherwise noted.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
CC
PARAMETERS
I
CC
+ I
DD
Total Supply Current
OB_CRL [1:0] = 00
17
19
mA
(I
CC
+
I
DD
)
RF
RF PLL Total Supply Current
OB_CRL [1:0] = 00
16
18
mA
I
PD
Power Down Current (Note 4)
CE = Low or
RF_EN = 0
IF_EN = 0
20
A
REFERENCE OSCILLATOR
f
OSCin
Reference Oscillator Input Frequency
(Note 5)
19.20 MHz and 19.68
MHz are supported
19.20
19.68
MHz
V
OSCin
Reference Oscillator Input sensitivity
0.2
V
CC
V
P-P
RF VCO
f
RFout
Frequency Range
(Note 6)
LMX2522LQ1635
RF VCO
1619.62
1649.62
MHz
LMX2532LQ0967
954.42
979.35
MHz
LMX2532LQ1065
1052.64
1077.57
MHz
p
RFout
RF Output Power
OB_CRL [1:0] = 11
-2
1
4
dBm
OB_CRL [1:0] = 10
-5
-2
1
dBm
OB_CRL [1:0] = 01
-7
-4
-1
dBm
OB_CRL [1:0] = 00
-9
-6
-3
dBm
Lock Time (Note 7)
LMX2522LQ1635
30 MHz Band for RF
PLL
500
800
s
LMX2532LQ0967
25 MHz Band for RF
PLL
500
800
s
LMX2532LQ1065
25 MHz Band for RF
PLL
500
800
s
Reference Spurs
-75
dBc
RMS Phase Error
RF PLL in all band
1.3
degrees
L(f)
Phase Noise
LMX2522LQ1635
@
100 kHz offset
-113
-112
dBc/Hz
@
1.25 MHz offset
-138
-136
dBc/Hz
LMX2532LQ0967
@
100 kHz offset
-117
-115
dBc/Hz
@
900 kHz offset
-139
-138
dBc/Hz
LMX2532LQ1065
@
100 kHz offset
-117
-115
dBc/Hz
@
900kHz offset
-139
-138
dBc/Hz
2nd Harmonic Suppression
-25
dBc
3rd Harmonic Suppression
-20
dBc
LMX2522/LMX2532
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4
Electrical Characteristics
(V
CC
= V
DD
= 2.8 V, T
A
= 25 C; unless otherwise noted.) (Continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
GPS VCO
f
RFout
Operating Frequency LMX2522LQ1635
GPS VCO
1355.04
MHz
LMX2532LQ0967
1490.04
MHz
LMX2532LQ1065
1391.82
MHz
p
RFout
Output Power
OB_CRL [1:0] = 11
-2
1
4
dBm
OB_CRL [1:0] = 10
-5
-2
1
dBm
OB_CRL [1:0] = 01
-7
-4
-1
dBm
OB_CRL [1:0] = 00
-9
-6
-3
dBm
Lock Time (Note 7)
From RF to GPS PLL
600
800
s
Reference Spurs
-75
dBc
RMS Phase Error
RF PLL in all band
1.3
degrees
L(f)
Phase Noise
@
100 kHz offset
-113
-112
dBc/Hz
@
1.25 MHz offset
-138
-136
dBc/Hz
2nd Harmonic Suppression
-25
dBc
3rd Harmonic Suppression
-20
dBc
IF PLL
f
Fin
Operating Frequency
(Note 8)
LMX2522LQ1635
IF_FREQ [1:0] = 10,
Default Value
440.76
MHz
LMX2532LQ0967
IF_FREQ [1:0] = 00,
Default Value
170.76
MHz
LMX2532LQ1065
IF_FREQ [1:0] = 01,
Default Value
367.20
MHz
p
Fin
IF Input Sensitivity
-10
0
dBm
f
IF
Phase Detector Frequency
120
kHz
I
CPout
Charge Pump Current
IF_CUR [1:0] = 00
100
A
IF_CUR [1:0] = 01
200
A
IF_CUR [1:0] = 10
300
A
IF_CUR [1:0] = 11
800
A
DIGITAL INTERFACE (DATA, CLK, LE, LD, CE)
V
IH
High-Level Input Voltage
0.8 V
DD
V
DD
V
0.8 V
CC
V
CC
V
V
IL
Low-Level Input Voltage
0
0.2 V
DD
V
0
0.2 V
CC
V
I
IH
High-Level Input Current
-10
10
A
I
IL
Low-Level Input Current
-10
10
A
Input Capacitance
3
pF
V
OH
High-Level Output Voltage
0.9 V
DD
V
0.9 V
CC
V
V
OL
Low-Level Output Voltage
0.1 V
DD
V
0.1 V
CC
V
Output Capacitance
5
pF
LMX2522/LMX2532
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5
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