LMX2542LQ2121 NSC [National Semiconductor], LMX2542LQ2121 Datasheet - Page 8

• Manufacturer Part Number: LMX2542LQ2121
• Description: PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
• Manufacturer: NSC [National Semiconductor]

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DIGITAL INTERFACE (CE, DATA, CLK, LE, LD)
V
V
I
I
C
V
V
C
MICROWIRE INTERFACE
t
t
t
t
t
t
IH
IL
CS
CH
CWH
CWL
ES
EW
IH
IL
OH
OL
I
O
Electrical Characteristics
V
Note 4: For other RF frequency ranges, please contact National Semiconductor Corporation.
Note 5: When the Cellular-CDMA mode is used, an external /2 circuit is required before the Cellular mixer LO port. Furthermore, if an external /1.5 circuit is available
before the GPS mixer LO port, the GPS frequency of 1391.82 MHz can be achieved by using a fixed RF frequency of 2087.73 MHz.
Note 6: Lock time is defined as the time difference between the beginning of the frequency transition and the point at which the frequency remains within +/- 1 kHz
of the final frequency. t
Note 7: For frequencies other than the default values, the SPI_DEF bit should be set to 0 and registers R4 and R5 programmed appropriately. Refer to Section
2.2.5 for further details on how to program the SPI_DEF bit.
Note 8: For other reference oscillator frequencies, please contact National Semiconductor Corporation.
Symbol
CC
= V
DD
High-Level Input Voltage
Low-Level Input Voltage
High-Level Input Current
Low-Level Input Current
Input Capacitance
High-Level Output Voltage
Low-Level Output Voltage
Output Capacitance
DATA to CLK Set Up Time
DATA to CLK Hold Time
CLK Pulse Width HIGH
CLK Pulse Width LOW
CLK to LE Set Up Time
LE Pulse Width
= CE = 2.8V, T
LOCK
= t
FINAL
Parameter
A
− t
= +25˚C, unless otherwise specified
INITIAL
.
(Continued)
V
V
IH
IL
= 0V
= V
DD
8
= V
Conditions
CC
0.8 V
0.8 V
0.9 V
0.9 V
50.0
10.0
50.0
50.0
50.0
50.0
Min
−10
0
0
DD
CC
DD
CC
Value
Typ
3.0
0.2 V
0.2 V
0.1 V
0.1 V
Max
V
V
5.0
10
DD
CC
DD
CC
DD
CC
Units
µA
µA
pF
pF
ns
ns
ns
ns
ns
ns
V
V
V
V
V
V
V
V