LMX9820ASMX/NOPB National Semiconductor, LMX9820ASMX/NOPB Datasheet - Page 21

• Manufacturer Part Number: LMX9820ASMX/NOPB
• Description: MODULE BLUETOOTH SERIAL PORT SMD
• Manufacturer: National Semiconductor

Specifications of LMX9820ASMX/NOPB

• Frequency: 2.4GHz
• Data Rate - Maximum: 704kbps
• Modulation Or Protocol: Bluetooth v1.1, Class 2
• Applications: PDA's, POS Terminals
• Power - Output: 1dBm
• Sensitivity: -81dBm
• Voltage - Supply: 2.85 V ~ 3.6 V
• Current - Receiving: 65mA
• Current - Transmitting: 68mA
• Data Interface: PCB, Surface Mount
• Memory Size: 256Kb Flash
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 116-LTCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX9820ASMX; LMX9820ASMXTR

8.0 Digital Smart Radio
8.7.2 TCXO (Temperature Compensated Crystal
Oscillator)
The LMX9820A also can operate with an external TCXO
(Temperature Compensated Crystal Oscillator). The TCXO
signal is directly connected to the CLK+.
1. Input Impedance
The LMX9820A CLK+ pin has in input impedance of 2 pF
capacitance in parallel with >400k resistance.
V
I
f
V
DDACT
DD
PPOSC
Symbol
Supply Voltage
Supply Current (Active)
Nominal Output Frequency
Oscillating Amplitude
Duty Cycle
Parameter
(Continued)
Table 23. 32.768 kHz Oscillator Specifications
Condition
21
8.7.3 Optional 32 kHz Oscillator
A second oscillator is provided (see Figure 13) that is tuned
to provide optimum performance and low-power consump-
tion while operating with a 32.768 kHz crystal. An external
crystal clock network is required between the 32kHz_CLKI
clock input (pad B13) and the 32kHz_CLKO clock output
(pad C13) signals.The oscillator is built in a Pierce configu-
ration and uses two external capacitors. Table 23 provides
the oscillator’s specifications.
In case the 32Khz is placed optionally, it is recommended
to remove C2 and replace C1 with a zero ohm resistor.
32.768 kHz
1.62
Min
Figure 13. 32.768 kHz Oscillator
40
C1
C2
32.768
Typ
1.8
1.8
2
Max
1.98
32kHz_CLKI
32kHz_CLKO
GND
60
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Unit
kHz
µA
%
V
V