參數(shù)資料
型號： LMX3161VBHX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 無繩電話/電話
英文描述： Single Chip Radio Transceiver
中文描述： TELECOM, CORDLESS, SUPPORT CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, QFP-48
文件頁數(shù)： 10/14頁
文件大?。?/td> 212K
代理商： LMX3161VBHX
Transmitter Functional Description
The simplified block diagram below shows the doubler and voltage regulator for an external transmit gain stage.
Function Register Programming Description (F-Latch)
If the control bits are “1X”, data is transferred from the 20-bit shift register into the 18-bit F-latch. Serial data format is shown
below.
MSB
19
REGISTER’S BIT MAPPING
12
11
10
MODE CONTROL WORD
F12
F11
F10
LSB
18
17
16
15
14
13
9
8
7
6
5
4
3
2
1
0
C2
X
C1
1
F18
F17
F16
F15
F14
F13
F9
F8
F7
F6
F5
F4
F3
F2
F1
Note:
X = Don’t Care Condition
Various modes of operation can be programmed with the function register bits F1–F18, including the phase detector polarity,
charge pump TRI-STATE
and CMOS outputs. In addition, software or hardwire power down modes can be specified with bits
F11 and F12.
Mode
Control
Bit
F1
F2
Model Control Description
Setting to
“0” to Select
Setting to
“1” to Select
Prescaler modules select.
Phase detector polarity.
It is used to reverse the polarity of
the phase detector according to the VCO characteristics.
Charge pump current gain select.
32/33
64/65
Negative VCO
Characteristics
LOW Charge Pump
Current (1X I
cpo
).
Normal Operation
—
Power Up RX Chain
Positive VCO
Characteristics
HIGH Charge Pump
Current (4X I
cpo
).
Force to TRI-STATE
—
Power Down RX Chain
F3
F4
F5
F6
TRI-STATE charge pump output.
Reserved.
Setting to “0” always.
Receive chain power down control.
Software power down
can only be activated when both F11 and F12 are set to “0”.
Transmit chain power down control.
Software power down
can only be activated when both F11 and F12 are set to “0”.
Out 0 CMOS output.
Out 1 CMOS output.
Functions only in software power down
mode, when both F11 and F12 are set to “0”.
Out 2 CMOS output.
Functions only in software power down
mode, when both F11 and F12 are set to “0”.
Power down mode select.
Set both F11 and F12 to “0” for software power down mode.
Set both F11 and F12 to “1” for hardwire power down mode.
Other combinations are reserved for test mode.
Demodulator gain select
Demodulator DC level shift +/ level shifting polarity
F7
Power Up TX Chain
Power Down TX Chain
F8
F9
OUT 0 = LOW
OUT 1 = LOW
OUT 0 = HIGH
OUT 1 = HIGH
F10
OUT 2 = LOW
OUT 2 = HIGH
F11
F12
Software
Power Down
Hardware
Power Down
F13
F14
1X Gain Mode
Set Negative Polarity
3X Gain Mode
Set Positive Polarity
DS012815-6
The transmitter can be powered down, either by hardware through the Tx PD pin, or by software through the programming of F7 bith in F-Latch. The
Note:
L
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