SX1223 데이터 시트보기 (PDF) - Semtech Corporation
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SX1223 Datasheet PDF : 25 Pages
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SX1223
Add Bit XCO_quick_start XCO_high_current Comments
2 4-3
0
0
Normal XCO bias current (default)
0
1
Higher XCO bias current
1
0
Quick start of XCO with normal bias current in steady state
1
1
Quick start of XCO with higher bias current in steady state
Table 15: XCO start-up control
Add Bit
13
LDO_en
0
1
Comments
LDO turned off, min/max VDD is 2.0/2.5 V
LDO turned on, min/max VDD is 2.2/3.6 V (default)
Table 16: Low DropOut voltage regulator on/off
Add Bit OL_opamp_en State
Comments
12
0
Open loop opamp off When opamp is enabled, a capacitor can be
Open loop opamp on added to the varactor pin that will increase the
1
(default)
transmission time in open loop modulation (mw2)
Table 17: Open loop opamp on/off
Add Bit
25
PA_C
0
1
Comments
Startup time of PA controlled by internal capacitor; PTAT source using the
resistor connected to pin6 can be used (default)
Startup time of PA controlled by external capacitor connected to pin 6; PTAT
source using the resistor connected to pin6 is not available
Table 18: PA start-up control
Add Bit PALDc_en Comments
11
0
PA is only controlled by Mode1 and Mode0: PA on in transmit mode
(Mode1=Mode0=1) (default)
1
In transmit mode, PA is turned on/off by Lock Detect (i.e. LD=1 -> PA on)
Table 19: Lock Detect controlled PA
Add Bit
10
LD_en
0
1
State
LD off
LD on
Comments
Output is low
A high indicate a PLL lock (default)
Table 20: Lock Detector
Add Bit
22
CP_HI
0
1
Comments
PLL charge pump current is 125 µA (default)
PLL charge pump current is 500 µA
Table 21: Charge pump current
Add Bits VCO_freq1 VCO_freq0 Comments (*)
2 1-0
0
0
Setting for 850 MHz
0
1
Setting for 868 MHz
1
0
Setting for 915 MHz (default)
1
1
Setting for 950 MHz
(*) Assuming FreqBand=1. When FreqBand=0, the RF frequency is halved.
Table 22: VCO frequency
© Semtech 2007
www.semtech.com
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