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參數(shù)資料
| 型號： | LMX2355TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 16/23頁 |
| 文件大小： | 403K |
| 代理商： | LMX2355TM |
Programming Description
(Continued)
5.1.2 CMOS (Programmable CMOS outputs)
(IF_N[17]–IF_N[20])
MSB
LSB
FastLock
TEST
OUT_1
OUT_0
Note:
Test bit is reserved and should be set to zero for normal usage.
5.1.3 Programmable CMOS Output Truth Table
Bit
Location
IF_N[17]
Function
0
1
OUT_0
OUT0 CMOS Output Pin
Level Set
OUT1 CMOS Output Pin
Level Set
Fractional Test Bit
LOW
HIGH
OUT_1
IF_N[18]
LOW
HIGH
Test
IF_N[19]
Normal Operation
No Fractional
Compensation
Fastlock Mode
Fastlock
IF_N[20]
Fastlock Mode Select
CMOS Output
Test
Bit IF_N[19] controls the fractional spur compensation and should be set to 0 for normal operation. If the test bit is set to 1,
then the fractional spurs become much worse, but the phase noise improves about 5 dB.
When the
Fastlock
bit is set to 1,
OUT_0
and
OUT_1
are don’t care bits. Fastlock mode utilizes the OUT0 and OUT1 output pins
to synchronously switch between active low and TRI-STATE. The OUT0 = LOW state occurs whenever the RF loop’s CP_8X is
selected HIGH while the Fastlock bit is set HIGH (see programming description 4.2.2). The OUT0 pin reverts to TRI-STATE when
the CP_8X bit is LOW. Similarly for the IF loop, the synchronous activation of OUT1 = LOW or TRI-STATE, is dependent on
whether the CP_GAIN_8 is high or low respectively (see programming description 4.1.4).
5.1.4 3-BIT IF SWALLOW COUNTER DIVIDE RATIO (IF A COUNTER)
(IF_N[2]IF_N[4])
Swallow Count
(A)
0
1
7
IF_NA_CNTR
1
0
0
1
2
0
0
1
0
0
1
1
Note:
Swallow Counter Value: 0 to 7
IF_NB_CNTR
≥
IF_NA_CNTR
Minimum continuous count = 56 ( A=0, B=7)
5.1.5 12-BIT IF PROGRAMMABLE COUNTER DIVIDE RATIO (IF B COUNTER)
(IF_N[5]–IF_N[16])
IF_NB_CNTR
6
Divide
Ratio
3
4
4095
11
10
9
8
7
5
4
3
2
1
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
1
0
1
1
0
1
Note:
Divide ratio: 3 to 4095 (Divide ratios less than 3 are prohibited)
IF_NB_CNTR
≥
IF_NA_CNTR
N divider continuous integer divide ratio 56 to 32,767.
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