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參數(shù)資料
| 型號(hào)： | LMX2355SLBX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| 封裝： | PLASTIC, CSP-24 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LMX2355SLBX |
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
Function
0
1
OUT_0
IF_N[17]
OUT0 CMOS Output Pin
Level Set
LOW
HIGH
OUT_1
IF_N[18]
OUT1 CMOS Output Pin
Level Set
LOW
HIGH
Test
IF_N[19]
Fractional Test Bit
Normal Operation
No Fractional
Compensation
Fastlock
IF_N[20]
Fastlock Mode Select
CMOS Output
Fastlock Mode
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
IF_NA_CNTR
(A)
2
1
0
00
10
01
71
11
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
Divide
Ratio
11
10
987654321
0
3
00000000001
1
4
00000000010
0
4095
11111111111
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.
LMX2354
www.national.com
16
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