công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

LMX2370 bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LMX2370
Giải thích chi tiết về linh kiện  PLLatinum??Dual Frequency Synthesizer for RF Personal Communications
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2370 bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI)

Back Button LMX2370 Datasheet HTML 7Page - National Semiconductor (TI) LMX2370 Datasheet HTML 8Page - National Semiconductor (TI) LMX2370 Datasheet HTML 9Page - National Semiconductor (TI) LMX2370 Datasheet HTML 10Page - National Semiconductor (TI) LMX2370 Datasheet HTML 11Page - National Semiconductor (TI) LMX2370 Datasheet HTML 12Page - National Semiconductor (TI) LMX2370 Datasheet HTML 13Page - National Semiconductor (TI) LMX2370 Datasheet HTML 14Page - National Semiconductor (TI) LMX2370 Datasheet HTML 15Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
2.0 Programming Description (Continued)
2.3.5 PLL Prescaler Select (P_Aux, P_Main)
The LMX2370, LMX2371 and LMX2372 contain two dual modulus prescalers. A 32/33 or a 16/17 prescaler can be selected for
the 2.5 GHz and 2.0 GHz RF synthesizers in the LMX2370 and LMX2371 respectively. The 16/17 prescaler is only rated for input
frequencies below 1.2 GHz. A 16/17 or an 8/9 prescaler can be selected for the both 1.2 GHz synthesizers on the LMX2372 as
well as the 1.2 GHz synthesizers on the LMX2370 and LMX2371. The 8/9 prescaler is only rated for input frequencies below
550 MHz.
Prescaler Value
P_Main, (Main_N18) or
P_Aux (Aux_N18)
2.5 GHz PLL
2.0 GHz PLL
1.2 GHz PLL
0
16/17
16/17
8/9
1
32/33
32/33
16/17
Allowable Prescaler Values
PLL Input Frequency
2.5 GHz PLL
2.0 GHz PLL
1.2 GHz PLL
f
IN > 1.2 GHz
32/33
32/33
NA
550 < f
IN < 1200 MHz
16/17 or 32/33
16/17 or 32/33
16/17
f
IN < 550 MHz
16/17 or 32/33
16/17 or 32/33
8/9 or 16/17
2.3.5.1 Pulse Swallow Function
f
VCO = [(P xB)+ A]xfOSC/R
f
VCO:
Output frequency of external voltage controlled oscillator (VCO)
B:
Preset divide ratio of binary 13-bit programmable counter (3 to 8191)
A:
Preset divide ratio of binary 5-bit swallow counter
0
≤ A ≤ 31 {P=32}
0
≤ A ≤ 15 {P=16}
0
≤ A ≤ 7{P=8}
A
≤ B
f
OSC:
Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)
P:
Preset modulus of dual modulus prescaler (P = 8, 16, or 32)
2.3.6 PLL Power Down Control (Aux_PWDN, Main_PWDN)
The Aux_PWDN (Aux_N19) and Main_PWDN (Main_N19) bits are used to power down either the Main or Auxiliary PLL’s charge
pump portion, or the entire PLL block depending on the setting of the respective charge pump TRI-STATE bit (Aux_CP
o_TRI or
Main_CP
o_TRI) in the R_CNTR register. The power-down mechanism is described below. The R and N counters for each respec-
tive PLL are disabled and held at reset during the synchronous and asynchronous power down modes. This will allow a smooth
acquisition of the Main RF signal when the oscillator input buffer is still active (Auxiliary loop powered up) and vice versa. Upon
powering up, both R and N counters will start at the “zero” state, and the relationship between R and N will not be random.
Synchronous Power Down Mode
One of the PLL loops can be synchronously powered down by first setting the respective loop’s TRI-STATE mode bit LOW (R17
= 0) and then asserting its power down mode bit (N19 = 1). The power down function is gated by the charge pump. Once the
power down program bits Aux_PWDN (Aux_N19) and Main_PWDN (Main_N19) and TRI-STATE bits Aux_CP
o_TRI (Aux_R17)
or Main_CP
o_TRI (Main_R17) are loaded, the part will go into power down mode upon the completion of a charge pump pulse
event.
Asynchronous Power Down Mode
One of the PLL loops can be asynchronously powered down by first setting the respective loop’s TRI-STATE mode bit HI (R17
= 1) and then asserting its power down mode bit (N19 = 1). The power down function is NOT gated by the charge pump. Once
the power down program bits Aux_PWDN (Aux_N19) and Main_PWDN (Main_N19) and its respective TRI-STATE bit Aux_CP
o-
_TRI (Aux_R17) or Main_CP
o_TRI (Main_R17) are loaded, the part will go into power down mode immediately.
www.national.com
11


Số phần tương tự - LMX2370

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
National Semiconductor ...
LMX2377U NSC-LMX2377U Datasheet
3Mb / 44P
   PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2377USLBX NSC-LMX2377USLBX Datasheet
3Mb / 44P
   PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2377USLEX NSC-LMX2377USLEX Datasheet
3Mb / 44P
   PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2377UTM NSC-LMX2377UTM Datasheet
3Mb / 44P
   PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2377UTMX NSC-LMX2377UTMX Datasheet
3Mb / 44P
   PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
More results

Mô tả tương tự - LMX2370

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
National Semiconductor ...
LMX2335 NSC-LMX2335 Datasheet
393Kb / 18P
   PLLatinum??Dual Frequency Synthesizer for RF Personal Communications
LMX2330A NSC-LMX2330A Datasheet
392Kb / 17P
   PLLatinum??Dual Frequency Synthesizer for RF Personal Communications
LMX2346 NSC-LMX2346 Datasheet
606Kb / 27P
   PLLatinum??Frequency Synthesizer for RF Personal Communications
logo
Texas Instruments
LMX2335 TI-LMX2335 Datasheet
437Kb / 19P
[Old version datasheet]   PLLatinum Dual Frequency Synthesizer for RF Personal Communications
LMX2430 TI1-LMX2430_14 Datasheet
4Mb / 48P
[Old version datasheet]   PLLatinum??Dual High Frequency Synthesizer for RF Personal Communications
logo
National Semiconductor ...
LMX2430 NSC-LMX2430 Datasheet
943Kb / 49P
   PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2335L NSC-LMX2335L Datasheet
542Kb / 22P
   PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2330L NSC-LMX2330L Datasheet
496Kb / 21P
   PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2306 NSC-LMX2306_04 Datasheet
338Kb / 19P
   PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications
LMX2323 NSC-LMX2323 Datasheet
185Kb / 12P
   PLLatinum 2.0 GHz Frequency Synthesizer for RF Personal Communications
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com