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PDF IMI145151 Data sheet ( Hoja de datos )
| Número de pieza | IMI145151 | |
| Descripción | Frequency Synthesizer | |
| Fabricantes | International Microcircuits | |
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IMI145151
FREQUENCY SYNTHESIZER
CMOS LSI
PARALLEL PROGRAMMED PLL FREQUENCY SYNTHESIZER
PRODUCT DESCRIPTION
PRODUCT FEATURES
The IMI145151 is a member of a family of phaselock loop synthesizer
ICs from International Microcircuits. The IMI145151 is an improved
T >200 Mhz typical input frequency.
version of the Motorola MC145151 and will provide a synthesizer with
noticeably improved performance.
The IMI145151 is programmed with parallel input data lines. Since it
T -163 dBc/Hz total phase noise floor.
does not require a microcontroller as serial and bus programmed units
do, the IMI145151 is an excellent choice for synthesizers requiring
Tindependence from digital controllers. Such applications include fixed
local oscillator signals, whose tuning never changes, and signal sources,
which have few operating frequencies.
T mBlocks in the IMI145151 include a programmable feedback divider, a
T oreference divider, phase detector, and charge pump. The reference
divider is programmed by three select lines to one of eight ROM
.cencoded values. Both counter inputs are biased for maximum sensitivity
to sinewave input signals. The reference divider input is also configured
to operate as a crystal oscillator if desired.
T UThe IMI145151 has a Type IV phase frequency detector which has
eliminated by the design the inherent dead zone which causes crossover
T t4distortion at the critical center lock point. the IMI circuitry enables
consistent low noise loop designs using the simple single ended charge
pump output. Differential charge pump outputs are also provided for
those who require a more sophisticated differential active loop filter
T edesign.
ePerformance improvements are in the operating bandwidth and phase
Tdetector noise floor. With its extremely low phase noise foor and wider
hinput bandwith, prescaler ratios can be minimized to allow wide loop
bandwidths for faster settling and lower phase noise.
No dead zone, by design.
Unambiguous PLL acquisition.
8 user-selectable reference divider ratios: 8, 128,
256, 512, 1024, 2048, 2410, 8192.
Lock detect signal.
14 bit N counter. Divider range = 3 to 16383.
On- or off-chip reference oscillator operation.
3-volt and 5-volt characterizations.
SBLOCK DIAGRAM
taRA0 5
aRA1 6
.DRA2 7
OSCin 27
wOSCout 26
wwFin 1
14x8 ROM Reference
Decoder
14 bit /8 Counter
14 bit /N Counter
Lock
Detect
VDD = Pin 3
VSS = Pin 2
28 L D
Phase
Detector A
4 PDout
Phase
9 PHIV
T/R 21
Transmit Offset Adder
Detector B
8 PHIR
23
N13
22 25
24
N12 N11 N10
20
N9
19
N8
18 17 16 15 14 13 12 11
N7 N6 N5 N4 N3 N2 N1 N0
10 fv
NOTE: N0 through N13 inputs have
pullup resistors not shown.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 276 FAX 408-263-6571
Rev 2.0
9/9/97
Page 1 of 7
1 page  
IMI145151
FREQUENCY SYNTHESIZER
CMOS LSI
PARALLEL PROGRAMMED PLL FREQUENCY SYNTHESIZER
2.5
2
1.5
1
0.5
0
3¸
IDDvs VDD
Fin = OSCin = 10MHz
45
6
VDD
-40c
25c
7 85c
Power Consumption vs. Frequency
6
5
4
5 VDC
3
3 VDC
2
1
0
0
10
20 30 40
Operating Frequency (MHz)
PHASE NOISE FLOOR
152/HP 10811A Ref vs 8662 Loop/Residual Noise @ 145 MHZ
(hp) 3018R Carrier: 145.E+6 Hz 8 Nov 1994 13:07:47 - 13:16:37
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-120
-130
-140
-150
-160
-160
-170
10
100
1K
10K 100K 1M
10M
Fosc = 1 Mhz
Fref = 125 Khz
fin = 145 Mhz
N = 1160
Measured floor @ 500 Hz = -102 dBc/Hz
-20 log (N)
= - 61 dB
- 163 dBc/Hz
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 276 FAX 408-263-6571
Rev 2.0
9/9/97
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet IMI145151.PDF ] | |
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