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IMI145152QB Datasheet

  • IMI145152QB

  • Parallel-Input Frequency Synthesizer

  • 12頁

  • ETC

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IMI145152
February 1996
FREQUENCY SYNTHESIZER
CMOS LSI
PARALLEL TUNING PLL FREQUENCY SYNTHESIZER
PRODUCT DESCRIPTION
The IMI145152 is a member of a family of phase lock loop
synthesizer Ics from International Microcicruicts. This part is
pin-for-pin compatible with the Motorola MC145152 series of
parts. The IMI145152 is an improved version of this device,
and designing to take advantage of these improvements will
provide a synthesizer with noticeably improved performance.
The IMI145152 is programmed with parallel input data lines.
Since it does not require a microcontroller as serial and bus
programming units do, the IMI145152 is an excellent choice
for synthesizers requiring independence from digital
controllers. Such applications particularly include fixed local
oscillator signals, who tuning never changes, and signal
sources, which have few operating frequencies.
Blocks in the IMI145152 include a dual modulus feedback
divider for use with an external dual modulus prescaler.
Prescaler ratios can very from 3/4 through 64/65. The
reference divider is set by three select lines to one of eight
ROM encloded values. Both counter inputs are biased for
high sensitivity to sinewave input signals, and the reference
divider input is also configured to operate as an oscillator if
desired. The phase detector is a Type IV phase-frequency
design, which has inherently eliminated the dead zone and
indeed any crossover distortion, as is often noticed on other
PLL devices.
Performance improvements are in the operating
and phase detector noise floor. With its extremely
noise floor and wider input bandwidth, prescaler
be minimized to allow wide loop bandwidths
settlign and lower phase noise.
bandwidth
low phase
ratios can
for faster
PRODUCT FEATURES
忙
忙
忙
忙
忙
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> 150 Mhz typical input frequency
-163 dBc/Hz total phaswe noise floor
No dead zone, by design
Unambiguous PLL acquisition
Parrallel programming, dual modulus PLL
8 user-selectable reference divider ratios: 8, 64,
128, 256, 512, 1024, 1160, and 2048
Lock detect signal
Compatible with dual-modulus prescalers from
梅3/4
to
梅64/65
10-bit N counter, 6-bit A counter
On- or off-chip reference oscillator operation
3-volt and 5-volt characterizations
BLOCK DIAGRAM
RA2
RA1
RA0
6
5
4
12 x 8 ROM REFERENCE DECODER
LOCK
DETECT
28
LD
OSCin
27
12 BIT /R COUNTER
PHASE DETECTOR
8
7
PHIV
PHIR
OSCout
26
CONTROL LOGIC
FIN
1
9
6 BIT /A COUNTER
10 BIT /N COUNTER
MODULUS CONTROL
10
A5
25
A4
24
A3
22
A2
21
A1
23
A0
11
N0
12
N1
13
N2
14
N3
15
16
17
18
19
N8
20
N9
VDD = PIN 3
VSS = PIN 2
N4 N5
N6 N7
Note: N0 through N9 have pullup resistors not shown.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 1 of 12

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