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PDF AK1545 Data sheet ( Hoja de datos )
| Número de pieza | AK1545 | |
| Descripción | 3.5GHz Low Noise Integer-N Frequency Synthesizer | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK1545]
AK1545
3.5GHz Low Noise Integer-N Frequency Synthesizer
1. Overview
The AK1545 is an Integer-N PLL (Phase Locked Loop) frequency synthesizer, covering a wide range of frequency
from 500MHz to 3.5GHz. Co nsisting of a h ighly accurate charg e pum p, a referenc e di vider, a pro grammable
divider and a dual-modulus prescaler (P/P+1), this product provides high performance, very low Phase Noise. An
ideal PL L can be ach ieved b y comb ining th e AK154 5 with the exter nal l oop filter a nd VCO (Voltage Controlled
Oscillator). Access to the registers is controlled via a 3-wire serial interface. The operating supply voltage is from
2.7V to 5.5V, and the charge pump circuit and the serial interface can be driven by individual supply voltage.
2. Features
Operating frequency :
Programmable charge pump current :
Fast lock mode :
Supply Voltage :
Separate Charge Pump Power Supply :
Excellent Phase Noise :
On-chip lock detection feature of PLL :
Digit
Package :
Operating temperature :
500MHz to 3.5GHz
250μA and 1mA
The charge pump current is switched by this function.
2.7 to 5.5 V (AVDD, DVDD pins)
AVDD to 5.6V (CPVDD pin)
-217dBc/Hz
Selectable P hase F requency D etector (P FD) Output o r
al filtered lock detect
16pin TSSOP
-40°C to 85°C
MS1471-E-00
1
2012/10
http://www.Datasheet4U.com
1 page  
2. Pin Assignments
SW 1
CP 2
VSS
3
TEST1 4
RFINN 5
RFINP 6
AVDD 7
REFIN 8
16 CPVDD
15 DVDD
TOP
VIEW
14 LD
13 LE
12 DATA
11 CLK
10 PDN
9 TEST2
16pin TSSOP
Fig. 2 Pin Assignment
[AK1545]
MS1471-E-00
5
2012/10
5 Page 
[AK1545]
8. Block Functional Descriptions
1. Frequency Setup
The following formula is used to calculate the frequency setting for the AK1545.
Frequency setting (external VCO output frequency) = FPFD x N
Where :
N
FPFD
P
B
A
: Dividing number N = [ (P x B) + A ]
: Phase detector frequency FPFD = [REFIN] pin input frequency / R counter dividing number
: 32
: B (Programmable) counter value (See <Address1>:{B[12:0]})
: A (Swallow) counter value (See <Address1>:{A[4:0]})
Calculation example
The output frequency of external reference frequency oscillator is 10MHz, and FPFD is 1MHz and VCO
frequency is 3000MHz.
AK1545 setting :
R (Reference counter) =10000000/1000000 = 10 (<Address0>:{R[13:0]}= “10”)
P=32
B=93 (<Address1>:{B[12:0]}=”93”)
A=24 (<Address1>:{A[4:0]}=”24”)
Frequency setting = 1M × [ (32×93) + 24] = 3000MHz
Lower limit for setting consecutive dividing numbers
In the AK1545, it is not possible to set consecutive dividing numbers below the lower limit.
(The lower limit is determined by a dividing number set for the prescaler.)
The following table shows an example where consecutive dividing numbers below the lower limit cannot be set.
The consecutive dividing numbers can be set when B ≥ P-1.
MS1471-E-00
11
2012/10
11 Page | ||
| Páginas | Total 39 Páginas | |
| PDF Descargar | [ Datasheet AK1545.PDF ] | |
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