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AK1545 Schematic ( PDF Datasheet ) - AKM

Teilenummer AK1545
Beschreibung 3.5GHz Low Noise Integer-N Frequency Synthesizer
Hersteller AKM
Logo AKM Logo 




Gesamt 39 Seiten
AK1545 Datasheet, Funktion
[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






AK1545 Datasheet, Funktion
[AK1545]
5. Absolute Maximum Ratings
Table 2 Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Unit
Remarks
Supply Voltage
VDD1
VDD2
-0.3 6.5 V [AVDD], [DVDD] (Note 1)
-0.3 6.5 V [CPVDD] (Note 1)
Ground Level
Analog Input Voltage
Digital Input Voltage
Input Current
Storage Temperature
VSS
VAIN
VDIN
IIN
Tstg
0 0 V [VSS]
VSS-0.3 VDD1+0.3 V [RFINN], [RFINP], [REFIN] (Notes 1 & 2)
VSS-0.3 VDD1+0.3 V [CLK], [DATA], [LE], [PDN] (Notes 1 & 2)
-10 10 mA
-55 125 °C
Note 1) 0V reference for all voltages.
Note 2) Maximum must not be over 6.5V.
Exceeding these maximum ratings may result in damage to the AK1545. Normal operation is not guaranteed at
these extremes.
6. Recommended Operating Range
Table 3 Recommended Operating Range
Parameter
Symbol Min. Typ. Max. Unit
Remarks
Operating Temperature
Supply Voltage
Ta
VDD1
VDD2
-40
2.7
VDD1
85 °C
5.5 V Applied to the [AVDD],[DVDD] pins
5.6 V Applied to the [CPVDD] pin
Note 1)
Note 2)
VDD1 and VDD2 can be driven individually within the Recommended Operating Range.
All specifications are applicable within the Recommended Operating Range (operating temperature /
supply voltage).
MS1471-E-00
6
2012/10

6 Page









AK1545 pdf, datenblatt
[AK1545]
P=32 (Dual modulus prescaler 32/33)
P B[12:0] A[5:0] N [ (P×B) + A ]
Remarks
32 30 30
32 31
0
990 991 cannot be set as an N divider.
This is the lower limit.
992 992 or over can consecutively be set as an N divider.
32 31
1
993
・・・
32 4097
15
131119
・・・
32 8191
30
262142
32 8191
31
262143
MS1471-E-00
12
2012/10

12 Page





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