Datenblatt-pdf.com


AK1542A Schematic ( PDF Datasheet ) - AKM

Teilenummer AK1542A
Beschreibung 20 to 600MHz Integer-N Frequency Synthesizer
Hersteller AKM
Logo AKM Logo 




Gesamt 37 Seiten
AK1542A Datasheet, Funktion
[AK1542A]
AK1542A
20 to 600MHz Integer-N Frequency Synthesizer
1. Overview
Consisting a highly accurate charge pump that supports current adjustment in 9 steps, a reference divider, a programmable
divider and a dual-modulus prescaler (P/P+1), the AK1542A provides high performance, low consumption current and small
footprint for a wide range of frequency conversions . This synthesizer also has two general-purpose output pins which allow it
to be used to control the RF front end.
An ideal Phase Locked Loop (PLL) can be achieved by combining the AK1542A with the external loop filter and VCO (Voltage
Controlled Oscillator). Access to the registers is controlled via a 3-wire serial interface. The operating supply voltage is from
2.7 to 5.5V; and the supply voltage for the charge pump and that for the serial interface can be driven separately.
2. Features
Operating frequency:
20 to 600MHz
Programmable charge pump current:
158 to 2528A typical
The charge pump current can be changed in 9 steps; and the current
range can be adjusted by the external resistance.
Two current settings can be specified with the register and switched
over from one to another using the timer.
Supply Voltage:
2.7 to 5.5 V (PVDD pin)
Separate power supply for the charge pump: PVDD to 5.5V (CPVDD pin)
On-chip power-saving features
On-chip lock detection feature of PLL:
Direct output to the PFD (Phase frequency detector)
or digital filtering output can be selected.
General-purpose output:
It has two general-purpose output ports to control peripheral parts.
Very low consumption current:
2.2mA typical
Package:
24pin QFN (0.5mm pitch, 4mm4mm0.75mm)
Operating temperature:
-40C to 85C
MS1399-E-00
-1-
2012/3
http://www.Datasheet4U.com






AK1542A Datasheet, Funktion
[AK1542A]
5. Absolute Maximum Ratings
Table 2 Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Unit
Remarks
Supply Voltage
VDD1
VDD2
-0.3 6.5 V Note 1), Applied to [PVDD] pin
-0.3 6.5 V Note 1), Applied to [CPVDD] pin
VSS1
0 0 V Voltage ground level, applied to [PVSS] pin
Ground Level
VSS2
0 0 V Voltage ground level, applied to [CPVSS] pin
VSS3
0 0 V Voltage ground level, applied to [DVSS] pin
Analog Input Voltage
VAIN1
VAIN2
VSS1-0.3 VDD1+0.3 V Notes 1) & 2)
VSS2-0.3 VDD2+0.3 V Notes 1) & 3)
Digital Input Voltage VDIN
VSS3-0.3 VDD1+0.3 V Notes 1) & 4)
Input Current
IIN
-10 10 mA
Storage Temperature Tstg
-55 125 °C
Note 1) 0V reference for all voltages.
Note 2) Applied to [REFIN], [RFINN] and [RFINP] pins.
Note 3) Applied to [CPZ] and [SWIN] pins.
Note 4) Applied to [CLK], [DATA], [LE], [PDN1], [PDN2], [TEST1], [TEST2] and [TEST3] pins.
Exceeding these maximum ratings may result in damage to the AK1542A. 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 Ta
-40
85 C
Supply Voltage
VDD1
VDD2
2.7
VDD1
3.3
5.0
5.5
5.5
V Applied to [PVDD] pin
V Applied to [CPVDD] pin
Note 1) VDD1 and VDD2 can be driven individually within the recommended operating range.
The specifications are applicable within the recommended operating range (supply voltage /operating temperature).
MS1399-E-00
-6-
2012/3

6 Page









AK1542A pdf, datenblatt
[AK1542A]
2. Charge Pump and Loop Filter
In AK1542A, the fast Lock Up could be achieved by changing a charge pump current and enabling the loop filter. This is
called Fast Lock Up mode. For details, see ”3. Fast Lock Up Mode” on page 13.
The loop filter is external and connected to [CP], [SWIN] and [CPZ] pins. The [CPZ] pin should be connected to the R2 and
C2, which are intermediate nodes, even if the Fast Lock Up is not used. Therefore, R2 must be connected to the [CP] pin,
while C2 must be connected to the ground.
Phase Detector
up
down
Timer
Loop Filter
CP R3
C1 R2'
R2
C3
VCO
SWIN
CPZ
C2
Fig. 5 Loop Filter Schematic
MS1399-E-00
- 12 -
2012/3

12 Page





SeitenGesamt 37 Seiten
PDF Download[ AK1542A Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AK1542A20 to 600MHz Integer-N Frequency SynthesizerAKM
AKM

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche