TB2118F 데이터 시트보기 (PDF) - Toshiba

부품명

상세내역

제조사

TB2118F

High Speed PLL For DTS (Bi−CMOS Integrated Circuit Silicon Monolithic)

Toshiba 

TB2118F

4. Control of phase comparator and charge pumps

The phase comparator compares the phase difference between the reference frequency signal (fREF) and the

programmable counter divisor output (fSIG) and outputs the result.

The constant current driver block outputs phase error signals as a current.

1) Setting charge pumps and op-amps (OPSEL)

The OPSEL bit is used to select a charge pump and an op-amp.

OPSEL

0

1

Charge Pump (CP) Output

DOFM

DOAM

2) Setting current value (CRO)

● AM / FM = "1" (AMIN input)

CR1 CR0

AM CP Out Output Current

0

0

0

1

±0.3mA

±0.5mA

Op-Amp

FM amp

AM amp

AM CP Output

FM CP Output

Hz

DO

DO

Hz

Hz = high impedance

DO = tri-state output

● AM / FM = "0" (FMIN input)

CR1 CR0

FM CP Out Output Current

0

0

1

0

±250µA

±5mA

3) Connection example (the filter circuit is an example for reference. Check and design depending on the desired

characteristics for your set.)

AM

CP OUT

20

100 pF

0.47 µF 15 kΩ

VT 19

VT

0.047 µF 3.3 kΩ

FM

CP OUT

18

8200 pF

11

2002-10-30

Share Link: