BU2374FV Datasheet, PDF (3/8 Pages) Rohm – VCO + phase comparator IC for PLL system

Multimedia ICs
!Pin descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Pin name
LOGIC VDD
SELECT
VCO OUT
FIN-A
FIN-B
PFD_OUT
LOGIC_GND
TEST
PFD_INHIBIT
VCO_INHIBIT
VCO_GND
VCO_IN
13
BIAS
14
VCO_VDD
BU2374FV
Functions
Digital VDD
VCO output frequency select (H:1/4 output, L:1/1 output)
VCO output
Input reference frequency is applied to Fin A
Input for VCO external counter output frequency
PD output
Digital GND
TEST input with Pull-down resistor (Normaly OPEN or 'L')
Contorol Pin for PD (H:PD disable (Hi impedance state), L:PD enable)
VCO mode select (H:VCO OUT disable (L Fix), L:VCOOUT enable)
GND for VCO (Analog GND)
VCO control voltage input
For adjusting VCO output frequency range
(An external resistor connect between VCO_VDD and BIAS)
VDD for VCO (Analog VDD)
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