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PDF BU2616 Data sheet ( Hoja de datos )
| Número de pieza | BU2616 | |
| Descripción | PLL frequency synthesizer for tuners | |
| Fabricantes | ROHM Semiconductor | |
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Audio ICs
PLL frequency synthesizer for tuners
BU2616F
BU2616F PLL frequency synthesizers work up through the FM band.
Featuring low power dissipation and highly sensitive built-in RF amps, they detect intermediate frequencies.
FApplications
Tuners (Mini components, radio cassette players, radio
equipment, etc.)
FFeatures
1) Built-in high-speed prescaler can divide 130MHzVCO.
2) Low current dissipation (during operation: 6mA PLL
OFF: 1mA)
3) In addition to the standard FM and AM, also offers the
following 7 frequencies: 25kHz, 12.5kHz, 6.25kHz,
10kHz, 9kHz, 5kHz, and 1kHz.
4) SD (station detector) input circuit.
5) Intermediate frequency detection circuit
6) Charge pump output control circuit
7) Four output ports (Nch open drain).
8) Serial data input (CE, CK, DA)
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
119
1 page  
Audio ICs
BU2616F
(7) GT: Control of frequency measurement time
0: 32ms
1: 64ms
(8) SW: If this bit is set to ON while AMIN is
selected, swallow counter division is possible.
FIntermediate frequency detection circuit and the
FDO output.
(1) Structure
(9) PL PH: Control of charge pump output
PL = 0, PH = 0 PD1, PD2 go to PLL operation.
PL = 1, PH = 0 PD1, PD2 go to LO level.
PL = 0, PH = 1 PD1, PD2 go to HI level.
PL = 1, PH = 1 PD1, PD2 go to LO level.
(10) TS: Test data (0) is input
(2) How the IF frequency detection circuit operates
When control data CT is set to ON, the counter and the
amp go into operation. When CT equals 0, the amp input
pulldown counter is reset.
FExternal dimensions (Units: mm)
(3) Explanation of the DO
∗1 When the IF counter is OFF (CT = 0), SD input ap-
pears at the DO.
∗2 When the IF counter is set to ON (CT = 1), the con-
trol system keeps it at LO level until the measure-
ment is finished.
∗3 After the measurement is finished, it goes to HI level
if it is within the range of input frequency settings,
and is kept at LO level if it is beyond the range of in-
put frequency settings. When CT = 0, it returns to
the conditions described under paragraph ∗1.
123
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet BU2616.PDF ] | |
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