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PDF TB2110FN Data sheet ( Hoja de datos )
| Número de pieza | TB2110FN | |
| Descripción | PLL For DTS | |
| Fabricantes | Toshiba | |
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Hay una vista previa y un enlace de descarga de TB2110FN (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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PLL For DTS
TOSHIBA Bi−CMOS Integrated Circuit Silicon Monolithic
TB2110FN
TB2110FN
The TB2110FN is a high−speed PLL LSI built in a 2 modulus
prescaler that can operate with a 1.5V power supply.
Each function is controlled via three serial bus lines, allowing you
to configure a high−performance digital tuning system.
Features
· Due to a Bi−CMOS structure, the 1.5V power supply is
stepped up and stabilized by a bipolar circuit to drive the
CMOS section. Therefore, this chip is best suited for digital
tuning system in headphone stereos.
· Built in a prescaler, this IC can operate with TV: 50~250MHz
and FM: 40~150MHz (2 modulus type) for the FMIN input or
at 0.5~40MHz for the AMIN input (2 modulus type or directly
divided).
Weight: 0.31g (typ.)
· Comes with a 20 bit programmable counter, two parallel output phase comparators, crystal oscillator, reference
counter, and a DC / DC converter control circuit.
· The crystal oscillator (X’tal) used in this IC is a 75kHz resonator.
· The reference frequency can be selected from seven frequencies available. (ref = 1.0~25kHz)
· A 20 bit general−purpose counter is built in that can measure the IF and other frequencies.
· All device operations are controlled via three serial bus lines.
· Operating voltage range: VCC = 1.0~2.5V (Ta = −20~75°C)
· Package is SSOP24pin.
1 2002-10-30
1 page  
Pin No.
Symbol
18 AM-in
19 VREF1
20 FM-in
21 VCC
Pin Name
AM / SW signal input
pin
Reference pin
FM / TV signal input
pin
Bipolar section power
supply
22 DO1
23 DO2
Phase comparator
output
24 D-GND
MOS section GND
Function
Use this pin for AM / SW
signal input.
Use this pin as the reference
of the AM / FM signal.
Use this pin for FM / TV
signal input.
—
This is a tri-state output of
the phase comparator.
DO1~DO2 are parallel
outputs.
—
TB2110FN
Remarks
—
—
5 2002-10-30
5 Page 
TB2110FN
○ Phase comparator
The phase comparator compares the phase difference between the reference frequency signal fed from the
reference frequency divider and the divided output from the programmable counter, and outputs the difference.
In this way it controls the VCO through a low-pass filter to ensure that the frequencies and the phases of these
two signals are matched to each other.
Because this phase comparator has two tri-state buffers DO1 and DO2 connected in parallel as its outputs, you
can design the optimum filter constant for each of the FM and AM bands.
Furthermore, you can use the DOHZ bit of register D2 to place the DO2 output in a high-impedance state as
necessary.
Shown above is a DO output timing chart and a typical active low-pass filter circuit based on a darlington
connection of FET and bipolar transistors.
The filter circuit shown above is just one example. When designing the actual circuit, consider the band
configuration and the desired characteristics of your system.
11 2002-10-30
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet TB2110FN.PDF ] | |
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