TB2110FN View Datasheet(PDF) - Toshiba
Part Name
Description
Manufacturer
TB2110FN Datasheet PDF : 19 Pages
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2. Circuit configuration of prescaler and programmable counter
(1) Circuit configuration in the pulse swallow mode
TB2110FN
The circuit is configured with a 2 modulus prescaler, swallow counter (4 bits), and a programmable
counter (12 bits).
In FM and TV modes, a 1 / 4 and a 1 / 8 prescaler are added in the front stage.
(2) Circuit configuration in the direct divide method
In the direct divide method, the prescaler section is passed through and the circuit consists of only a
programmable counter (12 bits).
(3) The FM-IN and AM-IN inputs each have a built-in amp, and are therefore capable of capacitor-coupled,
small-amplitude operation.
○ Reference counter (divider to generate the reference frequency)
The reference counter section is configured with a crystal oscillator and a counter. Using a 75kHz crystal
oscillator, this circuit can generate seven types of reference frequencies.
1. Setting the reference frequency
Use the R0~R2 bits to set the reference frequency.
R2
R1
R0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Reference
Frequency
1kHz
3kHz
3.125kHz
5kHz
6.25kHz
12.5kHz
25kHz
Standby mode
· When REF code = 7 H (R0~R2 = 1), the device is
placed in standby mode.
10
2002-10-30
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