Document
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
Pin Connection
TB2110FN
(Note) This device is vulnerable to surge voltages. Take it into account when using this device in your system.
2 2002-10-30
Block Diagram
TB2110FN
3 2002-10-30
Pin Function
Pin No.
Symbol
Pin Name
Function
1 XI 2 XO
Crystal oscillator pins
3 Data 4 Clock 5 Period 6 Out-1 7 Out-2 8 Out-3 9 Out-4
Serial data input / output Clock signal input
Period signal input
General-purpose output port
Connect a 75kHz crystal oscillator for the reference frequency to these pins.
Serial I / O port. Use this pin to set the divide ratio and divide method, as well as transfer data to and from the controller to control the general-purpose counter and general-purpose I / O port.
This is an open-collector output port. Use this port to output control signals.
10 In port
General-purpose input port
This port accepts the data to be fed to the output bit (out-5).
11 VCONT 12 VDD
DC / DC converter control pin
CMOS section power supply
13 Stand-by
Standby
14 IF-FM 15 VREF2 16 IF-AM 17 A-GND
General-purpose counter input Reference pin General-purpose counter input Bipolar section GND
This pin controls the DC / DC converter.
The VDD power supply from the DC / DC converter is applied to this pin.
The device is placed in standby mode when a “L” is input. The device is in active state when a “H” is input.
Use this pin for IF signal input on the FM side.
Use this pin as the reference of the IF signal.
Use this pin for IF signal input on the AM side.
—
TB2110FN
Remarks
— —
4 2002-10-30
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 in.