The BA1604 and BA1604F are tone decoder ICs that enable the frequency to be selected in precise detail, using a PLL system. These ICs are configured of a PLL circuit, a detection circuit, a voltage comparator circuit and an output logic drive circuit.

When the input signal is within the transmission range of the circuit, PLL is synchronized (locked) to the input signal. At this point, the output voltage of the decoder drops, and the change turns on the transistors for the voltage comparator and output logic drive circuits. A load of up to 100mA can be driven.The center frequency (f0) of the decoder is set by the mobile oscillation frequency of the current control oscillator. This frequency is determined by selecting a CR connected to Pins 5 and 6.

Features

1) The detection bandwidth can be varied independently between 0 and 14.

2) The output circuit can withstand a load current of up to 100mA, and is directly coupled to the logic circuit.

3) The center frequency offers a high level of stability.

4) High out-of-band signal and noise rejection capability.

5) Frequency can be changed over a range of 20 : 1 using an external resistor.

6) Compatible with EXAR XR-567 and Signetics NE567.

Applications

Telephones

Data communication systems

Remote control systems

BA1604属于集成电路（IC） > 电信。罗姆半导体集团制造生产的BA1604电信电信接口集成电路 (IC) 为通信网络接口提供特定功能和控制，例如以太网切换、线路驱动器、ISDN、放大器、通道扩展器、数字锁相环、DTMF、音频发生器和解码器、回声消除、检测器和发生器、DDA、电话线路监控器和主叫号码标识。