TC9488FG TOSHIBA Semiconductor CORPORATION, TC9488FG Datasheet
TC9488FG
Related parts for TC9488FG
TC9488FG Summary of contents
Page 1
... TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic Digital Echo IC for Karaoke The TC9488FG is digital echo ICs for karaoke. The ICs incorporate microphone amps and volume controllers, enabling a digital echo system to be configured on a single chip. Features • Incorporates a two-channel microphone amp with auto level control (ALC), AD/DA converter, delay memory, and electronic volume controllers ...
Page 2
... Block Diagram System Block Diagram 2 TC9488FG 2004-11-19 ...
Page 3
... Test pin. Fix to “H” level for normal use 29 POOUT O Microphone echo signal output pin 30 V ― Digital ground pin SS Note 1: With the TC9488FG, pins 4, 8, 12, 19, 24, and 27 are not connected (NC pins). NC pins are normally open. Function ) bus/three-lead) 3 TC9488FG Remarks ...
Page 4
... Operation 1. Oscillator circuit The TC9488FG generates an internal system clock using the CR oscillator circuit. Connecting a capacitance ( and a resistance (R) of 5.6 kΩ sets the oscillator frequency to approx. 4 MHz and the sampling frequency to 32 kHz. Varying the external capacitance enables the oscillator frequency and sampling frequency for the system clock to be adjusted ...
Page 5
... RAM is de-compressed to 12-bit. The 12-bit data are converted to analog signals by the DA converter and output. The area for delay RAM memory is 4096 words × 4 bits. The echo delay time is 4096 words × (1/32 kHz) = 128 ms. Figure block diagram of the echo circuit. Figure 3 Block diagram of echo circuit 5 TC9488FG 2004-11-19 ...
Page 6
... The IC incorporates microphone input 1 (MIC1) and microphone input 2 (MIC2) volume and echo volume controllers. The built-in volume controller operates in 16 steps. Using an external variable resistor, volume can be controlled by the DC level or from the MCU using serial data. The TC9488FG supports a three-lead interface. 4.1 Serial control timing Figure 4 shows the serial control timing ...
Page 7
... TC9488FG 2004-11-19 ...
Page 8
... V ― por V ― ― ― ― IL Test Symbol Test Condition Circuit VH ― VST ― VImin ― VImax ― 8 TC9488FG = 5 Min Typ. Max Unit 4.5 5.0 5.5 V ― ― 4.0 ― MHz ― 4.0 4. ― × 0.8 V ...
Page 9
... RLS −10dBV C = 0.47 µF → −20dBV (Note 3) Test Test Condition Circuit tIFS ― tL ― tH ― tDS ― tDH ― tIFH ― ― 9 TC9488FG Min Typ. Max Unit 47.5 49.5 51.5 dBV −0.8 1.7 3.2 dBV ― −47.5 ― dBV ― −4.0 ― dBV ― 6.5 ― ...
Page 10
... AC Characteristics Test Points TC9488FG three-lead interface TC94588FG AC Test Circuit 10 TC9488FG 2004-11-19 ...
Page 11
... Package Dimensions Weight: 1.08 g (typ.) 11 TC9488FG 2004-11-19 ...
Page 12
... The products described in this document are subject to the foreign exchange and foreign trade laws. • TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations. 12 TC9488FG 030619EBA 2004-11-19 ...