TC9455,88F/N TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC9455F,TC9455N,TC9488F,TC9488N Digital Echo IC for Karaoke The TC9455 series are 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. TC9455F TC9488F Features · Incorporates a two-channel microphone amp with auto level control (ALC), AD/DA converter, delay memory, and electronic volume controllers. · Incorporates a 32-kHz sampling, 12-bit successive comparison AD/DA converter. · Incorporates a delay memory (16-Kbit DRAM) which enables 128-ms (typ.) delay. · Microphone and echo levels are controlled by built-in volume controllers. They are controlled either by DC voltage or controlled in serial by the MCU. TC9455N TC9488N TC9455F/N: Supports I2C bus interface TC9488F/N: Supports three-lead interface · The system clock is generated by the CR oscillator circuit. · The echo feedback amount is configured using analog circuits. The feedback level can be freely set. · The IC comes in 30-pin flat package or 24-pin shrink DIP. Weight: SSOP30-P-375-1.00: 1.08 g (typ.) SDIP24-P-300-1.78: 1.2 g (typ.) Pin Connection 1 2002-02-05 TC9455,88F/N Block Diagram System Block Diagram 2 2002-02-05 TC9455,88F/N Pin Description (Note 1) Pin Number TC9455N TC9455F TC9488N TC9488F Symbol I/O Function 1 1 VDD ― 2 2 CSCC I 3 3 OSCR I Resistor connecting pin for CR oscillator (R = 5.6 kΩ) Remarks Digital supply voltage pin Capacitor connecting pin for CR oscillator (C = 68 pF) 4 5 VOL1 ( CS ) I When VOLST = “H” level, CS signal input pin When VOLST = “L” level, DC control pin for MIC1 volume 5 6 VOL2 (SCL) I When VOLST = “H” level, clock input pin When VOLST = “L” level, DC control pin for MIC2 volume Open drain output 6 7 VOL3 (SDA) I When VOLST = “H” level, data input pin When VOLST = “L” level, DC control pin for echo volume Open drain output 7 9 VRO ― Reference voltage pin 8 10 VREF ― Reference voltage pin (1/2 VDD) 9 11 VDA ― Analog supply voltage pin 10 13 ALC1 I Auto level control pin 1 11 14 MC1N I MIC1 feedback signal input pin 12 15 MC1P I MIC1 signal input pin 13 16 MC2P I MIC2 signal input pin 14 17 MC2N I MIC2 feedback signal input pin 15 18 ALC2 I Auto level control pin 2 16 20 VSA ― Analog ground pin 17 21 MCO O MIC addition signal output pin 18 22 PRIN I Pre-filter input pin 19 23 ADIN I Pre-filter output signal or DC input pin 20 25 DAOUT O Post-filter output pin 21 26 VOLST I Electronic volume control mode select pin 2 When VOLST = “H” level, serial control (I C bus/three-lead) When VOLST = “L” level, DC level control 22 28 TEST I Test pin. Fix to “H” level for normal use 23 29 POOUT O Microphone echo signal output pin 24 30 VSS ― Digital ground pin Note 1: With the TC9455F and TC9488F, pins 4, 8, 12, 19, 24, and 27 are not connected (NC pins). NC pins are normally open. 3 2002-02-05 TC9455,88F/N Operation 1. Oscillator circuit The TC9455F/N and TC9488F/N generate an internal system clock using the CR oscillator circuit. Connecting a capacitance (C) of 68 pF 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. Varying the system clock enables the delay time to be adjusted. Figure 1 shows the CR oscillator circuit. 1.1 How to determine oscillator frequency (f) f [MHz] = 1532/(C [pF] × R [kΩ]) = 1532/(68 × 5.6) ≈ 4.0 MHz (Note 2) Note 2: The oscillator frequency is a typical value (Ta = 25°C). Set the resistance to between 4.7 kΩ and 6.8 kΩ. 1.2 How to determine sampling frequency (fs) fs [kHz] = f/128 = 4.0/128 ≈ 32 kHz Figure 1 CR Oscillator circuit 2. Microphone amps The IC incorporates microphone amps with auto level control (ALC). The microphone amp gain is typically 36dB. When a signal from 0 to −46dB is input, the ALC circuit can control the output signal level. Changing the external capacitor connected to the ALC circuit to a resistor sets the ALC circuit to off. Figure 2 shows the microphone amp circuit. When C = 4.7 µF, the attack and release times are as follows: Attack time = Approx. 29 ms Release time = Approx. 1.6 s Setting the capacitance (C) to a smaller value enables the attack and release times to be adjusted. When the ALC circuit is not used, change the capacitor (*1) to a resistor (approx. 10 kΩ), and connect to GND line. At power on, while the capacitor is being charged, no sound is output. So, use a capacitance of 4.7 µF or less. Figure 2 Microphone amp with ALC 4 2002-02-05 TC9455,88F/N 3. AD/DA converter and digital delay circuit The AD/DA converter is a 12-bit successive comparison type. The sampling frequency when the system clock operates at 4 MHz is 32 kHz. The analog signal input from the AD converter is converted to 12-bit digital data. The digital delay circuit compresses the 12-bit signal to 4-bit, writes it to delay RAM, then reads it. The 4-bit data read from delay 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 3 is a block diagram of the echo circuit. Figure 3 Block diagram of echo circuit 5 2002-02-05 TC9455,88F/N 4. Electronic volume controllers 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 TC9455F/N supports an I2C bus interface; the TC9488F/N, a three-lead interface. 4.1 Serial control timing Figure 4 shows the serial control timing. Figure 4 Serial control timing Table 1 lists bits used to set the volume. Table 1 Volume setting bits MODE DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 VOL1 setting M3 M2 M1 M0 0 0 0 0 VOL2 setting M3 M2 M1 M0 0 1 0 0 VOL3 setting M3 M2 M1 M0 1 0 0 0 VOL1, 2, 3 setting M3 M2 M1 M0 1 1 0 0 M3, M2, M1, M0: Volume setting data 6 2002-02-05 TC9455,88F/N 4.2 Setting of microphone and echo volumes Table 2 lists the microphone setting values and attenuation; Table 3 lists the echo volume setting values and attenuation. The DC level settings are typical values. Table 2 Microphone volume (VOL1, VOL2) attenuation Serial Data Setting DC Level Setting (V) 5.0 4.4 4.2 3.9 3.7 3.5 3.2 3.0 2.7 2.5 2.3 2.0 1.8 1.5 1.3 1.1 0.0 Attenuation (dB) M3 M2 M1 M0 0 0 0 0 0 0 0 0 1 −2 0 0 1 0 −4 0 0 1 1 −6 0 1 0 0 −8 0 1 0 1 −10 0 1 1 0 −12 0 1 1 1 −14 1 0 0 0 −16 1 0 0 1 −18 1 0 1 0 −20 1 0 1 1 −22 1 1 0 0 −24 1 1 0 1 −26 1 1 1 0 −28 1 1 1 1 −∞ Table 3 Echo volume (VOL3) attenuation Serial Data Setting DC Level Setting (V) 5.0 4.4 4.2 3.9 3.7 3.5 3.2 3.0 2.7 2.5 2.3 2.0 1.8 1.5 1.3 1.1 0.0 Attenuation (dB) M3 M2 M1 M0 0 0 0 0 0 0 0 0 1 −1 0 0 1 0 −2 0 0 1 1 −3 0 1 0 0 −4 0 1 0 1 −5 0 1 1 0 −6 0 1 1 1 −7 1 0 0 0 −8 1 0 0 1 −9 1 0 1 0 −10 1 0 1 1 −11 1 1 0 0 −12 1 1 0 1 −13 1 1 1 0 −14 1 1 1 1 −∞ 7 2002-02-05 TC9455,88F/N Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit VDD −0.3~6.0 V Input voltage Vin −0.3~VDD + 0.3 V Power dissipation PD Operating temperature Topr −25~85 °C Storage temperature Tstg −55~150 °C Supply voltage TC9455/88F 200 TC9455/88N 300 mW Electrical Characteristics (unless otherwise specified, Ta = 25°C, VDD = 5.0 V) DC characteristics Symbol Test Circuit Operating supply voltage VDD ― Operating supply current IDD Operating frequency Power-on reset voltage Characteristics Test Condition Min Typ. Max Unit Ta = −25~85°C 4.5 5.0 5.5 V ― Fmck = 4 MHz ― 20 30 mA Fmck ― fs = 32 kHz typ. ― 4.0 ― MHz Vpor ― ― 4.0 4.25 V “H” level VIH ― VDD × 0.8 ― VDD “L” level VIL ― 0 ― VDD × 0.2 “H” level IIH ― ― ― 1.0 “L” level IIL ― −1.0 ― ― Min Typ. Max Unit Input voltage Input current V µA Volume control (when VOLST = “L”) Symbol Test Circuit Hysteresis voltage VH ― ― 0.12 ― V Input step width VST ― ― 0.26 ― V Min level input voltage VImin ― ― 1.1 0.8 V Max level input voltage VImax ― 4.95 4.8 ― V Characteristics Test Condition 8 2002-02-05 TC9455,88F/N AC Characteristics Microphone amps and volumes Symbol Test Circuit MICG ― MCO Output at ALC Operation VM Maximum Input at No ALC Operation Characteristics Min Typ. Max Unit Input 1-kHz sine wave, −50dBV, MCO pin measured. 47.5 49.5 51.5 dBV ― Input 1-kHz sine wave, −25dBV. −0.8 1.7 3.2 dBV VL ― Input 1-kHz sine wave. ― −47.5 ― dBV Maximum Input 1 at ALC Operation VA1 ― Input 1-kHz sine wave. MCO output clip limit vale at max volume ― −4.0 ― dBV Maximum Input 2 at ALC Operation VA2 ― Input 1-kHz sine wave. MCO output clip limit value at microphone amp output point ― 6.5 ― dBV POOUT output noise 1 NO1 ― VOL1~3: min ― −90 −85 dBV POOUT output noise 2 NO2 ― VOL1: max, VOL2: min, VOL3: min ― −63 −58 dBV POOUT output noise 3 NO3 ― VOL1: min, VOL2: max, VOL3: min ― −64 −59 dBV POOUT output noise 4 NO4 ― VOL1: min, VOL2: min, VOL3: max ― −65 −54 dBV POOUT output noise 5 NO5 ― VOL1: max, VOL2: max, VOL3: min ― −60 −54 dBV POOUT output noise 6 NO6 ― VOL1: max, VOL2: min, VOL3: min ― −62 −54 dBV POOUT output noise 7 NO7 ― VOL1: min, VOL2: max, VOL3: max ― −62 −54 dBV POOUT output noise 8 NO8 ― VOL1~3: max ― −59 −52 dBV Volume 1, 2 attenuation ATT1 ― Ratio with one level higher (excluding the minimum level) ― −2.0 ― dB Volume 3 attenuation ATT2 ― Ratio with one level higher (excluding the minimum level) ― −1.0 ― dB C = 47 µF (Note 3) ― 120 ― ― 1 kHz Sine wave input, −20dBV → −10dBV C = 0.47 µF (Note 3) ― 10 ― 1 kHz Sine wave input, −10dBV → −20dBV C = 47 µF (Note 3) ― 1.6 ― C = 0.47 µF (Note 3) ― 0.15 ― Min Typ. Max Unit 0.25 ― ― µs Microphone amp gain Attack time TATK Release time TRLS ― Test Condition ms s Note 3: External capacitor of ALC pin Microcontroller interface (when VOLST = “H”) Symbol Test Circuit tIFS ― Shift clock “L” duration tL ― 0.25 ― ― µs Shift clock “H” duration tH ― 0.25 ― ― µs Data setup time tDS ― 0.25 ― ― µs Data hold time tDH ― 0.25 ― ― µs Interface hold time tIFH ― (Note 4) 1.0 ― ― µs CS “H” duration tCSH ― (Note 4) 0.25 ― ― µs Characteristics Interface setup time Test Condition (Note 4) Note 4: With TC9488F and TC9488N 9 2002-02-05 TC9455,88F/N AC Characteristics Test Points 1. TC9488F/N three-lead interface 2 2. TC9455F/N I C bus interface Purchase of TOSHIBA I2C components conveys a license under the Phillips I2C Patent Right to use the components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Phillips. tIFS tL tH tDS tDH tIFH tCSH > > > > > > > 0.25 µs 0.25 µs 0.25 µs 0.25 µs 0.25 µs 1.0 µs 0.25 µs interface setup time shift clock L time shift clock H time data setup time data hold time interface hold time CS signal H duration 10 2002-02-05 TC9455,88F/N TC9455/88F AC Test Circuit 11 2002-02-05 TC9455,88F/N Package Dimensions Weight: 1.08 g (typ.) 12 2002-02-05 TC9455,88F/N Package Dimensions Weight: 1.2 g (typ.) 13 2002-02-05 TC9455,88F/N RESTRICTIONS ON PRODUCT USE 000707EBA · TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. 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No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. · The information contained herein is subject to change without notice. 14 2002-02-05