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Part: IZ8018
Category:
Multimedia
-> Audio
-> Sound Generators
-> Melody
Description:
Company: IK Semiconductor
Datasheet: Download IZ8018 datasheet File size : 522 kB
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Datasheet text preview:
MULTI MELODY GENERATOR FEATURES
ˇ Single-chip CMOS construction ˇ 512x10 bit ROM melodies ˇ Internal envelope circuit ˇ Low stand-by current ˇ Single 1.5V operation ˇ Piezo direct drive ˇ Easy to connect with standard watch and clock LSI's
IZ8018 FUNCTIONS
ˇ Tempo: 16 kinds ˇ Sound Range: 3 octaves (G4-G7) ˇ Serial select mode - total 7 melodies ˇ Play one melody, auto stop ˇ 32768 KHz extarnal clock
DESCRIPTION
The IZ8018 is a CMOS multi melody IC. The circuit is composed of a 512-word ROM, address counter, tempo and tone generator, address control circuit, envelope signal generator, switch control circuit and tone generator. The IZ8018 has complementary outputs MO, MO for direct piezo drive. Since the IZ8018 includes an envelope circuit on the output MO, it can generate good melody sound without any external component for envelope circuit. The IZ8018 can easily be connected to Integral's standard watch chips and designed especially for this target.
BLOCK DIAGRAM
Figure 1.
ABSOLUTE MAXIMUM RATINGS (Ta = 25oC)
Characteristic Supply Voltage Input Voltage Output Voltage Operating Temperature Storage Temperature Symbol VDD - VSS VIN VOUT Ta Tstg Value -0.3 ~ 4.0 VSS - 0.3 ~ VDD + 0.3 VSS - 0.3 ~ VDD + 0.3 - 20 ~ + 75 - 55 ~ + 125 Unit V V V
o o
C C
1
MULTI MELODY GENERATOR
IZ8018
ELECTRICAL CHARACTERISTICS
(Ta = 25oC, VDD = 1.55V, VSS = 0V, unless otherwise specified) Characteristic Operating Voltage Supply Current (Stand-by) Input High Voltage Input Low Voltage Input Current Symbol VDD IDD VIH VIL IIH IIL IOH Output Current IOL RD1 RD2 RD3 Output Resistor of MO RD4 RD5 RD6 RD7 RD8 Switch Chattering Time ICH VOL = 0.5V VOH = 0.7V t1 VOH = 0.7V t2 VOH = 0.7V t3 VOH = 0.7V t4 VOH = 0.7V t5 VOH = 0.7V t6 VOH = 0.7V t7 VOH = 0.7V t8 F = 32768 Hz VIN =1.55V VIN = 0V VOH = 1.0V MO MO MO MO 0.2 0.2 100 200 100 200 17 30 50 75 110 170 260 450 62.5 mS K ľA ľA 1 Without Load 1.25 0.3 10 0 .05 Test Condition Min 1.25 Typ 1.55 0.1 Max 3.3 0 .5 Unit V ľA V V ľA ľA
MELODY OPERATION
The BT8018 can repeat one of any 7 melodies consequently. ˇ ON-HOUR AND CONFIRMATION CHIME The IZ8018 has a 0.75 sec timer circuit to prevent the melody starting by chime sounds of the watch chip and by confirmation chime of chronograph or by signal below 0.75 sec. ˇ MELODY START The signals to start the melody are AC or DC signals which are over 0.75 sec after the first signal is given to BDIN. The signal under 0.75 sec will put the IZ8018 in standby mode. ˇ MELODY STOP The melody does not stop until it plays to the end of the melody even if alarm signal is stopped. Though the alarm signal is longer that the melody signal the melody does not repeat. If the melody is needs to be stopped midway it can be done by pushing either S1 or S2. MELODY SOUND
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MULTI MELODY GENERATOR
The musical interval of the melody is 400-1500 Hz with signal of 50% duty. The standard length of one melody is about 20 sec.
IZ8018
ENVELOPE FUNCTION
The IZ8018 has an envelope circuit on the output MO for high tone quality without any external components. The output current will decrease exponentially as show in Fig.2. The transistor for amplification would be NPN type and has proper hfe in order to keep this waveform.
Figure 2.
APPLICATION CIRCUIT
3
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IZ-1
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