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FEDL6722-05 OKI Semiconductor
OKI Semiconductor MSM6722
Pitch Control IC for The Speech Signal
MSM6722 FEDL6722-05 Issue Date: Feb. 27, 2002
GENERAL DESCRIPTION
The MSM6722 converts in real-time the pitch of the speech signal in a range of one octave upward or downward. Two pitch control methods can be selected. One is to change the pitch in 17 steps by two switch inputs, and the other is to select one of 16 steps by four binary input lines. Since a microphone preamplifier and a low-pass filter are built in, the pitch conversion set can easily be configured by connecting a microphone, amplifier, and speaker in the peripheral circuit. The MSM6722 is functionally compared to the MSM6322, as described below.
1. Method of reseting the speech pitch step (UP/DW mode) MSM6322 ************** PRST pin only MSM6722 .............. Two methods are available. One is to reset by the PRST pin only, and the other is to reset using the UPC and DWC pins coneurrently. 2. Change in pitch MSM6322 ************** Speech pitch is changeable in 17 steps.
Pitch step 16
DW
Pitch step 8 Pitch step 0
UP
MSM6722 ************** The pitch step does not change if a signal is input to the UPC (DWC) pin when the pitch step is 16 or 0.
Pitch step 16
Pitch step 8 Pitch step 0
UP, DW
3. Additional THR/CHA pin This pin outputs a voice signal without passing the pitch conversion circuit including ADC*DAC.
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FEDL6722-05 OKI Semiconductor MSM6722
FEATURES
* Built-in microphone preamplifier * Built-in low-pass filters * Built-in 8-bit AD converter * Built-in 9-bit DA converter * Speech pitch alterable in 17 steps (including the no pitch change step) * Master clock frequency at 4 MHz * 5 V single power supply * Package : 24-pin plastic SOP (SOP24-P-430-1.27-K) (MSM6722GS-K) Chip
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BLOCK DIAGRAM
DVDD MIN SG MOUT LIN SG LOUT FOUT ADIN VOICE CHANGER CIRCUIT - + - + LPF ADC 8 - + AVDD DGND AGND TEST
AOUT DAO PD (P3) UPC (P2) DWC (P1) PRST (P0) MS THR/CHG RESET XT XT
LPF
DAC
9
TIMING & CONTROL SG CIRCUIT OSC
SGC
SG
PIN CONFIGURATION (TOP VIEW)
PD (P3) 1 UPC (P2) 2 DWC (P1) 3 PRST (P0) 4 MS 5 THR/CHG 6 TEST 7 DAO 8 AOUT 9 ADIN 10 FOUT 11 AVDD 12 24 23 22 21 20 19 18 17 16 15 14 13 DVDD XT XT RESET DGND SG AGND SGC MIN MOUT LIN LOUT
24-Pin Plastic SOP
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PIN DESCRIPTIONS
Common to UP/DOWN Mode and BINARY Mode
Pin 24 20 12 18 16 14 15 13 10 11 9 8 Symbol DVDD DGND AVDD AGND MIN LIN MOUT LOUT ADIN FOUT AOUT DAO Type -- -- -- -- I O I O O O Description Digital power supply pin. Insert a bypass capacitor of 0.1 mF or more between this pin and DGND. Digital ground pin. Analog power supply pin. Insert a bypass capacitor of 0.1mF or more between this pin and AGND. Analog ground pin. Inverting input pins for the built-in OP amplifier. The non-inverting input pin is connected internally to SG. MOUT and LOUT are output pins of the built-in OP amplifier for MIN and LIN respectively. Input pin for the built-in 8-bit AD converter. Output pin from the built-in LPF. Connect to ADIN Pin. Output pin from built-in LPF. This pin is used to output speech signals and to connect the amplifier for driving speaker. Output pin from built-in 9-bit DA converter. The IC enters the initial state when this pin is at the "L" level. At this time, the oscillation stops and the DA converter output (DAO) and audio output (AOUT) fall to the GND level. Then the IC returns to 21 RESET I the initial state. The IC has a built-in power-on-reset circuit. For normal power-on reset operation, supply the power within 1 msec. If power cannot be supplied within 1 msec, apply a RESET pulse after the power is switched on. Select pin for the pitch control or non-pitch control. 6 THR/CHG I With a "H" level input, the IC outputs a normal speech signal from the AOUT pin through the built-in OP amplifier. With a "L" level input, the IC outputs a pitch controlled speech signal from the AOUT pin. 7 23 22 19 17 TEST XT XT SG SGC I I O O Test pin to be fixed to "L" level. Crystal oscillator connecting pin. When using the external clock, use this pin as the input. Crystal oscillator connecting pin. When using the external clock, this pin must be left OPEN. These pins output the reference voltage (signal ground (SG)) of the analog circuit. The output is approximately 1/2 the AVDD level.
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FEDL6722-05 OKI Semiconductor UP/DOWN Mode Only
Pin 5 2 3 1 4 Symbol MS UPC I DWC PD PRST I I Type I Description Mode select pin. This pin must always be tied low. Pins for raising or lowering the pitch by one step at a time. The pitch changes by one step upward (or downward) each time a "H" level pulse is input to the UPC (or DWC) pin. The circuit enters the "no pitch change" state when an "H" level pulse is input to these pins simultaneously. Power-down pin. All clocks, including the internal oscillator circuit, are stopped when the PD pin is set to the "H" level. Pitch reset pin. The circuit enters the "no pitch change" state when this pin is set to the "H" level.
MSM6722
Binary Mode Only
Pin 5 1 2 3 4 Symbol MS P3 P2 P1 P0 I Type I Description Mode select pin. This pin must always be tied high. The pitch step is directly set by 4 pins (bits) of P3 (MSB) to P0 (LSB). One of the 16 steps from step 0 (P3=P2=P1=P0="L") to step 15(P3=P2= P1=P0="H") can be set.
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ABSOLUTE MAXIMUM RATINGS
Parameter Power-supply voltage Input voltage Storage temperature Symbol VDD VIN TSTG Condition Ta = 25C Ta = 25C -- Rating -0.3 to +7.0 -0.3 to VDD + 0.3 -55 to +150 Unit V V C
RECOMMENDED OPERATING CONDITIONS
Parameter Power-supply voltage Operating temperature Master clock frequency Symbol VDD Top fOSC Condition DGND = AGND = 0 V -- -- Range 4.5 to 5.5 -10 to +70 4 to 4.5 Unit V C MHz
ELECTRICAL CHARACTERISTICS
DC Characteristics
(Ta = -10 to +70C, DVDD = AVDD = 4.5 V to 5.5 V, DGND = AGND = 0 V) Parameter "H" input voltage "L" input voltage "H" input current "H" input current "H" input current "L" input current "L" input current *1 *2 *4 *3 *2 Symbol VIH VIL IIH1 IIH2 IIH3 IIL1 IIL2 IDD Condition -- -- VIH = VDD VIH = VDD VIH = VDD VIL = GND VIL = GND fOSC = 4 MHz, no load At power down, no load Operating current consumption (2) IPD Ta=-40 to +70C At power down, no load Ta=-40 to +85C Min 0.8 x VDD -- -- -- 20 -10 -20 -- -- -- Typ -- -- -- -- -- -- -- 6 -- -- Max -- 0.2 x VDD 10 20 650 -- -- 12 10 50 Unit V V mA mA mA mA mA mA mA mA
Operating current consumption (1)
*1 Applies to all input pins excluding the XT pin. *2 Applies to the XT pin. *3 Applies to all the input pins without pull-down resistors, excluding the XT pin (i.e., pins 1, 5-7, 10, 14, 16, 21; however pin 1 is applied only during UP/DOWN mode). *4 Applies to the input pins with pull-down resistors, excluding the XT pin (i.e., pins 1, 2, 3, 4; however, pin 1 is applied only during BINARY mode).
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FEDL6722-05 OKI Semiconductor Analog Characteristics
(Ta = -10 to +70C, DVDD = AVDD = 4.5 V to 5.5 V, DGND = AGND = 0 V) Parameter DA output relative error AD output relative error SCF allowable input voltage range SCF input impedance OP amplifier open loop gain OP amplifier input impedance OP amplifier load resistance AOUT load resistance Symbol | VDAE | | VADE | VFIN RFIN GOP RINA ROUTA RAOUT Condition No load No load -- -- fIN = 0 to 4 kHz -- -- -- Min -- -- 1 1 40 1 200 50 Typ -- -- -- -- -- -- -- -- Max 40 40 VDD-1 -- -- -- -- -- Unit mV mV V MW dB MW kW kW
MSM6722
AC Characteristics
(Ta = -10 to +70C, fOSC = 4 MHz, DVDD = AVDD = 4.5 V to 5.5 V, DGND = AGND = 0 V) Parameter DAO output delay from falling edge of PD Pulse width of PRST, UPC, and DWC pulses Time between UPC and DWC pulses Pitch change delay from rising edge of PRST Pitch change delay from rising edge of UPC and DWC Symbol tPDD tUDPW tRUD tCHG1 tCHG2 Condition fOSC = 4 MHz fOSC = 4 MHz fOSC = 4 MHz fOSC = 4 MHz fOSC = 4 MHz Min -- 62 31 62 31 Max 16 -- -- -- -- Unit ms ms ms ms ms
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FEDL6722-05 OKI Semiconductor MSM6722
TIMING DIAGRAM
PD(I)
tPDD
1/2 AVDD DAO(O)
tUDPW PRST(I)
tUDPW UPC(I) DWC(I) tCHG1 Pitch change timing Pitch step is 8 ("no pitch change" state) by PRST tCHG2
tRUD
Raise/lower a pitch by one step (pitch steps 0 to 15)
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FEDL6722-05 OKI Semiconductor MSM6722
FUNCTIONAL DESCRIPTION
Power Supply Wiring As shown in the diagram below, supply the power to this IC from the same power source, but separate the wiring for the analog and the logic sections. To improve the electrical characteristics, insert a bypass capacitor of 0.1 mF or more between DVDD and DGND and between AVDD and AGND.
+5 V DVDD MSM6722 DGND AGND AVDD
Do not supply the power to the analog section and the logic section from separate power sources; otherwise latch-up may occur.
No good Analog power supply Digital power supply DVDD AVDD DVDD AVDD No good +5 V
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FEDL6722-05 OKI Semiconductor Connecting an Oscillator Connect ceramic or crystal oscillators to the XT and XT pins as shown below. The characteristics of recommended ceramic oscillators of MURATA MFG. and KYOCERA CORPORATION are shown below for reference.
MSM6722 XT XT
MSM6722
C1
C2
Ceramic oscillator Maker Type CSTLS4M00G53-B0 (with capacitor) CSTCR4M00G53-R0 (with capacitor) Frequency (MHz)
Optimal load Capacity C1(pF) C2(pF)
Supply voltage Operating temperature range(V) range(C)
MURATA MFG.
4.0
--
--
4.5 to 5.5
-10 to +70
KYOCERA CORPORATION
KBR-4.0MSA KBR-4.0MKS PBRC4.00B
4.0
33
33
4.5 to 5.5
-10 to +70
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FEDL6722-05 OKI Semiconductor Analog Input Amplifier Circuit The MSM6722 has two built-in operational amplifiers for amplifying the microphone output. Each output amplifier is provided with an inverting input pin and output pin. The analog circuit reference voltage SG (signal ground) is connected internally to the non-inverting input of each output amplifier. For amplification, form an inverting amplifier circuit and adjust the amplification ratio by using external resistors, as shown below. MSM6722
VIN
- +
VMO R1 MIN
- +
VLO R3 R4 LOUT
- +
R2 MOUT
VLO
VDD VDD-1 1/2 VDD 1 GND
LIN
OP amplifier 1
OP amplifier 2
SG R4 R3 R2 * R4 R1 * R3
VLO =
VMO =
VIN (V)
The output VLO of output amplifier 2 is connected to the input FIN of the built-in LPF. The FIN allowable input voltage (VFIN) ranges from 1 V to (VDD-1) V. Therefore, the amplification ratio must be adjusted so that the VLO amplitude can be within the FIN allowable input voltage range. For example, if VDD = 5 V, VLO becomes 3 Vp-p max. If VLO exceeds the FIN allowable input voltage range, the output of the LPF will be a clipped waveform. The load resistance ROUTA of the OP amplifier is 200 kW or more. Therefore, the feedback resistors R2 and R4 of the inverting amplifier circuit must be 200 kW or more.
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FEDL6722-05 OKI Semiconductor Analog Input Amplifer Circuit The output VLO of OP amplifer 2 is connected to the input FIN of the built-in LPF. The allowable FIN input voltage VFIN ranges from 1 V to (VDD - 1) V. Therefore, the amplification factor must be adjusted so that the VFIN amplitude can be within the allowable FIN input voltage range. For example, if VDD = 5 V, VLO becomes 3 VP-P max. If VLO exceeds the allowable FIN input voltage range, the output of the LPF will be a clipped waveform. The load resistance ROUTA of the OP amplifier is 200 kW or more. Therefore, the feedback resistors R2 and R4 must be 200 kW or more. When OP amplifier 1 is not used and OP amplifier 2 is used, the MIN pin must be connected to AGND or AVDD, and the MOUT pin must be open. Even if amplification is unnecessary, OP amplifier 2 must be always used. Below is an example of an analog input amplifier circuit when the amplification factor is 1. MSM6722
Input signal
(200kW) R3
(200kW) R4
AGND MIN MOUT LIN LOUT
- + SG
OP amplifier 1
- +
OP amplifier 2
MSM6722
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FEDL6722-05 OKI Semiconductor Configuring SGC and SG pins The internal equivalent circuit around the SGC and SG pins is shown below. MSM6722
AVDD MSM6722 50kW (TYP)
SGC AGND 50kW (TYP)
+ -
To OP amplifier LPF SG 20kW (TYP) AGND
Power-down signal Switch is open during power-down mode AGND
The SG signal is reference voltage (signal ground) for internal OP amplifiers and LPF. Install a capacitor between the SGC pin and AGND and between the SG pin and AGND respectively in order to make the SG signal noiseless. It is recommended to install an approx. 1m capacitor, which should be determined after evaluating the tone quality. It takes several ten msec until the DC levels such as the SG level of the analog circuit is stabilized after the power-down mode is cancelled. The larger capacitance of a capacitor connected to SGC or SG requires the longer time for stabilizing. After the power-down mode is cancelled, enter voices after the DC levels for the analog circuit has been stabilized. When the device is in power-down mode, the output voltage of the SG pin becomes unstable. Therefore, SG must not be supplied to external circuits. Otherwise, power suppluy current may be leaked via the internal SG circuit. Same is true for the SGC pin.
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FEDL6722-05 OKI Semiconductor Pitch-Control Circuit [BINARY mode] (P3, P2, P1, P0) As shown in the diagram below, this IC has an internal prevention circuit for approximately 62 ms of chattering . Therefore, hold these pins at "H" level for 62 ms or more. P3, P2, P1, and P0 pins are used to directly set the pitch steps. Sixteen pitch steps are provided, but step 16 cannot be set. [UP/DOWN mode] (UPC, DWC, PRST) As shown in the diagram below, this IC has an internal prevention circuit for approximately 62 ms of chattering . Therefore, hold these pins at "H" level for 62 ms or more.
[BINARY mode] P3 Valid data P2 P1 P0 Chattering prevention circuit
MSM6722
To pitch register
[UP/DOWN mode] UPC Pulse input DWC PRST Chattering prevention circuit To pitch register
Pitch-Control Circuit Inputting a "H" level pulse to the UPC pin raises the pitch by one step, and inputting a "H" level pulse to the DWC pin lowers the pitch by one step. Inputting a "H" level pulse to the PRST pin or to the UPC and DWC pins at the same time sets the no-pitch change state (pitch step 8).
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FEDL6722-05 OKI Semiconductor MSM6722
A pitch shifts in a range of about one octave upward or downward, centered at pitch step 8. The pitch shift is illustrated in the following keyboard diagram and the following table via corresponding frequencies. Pitch Conversion Diagram
0
1
5
9
10
14
2
3
4
6
7
8
11
12
13
15
16
Pitch Conversion Table
Pitch step 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DA sampling cycle (s)/ frequency (kHz) 60/16.6 71/14.0 76/13.1 80/12.5 90/11.1 90/10.5 101/9.90 113/8.84 120/8.33 127/7.87 143/6.99 151/6.62 160/6.25 180/5.55 190/5.26 202/4.95 227/4.40
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OKI Semiconductor
UP/DOWN Mode
APPLICATION CIRCUITS
UP DW PRST
MSM6722
PD (P3) UPC (P2) DWC (P1) PRST (P0) MS THR/CHG TEST DAO AOUT ADIN FOUT AVDD 0.1 mF DVDD XT XT RESET DGND SG AGND SGC MIN MOUT LIN LOUT
+ +
0.1 mF 30 pF 4.0 MHz 100 kW 30 pF 1 mF 1 mF RST
10 kW
+
0.47 mF
51 pF
100 kW
0.4 mF 10 kW
FEDL6722-05
Speaker drive amplifier MSC1157
SP
MSM6722
51 pF
330 kW
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OKI Semiconductor
BINARY Mode
MSM6722
HEX switch PD (P3) UPC (P2) DWC (P1) PRST (P0) MS THR/CHG TEST DAO AOUT ADIN FOUT AVDD 0.1 mF DVDD XT XT RESET DGND SG AGND SGC MIN MOUT LIN LOUT
+ +
0.1 mF 30 pF 4.0 MHz 100 kW 30 pF 1 mF 1 mF RST
10 kW
+
0.47 mF
51 pF
100 kW
0.4 mF 10 kW
FEDL6722-05
Speaker drive amplifier MSC1157
SP
MSM6722
51 pF
330 kW
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PAD CONFIGURATION
Pad Layout (Top View) View from the side cofiguring the pads
Chip Size Chip Thickness Pad Size Chip Substrate Voltage : : : : 3.99 mm 3.08 mm 350 mm 30 mm 110 mm 110 mm VDD Y
21
20
19
18
17
16
22 23
15 14 13 12
24
X
1 2 3 4 5 6 7 8 9
11 10
Pad Coordinates (Chip center is located at X=0 and Y=0.)
Pad No 1 2 3 4 5 6 7 8 9 10 11 12 PAD name PD UPC DWC PRST MS THR/CHG TEST DAO AOUT ADIN FOUT AVDD X (mm) -1784 -1784 -1784 -1314 -736 -275 53 912 1447 1783 1783 1733 Y (mm) -602 -955 -1310 -1391 -1397 -1397 -1397 -1396 -1396 -974 -561 -238 Pad No 13 14 15 16 17 18 19 20 21 22 23 24 PAD Name LOUT LIN MOUT MIN SGC AGND SG DGND RESET XT XT DVDD X (mm) 1782 1782 1782 1351 938 598 -127 -650 -1198 -1787 -1786 -1736 Y (mm) 356 780 1193 1359 1359 1295 1359 1359 1359 1053 703 84
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PACKAGE DIMENSIONS
(Unit : mm)
SOP24-P-430-1.27-K
Mirror finish
Oki Electric Industry Co., Ltd.
Package material Lead frame material Pin treatment Package weight (g) Rev. No./Last Revised
Epoxy resin 42 alloy Solder plating (5 mm) 0.58 TYP. 5/Oct. 13, 1998
Notes for Mounting the Surface Mount Type Package The surface mount type packages are very susceptible to heat in reflow mounting and humidity absorbed in storage. Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times).
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REVISION HISTORY
Document No. FEDL6722-04 FEDL6722-05 Page Date Jul. 2001 Feb. 27, 2002
Previous Current Edition Edition
Description Fourth edition Changed contents of the table for ceramic oscillators Addition of Revision History
-- 9 --
-- 10 20
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NOTICE
1. The information contained herein can change without notice owing to product and/or technical improvements. Before using the product, please make sure that the information being referred to is up-to-date. The outline of action and examples for application circuits described herein have been chosen as an explanation for the standard action and performance of the product. When planning to use the product, please ensure that the external conditions are reflected in the actual circuit, assembly, and program designs. When designing your product, please use our product below the specified maximum ratings and within the specified operating ranges including, but not limited to, operating voltage, power dissipation, and operating temperature. Oki assumes no responsibility or liability whatsoever for any failure or unusual or unexpected operation resulting from misuse, neglect, improper installation, repair, alteration or accident, improper handling, or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified operating range. Neither indemnity against nor license of a third party's industrial and intellectual property right, etc. is granted by us in connection with the use of the product and/or the information and drawings contained herein. No responsibility is assumed by us for any infringement of a third party's right which may result from the use thereof. The products listed in this document are intended for use in general electronics equipment for commercial applications (e.g., office automation, communication equipment, measurement equipment, consumer electronics, etc.). These products are not authorized for use in any system or application that requires special or enhanced quality and reliability characteristics nor in any system or application where the failure of such system or application may result in the loss or damage of property, or death or injury to humans. Such applications include, but are not limited to, traffic and automotive equipment, safety devices, aerospace equipment, nuclear power control, medical equipment, and life-support systems. Certain products in this document may need government approval before they can be exported to particular countries. The purchaser assumes the responsibility of determining the legality of export of these products and will take appropriate and necessary steps at their own expense for these. No part of the contents contained herein may be reprinted or reproduced without our prior permission.
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Copyright 2002 Oki Electric Industry Co., Ltd.
Printed in Japan
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