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ML2502
RECORD/PLAYBACK LSI with 128Kbit Analog Cell Storage Flash Memory n
ML2502 DATA SHEET
Preliminary
Revision 8.0 Apr. 01, 1999
GENERAL DESCRIPTION
ML2502 is a record/playback LSI that stores analog signal directly into on-chip Flash memory (128Kbit Cell) without digital conversion utilizing new Analog Storage technology. Such unique features as low voltage operability (2.7 ~ 3.3V), no backup requirement and no external MCU requirement makes the ML2502 an ideal choice for handy Voice Memo, Message Card, toys and other consumer applications.
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FEATURES
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On-chip 128Kbit Cell Analog Storage Flash Memory Program/Erase Cycles 10K cycles Data Retention Period 10 years Record/Playback Control via Switch Input Phrasing Mode Single-phrase or Dual-phrase
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Record/Playback Time Length (At 6.4 kHz sampling frequency) In Dual-phrase Mode Max. ap. 10 sec each (Entire memory area divided into 2) In Single-phrase Mode Max. ap. 20sec (Using the whole memory area by wiring REC1 and REC2 pins, PLAY1 and PLAY2 pins together) Sampling Frequencies Selectable from 4.0 kHz, 5.3 kHz, 6.4 kHz Built-in Mic. Amplifier with AGC (Auto Gain Control) Built-in LPF (Low Pass Filter) Built-in Speaker Driver Allows to use either Piezo or Dynamic speaker by externally setting up an amplitude ratio. On-chip Oscillation Circuit (No requirement for an external oscillator) Operating Voltage Operating Temperature Packaging 2.7V ~ 3.3V -10C ~ +70C 30-pin SSOP, Die Form
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ML2502 Data Sheet (Revision 8.0)
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BLOCK DIAGRAM MOUT LIN LOUT
MIN
+
+
LPF
+ -
AOUT SPIN SPOUT+ SPOUT-
SG ROSC Internal Oscillator
AGC
Analog Write & Read Circuits 128K Bit Cell Analog Storage Flash Memory Array Address Decoder
SAM1 SAM2
Sampling Clock
Controller
Power Supplies
AVDD AGND
REC1 n PIN LAYOUT
REC2 PLAY1 PLAY2 ERASE MON
DVDD DGND
PKG Code: SSOP30-P-56-0.65
(TOP VIEW)
NC DVDD REC1 REC2 PLAY1 PLAY2 ERASE MIN MOUT LIN LOUT AVDD AVDD SPOUT+ NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 NC SAM1 SAM2 ROSC DGND MON TEST NC NC AOUT SPIN AGND SPOUTAGND NC
ML2502 Data Sheet (Revision 8.0)
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PIN DESCRIPTION
PIN REC1 I/O I Description Input start-recording signal for Phrase 1 to this pin. "H" level input to this pin initiates recording to Phrase 1 memory area. Recording goes on while this pin being held "H". In single-phrase mode, the pin is connected to the REC2 pin. The REC1 pin is internally pulled down. Input start-recording signal for Phrase 2 to this pin. "H" level input to this pin initiates recording to Phrase 2 memory area. Recording goes on while this pin being held "H". In single phrase mode, the pin is connected to the REC1 pin. The REC2 pin is internally pulled down. Input start-playback signal for Phrase 1 to this pin. A "H" pulse input to this pin initiates playback of Phrase 1. Re-inputting a "H" pulse during playback causes to stop playback. In single phrase mode, the pin is connected to the PLAY2 pin. The pin is internally pulled down. Input start-playback signal for Phrase 2 to this pin. A "H" pulse input to this pin initiates playback of Phrase 2. Re-inputting a "H" pulse during playback causes to stop playback. In single phrase mode, the pin is connected to the PLAY1 pin. The pin is internally pulled down. Erase-enable signal input pin, used together with the REC1 and/or REC2. Input "H" level to the REC1/REC2 pin with this pin being held "H" to erase respective phrase. The pin is internally pulled down. Pins used to select a sampling frequency. SAM1 SAM2 I SAM1 SAM1 Fs L L 4.0kHz L H 5.3kHz H L 6.4kHz H H Unused
REC2
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PLAY1
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PLAY2
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ERASE
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MON ROSC MIN MOUT LIN LOUT AOUT SPIN SPOUT+ SPOUTDVDD DGND AVDD AGND
O I I O I O O I O - - - -
Output "H" level during record or playback operation. Insert a 30k resistor between this pin and the DGND pin. The resistor determines the oscillation frequency for the internal oscillation circuit. Input to the Microphone amplifier. Output from the Microphone amplifier. Voltage amplitude is automatically controlled to an appropriate output level by the internal AGC circuit. Input to the Line amplifier. Connected to inverted input for the internal Op. amplifier. Output from the Line amplifier. Connected to the output pin from the internal Op. amplifier. Connecting resistors to the LIN and LOUT pins configures an inverted amplifier. Output analog signal for playback. Input to the speaker driver. The resistor's value inserted between the AOUT and SPIN pin determines voltage amplitude of the speaker driver. Select an appropriate value depending on types of speaker in use. Output from the speaker driver. Connect a speaker in-between these pins. Output two phase-inverted analog signals for playback from the speaker driver. Digital power supply pin. Insert a 0.1F or larger bypass capacitor between this pin and the DGND pin. Digital ground pin. Analog power supply pin. Insert a 0.1F or larger bypass capacitor between this pin and the AGND pin. Analog ground pin.
ML2502 Data Sheet (Revision 8.0)
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Record/Playback Operation
ML2502 has two record/playback modes, Dual-phrase record/playback mode and Singlephrase record/playback mode. While in Dual-phrase record/playback mode the total memory space is divided evenly into two areas for 2-phrase record/playback, the entire memory space is used for one phrase record/playback in Single-phrase record/playback mode. In Dual-phrase record/playback mode the first half of the memory, i.e. from the top address up to the center address, is assigned to Phrase 1, and the second half, i.e. from the center address to the last address, is assigned to Phrase 2. Record/playback of Phrase 1 can be controlled via the REC1 and PLAY1 pins, while Phrase 2 can be controlled via the REC2 and PLAY2 pins respectively. In Single-phrase mode record/playback must be performed with the REC1 being connected to the REC2 pin and the PLAY1 being connected to the PLAY2 pin respectively. In both playback modes repetitive playback function for the same phrase is available.
1. Dual-Phrase Record/Playback Mode 1.1 Phrase 1 Recording Operation
(1) (2) (3) (4) Keep on inputting "H" level to the REC1 pin to power up and start recording from the top address of the memory. Recording goes on while the REC1 pin being held "H" level. The LSI automatically ends recording when the center address has been reached. The LSI automatically shifts to low-power consumption mode after recording ends. To stop recording for phrase 1 before reaching the center address, bring the REC1 pin down to "L" level. The LSI automatically shifts to low-power consumption mode after recording stops. During recording operation any signal input to other pins than the REC1 is disregarded. Note: Re-recording always causes to overwrite the existing recording data for a given phrase.
Start REC1 REC2 MON Status
Power Down Powering Up Recording Powering Down Power Down
(5)
Invalid Input
Stop
Stopping Process
Figure 1.1 Timing Chart for Phrase 1 Recording Operation
ML2502 Data Sheet (Revision 8.0)
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ML2502
1.2
(1) (2) (3) (4)
Phrase 1 Playback Operation
Input a "H" pulse to the PLAY1 pin to power up and start playback from the top address of the memory. The LSI automatically ends playback when the last address of the recorded phrase has been reached. The LSI automatically shifts to low-power consumption mode after playback ends. To stop playback of phrase 1 before reaching the last address, input a "H" pulse again to the PLAY1 or PLAY2 pin. This will cause the LSI to stop playback and then automatically shift to low-power consumption mode. During playback operation signal input to the PLAY1 or PLAY2 pin only is valid, any other signal input is disregarded
Start Pulse Stop Pulse
(5)
PLAY1 PLAY2 MON Status
Power Down Powering Up Playing Back Powering Down Power Down
Figure 1.2 Timing Chart for Phrase 1 Playback Operation
1.3
(1)
Phrase 1 Erasing Operation
While inputting "H" level to the ERASE pin, input a "H" pulse to the REC1 pin to start erasing Phrase 1. (2) After Phrase 1 having been erased, the LSI automatically shifts to power-down mode for low-power consumption. Note: Erasing operation cannot be abandoned in the middle once getting started. Internally, the LSI performs erasing Phrase 1 by recording "Silence" from the top address to address 250. Therefore, if you attempt to playback the erased phrase, the playback starts at the top address of the memory and ends at address 250.
Start Pulse ERASE REC1 MON Status
Power Down Powering Up Erasing Powering Down Power Down
Figure 1.3 Timing Chart for Phrase 1 Erasing Operation
ML2502 Data Sheet (Revision 8.0)
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1.4
(1) (2) (3) (4)
Phrase 2 Recording Operation
Keep on inputting "H" level to the REC2 pin to power up and start recording from the top address of the memory. Recording goes on while the REC2 pin being held "H" level. The LSI automatically ends recording when the last address of the memory has been reached. The LSI automatically shifts to low-power consumption mode after recording ends. To stop recording for Phrase 2 before reaching the last address, bring the REC2 pin down to "L" level. The LSI automatically shifts to low-power consumption mode after recording stops. During recording operation any signal input to other pins than the REC2 is disregarded. Note: Re-recording always causes to overwrite the existing recording data for a given phrase.
Start Invalid Input Stop
(5)
REC1 REC2 MON Status
Power Down Powering Up Recording Powering Down Power Down
Stopping Process
Figure 1.4 Timing Chart for Phrase 2 Recording Operation
1.5
(1) (2) (3) (4)
Phrase 2 Playback Operation
Input a "H" pulse to the PLAY2 pin to power up and start playback from the center address of the memory. The LSI automatically ends playback when the last address of the recorded phrase has been reached. The LSI automatically shifts to low-power consumption mode after playback ends. To stop playback of Phrase 2 before reaching its last address, input a "H" pulse again to the PLAY1 or PLAY2 pin. This will cause the LSI to stop playback and then automatically shift to low-power consumption mode. During playback operation signal input to the PLAY1 or PLAY2 pin only is valid, any other signal input is disregarded
Start Pulse Stop Pulse
(5)
PLAY1 PLAY2 Stop MON Status
Power Down Powering Up Playing Back Powering Down Power Down
Figure 1.5 Timing Chart for Phrase 2 Playback Operation
ML2502 Data Sheet (Revision 8.0)
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1.6
(1) (2)
Phrase 2 Erasing Operation
While inputting "H" level to the ERASE pin, input a "H" pulse to the REC2 pin to start erasing Phrase 2. After Phrase 2 having been erased, the LSI automatically shifts to power-down mode for low-power consumption.
Note: Erasing operation cannot be abandoned in the middle once getting started. Internally, the LSI performs erasing Phrase 2 by recording "Silence" from the center address as far as to address 250. Therefore, if you attempt to playback the erased phrase, the playback starts at the center address of the memory and ends at address 250.
Start Pulse ERASE REC2 MON Status
Power Down Powering Up Erasing Powering Down Power Down
Figure 1.6 Timing Chart for Phrase 2 Erasing Operation
ML2502 Data Sheet (Revision 8.0)
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ML2502
2. Single-phrase Record/Playback Mode 2.1
(1)
Recording Operation
In this mode the REC1 has to be connected with the REC2 pin. Keep on inputting "H" level to the REC1 and the REC2 pin to power up and start recording from the top address of the memory. Recording goes on while the REC1 and the REC2 pin being held at "H" level. The LSI automatically ends recording when the last address of the memory has been reached. The LSI automatically shifts to low-power consumption mode after recording ends. To stop recording before reaching the last address, bring the REC1 and the REC2 pin down to "L" level. The LSI automatically shifts to low-power consumption mode after recording stops. During recording operation any signal input to other pins than the REC1 and the REC2 is disregarded. Note: Re-recording always causes to overwrite the existing recording data for a given phrase.
(2) (3) (4)
(5)
Start REC1 REC2 PLAY1 PLAY2 MON Status
Power Down Powering Up
Invalid Input
Stop
Recording
Powering Down
Power Down
Stopping Process
Figure 2.1 Timing Chart for Single-phrase Recording Operation
ML2502 Data Sheet (Revision 8.0)
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2.2
(1) (2) (3) (4)
Playing Back Operation
Input "H" pulses to the PLAY1 and the PLAY2 pins simultaneously to power up and start playback from the top address of the memory. The LSI automatically ends playback when the last address of the recorded phrase has been reached. The LSI automatically shifts to low-power consumption mode after playback ends. To stop playback of the phrase before reaching its last address, input "H" pulses again to the PLAY1 and the PLAY2 pins simultaneously. This will cause the LSI to stop playback and then automatically shift to low-power consumption mode. During playback operation signal input to the PLAY1 or PLAY2 pin only is valid, any other signal input is disregarded.
(5)
Start Pulse PLAY1 PLAY2 REC1 REC2 MON Status
Power Down Powering Up
Invalid Input
Stop Pulse
Playing Back
Powering Down
Power Down
Figure 2.2 Timing Chart for Single-phrase Playback Operation
ML2502 Data Sheet (Revision 8.0)
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ML2502
2.3
(1) (2)
Erasing the Phrase 2
While inputting "H" level to the ERASE pin, input "H" pulses to the REC1 and REC2 pins simultaneously to start erasing the phrase. After the phrase having been erased, the LSI automatically shifts to power-down mode for low-power consumption.
Note: Erasing operation cannot be abandoned in the middle once getting started. Internally, the LSI performs erasing by recording "Silence" from the top address as far as to address 250. Therefore, if you attempt to playback the erased phrase, the playback starts at the top address of the memory and ends at address 250.
Start Pulse ERASE REC1 REC2 MON Status
Power Down Powering Up Erasing Powering Down Power Down
Figure 2.3 Timing Chart for Single-phrase Erasing Operation
ML2502 Data Sheet (Revision 8.0)
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ML2502
3. Repeating Playback Operation
(1) (2) (3) (4) (5)
To repeat playback of the same phrase, keep on inputting "H" level to the PLAY1 or PLAY2 pin. "H" level input to the PLAY1 or PLAY2 causes the LSI to power up and start playback. The LSI automatically restarts playback when the last address of the phrase has been reached. When the playback reaches to the last address of the phrase, with the PLAY1 or PLAY2 pin being held "L" level, the LSI automatically ends playback. The LSI automatically powers down after playback ends. To stop playback before repetitive playback session ends, bring the PLAY1 or PLAY2 pin down to "L" level once, and then re-input a "H" pulse to the PLAY1 or PLAY2 pin. The LSI automatically shifts to low-power consumption mode after playback stops.
Start Pulse PLAY1 PLAY2 End Playing MON Status
Power Down Powering Up Playing Back Interval Playing Back
Stop Pulse
Resume Plaing
Powering Down Power Down
Figure 3.1 Timing Chart for Repetitive Playback Operation
ML2502 Data Sheet (Revision 8.0)
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ABSOLUTE MAXIMUM RATINGS
Parameter Symbol
Conditions
Ta = 25C --
Rating -0.3 ~ +6.0 -0.3 ~ VDD + 0.3 -55 ~ +150
Unit V V C
Power Supply Voltage Input Voltage Storage Temperature
VDD VIN TSTG
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RECOMMENDED OPERATING RANGES
Parameter Symbol Conditions DGND=AGND=0V --
Range
2.7 ~ 3.3 -10 ~ + 70
Unit V C
Power Supply Voltage Operating Temperature
VDD TOP
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ELECTRICAL CHARACTERISTICS * DC Characteristics
DVDD=AVDD=2.7V ~ 3.3V,DGND=AGND=0V,Ta= -10 ~ +70C
Parameter "H" Input Voltage "L" Input Voltage "H" Output Voltage "L" Output Voltage "H" Input Current *1 "L" Input Current *1 "H" Input Current *2 "L" Input Current *2 Operating Current Consumption Powerdown Current Consumption
Symbol
VIH VIL VOH VOL IIH1 IIL1 IIH2 IIL2 IDD IDDS1 IDDS2
Conditions DGND=AGND=0V -- IOH=40A IOL=2mA VIH=VDD VIL=0V VIH=3.0V VIL=0V SPOUT Output No Load Ta= -10 ~ +50C Ta= +50 ~ +70C
Min. 0.8 X VDD -- VDD - 0.3 -- -- -10 10 -10 -- -- --
Typ. -- -- -- -- -- -- -- -- 40 -- --
Max. -- 0.2 X VDD -- 0.45 10 -- 100 -- TBD 10 100
Unit V V V V A A A A mA A A
Note:
1. Applicable only to those input pins without a pull-down resistor. 2. Applicable only to those input pins with a pull-down resistor. (REC1, REC2, PLAY1, PLAY2, ERASE pins)
ML2502 Data Sheet (Revision 8.0)
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AC Characteristics
DVDD=AVDD=2.7V ~ 3.3V,DGND=AGND=0V,Ta= -10 ~ +70C At fsamp = 6.4 kHz
tPOR Min. "H" Pulse Width for Record-Start Input tWRECST 256 Min. "L" Pulse Width for Record-Stop Input tWRECSP 17 Min. Pulse Width for Playback-Start Input tWPLYST 17 Min. Pulse Width for Playback-Stop Input tWPLYSP 17 Min. Pulse Width for Erase-Start Input to REC1,REC2 tWERSST 17 Setup Time for Erase Input - REC1, REC2 Input 0 tWERSS 0 Hold Time for Erase Input - REC1, REC2 Input tWERSH Powering Up Time 1 (at Erasing) 15.4 tWS1 Powering Up Time 2 252 tWS12 Max. Record/Playback Time Length (2-phrase mode) *1 9.5 tWRP2 Max. Record/Playback Time Length (1-phrase mode) *1 19 tWRP1 Erase Execution Time *1 52 tWE Max. Time for MON to Fall Down at Stop Recording*1 14.8 tWS3 Powering Down Time 14.8 tWS4
Parameter Power-on Reset Time
Symbol
Min. --
Typ. -- -- -- -- -- -- -- -- 15.6 256 10 20 54 15.6 15.6
Max. 10 -- -- -- -- -- -- -- 15.8 279 10.5 21 56 16.5 16.5
Unit ms ms ms ms ms ms s s ms ms s s ms ms ms
Note:
*1.
In proportion to sampling frequency.
ML2502 Data Sheet (Revision 8.0)
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Analog Circuit Characteristics
DVDD=AVDD=2.7V ~ 3.3V,DGND=AGND=0V,Ta= -10 ~ +70C
Parameter MIN Input Resistance Mic. Amp. Voltage Gain Control Range LIN Input Impedance Line Amp. Open-loop Gain Output Voltage from MOUT, LOUT, AOUT on Powering Up and Powering Down Output Voltage from SPOUT +/on Powering Up and Powering Down MOUT- LOUT Load Resistance SPOUT+ / SPOUTAmplifier Open-loop Gain SPOUT+/SPOUT- Voltage Gain SPIN Input Impedance SPOUT +/- Output "H" Voltage SPOUT +/- Output "L" Voltage SPOUT Output Offset Voltage SPOUT Output Load Impedance SPOUT Load Current at Peak Output
Symbol
RMIN 28 -- -- 8 GMIC -- 1 -- -- RIOP fIN = 0~4kHz -- -- 40 GOLINE VMOTP 1.35 1.45 VLOTP tWS12 and tWS4 1.25 VAOTP 1/2 VDD 1/2 VDD VSPOTP 1/2 VDD tWS12 and tWS4 -0.1 +0.1 VSNOTP -- -- -- 200 ROOP GOSP GSPC RISP VSPH VSPL VOFF RSPC ISPO
fIN = 0~4kHz -- -- IOH = 10mA IOL = 10mA
No Signal Playback
Conditions --
Min. 4.2
Typ. 6
Max. 7.8
Unit k V/V M dB V
V k dB V/V M V V V mA
40 0.95 1
VDD-0.25
-- 1 -- -- -- -- -- --
-- 1.05 -- -- 0.25 0.3 -- 125
-- -- 16 --
-- --
ML2502 Data Sheet (Revision 8.0)
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n TIMING CHARTS u Digital Circuit Section * Powering Up 2.5V
VDD Internal Reset Signal
Status
Unstable State
Reseting
Power Down State
tPOR
Switch Input Allowed
* Start Recording Phrase 1
tWRECST
REC1 REC2 MON Status
Power Down State Powering Up Time Recording
tWS12
tWRP1,tWRP2
* End Recording Phrase 1 (Recording reaches to the last address)
REC1 REC2 MON Status
Recording Powering Down Power Down State
tWRP1,tWRP2
tWS4
ML2502 Data Sheet (Revision 8.0)
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* Stop Recording Phrase 1 (Recording stopped before the last address)
tWRECSP
REC1 REC2 MON Status
Recording Post-Recording Process Powering Down Power Down State
tWS3
tWS4
* Start Playback Phrase 1
tWPLYST
PLAY1 PLAY2 MON Status
Power Down State Powering Up Time Playing Back
tWS12
tWRP1,tWRP2
* End Playback Phrase 1 (Playback reaches to the last address)
PLAY1 PLAY2 MON Status
Playing Back Powering Down Power Down State
tWRP1,tWRP2
tWS4
ML2502 Data Sheet (Revision 8.0)
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* Stop Playback Phrase1 (Recording stopped before the last address)
tWPLYSP
PLAY1 PLAY2 MON Status
Playing Back Powering Down Power Down State
tWS4
* Start Erasing Phrase 1
tWERSS
ERASE REC1 MON Status
Power Down State Powering Up Time Erasing
tWERSST
tWERSH
tWS1
tWE
* End Erasing Phrase 1
ERASE REC1 MON Status
Erasing Powering Down Power Down State
tWE
tWS4
ML2502 Data Sheet (Revision 8.0)
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u Analog Circuit Section
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Start Recording (Phrase 1)
REC1 MON MOUT LOUT AOUT SPOUT+ SPOUTGND Level
VMOTP VLOTP
GND Level GND Level
Hi-Z
Hi-Z
tWS12
Status Power Down Powering UP Recording
*
Stop Recording (Phrase 1)
REC1 MON MOUT LOUT AOUT SPOUT+ SPOUTGND Level Hi-Z
VMOTP VLOTP
GND Level
GND Level
Hi-Z
tWS3
Status Recording
Post-Recording Process
tWS4
Powering Down PowerDown
ML2502 Data Sheet (Revision 8.0)
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Start Playback (Phrase 1)
PLAY1 MON MOUT LOUT AOUT SPOUT+ SPOUTGND Level GND Level
GND Level
VAOTP VSPOTP VSNOTP
Hi-Z
Hi-Z
tWS12
Status Power Down
Powering UP Time
Playing Back
*
Stop Playback (Phrase 1)
PLAY1 MON MOUT LOUT AOUT SPOUT+ SPOUTVAOTP VSPOTP VSNOTP
GND Level GND Level
GND Level Hi-Z
Hi-Z
tWS4
Status Playing Back Powering Down Power Down State
ML2502 Data Sheet (Revision 8.0)
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Application Circuit Sample
Single-phrase Record/Playback, at 4 kHz sampling frequency and with a Dynamic Speaker.
1 2 3 4 5 6 7 8
NC DVDD REC1 REC2 PLAY1
NC SAM1 SAM2 ROSC DGND
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
ML2502
PLAY2 ERASE MIN MOUT LIN LOUT AVDD AVDD SPOUT+ NC
MON TEST NC NC AOUT SPIN AGND SPOUTAGND NC
LED
MIC
9 10 11 12 13 14 15
Speaker
ML2502 Data Sheet (Revision 8.0)
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