Advertisement
Quick Links
OKI
ML2502 Demo Board
INSTRUCTION MANUAL
GENERAL DESCRIPTION
The ML2502 demonstration board is intended as a familiarisation and
demonstration tool to help design-in the ML2502 analog storage recorder LSI.
BOARD LAYOUT
ON
OFF
+3V
GND
SWITCHES DESCRIPTION
(1) POWER
(2) ERASE
(3) PLAY2
(4) PLAY1
(5) REC2
(6) REC1
(12)
POWER
(1)
(7)
1 2 3 4
OFF
(3)
(2)
ERASE
PLAY2
Turn on the POWER and LED (12).
Erase – enable signal input switch, used together with the
REC1 (6) and/or the REC2 (5).
Input start-playback signal for Phrase 2 to this switch.
Input start-playback signal for Phrase 1 to this switch.
Input start-recording signal for Phrase 2 to this switch.
Input start-recording signal for Phrase 1 to this switch.
PRELIMINARY version
(11)
MON
(8)
SP.GAIN
ML2502
(5)
(4)
PLAY1
REC2
1
ML2502 Demo Board
1999.03.19 ver1.0
SPEAKER
(9)
MICROPHONE
(10)
(6)
REC1
Advertisement
Related Manuals for Oki ML2502
Summary of Contents for Oki ML2502
- Page 1 ML2502 Demo Board ML2502 Demo Board 1999.03.19 ver1.0 PRELIMINARY version INSTRUCTION MANUAL GENERAL DESCRIPTION The ML2502 demonstration board is intended as a familiarisation and demonstration tool to help design-in the ML2502 analog storage recorder LSI. BOARD LAYOUT (12) (11) POWER SPEAKER SP.GAIN...
- Page 2 During recording and playback, turn on the LED. RECORD and PLAYBACK OPERATION ML2502 has two record/playback modes, Dual-phrase record/playback mode and Single-phrase 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.
- Page 3 ML2502 Demo Board 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.
- Page 4 ML2502 Demo Board 1-2. 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.
- Page 5 ML2502 Demo Board 1-3. 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. After Phrase 1 having been erased, the LSI automatically shifts to power-down mode for low-power consumption.
- Page 6 ML2502 Demo Board Start Invalid Input Stop REC1 REC2 Status Power Down Powering Up Recording Powering Down Power Down Stopping Process Figure 1.4 Timing Chart for Phrase 2 Recording Operation 1-5. 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.
- Page 7 ML2502 Demo Board 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.
- Page 8 ML2502 Demo Board Start Invalid Input Stop REC1 REC2 PLAY1 PLAY2 Status Power Down Powering Up Recording Powering Down Power Down Stopping Process Figure 2.1 Timing Chart for Single-phrase Recording Operation 2-2. 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.
- Page 9 ML2502 Demo Board Start Pulse Invalid Input Stop Pulse PLAY1 PLAY2 REC1 REC2 Status Power Down Powering Up Playing Back Powering Down Power Down Figure 2.2 Timing Chart for Single-phrase Playback Operation 2-3. 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.
- Page 10 ML2502 Demo Board 3. Repeating Playback Operation 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.
-
Page 11: Circuit Diagram
ML2502 Demo Board CIRCUIT DIAGRAM 0.1µF 0.1µF DVDD AVDD DVDD DVDD REC1 SAM1 100kΩ REC2 SAM2 100kΩ DGND ROSC PLAY1 30kΩ DGND PLAY2 5.1kΩ DGND ERASE AOUT 0.47µF 50kΩ 0.47µF From Microphone SPIN HSJ- 20kΩ 0785 SPOUT- MOUT To Speaker 0.47µF...