GENERAL DESCRIPTION
Thanks to newly developed Analog Multi-Level Storage technology, ML2500B stores non-compressed analog source signal directly into on-chip 1M Bit-Cell Flash memory. The result is superb sound quality without noise and distortions introduced through coding/decoding, and impressive long-time record/playback capability up to 256 sec. ML2500B is fully controllable by an external MCU via the industry’s standard Serial Peripheral Interface.
In addition, no backup requirement and low operating voltage (2.7 to 3.3 V) make the LSI an ideal choice for compact, handy and portable terminals. ML2500B is a true single-chip solution to record/playback subsystem for use with today’s size-critical electronic products.

FEATURES
• On-chip non-volatile 1M bit-cell Flash memory
    Program/Erase Cycles: 10,000 cycles
    Data Retention : 10 years
• MCU Interface
    Serial Peripheral Interface (SPI; Mode 0)
• Record/Playback Time Length (With the int. Osc. or ext. clock at 8.192 MHz)
    Approx. 160 sec (At fsam = 6.4 kHz)
    Approx. 190 sec (At fsam = 5.3 kHz)
    Approx. 256 sec (At fsam = 4.0 kHz)
• Selectable Sampling Frequencies
    4.0 kHz, 5.3 kHz, 6.4 kHz
• Maximum number of recording phrases: 320 phrases
• Phrase Control
    Fully controllable with user-definable Start, Stop addresses
• Built-in LPF/Smoothing Filter (LPF attenuation –40 dB/oct)
• Built-in Oscillation Circuit (8.192 MHz), No oscillator required
    Optional external clock input (Clock Frequency 4.0 to 8.192 MHz)
• Power Supply : 2.7 to 3.3 V
• Operating Temperature:
    –40 to +70°C (guaranteed for both function and voice quality)
    –40 to +85°C (guaranteed for function only) *Notice
    *Notice
    The voice quality can deteriorate at temperatures beyond the range of –40 to +70°C.
    DC and AC characteristics in this data sheet are specified for –40 to +70°C operating temperature range.
• Package:
    32-pin Plastic TSOP (TSOP(1)32-P-814-0.50-1K) (Product name: ML2500BTA)
    Note: Please contact the Oki Sales office/Distributors for bare chips.