ROHM BU9252S, BU9252F Datasheet

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Multimedia ICs

Audio digital delay (KARAOKE echo)

BU9252S / BU9252F

The BU9252S and BU9252F are digital delays specifically for Karaoke systems. Each has an internal sample hold
circuit, an 8-bit A / D and D / A converter and 2kB SRAM, and allows for the selection of one of eight delay times just
by attaching an inexpensive ceramic resonator.
A digital echo system can be formed by using either of these ICs together with the BA7725S or BA7725FS.

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Applications
Karaoke echo system
Electronic circuits that require signal delays

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Features

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Block diagram

1

S / H

A

IN

AGND

A

OUT

AVDD

DCNT0

DCNT1

DCNT2

GND

V

DD

TST0

TST1

TST2

TDIN

TDO0

TDO1

OSCI

OSCO

S / H

8 × 2k SRAM

ADDRESS COUNTER

AND

MAIN TIMING

8bit

A / D

8bit

D / A

TEST CIRCUIT

2

354

6

7

8

9

18

17

16

15

14

13

12

11

10

1) Internal digital delay circuit.

2) Internal 8-bit A / D converter. Sample rate. (14.22kHz

when f

OSC = 455kHz).

3) Internal 2k bytes data SRAM.

4) Internal 8-bit D / A converter.

5) CMOS design for low power consumption.

6) Internal sample hold circuit.

7) Internal feedback resistors and capacitors for oscilla­tor circuits.

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Multimedia ICs BU9252S / BU9252F

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Pin descriptions

Pin name
1 S / H 10 OSCO
2A

IN 11 OSCI

3 AGND 12 TDO1
4A

OUT 13 TDO0

5AV

DD 14 TDIN

6 DCNT0 15 TST2
7 DCNT1 16 TST1
8 DCNT2 17 TST0
9 GND 18 V

DD

Pin No. Function Pin No. Pin name

Analog input

Analog output
Analog circuit power supply
Delay setting input
Delay setting input
Delay setting input

Function

For attaching sample-and-hold capacitor

Analog circuit ground

Digital circuit ground

Test pin (output)
Test pin (output)
Test pin (input)
Test mode setting
Test mode setting
Test mode setting
Digital circuit power supply

Oscillator pin 1

Oscillator pin 2