TC9488FG [TOSHIBA]
Digital Echo IC for Karaoke; 数字回波IC卡拉OK
| 型号： | TC9488FG |
| 厂家： | 
TOSHIBA |
| 描述： | Digital Echo IC for Karaoke |
| 文件： | 总12页 (文件大小：321K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC9488FG
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC9488FG
Digital Echo IC for Karaoke
The TC9488FG is digital echo ICs for karaoke. The ICs
incorporate microphone amps and volume controllers, enabling a
digital echo system to be configured on a single chip.
Features
•
Incorporates a two-channel microphone amp with auto level
control (ALC), AD/DA converter, delay memory, and electronic
volume controllers.
•
•
•
Incorporates a 32-kHz sampling, 12-bit successive comparison
AD/DA converter.
Incorporates a delay memory (16-Kbit DRAM) which enables
128-ms (typ.) delay.
Weight: 1.08 g (typ.)
Microphone and echo levels are controlled by built-in volume controllers. They are controlled either by DC
voltage or controlled in serial by the MCU.
TC9488FG: Supports three-lead interface
•
•
•
The system clock is generated by the CR oscillator circuit.
The echo feedback amount is configured using analog circuits. The feedback level can be freely set.
The IC comes in 30-pin flat package.
Pin Connection
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TC9488FG
Block Diagram
System Block Diagram
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TC9488FG
Pin Description (Note 1)
Pin Number
Symbol
I/O
Function
Remarks
1
2
3
V
―
Digital supply voltage pin
DD
CSCC
OSCR
I
I
Capacitor connecting pin for CR oscillator (C = 68 pF)
Resistor connecting pin for CR oscillator (R = 5.6 kΩ)
When VOLST = “H” level, CS signal input pin
When VOLST = “L” level, DC control pin for MIC1 volume
5
6
7
VOL1 ( CS )
VOL2 (SCL)
I
I
I
When VOLST = “H” level, clock input pin
When VOLST = “L” level, DC control pin for MIC2 volume
Open drain output
Open drain output
When VOLST = “H” level, data input pin
When VOLST = “L” level, DC control pin for echo volume
VOL3 (SDA)
VRO
9
―
―
―
I
Reference voltage pin
10
11
13
14
15
16
17
18
20
21
22
23
25
V
Reference voltage pin (1/2 V
Analog supply voltage pin
Auto level control pin 1
)
REF
DD
VDA
ALC1
MC1N
MC1P
MC2P
MC2N
ALC2
VSA
I
MIC1 feedback signal input pin
MIC1 signal input pin
I
I
MIC2 signal input pin
I
MIC2 feedback signal input pin
Auto level control pin 2
Analog ground pin
I
―
O
I
MCO
MIC addition signal output pin
Pre-filter input pin
PRIN
ADIN
I
Pre-filter output signal or DC input pin
Post-filter output pin
DAOUT
O
Electronic volume control mode select pin
26
VOLST
I
When VOLST = “H” level, serial control (I2C bus/three-lead)
When VOLST = “L” level, DC level control
28
29
30
TEST
I
Test pin. Fix to “H” level for normal use
Microphone echo signal output pin
Digital ground pin
POOUT
O
―
V
SS
Note 1: With the TC9488FG, pins 4, 8, 12, 19, 24, and 27 are not connected (NC pins).
NC pins are normally open.
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TC9488FG
Operation
1. Oscillator circuit
The TC9488FG generates an internal system clock using the CR oscillator circuit. Connecting a
capacitance (C) of 68 pF and a resistance (R) of 5.6 kΩ sets the oscillator frequency to approx. 4 MHz and
the sampling frequency to 32 kHz.
Varying the external capacitance enables the oscillator frequency and sampling frequency for the system
clock to be adjusted. Varying the system clock enables the delay time to be adjusted.
Figure 1 shows the CR oscillator circuit.
1.1 How to determine oscillator frequency (f)
f [MHz] = 1532/(C [pF] × R [kΩ])
= 1532/(68 × 5.6)
≈ 4.0 MHz (Note 2)
Note 2: The oscillator frequency is a typical value (Ta =
25°C). Set the resistance to between 4.7 kΩ and
6.8 kΩ.
Figure 1
1.2 How to determine sampling frequency (fs)
CR Oscillator circuit
fs [kHz] = f/128
= 4.0/128
≈ 32 kHz
2. Microphone amps
The IC incorporates microphone amps with auto level control (ALC).
The microphone amp gain is typically 36dB.
When a signal from 0 to −46dB is input, the ALC circuit can control the output signal level.
Changing the external capacitor connected to the ALC circuit to a resistor sets the ALC circuit to off.
Figure 2 shows the microphone amp circuit.
When C = 4.7 µF, the attack and release times are as follows:
Attack time = Approx. 29 ms
Release time = Approx. 1.6 s
Setting the capacitance (C) to a smaller value enables the
attack and release times to be adjusted. When the ALC circuit
is not used, change the capacitor (*1) to a resistor (approx. 10
kΩ), and connect to GND line.
At power on, while the capacitor is being charged, no sound is
output. So, use a capacitance of 4.7 µF or less.
Figure 2
Microphone amp with ALC
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TC9488FG
AD/DA converter and digital delay circuit
3.
The AD/DA converter is a 12-bit successive comparison type. The sampling frequency when the system
clock operates at 4 MHz is 32 kHz.
The analog signal input from the AD converter is converted to 12-bit digital data. The digital delay circuit
compresses the 12-bit signal to 4-bit, writes it to delay RAM, then reads it. The 4-bit data read from delay
RAM is de-compressed to 12-bit. The 12-bit data are converted to analog signals by the DA converter and
output.
The area for delay RAM memory is 4096 words × 4 bits.
The echo delay time is 4096 words × (1/32 kHz) = 128 ms.
Figure 3 is a block diagram of the echo circuit.
Figure 3 Block diagram of echo circuit
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TC9488FG
4. Electronic volume controllers
The IC incorporates microphone input 1 (MIC1) and microphone input 2 (MIC2) volume and echo volume
controllers. The built-in volume controller operates in 16 steps. Using an external variable resistor, volume
can be controlled by the DC level or from the MCU using serial data.
The TC9488FG supports a three-lead interface.
4.1 Serial control timing
Figure 4 shows the serial control timing.
Figure 4 Serial control timing
Table 1 lists bits used to set the volume.
Table 1 Volume setting bits
MODE
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0
VOL1 setting
VOL2 setting
M3
M3
M3
M3
M2
M2
M2
M2
M1
M1
M1
M1
M0
M0
M0
M0
0
0
1
1
0
1
0
1
0
0
0
0
0
0
0
0
VOL3 setting
VOL1, 2, 3 setting
M3, M2, M1, M0: Volume setting data
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TC9488FG
4.2 Setting of microphone and echo volumes
Table 2 lists the microphone setting values and attenuation; Table 3 lists the echo volume setting
values and attenuation. The DC level settings are typical values.
Table 2 Microphone volume (VOL1, VOL2) attenuation
Serial Data Setting
DC Level Setting (V)
Attenuation (dB)
M3
M2
M1
M0
5.0
4.4
4.2
3.9
3.7
3.5
3.2
3.0
2.7
2.5
2.3
2.0
1.8
1.5
1.3
1.1
0.0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
−2
−4
−6
−8
−10
−12
−14
−16
−18
−20
−22
−24
−26
−28
−∞
Table 3 Echo volume (VOL3) attenuation
Serial Data Setting
DC Level Setting (V)
Attenuation (dB)
M3
M2
M1
M0
5.0
4.4
4.2
3.9
3.7
3.5
3.2
3.0
2.7
2.5
2.3
2.0
1.8
1.5
1.3
1.1
0.0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
−1
−2
−3
−4
−5
−6
−7
−8
−9
−10
−11
−12
−13
−14
−∞
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TC9488FG
Maximum Ratings (Ta = 25°C)
Characteristics
Symbol
Rating
Unit
Supply voltage
V
−0.3 to 6.0
V
V
DD
Input voltage
V
−0.3 to V
+ 0.3
in
D
DD
Power dissipation
Operating temperature
Storage temperature
P
200
mW
°C
°C
T
opr
−25 to 85
T
−55 to 150
stg
Electrical Characteristics (unless otherwise specified, Ta = 25°C, V = 5.0 V)
DD
DC characteristics
Test
Circuit
Characteristics
Symbol
Test Condition
Ta = −25~85°C
Min
Typ.
Max
Unit
Operating supply voltage
Operating supply current
Operating frequency
V
―
4.5
―
5.0
20
5.5
30
V
mA
MHz
V
DD
I
―
Fmck = 4 MHz
fs = 32 kHz typ.
DD
Fmck
V
―
―
4.0
4.0
―
Power-on reset voltage
―
―
4.25
por
V
× 0.8
DD
“H” level
V
―
―
―
―
V
V
IH
DD
Input voltage
Input current
V
DD
“L” level
V
0
IL
× 0.2
“H” level
“L” level
I
―
―
―
―
―
1.0
IH
µA
I
−1.0
―
IL
Volume control (when VOLST = “L”)
Test
Circuit
Characteristics
Hysteresis voltage
Symbol
Test Condition
Min
Typ.
Max
Unit
VH
―
―
―
―
―
―
0.12
0.26
1.1
―
―
V
V
V
V
Input step width
VST
Min level input voltage
Max level input voltage
VImin
VImax
―
0.8
―
4.95
4.8
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TC9488FG
AC Characteristics
Microphone amps and volumes
Test
Circuit
Characteristics
Microphone amp gain
Symbol
Test Condition
Min
Typ.
49.5
Max
51.5
Unit
dBV
Input 1-kHz sine wave,
−50dBV, MCO pin measured.
MICG
―
47.5
Input 1-kHz sine wave,
−25dBV.
MCO Output at ALC Operation
VM
VL
―
―
−0.8
1.7
3.2
dBV
dBV
Maximum Input at No ALC Operation
Input 1-kHz sine wave.
―
−47.5
―
Input 1-kHz sine wave. MCO
output clip limit vale at max
volume
Maximum Input 1 at ALC Operation
Maximum Input 2 at ALC Operation
VA1
VA2
―
―
―
―
−4.0
―
―
dBV
dBV
Input 1-kHz sine wave. MCO
output clip limit value at
6.5
microphone amp output point
POOUT output noise 1
POOUT output noise 2
NO1
NO2
―
―
VOL1~3: min
―
―
−90
−63
−85
−58
dBV
dBV
VOL1: max, VOL2: min,
VOL3: min
VOL1: min, VOL2: max,
VOL3: min
POOUT output noise 3
POOUT output noise 4
POOUT output noise 5
POOUT output noise 6
NO3
NO4
NO5
NO6
―
―
―
―
―
―
―
―
−64
−65
−60
−62
−59
−54
−54
−54
dBV
dBV
dBV
dBV
VOL1: min, VOL2: min,
VOL3: max
VOL1: max, VOL2: max,
VOL3: min
VOL1: max, VOL2: min,
VOL3: min
VOL1: min, VOL2: max,
VOL3: max
POOUT output noise 7
POOUT output noise 8
Volume 1, 2 attenuation
NO7
NO8
ATT1
―
―
―
―
―
―
−62
−59
−2.0
−54
−52
―
dBV
dBV
dB
VOL1~3: max
Ratio with one level higher
(excluding the minimum level)
Ratio with one level higher
(excluding the minimum level)
Volume 3 attenuation
Attack time
ATT2
―
―
―
―
―
―
―
−1.0
120
10
―
―
―
―
―
dB
ms
C = 47 µF
1 kHz Sine
(Note 3)
wave input,
T
ATK
RLS
−20dBV
→ −10dBV
C = 0.47 µF
(Note 3)
C = 47 µF
1 kHz Sine
1.6
(Note 3)
wave input,
Release time
T
―
s
−10dBV
→ −20dBV
C = 0.47 µF
0.15
(Note 3)
Note 3: External capacitor of ALC pin
Microcontroller interface (when VOLST = “H”)
Test
Circuit
Characteristics
Interface setup time
Symbol
Test Condition
Min
Typ.
Max
Unit
tIFS
tL
―
0.25
0.25
0.25
0.25
0.25
1.0
―
―
―
―
―
―
―
―
―
―
―
―
―
―
µs
µs
µs
µs
µs
µs
µs
Shift clock “L” duration
Shift clock “H” duration
Data setup time
―
tH
―
tDS
tDH
tIFH
tCSH
―
Data hold time
―
Interface hold time
CS “H” duration
―
―
0.25
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TC9488FG
AC Characteristics Test Points
TC9488FG three-lead interface
TC94588FG AC Test Circuit
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TC9488FG
Package Dimensions
Weight: 1.08 g (typ.)
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TC9488FG
RESTRICTIONS ON PRODUCT USE
030619EBA
• The information contained herein is subject to change without notice.
• The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of
TOSHIBA or others.
• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc..
• The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this
document shall be made at the customer’s own risk.
• The products described in this document are subject to the foreign exchange and foreign trade laws.
• TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced
and sold, under any law and regulations.
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