HOLTEK ht8972 User Manual
Features
·
Operating voltage: 4.5V~5.5V
·
ADM algorithm
·
Low noise
-
Echo mode: -85dB
-
Surround mode: -90dB
Applications
·
Television
·
Karaoke systems
General Description
The HT8972 is an echo/surround effect processor. It is
designed for various audio systems including karaoke,
television, sound equipments, etc. The chip consists of
a built-in pre-amplifier, VCO or Voltage Control OSC,
40Kb SRAM, A/D and D/A converters as well as delay
time control logic.
HT8972
Voice Echo
·
Low distortion rate
-
Echo mode: 1%
-
Surround mode: 0.2%
·
Built-in 40Kb SRAM
·
Automatic reset function
·
16-pin DIP/SOP package
·
Video disc player
·
Sound equipments
Its built-in 40Kb SRAM can generate delay time effect
and can control the delay time value through the exter
nal VCO resistor.
The VCO circuit can reduce external components and
make it easy to adjust the delay time.
-
Block Diagram
L P F 1 _ I N
V C C A G N D D G N D
L P F 1 _ O U T L P F 2 _ O U T L P F 2 _ I N O P 2 _ O U T O P 2 _ I N O P 1 _ I N O P 1 _ O U T C C 0 C C 1
C O M P
L P F 1
1 / 2 V C C
A U T O
R E S E T
L P F 2
D I
M O M I C L O C K
4 0 K B i t s
R A M
V C O
O S C _ OR E F
v c o
4 . 7 k
4 . 7 k
W
W
M O D
D E M
D O 0 D O 1
Rev. 1.00 1 December 23, 2008
Pin Assignment
Pad Assignment
HT8972
L P F 1 _ I N
1 6
1
V C C
2
R E F
V C O
C C 1
C C 0
1 6 D I P - A / S O P - A
R E F
3
4
5
6
7
8
H T 8 9 7 2
A G N D
D G N D
O S C _ O
D G N D
A G N D
L P F 1 _ O U T
1 5
L P F 2 _ O U T
1 4
L P F 2 _ I N
1 3
O P 2 _ O U T
1 2
O P 2 _ I N
1 1
O P 1 _ I N
1 0
O P 1 _ O U T
9
L P F 1 _ O U T
L P F 1 _ I N
V C C
L P F 2 _ O U T
L P F 2 _ I N
1 6
1
2
O S C _ O
3
V C O
1 5
1 4
( 0 , 0 )
6
5
4
C C 1
C C 0
7
O P 1 _ I N
O P 1 _ O U T
1 2 1 1
1 3
1 0
8
9
O P 2 _ I N
O P 2 _ O U T
Chip size: 2475´2065 (mm)
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Rev. 1.00 2 December 23, 2008
HT8972
Pad Coordinates
Pad No. X Y Pad No. X Y
1
2
3
4
5 147.425
6 395.225
7 587.425
8 835.225
-883.875
-865.105 -891.900
-564.105 -892.700
-44.775 -892.700
861.250 9 1027.425
10 907.375 890.431
11 715.175 890.429
12 467.375 890.431
-892.700
-892.700
-892.700
-892.700
13 275.175 890.429
14 60.790 879.700
15
16
-203.150
-783.875
Pad Description
Pad No. Pad Name I/O Internal Connection Description
1 DGND I
2 OSC_O O
3 VCO I
4 CC1
5 CC0
6 OP1_OUT O
7 OP1_IN I
8 OP2_IN I
9 OP2_OUT O
10 LPF2_IN I
11 LPF2_OUT O
12 LPF1_OUT O
13 LPF1_IN I
14 VCC I
15 REF I
16 AGND I
¾
¾
¾
¾¾
¾¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
Digital ground
System oscillator output
System oscillator input, system frequency adjustable pin
Current control 1
Current control 0
OP1 output
OP1 input
OP2 input
OP2 output
Low pass filter 2 input
Low pass filter 2 output
Low pass filter 1 output
Low pass filter 1 input
Analog and positive power supply
Analog reference voltage
Analog ground
Unit: mm
-892.700
868.440
861.250
Absolute Maximum Ratings
Supply Voltage...........................VSS-0.3V to VSS+6.0V
Input Voltage..............................V
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Rev. 1.00 3 December 23, 2008
-0.3V to VDD+0.3V
SS
Storage Temperature ............................-50°Cto125°C
Operating Temperature .............................-20°Cto70°
HT8972
Electrical Characteristics
Symbol Parameter
V
CC
I
CC
G
V
V
OMAX
THD Total Harmonic Distortion 5V
N
O
PSRR Power Supply Rejection Ratio 5V
Operating Voltage
Operating Current 5V
Voltage Gain 5V
Maximum Output Voltage 5V THD=10% 0.9 1.8
Output Noise Voltage 5V
Test Conditions
V
DD
Conditions
¾¾
Min. Typ. Max. Unit
4.5 5.0 5.5 V
¾¾
=47kW¾-0.9
R
L
Filter= A-Weighting ¾
Filter= A-Weighting ¾-85 -60
DV
=-20dBV (0.1Vrms)
CC
f=100Hz
¾-40 -30
Ta=25°C
15 30 mA
2.5 dB
Vrms
¾
0.7 1.5 %
dBV
dB
Rev. 1.00 4 December 23, 2008
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