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Datasheet: YD7738 (No company)

PREAMPLIFIER FOR PLAY OR RECORDER

 

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No company
YOUDA INTEGRATED CIRCUIT
YD7738
PREAMPLIFIER FOR PLAY OR RECORDER
--YD7738
DESCRIPTION
The YD7738 is an amplifier system designed for a radio cassette recorder.
FEATURES
*Recorder play back for Pre amplifier;
*Buffer amplifier (Recorder amplifier);
*Power amplifier;
*Wide operating voltage (3.5V to 9V)
BLOCK DIAGRAM
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
_
+
PRE AMP
ALC
BUFFER AMP
FILTER
POWER AMP
+
_







WuXi YouDa Electronics Co., Ltd
Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China
Tel: 86-510-85205117 86-510-5205106 Fax: 86-510-85205110 Website: www.e-youda.com
SHENZHEN OFFICE Tel 86-755-83740369 Fax 86-755-83741418
Ver 5.0 1 of 4 2006-06-30
YOUDA INTEGRATED CIRCUIT
YD7738
PIN DESCRIPTION
PIN
Name
Description
PIN
Name
Description
1 IN
ALC
ALC
input 9 BS
BS
2 OUT
BUF
Buffer amplifierinput
10
Vcc
Supply voltage
3 NF
BUF
Negative feed back of
Buffer amplifier
11 FIL
Filter
input
4 NC
NC
12 FIL
Filter
input
5 IN
P
Power amplifier input
13
OUT
PRE
Pre-amplifier
output
6 NF
P
Negative feed back of
Power amplifier
14 NF
PRE
Negative feed back of
Pre-amplifier
7 GND
P
Power
GND 15
IN
PRE
Pre-amplifier
input
8 OUT
P
Power amplifier output
16
GND
PRE
Pre-GND
ABSOLUTE MAXIMUM RATINGS
(Tamb=25)
PARAMETER SYMBOL VALUE
UNIT
Supply Voltage
Vcc
14
V
Output Current
Iop
1.5
A
Power Dissipation
P
D
1.2 W
Operating Temperature
Tamb
-20 to+75
Storage Temperature
Tstg
-55 to 150
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, Vcc=6V, f=1kHz, Tamb=25
PARAMETER SYMBOL
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
Total
Vcc=3.5V 7.5
mA
Quiescent Current
Iccq
Vcc=6V 11
35
mA
Pre-Amplifier
Open Loop Voltage Gain
Gvo1
55 70 dB
Closed Loop Voltage Gain
Gv1
40
dB
Max. Output Voltage
V
OM1
THD1.0%
0.7 V
Input
Impedance
Zi
Vo=0.5Vrms
30 k
Equivalent Input Noise
Voltage
V
NO
1
Rg=0
1.4
2.5
V
WuXi YouDa Electronics Co., Ltd 2 of 4 Website: www.e-youda.com
YOUDA INTEGRATED CIRCUIT
YD7738
Pre Amplifier + Buffer Amplifier
Closed Loop Voltage Gain
Gv2
Pre-Amp: Gv=40dB
Buff-Amp: Gv=20dB
60 dB
Max. Output Voltage
Vo2
THD=3.0%
1.5
1.7
V
Equivalent Output Noise
Voltage
V
NO2
Rg=0,
Gv2=60dB 1.2
2.5
mV
ALC Effect
ALC1
V
IN
=
-60dBm-20dBm
2 dB
ALC Range
ALC2
THD1.0%
60 dB
Power Amplifier
Open Loop Voltage Gain
Gvo3
60
70
dB
Closed Loop Voltage Gain
Gv3
40
dB
R
L
=4,THD=10% 0.8 0.96
Maximum Out Power
P
OM
Vcc=9V,R
L
=4,
THD=10%
2.0
W
Output Noise voltage
V
NO3
Rg=0,Gv=40dB 0.3 mV

APPLICATION CIRCUIT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
51k
Rf
6.2k
+
47
+
10
1000p
330
680p
YD7738
0.082
4
SPEAKER
+
3.3
+
47
+ 1000
1k
560p
0.022
10k
+
3.3
+
100
+
330
560p
0.01
12k
27k
330k
220
0.01
+
0.47
+
22
+
220
390k
5.6k
+
47
+
1
RADIO
MIC
R/P
BIAS
RECORDING EQ
T
R
S1
S2
S3
S6
S
S5
R
T
S
S4
HEAD
REC
ATT
Vcc
WuXi YouDa Electronics Co., Ltd 3 of 4 Website: www.e-youda.com
YOUDA INTEGRATED CIRCUIT
YD7738
1 Rf (pin6) controls the gain of power amplifier
Rf (pin6) value
180 200 220
Gain of power amplifier
42dB
40 dB
38 dB

#2 S1----S6 apply at play estate

OUTLINE DRAWING







WuXi YouDa Electronics Co., Ltd 4 of 4 Website: www.e-youda.com
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