UTC TA7784P
LINEAR INTEGRATED CIRCUIT
DUAL PRE-AMPLIFIER FOR
AUTO-REVERSE
DESCRIPTION
The UTC TA7784P is a dual pre-amplifier for auto-reverse
type and W-cassette type tape player. This IC contains dual
pre-amplifier, forward/ reverse control switches and metal/
normal tape equalizer control switches.
FEATURES
*High voltage gain: G
VO
=95dB(typ) at Vcc=6V，f=1kHz
*Wide operating supply voltage(V
CC
= 3.5V~15V)
*No input coupling capacitor
*Low noise( VNI=1µVrms(typ) at Rg=600Ω,
BW=20Hz~20kHz, NAB EQ)
DIP-16
BLOCK DIAGRAM
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
VALUE
16
750
-25~75
-55~150
ABSOLUTE MAXIMUN RATINGS
(Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Vcc
PD
Topr
Tstg
UNIT
V
mW
°C
°C
Note: de-rated above Ta=25°C in the proportion of 6mW/°C.
ELECTRICAL CHARACTERISTICS
(Ta=25°C,Vcc=6V,Rg=600Ω, f=1kHz, unless otherwise specified）
PARAMETER
SYMBOL
TEST
TEST
MIN TYP MAX UNIT
CIRCUIT CONDITIONS
Quiescent Current
Open Loop Voltage Gain
Maximum Output Voltage
Total Harmonic Distortion
Equivalent Input Noise
ICCQ1
ICCQ1
GVo
VOM
THD
VNI
1
1
1
1
1
1
VIN=0, Normal EQ
VIN=0, Metal EQ
Cf=100µF,Rf=0
THD=0.5%
Vout=0.5Vrms
Rg=620Ω,NAB
BW:20Hz~20kHz
Metal EQ
Ripple Rejection
Cross Talk
Forward/ Reverse Cross
Talk
RR
CT
CT(F/R)
1
1
f=100Hz,Vin=1Vrms
Vout=0dBm
Vout=0dBm
50
60
55
60
70
dB
dB
dB
1.1
5.5
7
95
1.5
0.035
1
0.12
1.7
11
dB
Vrms
%
µVrms
mA
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
C8
4.7
µF
R
L
=10k
Ω
TEST CIRCUIT
(Pin Configuration and DC Voltage
R
f
=180kΩ
SW1-1
R3=12kΩ
C
f
=22
µF
a
SW2-1
b
100
µF
C6
0.01
µF
R4=18kΩ
R
NF
=330kΩ
Ch1
Out
Vcc
C10
100
µF
6
4
2
1
5
R6
Rg
AMP
Vcc
7
R7
R8
C3
M
SG
C
1
=100
µF
EQ SW
Bias
F/R SW
15
3
1
µF
47kΩ
F
R
9
C4
N
13
R9
620Ωx4
C5
AMP
11
SW2-2
a
C
f
=22
µF
b
12
10
C7
0.01
µF
SW1-2
14
R4=18kΩ
R3=12kΩ
16
8
100
µF
C8
4.7
µF
Ch2
Out
R
L
=10k
Ω
R
f
=180kΩ
R
NF
=330kΩ
*Gvo Test: SW1-1, 2: Off, SW2-1, 2:B
Pin Configuration and DC Voltage( Vcc=6V, Ta=25°C, Unless otherwise specified)
DC VOLTAGE
PIN
1 2
NO.
VALUE
(V)
3
4
5
2.2
6
2.2
7
2.2
8
GND
9 10 11 12 13 14
2.2 NC 2.2
2.2
2.2
2.2
15
Vcc/GND
16
2.2
Vcc 2.3 Vcc/GND 2.2
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
I
E
=100
µA
APPLICATION INFORMATION
1.Forward/Reverse select switch
1） Threshold voltage: Pin 3 is coupled to the base of
Q1( PNP-Tr) as Fig. 1 The threshold voltage is 0~0.3V
at reverse stage and is 1.1~Vcc at the Forward stage.
2） The recommended Forward/ Reverse select circuit is
shown in Fig. 2
3） I3(Fig. 1)=12µA,Ta=25°C。
3
I
3
Fig 1
2.Equalizer control switch
Pin 15 is coupled to the base of Q2( PNP Tr) as shown
Fig. 3. The emitter potential of Q2 is 2.6V. The threshold
voltage is 21~Vcc at Metal EQ stage and is 0~1.2V at the
Normal EQ stage.
30~50W
1.5V
F
R
1µF
3
Fig 2
3.C2/C3/C4/C5
Capacitor C2~C5 may be required for preventing a
instability caused by the pattern layout or interference of
external high frequency signal.
2.6V
15
Fig 3
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R110-010,A
FPGA/CPLD
