INTEGRATED CIRCUITS
DATA SHEET
TEA0677T
Dual pre-amplifier and equalizer for
reverse tape decks
Product specification
File under Integrated Circuits, IC01
August 1993
Philips Semiconductors
Product specification
Dual pre-amplifier and equalizer for
reverse tape decks
FEATURES
•
Head pre-amplifiers
•
Reverse head switching
•
Equalization with electronically switched time constants
•
0 dB = 387.5 mV
•
Pin compatible to TEA0675 Dolby B, music search IC.
GENERAL DESCRIPTION
TEA0677T
The TEA0677T is a monolithic bipolar integrated circuit
intended for applications in car radios. It includes head and
equalization amplifiers with electronically switchable time
constants. Furthermore it includes electronically
switchable inputs for tape drives with reverse heads. The
device is intended to replace the regular TEA0675T in
low-cost car radios using the same PCB. External
components that are necessary for Dolby B and music
search features can be omitted.
The device will operate with power supplies in the range of
7.6 V to 12.0 V, output overload level increasing with
increase in supply voltage. Current drain varies with
supply voltage, so it is advisable to use a regulated power
supply or a supply with a long time constant.
QUICK REFERENCE DATA
SYMBOL
V
CC
I
CC
(S + N)/N
supply voltage
supply current
signal-plus-noise to noise ratio
PARAMETER
7.6
−
68
MIN.
10
23
74
TYP.
12
26
−
MAX.
V
mA
dB
UNIT
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
TEA0677T
Note
1. SOT137-1; 1996 August 27.
PACKAGE
PINS
24
PIN POSITION
SO
MATERIAL
plastic
CODE
SOT137A
(1)
August 1993
2
This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in
_white
to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in
white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...
August 1993
3
Product specification
Instead of potentiometers at EQ AMP
fixed resistors may be used. The value
depends on applied heads.
Philips Semiconductors
Dual pre-amplifier and equalizer for
reverse tape decks
TEA0677T
Fig.1 Block and application diagram.
Philips Semiconductors
Product specification
Dual pre-amplifier and equalizer for
reverse tape decks
PINNING
SYMBOL
OUTA
n.c.
n.c.
n.c.
n.c.
n.c.
EQA
EQFA
V
CC
INA1
V
REF
INA2
INB2
HS
INB1
GND
EQFB
EQB
EQS
n.c.
ACUR
n.c.
n.c.
OUTB
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DESCRIPTION
output channel A
not connected
not connected
not connected
not connected
not connected
equalizing output channel A
equalizing input channel A
supply voltage
input channel A1 (forward or
reverse)
reference voltage
input channel A2 (reverse or
forward)
input channel B2 (reverse or
forward)
head switch input
input channel B1 (forward or
reverse)
ground
equalizing input channel B
equalizing output channel B
equalizing switch input
not connected
auxiliary current
not connected
not connected
output channel B
TEA0677T
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
Head switching
is achieved when pin 14 (HS) is
connected to GND via a 27 kΩ resistor (inputs INA2, INB2
active), or left open-circuit (inputs INA1, INB1 active).
The 10
µF
capacitor at pin 14 sets the time constant for
smooth switching.
Time constant switching for equalization
(70
µs/120 µs)
is achieved when pin 19 (EQS) is
connected to ground via an 18 kΩ resistor (120µs) or left
open-circuit (70
µs).
August 1993
4
Philips Semiconductors
Product specification
Dual pre-amplifier and equalizer for
reverse tape decks
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC134).
SYMBOL
V
CC
V
I
t
short
T
amb
T
stg
T
s
V
es
DC supply voltage
input voltage (pin 1 to 24) except pin 11 (V
REF
) to V
CC
pin 11 (V
REF
) to V
CC
short-circuiting duration
operating ambient temperature
storage temperature
soldering temperature (wave solder for 10 s at lead)
electrostatic handling (note 1)
PARAMETER
0
−0.3
−
−40
−65
−
−
MIN.
TEA0677T
MAX.
16
V
CC
5
+85
+150
260
−
V
V
s
°C
°C
°C
−
UNIT
Note to the Limiting values
1. Classification A: human body model; C = 100 pF, R = 1.5 kΩ, V
≥
2 kV; charge device model; C = 200 pF, R = 0
Ω,
V
≥
500 V.
CHARACTERISTICS
V
CC
= 10 V; f = 20 Hz to 20 kHz; T
amb
=
+25 °C;
all levels are referenced to 387.5 mV (RMS; 0 dB) at output; see Fig.1;
EQ switch in the 70
µs
position; unless otherwise specified.
SYMBOL
V
CC
I
CC
PARAMETER
supply voltage
supply current
channel matching
THD
total harmonic distortion 2nd and 3rd
harmonic
head room at output
PSRR
α
CS
α
CC
R
Lmin
G
v
V
off
I
B
R
EQ
R
I
power supply ripple rejection
channel separation
crosstalk between active and inactive
input
minimum load resistance at output
voltage gain (pre-amplifier) from input
pins 10, 12, 13 and 15 to pin EQF
input offset voltage
input bias current
equalizing resistor
input resistance head inputs
pins 10, 12, 13 and 15
connected to V
REF
f = 1 kHz; V
O
= 0 dB
f = 1 kHz; V
O
= 0 dB
f = 10 kHz; V
O
= 6 dB
V
CC
= 7.6 V;
THD = 1%; f = 1 kHz
0.25 V (RMS);
f = 1 kHz; see Fig.3
f = 1 kHz; V
O
= +10 dB; 64
see Fig.4
f = 1 kHz; V
O
= +10 dB 70
f = 1 kHz; V
O
= 12 dB;
THD = 1%
f = 1 kHz
29
−
−
4.7
60
30
2
0.1
5.8
100
31
−
0.4
6.9
−
dB
mV
µA
kΩ
kΩ
10
77
−
−
−
dB
kΩ
70
−
dB
45
50
−
dB
−0.5
−
−
12
−
0.04
0.08
14
+0.5
0.1
0.15
−
dB
%
%
dB
CONDITIONS
−
MIN.
7.6
10
23
TYP.
MAX.
12
26
UNIT
V
mA
August 1993
5
京公网安备 11010802033920号
EEWORLD
