TDA9845 데이터 시트보기 (PDF) - Philips Electronics
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TDA9845 Datasheet PDF : 20 Pages
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Philips Semiconductors
TV and VTR stereo/dual sound processor
with digital identification
Preliminary specification
TDA9845
Power supply
The different supply voltages and currents required for the
analog and digital circuits are derived from an internal
band-gap reference circuit. The AF reference voltage is
1⁄2VP. For a fast setting to 1⁄2VP an internal start-up circuit
is added. A good ripple rejection is achieved with the
external capacitor Cref = 100 µF/16 V in conjunction with
the high ohmic input of the 1⁄2VP pin (pin 7). No additional
DC load on this pin is allowed.
ESD protection
All pins are ESD protected. The protection circuits
represent the latest state of the art.
Internal circuit
The internal pin loading diagram is given in Fig.7.
Power-on reset
When a power-on reset is activated by switching on the
supply voltage or because of a supply voltage breakdown,
the 117/274 Hz DPLL, the 117/274 Hz integrator and the
logic will be reset. The AF channel (Main) is muted
(≤1 ms).
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VP
Vi
Vi
Vi
Tstg
Tamb
Vesd
PARAMETER
supply voltage (pin 18)
voltage at pins 1, 2 and 20
voltage at pins 3 to 13, 17 and 19
voltage at pins 14 and 15
storage temperature
operating ambient temperature
electrostatic handling for all pins
CONDITIONS MIN.
−0.3
−0.3
−0.3
−0.3
−25
note 1
0
−500
MAX.
10
9.0
VP
10
+150
+70
+500
Note
1. Charge device model class A: discharging a 200 pF capacitor through a Ω series resistor.
UNIT
V
V
V
V
°C
°C
V
THERMAL CHARACTERISTICS
SYMBOL
Rth j-a
PARAMETER
thermal resistance from junction to ambient in free air
DIP20
SO20
VALUE
73
90
UNIT
K/W
K/W
1995 Mar 20
7
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