TDA9815 datasheet(8/40 Pages) PHILIPS

8 / 40 page

1998 Feb 11

Philips Semiconductors

Product speciﬁcation

Multistandard/MAC VIF-PLL with QSS-IF

and dual FM-PLL/AM demodulator

TDA9815

The AF amplifier consists of two parts:

1. The AF preamplifier for FM sound is an operational

amplifier with internal feedback, high gain and high

common mode rejection. The AF voltage from the PLL

demodulator, by principle a small output signal, is

amplified by approximately 33 dB. The low-pass

characteristic of the amplifier reduces the harmonics of

the intercarrier signal at the sound output terminal. An

additional DC control circuit is implemented to keep

the DC level constant, independent of process spread.

2. The AF output amplifier (10 dB) provides the required

output level by a rail-to-rail output stage. This amplifier

makes use of an input selector for switching to AM/FM

or mute state, controlled by the standard switching

voltage and the mute switching voltage.

Internal voltage stabilizer and 1

⁄2VP-reference

The bandgap circuit internally generates a voltage of

approximately 1.25 V, independent of supply voltage and

temperature. A voltage regulator circuit, connected to this

voltage, produces a constant voltage of 3.6 V which is

used as an internal reference voltage.

For all audio output signals the constant reference voltage

cannot be used because large output signals are required.

Therefore these signals refer to half the supply voltage to

achieve a symmetrical headroom, especially for the

rail-to-rail output stage. For ripple and noise attenuation

the 1

⁄2VP voltage has to be filtered via a low-pass filter by

using an external capacitor together with an integrated

resistor (fg = 5 Hz). For a fast setting to 1⁄2VP an internal

start-up circuit is added.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Notes

1. IP = 125 mA; Tamb =70 °C; Rth(j-a) = 60 K/W.

2. Machine model class B (L = 2.5

µH).

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage (pin 29)

maximum chip temperature

of 125

°C; note 1

7.0

voltage at pins 1 to 9, 11 to 19, 22, 23 and

26 to 32

0VP

ts(max)

maximum short-circuit time

−

V19

tuner AGC output voltage

13.2

Tstg

storage temperature

−25

+150

°C

Tamb

operating ambient temperature

−20

+70

°C

Ves

electrostatic handling voltage

note 2

−300

+300

SYMBOL

PARAMETER

CONDITIONS

VALUE

UNIT

Rth(j-a)

thermal resistance from junction to ambient

in free air

K/W

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