TDA1302T datasheet(8/18 Pages) PHILIPS

8 / 18 page

TDA1302_1

9 Wed Sep 14 13:30:56 1994

September 1994

Philips Semiconductors

Preliminary speciﬁcation

Data ampliﬁer and laser supply circuit for

CD player and read only optical systems

TDA1302T

Notes to the characteristics

1. The maximum input current is defined as the current in which the gain reaches its minimum. Increasing the supply

voltage to VDD = 5 V increases the maximum input current (see also Figs 4 and 5).

2. The gain increases if a larger supply voltage is used (see also Fig.6).

3. Icsin is the sum of the diode input currents 1 to 4; Itsin is the sum of the diode input currents 5 and 6.

4. Transresistance 120 k

Ω means LOW gain, selected if HG = logic 0 (see Table 1).

5. Transresistance 240 k

Ω means HIGH gain, selected if HG = logic 1 (see Table 1).

6. Output voltage swing will be: VSRRF = VRFMO = VRFO(p-p).

7. Refers to equalized output only.

For single speed the gain ratio is defined as gain difference between 1 MHz and 100 kHz, while the flatness delay

is defined up to 1 MHz (see also Fig.7). For double speed the gain ratio is defined as gain difference between 2 MHz

and 200 kHz, while the flatness delay is defined up to 2 MHz.

Transfer function

The equalized amplifier including Cext and Rext has the following transfer functions, where ‘rfe’ refers to equalized output

only and ‘rf’ refers to equalized and not equalized outputs.

FOR SINGLE SPEED (SP = LOGIC 1)

(1)

FOR DOUBLE SPEED (SP = LOGIC 0)

(2)

The denominator forms the denominator of a Bessel low-pass filter.

Table 2 Transresistance.

SYMBOL

DESCRIPTION

TYP.

UNIT

internally deﬁned

os/ω1 = ωod/ω2

internally deﬁned

1.094

internally deﬁned

0.691

od = 2 × ωos

internally deﬁned

17.6

× 10−6

rad/s

RRF

see Chapter “Characteristics”

−

Rext

external resistor

750

Ω

Cext

external capacitor

rfe

csin

----------

–









⁄

1 Q

⁄

2 ω2

⁄

------------------------------------------------------------------------

⁄

-----------------------

ext

------------------------------------------

rfe

csin

----------

–









⁄

1 Q

⁄

2 ω2

⁄

-------------------------------------------------------------------------

ext

------------------------------------------

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