TDA1302T 参数 Datasheet PDF下载

TDA1302_1

9 Wed Sep 14 13:30:56 1994

Philips Semiconductors

Preliminary specification

Data amplifier and laser supply circuit for

CD player and read only optical systems

Notes to the characteristics

TDA1302T

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

voltage to V

DD

= 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. I

csin

is the sum of the diode input currents 1 to 4; I

tsin

is the sum of the diode input currents 5 and 6.

4. Transresistance 120 kΩ means LOW gain, selected if HG = logic 0 (see Table 1).

5. Transresistance 240 kΩ means HIGH gain, selected if HG = logic 1 (see Table 1).

6. Output voltage swing will be: V

SRRF

= V

RFMO

= V

RFO(p-p)

.

7. Refers to equalized output only.

8.

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 C

ext

and R

ext

has the following transfer functions, where ‘rfe’ refers to equalized output

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

F

OR SINGLE SPEED

(SP =

LOGIC

1)



2



2

V

rfe

1

1



1

–

ks

 ⁄ ω

os

-

-

---------

=

R

rf

×

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

×

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

×

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

-

2

2

1

+

s

⁄ ω

1

1

+

sR

ext

×

C

ext

I

csin

1

+

1

⁄

Q

×

s

⁄ω

+

s

⁄ω

os

os

(1)

F

OR DOUBLE SPEED

(SP =

LOGIC

0)



2



2

V

rfe

1



1

–

ks

 ⁄ ω

os

-

-

---------

=

R

rf

×

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

×

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

-

2

2

1

+

sR

ext

×

C

ext

I

csin

1

+

1

⁄

Q

×

s

⁄ω

+

s

⁄ω

od

od

(2)

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

Table 2

Transresistance.

SYMBOL

k

ω

os

/ω

1

=

ω

od

/ω

2

Q

ω

od

= 2

× ω

os

R

RF

R

ext

C

ext

DESCRIPTION

internally defined

internally defined

internally defined

internally defined

see Chapter “Characteristics”

external resistor

external capacitor

4

1.094

0.691

17.6

×

10

−6

−

750

47

Ω

pF

rad/s

TYP.

UNIT

September 1994

9