TELEFUNKEN Semiconductors

U4313B

Rev. A1: 23.06.1995

4 (14)

Parameters

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

Clamping comparator

Typical common mode

input voltage range

Pin 2

0.8

1.6

V

Maximum distortion

voltage

R+ = R– = 50 k

W,

C+ = C– = 200 nF,

Pin 2

200

mV

Output voltage

(10 k

Pin 5

0

150

250

Output voltage

(10 k

Pin 5

Wake up circuit

Minimum wake up level

Pin 9

40

dB

Internal charging resistor

Pin 3

1.5

k

W

Threshold voltage

Pin 3

1.6

V

Output switch current

Pin 10

180

250

550

mA

Output switch voltage

Pin 10

5.5

External wake up resistor

Pins 3 and 13

22

k

W

External wake up capacitor

Pins 3 and 13

10

mF

Hold time (

± 30%)

 1.5

Delay time (

± 30%)

0.75 k

W

1)

IC version with non-inverting comparator available: U4311B

2)

Measured at Pin 9, referred to 330

W

3)

Protected by a Z-diode, see figure 13

4)

Valid for 0.1

Application

The U4313B is well-suited to implement UHF remote

control or data transmission systems, based on a low

current superheterodyne receiver concept. SAW-devices

may be used in the transmitter as well as in the receiver

local oscillator. The front end should be a discrete circuit

application with low-current UHF transistors like S822T

or S852T from TEMIC TELEFUNKEN microelectronic

GmbH. The frequency of the local oscillator can be deter-

mined either by coaxial resonators or SAW-devices. Due

to large SAW-resonator tolerance an IF-bandwidth

* and

in a FM-system additionally the discriminator amplitude

characteristic (figure 28)

* of 300 kHz or higher is pro-

posed. As the circuit needs only 3.0 V supply voltage for

operation, the front end may be a stacked design in order

to achieve a total receiver current consumption of approx-

imately 1 mA. Figure 29 shows a principle receiver

concept diagram. The application notes ANT012,

ANT013 and ANT015 contain more detailed information

on complete RF links.