U2795B

Pin Description

VS 1

RFI 2

P3

SO 4

8 PD

7 LOi

6 GND

5 IFO

94 7890 e

TELEFUNKEN Semiconductors

Pin Symbol

Function

1 VS Supply voltage

2 RFi RF input

3 P Progamming port IP3, CP

4 SO Output symmetry

5 IFO IF output

6 GND Ground

7 LOi LO input

8 PD Power down

Functional Description

Supply Voltage

The IC is designed for a supply voltage of 2.7 to 5.5 V. As

the IC is internally stabilized, the performance of the

circuit is nearly independent of the supply voltage.

Input Impedance

WInput impedance, ZRFi, is about 700 with an additional

capacitive component. This condition provides the best

noise figure in combination with a matching network.

3. Order Intercept Point (IP3)

Voltage divider, RP / R1, determinates both the input and

output intercept point, IIP3 and OIP3. If RP is infinity the

IIP3 has the maximum of about – 4 dBm.

Current Consumption, IS

Depending on the chosen input and output conditions of

the IC, the current consumption, IS, is between 4 mA and

10 mA. The current consumption in dependence of Rp is

shown in figure 4.

Power Down

This feature provides an extension of battery life. If this

function is not used, Pin 8 has to be connected to VS

(Pin 1).

Output Symmetry

The symmetry of the load current can be matched and so

be optimized for a given load impedance.

The IP3/RP characteristics are shown in figure 1 and 2.

Output Impedance and Intercept Point

Output impedance is shown in figure 9.

Both low output impedance and a high intercept point are

with reference to a high value of RP.

2 (13)

Rev. A2: 08.06.1995