TDA7705TR datasheet(17/42 Pages) STMICROELECTRONICS

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TDA7705

Electrical specifications

Doc ID 15938 Rev 9

17/42

3.4

Electrical characteristics

VCC = 4.7 V to 5.25 V; Tamb = -40 °C to +85 °C; unless otherwise specified.

3.4.1

FM - section

Table 7.

FM - section

Symbol

Parameter

Test condition

Min

Typ

Max

Units

FM IMR mixer

Rin

Input resistance

130

170



Vnoise

Input noise voltage

Mix 1, Rsource = 1.5 k,

noiseless

-2.5

3.1

nV/

Hz

Mix 2, Rsource = 800 ,

noiseless

-2

2.5

IIP3

3rd order intercept point

Mix 1

up to Vin/tone = 90 dBµV

Mix 2

up to Vin/tone = 85 dBµV

122

118

125

121

dBµV

FM AGC

RFAGC-Thr

RFAGC threshold, referred to

mixer input;

RF level

Mix 1, min setting

dBµV

Mix 1, max setting

Mix 2, min setting

Mix 2, max setting

Threshold steps

Threshold error

@ Tamb = 27 °C

-1.5

1.5

Threshold temperature drift

0.016

dB/K

IFAGC-Thr

IFAGC threshold, referred to

mixer input; at tuned

frequency

RF level

Mix 1, min setting

dBµV

Mix 1, max setting

Mix 2, min setting

Mix 2, max setting

Threshold steps

Threshold error

@ Tamb = 27 °C

-1.5

1.5

Threshold temperature drift

0.016

dB/K

Pin diode source current

@ Tamb = 27 °C; see note

(1)

Pin diode sink current

µA

Pin diode source current in

constant current mode

@ Tamb = 27 °C; see note

(1)

0.4

The current is generated by a PTAT (Proportional To Absolute Temperature) source, and has therefore a temperature

dependency described by:

I/Io = T/To, with Io being the current at ambient temperature (25 °C) and To the ambient

temperature (25°C) expressed in Kelvin, that is 298 K.

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