TDA7786 datasheet(29/54 Pages) STMICROELECTRONICS

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TDA7786, TDA7786M

Electrical specifications

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

I3V3

Digital IO 3.3 V supply current

Maximum current specified

only in case generated from

Internal supply only

1. FM functional test from antenna mixer input to audio output.

2. In the typical application supplied from 5 V with a 27 Ω series resistor.

Test condition: maximum current load for minimum value, unloaded for maximum value.

3. When the 1.2 V supply is applied externally, and not using the internal 1.2 V regulator.

Test condition: FM functional test from antenna mixer input to audio output.

4. When the 3.3 V supply is applied externally, and not using the internal 3.3 V regulator.

Table 16. General key parameters (continued)

Symbol

Parameter

Test condition

Min

Typ

Max

Units

Table 17. FM - section

Symbol

Parameter

Test condition

Min

Typ

Max

Units

FM IMR Mixer

RF Gain

Voltage gain (mix in -> s.e. test

output)

RF gain 0

RF gain 1(1)

RF gain 2

RF gain 3

Vnoise low

gain

Input noise voltage (RF gain 0)

Rsource=1.25 kΩ, noiseless

2.3

2.9

nV/

Hz

Rsource=0

2.1

2.6

Vnoise high

gain

Input noise voltage (RF gain 3)

Rsource=1.25 kΩ, noiseless

1.9

2.4

nV/

Hz

Rsource=0

1.6

2.0

IIP3

3rd order intercept point

RF gain 0, up to Vin/tone = 92 dBµV

RF gain 3, up to Vin/tone = 86 dBµV

124

119

127

122

-dBµV

FM AGC

RFAGC-Thr

RFAGC threshold, referred to

mixer input;

RF level

min setting, reg8<14> =1

85.4

88.4

91.4

dBµV

max setting, reg8<14>=1

min setting, reg8<14>=0

88.4

91.4

94.4

max setting, reg8<14>=0

Threshold steps

1.3

1.8

2.3

Threshold error

@ Tamb

-1.5

1.5

Threshold temperature drift

0.016

dB/K

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