STV0056AF datasheet(16/27 Pages) STMICROELECTRONICS

16 / 27 page

SDA

µ/4µ

205

Ω

ESD

600

µ/2µ

GND 0V

Figure 17

Pins 30 - 29

37 - 48

J17 L - J17 R

U75 L - U75 R

Figure 18

µ/2µ

205

Ω

ESD

GND 0V

150

µA

Figure 19

460

Ω

XTL

GND 0V

5pF

460

Ω

Figure 20

Pins 35-49

CPUMP L

CPUMP R

VCO Input

µA

Loop Filter Tracking

100

µA

100

µA

Dig Synth

Figure 21

SDA

Input same as above.

Output pull down only : relies on external resistor

for pull-up.

J17 L, J17 R, U75 L, U75 R

I1 - I2 = 2 x audio / 18k

Ω.eg 1VPP audio : ±55µA.

The are internal switches to match the audio level

of the different standards.

Input with CMOS levels.

XTL

CPUMP L, CPUMP R

An offset on the PLL loop filter will cause an offset

in the two 1

µA currents that will prevent the PLL

from drifting-off frequency.

DET L, DET R

I2 - I1 = f (phase error).

REF 2.4V

Pin 38

Pin 46

AMPLK L

AMPLK R

10k

Ω

160

µA

Pin 22

Pin 39

AGC L

AGC R

To VCA

Figure 23

AMPLK L, AMPLK R, AGC L, AGC R

I2 and I1 from the amplitude detecting mixer.

Pins 36 - 47

DET L - DET R

Figure 22

PIN INTERNAL CIRCUITRY (continued)

STV0056AF

16/27

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