STV0056 datasheet(15/26 Pages) STMICROELECTRONICS

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180

µ/2µ

MUX

100

µ/2µ

I/O/22kHz

µ/2µ

205

Ω

ESD

IIC Reg

22kHz

Figure 15

SCL

µ/4µ

205

Ω

ESD

Figure 16

SDA

µ/4µ

205

Ω

ESD

600

µ/2µ

GND 0V

Figure 17

J17 L

J17 R

U75 L

U75 R

Figure 18

µ/2µ

205

Ω

ESD

GND 0V

150

µA

Figure 19

750

µA

460

Ω

XTL

GND 0V

500

µA

5pF

460

Ω

750

µA

Figure 20

CPUMP L

CPUMP R

VCO Input

µA

Loop Filter Tracking

100

µA

100

µA

Dig Synth

Figure 21

DET L

DET R

Figure 22

PIN INTERNAL CIRCUITRY (continued)

I/O / 22kHz

The input is TTL compatible.

The output is tri-stateable.

SCL

This is the input to a Schmitt input buffer made with

a CMOS amplifier.

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.

Pull-down current for SDIP42.

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).

STV0056A

15/26

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