TDA7319 datasheet(4/16 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

GENERAL

eNO

Output Noise

All Gains 0dB (B = 20 to 20kHz flat)

µV

Total Tracking Error

AV = 0 to -24dB

AV = -24 to -47dB

S/N

Signal to Noise Ratio

All Gains = 0dB; VO =1Vrms

106

Channel Separation

100

Distortion

AV =0; Vin =1Vrms

0.01

0.08

BUS INPUTS

Vil

Input Low Voltage

Vih

Input High Voltage

Iin

Input Current

Vin = 0.4V

-5

µA

Output Voltage SDA

Acknowledge

IO = 1.6mA

0.4

0.8

Note 1: the device is functionally good at Vs = 5V. A step down, on VS, to 4V does’t reset the device.

APPLICATION SUGGESTIONS

The first and the last stages are volume control

blocks. The control range is 0 to -47dB (mute)

with a 1dB step.

The very high resolution allows the implementation

of systems free from any noisy acoustical effect.

The TDA7319 audioprocessor provides 3 bands

tones control.

Bass, Middle Stages

The Bass and the middle cells have the same

structure.

The Bass cell has an internal resistor Ri = 44K

Ω

typical.

The Middle cell has an internal resistor Ri = 25K

Ω

typical.

Several filter types can be implemented, connect-

ing external components to the Bass/Middle IN

and OUT pins.

The fig.1 refers to basic T Type Bandpass Filter

starting from the filter component values (R1 in-

ternal and R2,C1,C2 external) the centre fre-

quency Fc, the gain Av at max. boost and the fil-

ter Q factor are computed as follows:

⋅ π ⋅√

Ri, R2, C1, C2

AV =

R2 C2

+ R2 C1 + Ri C1

R2 C1

+ R2 C2

= √

Ri R2

+ C1 C2

R2 C1

+ R2 C2

Viceversa, once Fc, Av, and Ri internal value are

fixed, the external components values will be:

AV − 1

⋅ π ⋅ Ri ⋅ Q

⋅ C1

− 1Q2

− 1 − Q2

⋅ π ⋅ C1 ⋅ FC ⋅ (AV − 1) ⋅Q

Treble Stage

The treble stage is a high pass filter whose time

constant is fixed by an internal resistor (25K

Ω

typical) and an external capacitor connected be-

tween treble pins and ground

Typical responses are reported in Figg. 10 to 13.

CREF

The suggested 10

µF reference capacitor (CREF)

value can be reduced to 4.7

µF if the application

requires faster power ON.

Ri internal

OUT

D95AU313

Figure 1.

TDA7319

4/16

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