SI3014 查看數據表（PDF） - Silicon Laboratories

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SI3014

GLOBAL MC’97 SILICON DAA

Silicon Laboratories 

Si3038

Analog Output

Figure 20 illustrates an optional application circuit to support the analog output capability of the Si3038 for call

progress monitoring purposes. The AOUT level can be set to 0 dB, –6 dB, –12 dB, and mute for both transmit and

receive paths through the ATM/ARM bits in register 5Ch. U1 provides a gain of 26 dB. Additional gain adjustments

may be made by varying the voltage divider created by R1 and R3.

AOUT

C2

R3

C1

C6

R1

+5 V

36

+

5

2–

4 U1

C4

+

C5

C3

R2

Speaker

Figure 20. Optional Connection to AOUT for a Call Progress Speaker

‘

Table 18. Component Values—Optional Connection to AOUT

Symbol

Value

C1

2200 pF, 16 V, ±20%

C2, C3, C5

0.1 µF, 16 V, ±20%

C4

100 µF, 16 V, Elec. ±20%

C6

820 pF, 16 V, ±20%

R1

10 kΩ, 1/10 W, ±5%

R2

10 Ω, 1/10 W, ±5%

R3

47 kΩ, 1/10 W, ±5%

U1

LM386

Rev. 2.01

19

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