RB-TA3020-2 参数 Datasheet PDF下载

Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on

ARCHITECTURE

A block diagram of one channel of the reference board is shown in Figure 4. The major functional blocks

of the amplifier are described below.

In

Input Stage

TA3020

Output

Section

Out

Figure 4

Note: The TA3020 is an inverting amplifier.

TA3020 Amplifier Gain

The TA3020 amplifier gain is the product of the input stage gain and the modulator gain.

A

VTA3020

= A

VINPUTSTAGE

* A

VMODULATOR

A

VTA3020

≈ −

R

F



R

FBC

∗

(

R

FBA

+

R

FBB

)



×

+

1





R

I



R

FBA

∗

R

FBB



For the RB-TA3020-2 board;

R

I

(R100, R200) = 49.9kΩ

R

F

(R101, R201) = 20kΩ

R

FBA

(R105, R205) = 1kΩ

R

FBB

(R110, R210) = 1.07kΩ

R

FBC

(R106, R206) = 13.3k

Ω

A

VTA3020

≈ −

20k

Ω 

13.3k

Ω

∗

(

1k

Ω

+

1.07k

Ω

)



×

+

1

 =

10.71 V V



49.9k

Ω 

1k

Ω ∗

1.07k

Ω



Input Stage

Figure 5 shows one channel of the Input Stage. The TA3020 amplifier is designed to accept unbalanced

inputs. For the RB-TA3020-1, the gain is 6.4, or approximately 16 dB. For the RB-TA3020-2, the gain is

10.8, or approximately 20.7 dB. Please note that the input stage of the TA3020 is biased at

approximately 2.5VDC. Therefore, for an input signal centered around ground (0VDC), the polarity of the

coupling capacitor, C

IN

, shown in Figure 5 is correct.

5

RB-TA3020, Rev. 3.0/03.02