8051(RevD) 데이터 시트보기 (PDF) - Shengbang Microelectronics Co, Ltd

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8051
(Rev.:RevD)

250MHz, Rail-to-Rail Output CMOS Operational Amplifier

Shengbang Microelectronics Co, Ltd 

Typical Application Circuits

Differential Amplifier

The circuit shown in Figure 3 performs the difference function.

If the resistors ratios are equal ( R4 / R3 = R2 / R1 ), then

VOUT = ( Vp – Vn ) × R2 / R1 + Vref.

Driving Video

The SGM805x can be used in video applications like in Figure 5.

VIN

75Ω

SGM8051

R2

R1

Vn

Vp

R3

SGM8051

R4

Vref

VOUT

RF

RG

75Ω

CABLE

VOUT

75Ω

G = 1 + RF / RG

Figure 5. Typical Video Driving

Figure 3. Differential Amplifier

Low Pass Active Filter

The low pass filter shown in Figure 4 has a DC gain of (-R2/R1)

and the –3dB corner frequency is 1/2πR2C. Make sure the

filter is within the bandwidth of the amplifier. The Large values

of feedback resistors can couple with parasitic capacitance

and cause undesired effects such as ringing or oscillation in

high-speed amplifiers. Keep resistors value as low as

possible and consistent with output loading consideration.

R1

VIN

C

R2

SGM8051

VOUT

R3=R1//R2

Figure 4. Low Pass Active Filter

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SGM8051/2/3/4/5

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