參數資料
型號： OPA830ID
英文描述： Low-Power, Single-Supply, Wideband Operational Amplifier
中文描述： 低功耗，單電源，寬帶運算放大器
文件頁數： 21/31頁
文件大?。?/td> 460K
代理商： OPA830ID
"#$
SBOS263B AUGUST 2004 REVISED JANUARY 2005
www.ti.com
21
OPA830
325
528
78.7
650
+5V
845
1.87k
V
O
22
μ
F
47
μ
F
75
Video DAC
75
Load
Figure 5. Video Line Driver with SAG Correction
The input is shifted slightly positive in Figure 5 using the
voltage divider from the positive supply. This gives about
a 200mV input DC offset that will show up at the output pin
as a 400mV DC offset when the DAC output is at zero
current during the sync tip portion of the video signal. This
acts to hold the output in its linear operating region. This
will pass on any power-supply noise to the output with a
gain of approximately 20dB, so good supply decoupling
is recommended on the power-supply pin. Figure 6 shows
the frequency response for the circuit of Figure 5. This plot
shows the 8Hz low-frequency high-pass pole and a
high-end cutoff at approximately 100MHz.
3
0
3
6
9
12
15
18
21
Frequency (Hz)
N
1
10
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
Figure 6. Video Line Driver Response to Matched
Load
NONINVERTING AMPLIFIER WITH REDUCED
PEAKING
Figure 7 shows a noninverting amplifier that reduces
peaking at low gains. The resistor R
C
compensates the
OPA830 to have higher Noise Gain (NG), which reduces
the AC response peaking (typically 5dB at G = +1 without
R
C
) without changing the DC gain. V
IN
needs to be a low
impedance source, such as an op amp. The resistor
values are low to reduce noise. Using both R
T
and R
F
helps minimize the impact of parasitic impedances.
OPA830
V
OUT
+5V
V
IN
R
G
R
T
R
F
R
C
Figure 7. Compensated Noninverting Amplifier
The Noise Gain can be calculated as follows:
G
1
1
R
F
R
G
G
2
1
R
T
RF
G1
R
C
NG
G
1
G
2
A unity-gain buffer can be designed by selecting
R
T
= R
F
= 20.0
and R
C
= 40.2
(do not use R
G
). This
gives a noise gain of 2, so the response will be similar to
the Characteristics Plots with G = +2. Decreasing R
C
to
20.0
will increase the noise gain to 3, which typically
gives a flat frequency response, but with less bandwidth.
The circuit in Figure 1 can be redesigned to have less
peaking by increasing the noise gain to 3. This is
accomplished by adding R
C
= 2.55k
across the op amp
inputs.
(1)
(2)
(3)
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相關代理商/技術參數
參數描述
OPA830ID 制造商:Texas Instruments 功能描述:IC OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC; Op Amp Type:Low Power; No. of Amplifiers:1; Slew Rate:500V/s; Supply Voltage Range: 1.4V to 5.5V; Amplifier Case Style:SOIC; No. of Pins:8; Bandwidth:250MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes
OPA830IDBV 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, Single-Supply, Wideband Operational Amplifier
OPA830IDBVR 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA830IDBVRG4 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA830IDBVT 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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