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參數資料
| 型號： | OPA820 |
| 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： | 14/25頁 |
| 文件大?。?/td> | 427K |
| 代理商： | OPA820 |
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SBOS303A JUNE 2004 REVISED JULY 2004
www.ti.com
14
WIDEBAND SINGLE-SUPPLY OPERATION
Figure 3 shows the AC-coupled, single +5V supply, gain of
+2V/V circuit configuration used as a basis for the +5V only
Electrical and Typical Characteristics. The key requirement for
single-supply operation is to maintain input and output signal
swings within the useable voltage ranges at both the input and
the output. The circuit of Figure 3 establishes an input
midpoint bias using a simple resistive divider from the +5V
supply (two 806
resistors) to the noninverting input. The
input signal is then AC-coupled into this midpoint voltage bias.
The input voltage can swing to within 0.9V of the negative
supply and 0.5V of the positive supply, giving a 3.6V
PP
input
signal range. The input impedance matching resistor (57.6
)
used in Figure 3 is adjusted to give a 50
input match when
the parallel combination of the biasing divider network is
included. The gain resistor (R
G
) is AC-coupled, giving the
circuit a DC gain of +1. This puts the input DC bias voltage
(2.5V) on the output as well. On a single +5V supply, the output
voltage can swing to within 1.3V of either supply pin while
delivering more than 80mA output current giving 2.4V output
swing into 100
(5.6dBm maximum at the matched load).
Figure 4 shows the AC-coupled, single +5V supply, gain of
1V/V circuit configuration used as a basis for the +5V only
Typical Characteristic curves. In this case, the midpoint DC
bias on the noninverting input is also decoupled with an
additional 0.01
μ
F decoupling capacitor. This reduces the
source impedance at higher frequencies for the noninverting
input bias current noise. This 2.5V bias on the noninverting
input pin appears on the inverting input pin and, since R
G
is DC
blocked by the input capacitor, will also appear at the output
pin.
The single-supply test circuits of Figure 3 and Figure 4 show
+5V operation. These same circuits can be used over a single-
supply range of +5V to +12V. Operating on a single +12V
supply, with the Absolute Maximum Supply voltage
specification of +13V, gives adequate design margin for the
typical
±
5% supply tolerance.
OPA820
+5V
+V
S
DIS
100
R
G
402
0.01
μ
F
806
806
57.6
+
6.8
μ
F
0.1
μ
F
0.01
μ
F
V
I
50
Source
R
F
402
V
O
V
S
/2
Figure 3. AC-Coupled, G = +2V/V, Single-Supply Specifications and Test Circuit
OPA820
+5V
+V
S
DIS
100
R
G
402
806
806
0.01
μ
F
0.01
μ
F
V
I
R
F
402
V
O
V
S
/2
+
6.8
μ
F
0.1
μ
F
Figure 4. AC-Coupled, G = 1V/V, Single-Supply Specifications and Test Circuit
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OPA820-HT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:UNITY-GAIN STABLE, LOW-NOISE, VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER |
| OPA820ID | 功能描述:高速運算放大器 Unity Gain Stable Lo Noise Vltg Feedback 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 |
| OPA820ID | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Texas Instruments 功能描述:IC, OP-AMP, 280MHZ, 240V/ us, SOIC-8 |
| OPA820IDBVR | 功能描述:高速運算放大器 Unity Gain Stable Lo Noise Vltg Feedback 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 |
| OPA820IDBVRG4 | 功能描述:高速運算放大器 Unity Gain Stable Lo Noise Vltg Feedback 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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