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| 型號： | OPA2674IDR |
| 英文描述： | Dual Wideband, High Output Current Operational Amplifier with Current Limit |
| 中文描述： | 雙寬帶，高輸出電流運算放大器，具有電流限制 |
| 文件頁數(shù)： | 24/30頁 |
| 文件大?。?/td> | 472K |
| 代理商： | OPA2674IDR |
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SBOS270 AUGUST 2003
www.ti.com
24
R
G
R
F
R
S
E
O2
Driver
E
RS
E
N
I
N
I
I
√4
kTR
S
√
4kTR
F
R
F
R
S
E
RS
E
N
I
I
I
N
√4
kTR
S
√
4kTR
G
√
4kTR
F
Figure 14. Differential Op Amp Noise Analysis
Model
As a reminder, the differential gain is expressed as:
G
D
1
2
R
F
R
G
The output noise voltage can be expressed as shown below:
eO
2
2
GD
2
eN2
iN
RS
2
4kTRS
2 iIRF
2
2 4kTRFGD
Dividing this expression by the differential noise gain
G
D
= (1 + 2R
F
/R
G
) gives the equivalent input referred
spot noise voltage at the noninverting input, as shown in
Equation 21.
e
N
2
e
N2
i
N
R
S
2
4kTR
S
2 i
I
R
F
G
D
2
2
4kTR
F
G
D
Evaluating this equation for the OPA2674 circuit and
component values of Figure 5 gives a total output spot
noise voltage of 31.0nV/
√
Hz and a total equivalent input
spot noise voltage of 3.5nV/
√
Hz.
In order to minimize the noise contributed by I
N
, it is
recommended to keep the noninverting source impedance
as low as possible.
DC ACCURACY AND OFFSET CONTROL
A current-feedback op amp such as the OPA2674
provides exceptional bandwidth in high gains, giving fast
pulse settling but only moderate DC accuracy. The
Electrical Characteristics show an input offset voltage
comparable to high-speed, voltage-feedback amplifiers;
however, the two input bias currents are somewhat higher
and are unmatched. While bias current cancellation
techniques are very effective with most voltage-feedback
op amps, they do not generally reduce the output DC offset
for wideband current-feedback op amps. Because the two
input bias currents are unrelated in both magnitude and
polarity, matching the input source impedance to reduce
error contribution to the output is ineffective. Evaluating
the configuration of Figure 1, using worst-case +25
°
C
input offset voltage and the two input bias currents, gives
a worst-case output offset range equal to:
V
OS
=
±
(NG
×
V
IO(MAX)
)
±
(I
BN
×
R
S
/2
×
NG)
±
(I
BI
×
R
F
)
where NG = noninverting signal gain
=
±
(4
×
4.5mV)
±
(30
μ
A
×
25
×
4)
±
(402
×
35
μ
A)
=
±
18mV
±
3mV
±
14mV
V
OS
=
±
35.0mV (max at 25
°
C)
POWER CONTROL OPERATION (SO-14 ONLY)
The OPA2674I-14D provides a power control feature that
may be used to reduce system power. The four modes of
operation for this power control feature are full-power,
power cutback, idle state, and power shutdown. These
four operating modes are set through two logic lines A0
and A1. Table 3 shows the different modes of operation.
Table 3. Power Control Mode of Operation
MODE OF
OPERATION
A1
A0
Full
-
Power
1
1
Power Cutback
1
0
Idle State
0
1
Shutdown
0
0
The full-power mode is used for normal operating
condition. The power cutback mode brings the quiescent
power to 13.5mA. The idle state mode keeps a low output
impedance but reduces output power and bandwidth. The
shutdown mode has a high output impedance as well as
the lowest quiescent power (1.0mA).
If the A0 and A1 pins are left unconnected, the
OPA2674I-14D operates normally (full-power).
(19)
(20)
(21)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2674IDRG4 | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| OPA2677E/250 | 制造商:Texas Instruments 功能描述: |
| OPA2677H | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| OPA2677H | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| OPA2677H/2K5 | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)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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