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參數(shù)資料
| 型號： | OPA699ID |
| 元件分類： | 運動控制電子 |
| 英文描述： | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| 中文描述： | 寬帶，高增益電壓限幅放大器 |
| 文件頁數(shù)： | 19/25頁 |
| 文件大?。?/td> | 461K |
| 代理商： | OPA699ID |
OPA699
SBOS261B
19
www.ti.com
The circuit operates as follows. When the input voltage is
less than V
HL
then the output is limiting at V
H
. When the input
is greater than V
HH
, then the output is limiting at V
L
, with V
HL
and V
HH
defined as the following:
V
R
R
R
R
V
R
R
R
R
V
HL HH
,
REF
OUT
||
||
||
||
=
×
+
×
1
2
3
1
1
2
3
2
Due to the inverting function realized by the Schmitt Trigger,
V
HL
corresponds to V
OUT
= V
H
, and V
HH
corresponds to
V
OUT
= V
L
.
Figure 11 shows the Schmitt Trigger operating with V
REF
=
+5V. This gives us V
HH
= 2.4V and V
HL
= 1.6V. The propa-
gation delay for the OPA699 in a Schmitt Trigger configura-
tion is 4ns from high-to-low, and 4ns from low-to-high.
OPERATING SUGGESTIONS
THEORY OF OPERATION
The OPA699 is a voltage-feedback, gain of +4V/V stable op
amp. The output voltage is limited to a range set by the
voltage on the limiter pins (5 and 8). When the input tries to
overdrive the output, the limiters take control of the output
buffer. This action from the limiters avoids saturating any part
of the signal path, giving quick overdrive recovery and
excellent limiter accuracy at any signal gain. The limiters
have a very sharp transition from the linear region of opera-
tion to output limiting. This transition allows the limiter volt-
ages to be set very near (< 100mV) the desired signal range.
The distortion performance is also very good near the limiter
voltages.
OUTPUT LIMITERS
The output voltage is linearly dependent on the input(s) when
it is between the limiter voltages V
H
(pin 8) and V
L
(pin 5).
When the output tries to exceed V
H
or V
L
, the corresponding
limiter buffer takes control of the output voltage and holds it
at V
H
or V
L
. Because the limiters act on the output, their
accuracy does not change with the gain. The transition from
the linear region of operation to output limiting is very
sharp
—
the desired output signal can safely come to within
30mV of V
H
or V
L
with no onset of non-linearity. The limiter
voltages can be set to within 0.7V of the supplies (V
L
≥
–
V
S
+ 0.7V, V
H
≤
+V
S
–
0.7V). They must also be at least 400mV
apart (V
H
–
V
L
≥
0.4V). When pins 5 and 8 are left open, V
H
and V
L
go to the default voltage limit; the minimum values are
given in the electrical specifications. Looking at Figure 12 for
the zero bias current case shows the expected range of
(V
S
–
default limit voltages) = headroom.
DESIGN-IN TOOLS
APPLICATIONS SUPPORT
The Texas Instruments Applications Department is available
for design assistance at 1-972-644-5580. The Texas Instru-
ments web site (www.ti.com) has the latest product data
sheets and other design tools.
DEMONSTRATION BOARDS
A PC board is available to assist in the initial evaluation of
circuit performance of the OPA699ID. It is available as an
unpopulated PCB with descriptive documentation, and can
be requested through the TI web site. See the demonstration
board literature for more information. The summary informa-
tion for this board is shown in Table I.
Time (10ns/div)
I
4
3
2
1
0
–
1
–
2
–
3
–
4
V
IN
V
OUT
L
μ
A
Limiter Headroom (V)
0
1.0
0.5
4.0
4.5
3.5
3.0
2.5
2.0
1.5
5.0
100
75
50
25
0
–
25
–
50
–
75
–
100
Maximum Over Temperature
Minimum Over Temperature
Limiter Headroom = +V
S
–
V
H
= V
L
–
(
–
V
S
)
Current = I
VH
or
–
I
VL
FIGURE 11. Schmitt Trigger Time Domain Response for a
10MHz Sinewave.
BOARD
PART NO.
LITERATURE
REQUEST NO.
PRODUCT
PACKAGE
OPA699ID
SO-8
DEM-OPA68xU
SBOU009
TABLE I. Demo Board Summary Information.
FIGURE 12. Limiter Bias Current vs Bias Voltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA699ID | 制造商:Texas Instruments 功能描述:IC, LIMITING AMPLIFIER, 260MHZ, SOIC-8 |
| OPA699IDG4 | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting 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(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699IDR | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting 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(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699IDRG4 | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting 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(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:GAIN 4 STABLE WIDEBAND VOLTAGE LIMITING AMPLIFIER |
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