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參數(shù)資料
| 型號： | OPA860 |
| 元件分類： | 跨導(dǎo)放大器 |
| 英文描述： | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| 中文描述： | 寬帶運算跨導(dǎo)放大器（OTA）和緩沖區(qū) |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 613K |
| 代理商： | OPA860 |
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BASIC CONNECTIONS
Figure 46
shows basic connections required for
operation. These connections are not shown in sub-
sequent circuit diagrams. Power-supply bypass ca-
pacitors should be located as close as possible to the
device pins. Solid tantalum capacitors are generally
best.
QUIESCENT CURRENT CONTROL PIN
The
quiescent
current
portion of the OPA860 is set with a resistor, R
ADJ
,
connected from pin 1 to –V
S
. It affects only the
operating currents of OTA sections. The bias circuitry
of the Buffer section is independent of the bias
circuitry for the OTA section; therefore, the quiescent
current cannot go below 5.8mA. The maximum
quiescent current is 12.7mA. R
ADJ
should be set
between 50
and 1k
for optimal performance of the
OTA section. This range corresponds to the 12.5mA
quiescent current for R
ADJ
= 50
, and 9mA for R
ADJ
=
1k
. If the I
Q
adjust pin is connected to the negative
supply, the quiescent current will be set by the 250
internal resistor.
R
1
1.25k
TLV2262
OPA860
1/2 REF200
100
μ
A
R
2
425
V+
I
Q
Adjust
1 I
1
OPA860
SBOS331–JUNE 2005
It is also possible to vary the quiescent current with a
control signal. The control loop in
Figure 45
shows
1/2 of a REF200 current source used to develop
100mV on R
1
. The loop forces 125mV to appear on
R
2
. Total quiescent current of the OPA860 is approxi-
mately 37
×
I
1
, where I
1
is the current made to flow
out of pin 1.
of
the
transconductance
Figure 45. Optional Control Loop for Setting
Quiescent Current
Reducing or increasing the quiescent current for the
OTA section controls the bandwidth and AC behavior
as well as the transconductance. With R
ADJ
= 250
,
this sets approximately 11.2mA total quiescent cur-
rent at 25
°
C. It may be appropriate in some appli-
cations to trim this resistor to achieve the desired
quiescent current or AC performance.
Applications circuits generally do not show the
resistor R
Q
, but it is required for proper operation.
With a fixed R
ADJ
resistor, quiescent current in-
creases with temperature (see Figure 43 in the
Typical Characteristics
section). This variation of
current with temperature holds the transconductance,
g
, of the OTA relatively constant with temperature
(another advantage over a transistor).
14
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PDF描述 |
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| OPA860ID | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| OPA860IDR | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| OPB610 | Photo Gap Detector |
| OPB621 | |
| OPB665N | 1024K, 128K X 8, 2.5V SERIAL EEPROM, -40C to +85C, 8-PDIP, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA860ID | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Transconductance RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860ID | 制造商:Texas Instruments 功能描述:TRANSCONDUCTANCE OP-AMP W/BUFFER ((NS)) |
| OPA860IDG4 | 功能描述:跨導(dǎo)放大器 Wide BW Op Transcon Amp and Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860IDR | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Transconductance RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860IDRG4 | 功能描述:跨導(dǎo)放大器 Wide BW Op Transcon Amp and Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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