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參數資料
| 型號： | OPA683IDBVT |
| 元件分類： | 運動控制電子 |
| 英文描述： | OP-AMP|SINGLE|BIPOLAR|TSOP|6PIN|PLASTIC |
| 中文描述： | 運放|單|雙極|的TSOP | 6針|塑料 |
| 文件頁數： | 15/24頁 |
| 文件大小： | 400K |
| 代理商： | OPA683IDBVT |
OPA683
SBOS221B
15
www.ti.com
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Two PC boards are available to assist in the initial evaluation
of circuit performance using the OPA683 in its two package
styles. Both of these are available free as an unpopulated PC
board delivered with descriptive documentation. The sum-
mary information for these boards is shown in Table I.
The buffer gain is typically very close to 1.00 and is normally
neglected from signal gain considerations. It will, however
set the CMRR for a single op amp differential amplifier
configuration. For the buffer gain
α
< 1.0, the CMRR =
–
20
log(1
–
α
). The closed loop input stage buffer used in
the OPA683 gives a buffer gain more closely approaching
1.00 and this shows up in a slightly higher CMRR than any
previous current feedback op amp. The 60dB typical CMRR
shown in the Electrical Characteristics implies a buffer gain
of 0.9990.
R
I
, the buffer output impedance, is a critical portion of the
bandwidth control equation. The OPA683 reduces this ele-
ment to approximately 4.5
using the loop-gain of the input
buffer stage. This significant reduction in buffer output im-
pedance, on very low power, contributes significantly to
extending the bandwidth at higher gains.
BOARD
PART
NUMBER
LITERATURE
REQUEST
NUMBER
PRODUCT
PACKAGE
OPA683ID
OPA683IDBQ
SO-8
SOT23-6
DEM-OPA68xU
DEM-OPA6xxN
SBOU009
SBOU010
TABLE I. EVM Boards by Package.
OPERATING SUGGESTIONS
SETTING RESISTOR VALUES TO OPTIMIZE
BANDWIDTH
Any current-feedback op amp like the OPA683 can hold high
bandwidth over signal gain settings with the proper adjust-
ment of the external resistor values. A low-power part like the
OPA683 typically shows a larger change in bandwidth due to
the significant contribution of the inverting input impedance
to loop-gain changes as the signal gain is changed. Figure
10 shows a simplified analysis circuit for any current feed-
back amplifier.
The key elements of this current feedback op amp model are:
α
Buffer gain from the noninverting input to the inverting input
R
I
Buffer output impedance
i
ERR
Feedback error current signal
Z(s)
Frequency dependent open loop transimpedance gain
from i
ERR
to V
O
OPA683
+5V
DIS
60
R
G
R
G
R
I
1.4k
50
22pF
V
I
V
O
1.4k
0.1
μ
F
V
O
=
–
V
I
IN
IN
CM
ADS830
10-Bit
20MSPS
2.5V
DC
+2.5V
2Vp-p
Max
FIGURE 9. Low Power, Single-Supply, ADC Driver.
R
F
V
O
R
G
R
I
Z
(S)
i
ERR
i
ERR
α
V
I
FIGURE 10. Current Feedback Transfer Function Analysis
Circuit.
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| OPA683IDR | OP-AMP|SINGLE|BIPOLAR|SOP|8PIN|PLASTIC |
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| OPA685N | Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM |
| OPA685U | Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OPA683IDBVTG4 | 功能描述:高速運算放大器 Very Lo-Pwr Current 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 |
| OPA683IDG4 | 功能描述:高速運算放大器 Very Lo-Pwr Current 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 |
| OPA683IDR | 功能描述:高速運算放大器 Very Lo-Pwr Current 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 |
| OPA683IDRG4 | 功能描述:高速運算放大器 Very Lo-Pwr Current 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 |
| OPA684 | 制造商:BB 制造商全稱:BB 功能描述:Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
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