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參數(shù)資料
| 型號(hào)： | HFA1130IB96 |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC BUFFER CFA 850MHZ 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 2300 V/µs |
| -3db帶寬： | 850MHz |
| 電流 - 輸入偏壓： | 25µA |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 21mA |
| 電流 - 輸出 / 通道： | 60mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
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4
FN3369.5
April 25, 2013
Application Information
Optimum Feedback Resistor (RF)
The enclosed plots of inverting and non-inverting frequency
response detail the performance of the HFA1130 in various
gains. Although the bandwidth dependency on ACL isn’t as
severe as that of a voltage feedback amplifier, there is an
appreciable decrease in bandwidth at higher gains. This
decrease can be minimized by taking advantage of the current
feedback amplifier’s unique relationship between bandwidth
and RF. All current feedback amplifiers require a feedback
resistor, even for unity gain applications, and the RF, in
conjunction with the internal compensation capacitor, sets the
dominant pole of the frequency response. Thus, the
amplifier’s bandwidth is inversely proportional to RF. The
HFA1130 design is optimized for a 510
Ω R
F, at a gain of +1.
Decreasing RF in a unity gain application decreases stability,
resulting in excessive peaking and overshoot (Note:
Capacitive feedback causes the same problems due to the
feedback impedance decrease at higher frequencies). At
higher gains the amplifier is more stable, so RF can be
decreased in a trade-off of stability for bandwidth. The table
below lists recommended RF values for various gains, and the
expected bandwidth.
Clamp Operation
General
The HFA1130 features user programmable output clamps to
limit output voltage excursions. Clamping action is obtained
by applying voltages to the VH and VL terminals (pins 8 and
5) of the amplifier. VH sets the upper output limit, while VL
sets the lower clamp level. If the amplifier tries to drive the
output above VH, or below VL, the clamp circuitry limits the
output voltage at VH or VL (± the clamp accuracy),
respectively. The low input bias currents of the clamp pins
allow them to be driven by simple resistive divider circuits, or
active elements such as amplifiers or DACs.
Clamp Circuitry
Figure 1 shows a simplified schematic of the HFA1130 input
stage, and the high clamp (VH) circuitry. As with all current
feedback amplifiers, there is a unity gain buffer (QX1 - QX2)
between the positive and negative inputs. This buffer forces -IN
to track +IN, and sets up a slewing current of (V-IN -VOUT)/RF.
This current is mirrored onto the high impedance node (Z) by
QX3-QX4, where it is converted to a voltage and fed to the output
via another unity gain buffer. If no clamping is utilized, the high
impedance node may swing within the limits defined by QP4 and
QN4. Note that when the output reaches it’s quiescent value, the
current flowing through -IN is reduced to only that small current
(-IBIAS) required to keep the output at the final voltage.
Overdrive Recovery Time
VIN = ±1V
B
+25
-
0.75
1.5
ns
Negative Clamp Range
B
+25
-
-5.0 to +2.0
-
V
Positive Clamp Range
B
+25
-
-2.0 to +5.0
-
V
Clamp Input Bias Current
A
+25
-
50
200
A
Clamp Input Bandwidth
VH or VL = 100mVP-P
B
+25
-
500
-
MHz
NOTES:
2. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.
3. See Typical Performance Curves for more information.
Electrical Specifications
VSUPPLY = ±5V, AV = +1, RF = 510Ω, RL = 100Ω, Unless Otherwise Specified (Continued)
PARAMETER
TEST
CONDITIONS
TEST
LEVEL
(Note 2)
TEMP.
(°C)
MIN
TYP
MAX
UNITS
ACL
RF (Ω)BW (MHz)
+1
510
850
-1
430
580
+2
360
670
+5
150
520
+10
180
240
+19
270
125
+1
+IN
V-
V+
QP1
QN1
V-
QN3
QP3
QP4
QN2
QP2
QN4
QP5
QN5
Z
V+
-IN
VOUT
ICLAMP
RF
(EXTERNAL)
QP6
QN6
VH
R1
50K
(30K
FOR VL)
200
Ω
FIGURE 1. HFA1130 SIMPLIFIED VH CLAMP CIRCUITRY
HFA1130
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFA1130IBZ | 功能描述:運(yùn)算放大器 - 運(yùn)放 W/ANL OPAMP 850MHZ CFB CLMP IND RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| HFA1130IBZ | 制造商:Intersil Corporation 功能描述:Operational Amplifier (Op-Amp) IC |
| HFA1130IBZ-T | 功能描述:運(yùn)算放大器 - 運(yùn)放 W/ANL OPAMP 850MHZ CFB CLMP IND RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| HFA1130IJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HFA1130IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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