- 您現(xiàn)在的位置：買賣IC網 > PDF目錄384440 > HS7-1145RH-Q (INTERSIL CORP) CONNECTOR ACCESSORY PDF資料下載
參數(shù)資料
| 型號： | HS7-1145RH-Q |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| 封裝： | CERDIP-8 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 145K |
| 代理商： | HS7-1145RH-Q |
2
Application Information
Optimum Feedback Resistor
Although a current feedback amplifier’s bandwidth
dependency on closed loop gain isn’t as severe as that of a
voltage feedback amplifier, there can be an appreciable
decrease in bandwidth at higher gains. This decrease may
be minimized by taking advantage of the current feedback
amplifier’s unique relationship between bandwidth and R
F
.
All current feedback amplifiers require a feedback resistor,
even for unity gain applications, and R
F
, in conjunction with
the internal compensation capacitor, sets the dominant pole
of the frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to R
F
. The HS-1145RH design is
optimized for R
F
= 510
at a gain of +2. Decreasing R
F
decreases stability, resulting in excessive peaking and
overshoot (Note: Capacitive feedback will cause the same
problems due to the feedback impedance decrease at higher
frequencies). At higher gains, however, the amplifier is more
stable so R
F
can be decreased in a trade-off of stability for
bandwidth.
The table below lists recommended R
F
values for various
gains, and the expected bandwidth. For a gain of +1, a
resistor (
+
R
S
) in series with +IN is required to reduce gain
peaking and increase stability.
Non-Inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be
≥
50
.
This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
DISABLE Input TTL Compatibility
The HS-1145RH derives an internal GND reference for the
digital circuitry as long as the power supplies are symmetrical
about GND. With symmetrical supplies the digital switching
threshold (V
TH
= (V
IH
+ V
IL
)/2 = (2.0 + 0.8)/2) is 1.4V, which
ensures the TTL compatibility of the DISABLE input. If
asymmetrical supplies (e.g., +10V, 0V) are utilized, the
switching threshold becomes:
and the V
IH
and V
IL
levels will be V
TH
±
0.6V, respectively.
Optional GND Pad (Die Use Only) for TTL
Compatibility
The die version of the HS-1145RH provides the user with a
GND pad for setting the disable circuitry GND reference.
With symmetrical supplies the GND pad may be left
unconnected, or tied directly to GND. If asymmetrical
supplies (e.g., +10V, 0V) are utilized, and TTL compatibility
is desired, die users must connect the GND pad to GND.
With an external GND, the DISABLE input is TTL compatible
regardless of supply voltage utilized.
Pulse Undershoot and Asymmetrical Slew Rates
The HS-1145RH utilizes a quasi-complementary output
stage to achieve high output current while minimizing
quiescent supply current. In this approach, a composite
device replaces the traditional PNP pulldown transistor. The
composite device switches modes after crossing 0V,
resulting in added distortion for signals swinging below
ground, and an increased undershoot on the negative
portion of the output waveform (See Figures 5, 8, and 11).
This undershoot isn’t present for small bipolar signals, or
large positive signals. Another artifact of the composite
device is asymmetrical slew rates for output signals with a
negative voltage component. The slew rate degrades as the
output signal crosses through 0V (See Figures 5, 8, and 11),
resulting in a slower overall negative slew rate. Positive only
signals have symmetrical slew rates as illustrated in the
large signal positive pulse response graphs (See Figures 4,
7, and 10).
PC Board Layout
This amplifier’s frequency response depends greatly on the
care taken in designing the PC board.
The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
device’s input and output connections. Capacitance,
parasitic or planned, connected to the output must be
minimized, or isolated as discussed in the next section.
Care must also be taken to minimize the capacitance to
ground at the amplifier’s inverting input (-IN), as this
capacitance causes gain peaking, pulse overshoot, and if
large enough, instability. To reduce this capacitance, the
designer should remove the ground plane under traces
connected to -IN, and keep connections to -IN as short as
possible.
An example of a good high frequency layout is the
Evaluation Board shown in Figure 2.
GAIN
(A
CL
)
R
F
(
)
BANDWIDTH
(MHz)
-1
425
300
+1
510 (+R
S
= 510
)
270
+2
510
330
+5
200
300
+10
180
130
V
TH
---------+
2
1.4V
+
=
HS-1145RH
相關PDF資料 |
PDF描述 |
|---|---|
| HS7B-1145RH-Q | Radiation Hardened, High Speed, Low Power, Current Feedback Video Operational Amplifier with Output Disable |
| HS-117RH | Adjustable Positive Voltage Regulator(可調正輸出穩(wěn)壓器) |
| HS-1410RH | Radiation Hardened, High Speed, Low Power, Current Feedback Op Amp with Output Disable(抗輻射高速、低功耗電流反饋放大器（輸出禁止）) |
| HS9-1410RH-Q | Radiation Hardened, High Speed, Low Power, Current Feedback Op Amp with Output Disable |
| HS-1840RH883S | Rad-Hard 16 Channel CMOS Analog Multiplexer with High-Z Analog Input Protection |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HS7-1212RH-Q | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Radiation Hardened, Dual, High Speed Low Power, Video Closed Loop Buffer |
| HS7144ECH61H | 功能描述:DEV EMULATOR PCB ADAPTOR FP-112B RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標準包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關產品:1-Wire? 設備 產品目錄頁面:1429 (CN2011-ZH PDF) |
| HS7144KCI01H | 功能描述:ON CHIP DEBUG EMULATOR RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 內電路編程器、仿真器以及調試器 系列:- 產品變化通告:Development Systems Discontinuation 19/Jul/2010 標準包裝:1 系列:* 類型:* 適用于相關產品:* 所含物品:* |
| HS7144KCI02H | 功能描述:ON CHIP DEBUG EMULATOR W/TRACE RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 內電路編程器、仿真器以及調試器 系列:- 產品變化通告:Development Systems Discontinuation 19/Jul/2010 標準包裝:1 系列:* 類型:* 適用于相關產品:* 所含物品:* |
| HS7145ECH61H | 功能描述:DEV EMULATOR PCB ADAPTOR FP-144F RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標準包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關產品:1-Wire? 設備 產品目錄頁面:1429 (CN2011-ZH PDF) |
發(fā)布緊急采購，3分鐘左右您將得到回復。