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參數(shù)資料
| 型號(hào)： | LM359N |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Dual, High Speed, Programmable, Current Mode Norton Amplifiers |
| 中文描述： | DUAL OP-AMP, 30 MHz BAND WIDTH, PDIP14 |
| 封裝： | DIP-14 |
| 文件頁(yè)數(shù)： | 12/24頁(yè) |
| 文件大?。?/td> | 742K |
| 代理商： | LM359N |
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Application Hints
(Continued)
DESIGN EXAMPLE:
e
= 50 mV (MAX), f
= 10 MHz (MAX), desired circuit
BW = 20 MHz, A
V
= 20 dB, driving source impedance =
75
, V
+
= 12V.
1.
Basic circuit configuration:
2.
Select I
to provide adequate amplifier bandwidth so
that the closed loop bandwidth will be determined by R
f
and C
. To do this, the set current should program an
amplifier open loop gain of at least 20 dB at the desired
closed loop bandwidth of the circuit. For this example,
an I
of 0.5 mA will provide 26 dB of open loop gain at
20 MHz which will be sufficient. Using single resistor pro-
gramming for I
SET
:
3.
Since the closed loop bandwidth will be determined by
to obtain a 20 MHz bandwidth, both R
and C
should be kept
small. It can be assumed that C
can be in the range of 1 pF
to 5 pF for carefully constructed circuit boards to insure sta-
bility and allow a flat frequency response. This will limit the
value of R
f
to be within the range of:
Also, for a closed loop gain of +10, R
must be 10 times R
s
+ r
e
where r
e
is the mirror diode resistance.
4.
So as not to appreciably load the 75
input termination
resistance the value of (R
s
+ r
e
) is set to 750
.
5.
For A
v
= 10; R
f
is set to 7.5 k
.
6.
The optimum output DC level for symmetrical AC swing
is:
7.
The DC feedback current must be:
DC biasing predictability will be insured because 640 μA is
greater than the minimum of I
/5 or 100 μA.
For gain accuracy the total AC and DC mirror current should
be less than 2 mA. For this example the maximum AC mirror
current will be:
therefore the total mirror current range will be 574 μA to 706
μA which will insure gain accuracy.
8.
R
b
can now be found:
9.
Since R
+ r
will be 750
and r
e
is fixed by the DC mir-
ror current to be:
R
must be 750
–40
or 710
which can be a 680
resis-
tor in series with a 30
resistor which are standard 5% toler-
ance resistor values.
10. As a final design step, C
must be selected to pass the
lower passband frequency corner of 8 Hz for this ex-
ample.
A larger value may be used and a 0.01 μF ceramic capacitor
in parallel with C
i
will maintain high frequency gain accuracy.
DS007788-20
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM359N | 制造商:Texas Instruments 功能描述:IC AMP DUAL NORTON DIP14 359 |
| LM359N/B+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Voltage-Feedback Operational Amplifier |
| LM359N/NOPB | 功能描述:IC AMP DUAL PROG CUR MODE 14-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| LM35A | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Precision Centigrade Temperature Sensors |
| LM35AH | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線(xiàn)接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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