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參數(shù)資料
| 型號： | THAT2150A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | IC Voltage-Controlled Amplifiers |
| 中文描述： | IC電壓控制的放大器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 144K |
| 代理商： | THAT2150A |
Applications
Input
As mentioned above, input and output signals are
currents, not voltages. While this often causes some
conceptual difficulty for designers first exposed to this
convention, the current input/ output mode provides
great flexibility in application.
The input pin (pin 1) is a virtual ground with nega-
tive feedback provided internally (see Figure 6, Page 4).
The input resistor (shown as 20 k
in Figure 3, Page 3)
should be scaled to convert the available ac input volt-
age to a current within the linear range of the device.
(Peak input currents should be kept under 1 mA for
best distortion performance.) An additional consider-
ation is stability: the internal op amp is intended for
operation with source impedances of less than 30 k
at high frequencies. For most audio applications, this
will present no problem.
The choice of input resistor has an additional, sub-
tle effect on distortion. Since the feedback impedances
around the internal opamp (essentially Q1/ D1 and
Q3/ D3) are fixed, low values for the input resistor will
require more closed-loop gain from the opamp. Since
the open-loop gain naturally falls off at high frequen-
cies, asking for too much gain will lead to increased
high-frequency distortion. For best results, this resis-
tor should be kept to 10 k
or above. Distortion vs. fre-
quency for a 1 V signal at 0 dB gain with a 20 k
input
resistor is plotted in Figure 13.
The quiescent dc voltage level at the input is ap-
proximately +10 mV. As mentioned above, any dc input
currents will cause dc signals in the output which will
be modulated by gain, causing audible thump. There-
Figure 10. 1kHz THD+Noise Vs. Input, -15 dB Gain
Figure 11. 1kHz THD+Noise Vs. Level, 0 dB Gain
Figure 12. 1kHz THD+Noise Vs. Input, +15 dB Gain
Figure 13. THD Vs. Frequency, 0 dB Gain
THAT Corporation; 734 Forest Street; Marlborough, Massachusetts 01752; USA
Tel: (508) 229-2500; Fax: (508) 229-2590; Web: http:/ / www.thatcorp.com
Rev. 10/ 25/ 96
Page 7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THAT2151 | IC Voltage-Controlled Amplifiers |
| THAT2155 | IC Voltage-Controlled Amplifiers |
| THAT2181 | Trimmable IC Voltage Controlled Amplifiers |
| THAT2181A | Trimmable IC Voltage Controlled Amplifiers |
| THAT2181B | Trimmable IC Voltage Controlled Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THAT2151 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC Voltage-Controlled Amplifiers |
| THAT2155 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC Voltage-Controlled Amplifiers |
| THAT2180A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pre-Trimmed IC Voltage Controlled Amplifiers |
| THAT2180AL08-U | 制造商:THAT CORPORATION 功能描述:AMP VOLT CONTROLLED PRETRIM 2180 制造商:THAT CORPORATION 功能描述:AMP, VOLT CONTROLLED, PRETRIM, 2180 制造商:THAT CORPORATION 功能描述:AMP, VOLT CONTROLLED, PRETRIM, 2180; IC Function:Voltage Controlled Amplifier; Brief Features:Exponential Gain Control, Wide Gain Range; Supply Voltage Min:-18V; Supply Voltage Max:18V; Operating Temperature Min:0C; Operating ;RoHS Compliant: Yes |
| THAT2180B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pre-Trimmed IC Voltage Controlled Amplifiers |
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