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The '''M377''' is a Tek-made amplifier integrated circuit designed by [[John Addis]].   
The '''M377''' is a Tek-made amplifier integrated circuit designed by [[John Addis]].   
Its initial use was in the following plug-ins:
Its initial use was in the [[11A16]], [[11A32]], [[11A33]], [[11A34]] and [[11A52]] plug-ins.
* [[11A16]]
* [[11A32]]
* [[11A33]]
* [[11A34]]
* [[11A52]]


Later, it was also used in the following oscilloscopes:
Later, it was also used in the following oscilloscopes:
* [[TDS410|TDS 410]]
* [[TDS410|TDS 410]] / [[TDS420|TDS 420]] /[[TDS460|TDS 460]]
* [[TDS420|TDS 420]]
* [[TDS520|TDS 520D]] / [[TDS540|TDS 540D]] / [[TDS580|TDS 580D]]
* [[TDS460|TDS 460]]
* [[TDS680|TDS 680C]] / [[TDS684|TDS 684C]]
* [[TDS520|TDS 520D]]
* [[TDS714|TDS 714L]] / [[TDS724|TDS 724D]] / [[TDS754|TDS 754D]] / [[TDS784|TDS 784D]]
* [[TDS540|TDS 540D]]
* [[TDS580|TDS 580D]]
* [[TDS680|TDS 680C]]
* [[TDS684|TDS 684C]]
* [[TDS714|TDS 714L]]
* [[TDS724|TDS 724D]]
* [[TDS754|TDS 754D]]
* [[TDS784|TDS 784D]].


About the M377, John Addis says:
About the M377, [[John Addis]] says:
<blockquote>
<blockquote>
<p>The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages,  
<p>The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages,  
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! Components on ceramic hybrid
! Components on ceramic hybrid
|-
|-
|11A32 || B010100 - B031028 || 165-2089-03 || 100 ohms || M377 chip only
|11A32 || B010100 - B031028 || 165-2089-03 || 100 Ω || M377 chip only
|-
|-
|11A32 || B031029 - up || 165-2089-05 || 100 ohms || M377 chip only
|11A32 || B031029 - up || 165-2089-05 || 100 Ω || M377 chip only
|-
|-
|11A34 || B010100 - B031044 || 165-2089-04 || 200 ohms || M377 chip only
|11A34 || B010100 - B031044 || 165-2089-04 || 200 Ω || M377 chip only
|-
|-
|11A34 || B031045 - up || 165-2089-06 || 200 ohms || M377 chip only
|11A34 || B031045 - up || 165-2089-06 || 200 Ω || M377 chip only
|-
|-
|11A52 || B010100 - B010179 || 165-2129-02 || 100 ohms || Diode bridge + 50 ohm input R + M377 chip
|11A52 || B010100 - B010179 || 165-2129-02 || 100 Ω || Diode bridge + 50 Ω input R + M377 chip
|-
|-
|11A52 || B010180 - up || 165-2129-03 || 100 ohms || Diode bridge + 50 ohm input R + M377 chip
|11A52 || B010180 - up || 165-2129-03 || 100 Ω || Diode bridge + 50 Ω input R + M377 chip
|-
|-
|}
|}
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Output 1 of U310 is in parallel with output 3 of U410.
Output 1 of U310 is in parallel with output 3 of U410.
Output 3 of U310 is in parallel with output 1 of U410.
Output 3 of U310 is in parallel with output 1 of U410.


Note that in the 11A32 and 11A34, the HF ADJUST control voltages are not set identically for the three outputs.
Note that in the 11A32 and 11A34, the HF ADJUST control voltages are not set identically for the three outputs.
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|-  
|-  
|- bgcolor="Pink"  
|- bgcolor="Pink"  
|  3 || +15V ||
|  3 || +15 V ||
|-  
|-  
|- bgcolor="Yellow"
|- bgcolor="Yellow"
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|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
|  6 || -Vin ||
|  6 || −Vin ||
|-
|-
|- bgcolor="LightGrey"
|- bgcolor="LightGrey"
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|-
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
|  9 || -5V ||
|  9 || −5 V ||
|-
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 10 || -5V ||
| 10 || −5 V ||
|-
|-
|- bgcolor="LightGreen"   
|- bgcolor="LightGreen"   
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|-
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 14 || +5V ||
| 14 || +5 V ||
|-
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
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|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 19 || -Output 3 ||
| 19 || −Output 3 ||
|-  
|-  
|- bgcolor="Yellow"  
|- bgcolor="Yellow"  
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|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 22 || -Output 2 ||
| 22 || −Output 2 ||
|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
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|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 25 || -Output 1 ||
| 25 || −Output 1 ||
|-
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
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|-
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 31 || +5V ||
| 31 || +5 V ||
|-
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 32 || -5V ||
| 32 || −5 V ||
|-
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
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<gallery>
<gallery>
M377 as u310 and u410 in 11a52.jpg|M377 in an [[11A52]], as U310 and U410. Each M377 chip has a differential output impedance of 200 Ω. The two chips' outputs are in parallel, driving the output pins of the plug-in with a differential impedance of 100 Ω, or 50 Ω per side.
M377 as u310 and u410 in 11a52.jpg|M377 in an [[11A52]], as U310 and U410. Each M377 chip has a differential output impedance of 200 Ω. The two chips' outputs are in parallel, driving the output pins of the plug-in with a differential impedance of 100 Ω, or 50 Ω per side.
Tek 11a52 m377.jpg|Two M377 chips (packaged as part number 165-2129-03) in an [[11A52]].
Tek 11a52 m377.jpg|Two M377 chips (packaged as part number 165-2129-03) in an [[11A52]]
Tek m377 die.jpg|M377 die
Tek m377 die.jpg|M377 die
1987-02-10 M377 mounted on H2089.jpg
1987-02-10 M377 mounted on H2089.jpg
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/57216"