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The '''M377''' is a Tek-made amplifier integrated circuit designed by [[John Addis]].   
{{Monolithic IC
|Manufacturer=Tektronix
|Model=M377
|Part_nos=165-2129-03,165-2089-06,155-2089-05
|Description=amplifier  
|an=an
|Used_in=11A16;11A32;11A33;11A34;11A52;2245;2245A;2247;2247A;2252;TDS410;TDS420;TDS460;TDS520D;TDS540D;TDS580D;TDS680C;TDS684C;TDS714L;TDS724D;TDS754D;TDS784D;
|Designers=John Addis
}} designed by [[John Addis]].   
 
Its initial use was in the [[11A16]], [[11A32]], [[11A33]], [[11A34]] and [[11A52]] plug-ins.
Its initial use was in the [[11A16]], [[11A32]], [[11A33]], [[11A34]] and [[11A52]] plug-ins.
Later, it was also used in the following oscilloscopes:
* [[TDS410|TDS 410]] / [[TDS420|TDS 420]] /[[TDS460|TDS 460]]
* [[TDS520|TDS 520D]] / [[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,  
The M377 was a single-channel plugin on a chip with 0 V common mode input and output voltages,  
excellent variable gain control, two four pole bandwidth limits,  
excellent variable gain control, two four-pole bandwidth limits, and three outputs which could be separately inverted and turned on or off.  
three outputs which could be separately inverted and turned on or off.  
 
</p>
It was the first wideband analog IC with level shift on chip (allowing 0 V common mode input  
<p>
and output and without PNP transistors), first wideband amplifier with any on-chip bandwidth  
It was the first wideband analog IC with level shift on chip (allowing 0 V common mode input and output and  
limit selection, first to have more than two fixed gain settings (it has six), first to require
without PNP transistors), first wideband amplifier with any on-chip bandwidth limit selection,  
only one transient response adjustment (no thermals), and the first to have a highly linear
first to have more than two fixed gain settings (it has six),  
relationship between a control voltage and gain. It also had excellent overdrive recovery.
and first to require only one transient response adjustment (no thermals),  
 
and the first to have a highly linear relationship between a control voltage and gain.  
''(See also [[M777|John's comments on the M777 successor]].)''
It also had excellent overdrive recovery.
</p>
</blockquote>
</blockquote>


* [[Media:M377 Component Specification.pdf | M377 Component Specification (PDF)]]
Later, the M377 and M777 were also used in several other Tek instruments.
If the instrument has more than 300 MHz bandwidth at 1 mV/div sensitivity,
it can be assumed to be using the M777 which makes use of Tek's later IC fabrication process
that provides transistor with higher f<sub>t</sub>.
 
The M377 and M777  are in the following instruments based on the specified bandwidth at 1 mV/div:
{| class="wikitable"
|+ M377
|-
|[[2245]] || [[2245A]] || [[2247]] || [[2247A]] || [[2252]]
|-
|[[AM503A]] || [[AM503B]]
|-
|[[TDS410]] || [[TDS420]] || [[TDS460]]
|-
|[[TDS520]] || [[TDS520A]] || [[TDS524A]]
|-
|[[TDS540]] || [[TDS540A]] || [[TDS544A]]
|-
|[[TDS620B]] || [[TDS644B]]
|-
|[[TDS654C]] 
|-
|}
 
{| class="wikitable"
|+ M777
|-
|[[TDS520B]] || [[TDS520C]] || [[TDS520D]] || [[TDS540B]] || [[TDS540C]] || [[TDS540D]] || [[TDS580D]]
|-
|[[TDS680B]] || [[TDS680C]] || [[TDS684A]] || [[TDS684B]] || [[TDS684C]]
|-
|[[TDS714L]] || [[TDS724A]] || [[TDS724C]] || [[TDS724D]] || [[TDS744A]] || [[TDS754C]] || [[TDS754D]]
|-
|[[TDS784A]] || [[TDS784C]] || [[TDS784D]]
|-
|}
 
== Links ==
* [[John Addis]], ''[[Media:Electronic-Engineering-Aug-Sept-1988-Versatile-Analogue-Chip-John-Addis.pdf|Versatile Analogue Chip for Oscilloscope Plug-ins]]''. Electronic Engineering, London, August/September 1988.
* [[Media:M377 Component Specification.pdf | M377 Component Specification]]
 
==Packaging of the M377==
==Packaging of the M377==
The packaged M377 die has the following Tek part numbers:
11000 series instruments and the [[AM503A]] and [[AM503B]] use a 1.22 cm square, flat ceramic package compatible with the Hypcon connector.
The ceramic rests on a heat sink supplied by the instrument’s chassis.
 
TDS series oscilloscopes use a J lead package with a tall heat sink.  The package is soldered to the circuit board.
 
The ceramic-packaged M377 die has the following Tek part numbers:
* [[165-2129-03]]
* [[165-2129-03]]
* [[165-2089-06]]
* [[165-2089-06]]
* [[155-2089-05]] (11A33)
* [[155-2089-05]] (11A33)
* [[165-2456-00]] (AM503A as [[M694]], M377 with relaxed DC balance specs)
* [[165-2456-00]] (AM503B as [[M694]], M377 with relaxed DCbalance specs)


{| class="wikitable"
{| class="wikitable"
Line 42: Line 91:
|-
|-
|11A32 || B031029 - up || 165-2089-05 || 100 Ω || M377 chip only
|11A32 || B031029 - up || 165-2089-05 || 100 Ω || M377 chip only
|-
|11A33 || B010101 - up || 165-2089-05 || 100 Ω || M377 chip only
|-
|-
|11A34 || B010100 - B031044 || 165-2089-04 || 200 Ω || M377 chip only
|11A34 || B010100 - B031044 || 165-2089-04 || 200 Ω || M377 chip only
Line 50: Line 101:
|-
|-
|11A52 || B010180 - up || 165-2129-03 || 100 Ω || Diode bridge + 50 Ω input R + M377 chip
|11A52 || B010180 - up || 165-2129-03 || 100 Ω || Diode bridge + 50 Ω input R + M377 chip
|-
|AM503A || B010101 - up || 165-2456-00 || 100 Ω || M377 chip only aka M694 (relaxed DC bal spec)
|-
|AM503B || B010101 - up || 165-2456-00 || 100 Ω || M377 chip only aka M694 (relaxed DC bal spec)
|-
|-
|}
|}
Line 58: Line 113:
* Output invert
* Output invert
* Output enable. When an output is disabled, it has no offset and maintains the specified termination impedance. That is, the internal parallel output termination remains connected, but the signal current is shut off. The self-calibration of 11k systems makes use of this property.
* Output enable. When an output is disabled, it has no offset and maintains the specified termination impedance. That is, the internal parallel output termination remains connected, but the signal current is shut off. The self-calibration of 11k systems makes use of this property.
* High-frequency adjustment. The HF ADJ pins have 2k ohms input resistance to ground. The nominally acceptable inputs are ±1V to ground.  Because the input resistance tracks the nichrome standard resistors inside the chip, the input is actually current sensitive, not that it makes much difference. This current affects the standing current in a feedback amplifier and hence its open loop gain. At low frequencies, the gain of the M377 is determined entirely by resistor values. At high frequencies, there is phase shift and changing the open loop gain will also change the closed loop gain, hence the transient response.
* High-frequency adjustment. The HF ADJ pins have 2 kΩ input resistance to ground. The nominally acceptable inputs are ±1 V to ground.  Because the input resistance tracks the nichrome standard resistors inside the chip, the input is actually current sensitive, not that it makes much difference. This current affects the standing current in a feedback amplifier and hence its open loop gain. At low frequencies, the gain of the M377 is determined entirely by resistor values. At high frequencies, there is phase shift and changing the open loop gain will also change the closed loop gain, hence the transient response.


==Var Gain Control Signal==
==Var Gain Control Signal==
Line 67: Line 122:


==165-2089-xx Pinout==
==165-2089-xx Pinout==
In the 11A32, 11A34, and 11A52, pairs of 165-2089-xx IC are placed on the board so that their outputs are facing one another,  
In the 11A32, 11A34, and 11A52, pairs of 165-2089-xx IC are placed on the board so that their
allowing their outputs to be wired in parallel with a minimum of board complexity and asymmetry.
outputs are facing one another, allowing their outputs to be wired in parallel with a minimum  
of board complexity and asymmetry.
The purpose of the three output channels varies depending on the rotational orientation of the IC on the board.
The purpose of the three output channels varies depending on the rotational orientation of the IC on the board.
* Output 1 (pins 25 and 26) is either AUX SIG (aka AUX TRIGGER) or DISPLAY,  
* Output 1 (pins 25 and 26) is either AUX SIG (aka AUX TRIGGER) or DISPLAY,  
Line 79: Line 135:
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 reason for this is that the DISPLAY and TRIGGER outputs are in parallel with the corresponding output from another
the three outputs. The reason for this is that the DISPLAY and TRIGGER outputs are in parallel  
M377, which forms a broadband termination. In contrast, the AUX SIG outputs are not combined, and therefore have
with the corresponding output from another
1/4 W resistors on the PCB, shunting to ground. The 1/4 W resistors become inductive at high frequencies, so the optimal
M377, which forms a broadband termination. In contrast, the AUX SIG outputs are not combined,  
HF adjustment for the AUX SIG output is different than for the DISPLAY and TRIGGER outputs.
and therefore have ¼ W resistors on the PCB, shunting to ground. The ¼ W resistors become  
inductive at high frequencies, so the optimal HF adjustment for the AUX SIG output is different
than for the DISPLAY and TRIGGER outputs.


{|
|-
|width="33%" valign="top"|
{| class="wikitable"
{| class="wikitable"
|-
|-
Line 90: Line 151:
! Function
! Function
! Notes
! Notes
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
|  1 || GP0 || gain select bit 0
|  1 || GP0 || gain select bit 0
|-
|- bgcolor="LightGreen"   
|- bgcolor="LightGreen"   
|  2 || STB || data strobe for gain and bandwidth limit
|  2 || STB || data strobe for gain and bandwidth limit
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
|  3 || +15 V ||
|  3 || +15 V ||
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
|  4 || +Vin ||
|  4 || +V<sub>in</sub> ||
|-
|- bgcolor="LightGrey"
|- bgcolor="LightGrey"
|  5 || Analog ground ||
|  5 || Analog ground ||
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
|  6 || −Vin ||
|  6 || −V<sub>in</in>||
|-
|- bgcolor="LightGrey"
|- bgcolor="LightGrey"
|  7 || Analog ground ||
|  7 || Analog ground ||
|-
|- bgcolor="LightBlue"
|- bgcolor="LightBlue"
|  8 || Var Gain ||
|  8 || Var Gain ||
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
|  9 || −5 V ||
|  9 || −5 V ||
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 10 || −5 V ||
| 10 || −5 V ||
|-
|- bgcolor="LightGreen"   
|- bgcolor="LightGreen"   
| 11 || Output 1 Invert ||
| 11 || Output 1 Invert ||
|-
|- bgcolor="LightGreen"   
|- bgcolor="LightGreen"   
| 12 || Output 1 Enable ||
| 12 || Output 1 Enable ||
|}
|width="33%" valign="top"|
{| class="wikitable"
|-
|-
! Pin
! Function
! Notes
|- bgcolor="LightGrey"
|- bgcolor="LightGrey"
| 13 || Analog Ground ||
| 13 || Analog Ground ||
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 14 || +5 V ||
| 14 || +5 V ||
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 15 || Output 2 Invert ||
| 15 || Output 2 Invert ||
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 16 || Output 2 Enable ||
| 16 || Output 2 Enable ||
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 17 || Output 3 Invert ||
| 17 || Output 3 Invert ||
|-
|- bgcolor="LightGreen"   
|- bgcolor="LightGreen"   
| 18 || Output 3 Enable ||
| 18 || Output 3 Enable ||
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 19 || −Output 3 ||
| 19 || −Output 3 ||
|-
|- bgcolor="Yellow"  
|- bgcolor="Yellow"  
| 20 || +Output 3 ||
| 20 || +Output 3 ||
|-
|- bgcolor="LightBlue"
|- bgcolor="LightBlue"
| 21 || Output 3 HF Adjust || See "High-frequency adjustment" above
| 21 || Output 3 HF Adjust || See "High-frequency adjustment" above
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 22 || −Output 2 ||
| 22 || −Output 2 ||
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 23 || +Output 2 ||
| 23 || +Output 2 ||
|-
|- bgcolor="LightBlue"
|- bgcolor="LightBlue"
| 24 || Output 2 HF Adjust || See "High-frequency adjustment" above
| 24 || Output 2 HF Adjust || See "High-frequency adjustment" above
|}
|width="33%" valign="top"|
{| class="wikitable"
|-
|-
! Pin
! Function
! Notes
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 25 || −Output 1 ||
| 25 || −Output 1 ||
|-
|- bgcolor="Yellow"
|- bgcolor="Yellow"
| 26 || +Output 1 ||
| 26 || +Output 1 ||
|-
|- bgcolor="LightBlue"
|- bgcolor="LightBlue"
| 27 || Output 1 HF Adjust || See "High-frequency adjustment" above
| 27 || Output 1 HF Adjust || See "High-frequency adjustment" above
|-
|- bgcolor="LightGrey"  
|- bgcolor="LightGrey"  
| 28 || Ground ||
| 28 || Ground ||
|-
|- bgcolor="LightGrey"  
|- bgcolor="LightGrey"  
| 29 || Ground ||
| 29 || Ground ||
|-
|- bgcolor="LightGrey"
|- bgcolor="LightGrey"
| 30 || Ground ||
| 30 || Ground ||
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 31 || +5 V ||
| 31 || +5 V ||
|-
|- bgcolor="Pink"  
|- bgcolor="Pink"  
| 32 || −5 V ||
| 32 || −5 V ||
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 33 || BP1 || bandpass select bit 1
| 33 || BP1 || bandpass select bit 1
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 34 || BP0 || bandpass select bit 0
| 34 || BP0 || bandpass select bit 0
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 35 || GP2 || gain select bit 2
| 35 || GP2 || gain select bit 2
|-
|- bgcolor="LightGreen"  
|- bgcolor="LightGreen"  
| 36 || GP1 || gain select bit 1
| 36 || GP1 || gain select bit 1
|-
|}
|}
|}


Line 215: Line 254:
|}
|}


==Pictures==
<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.
Line 225: Line 265:
==Schematics==
==Schematics==
* [[Media:Tek M377 stage 1.pdf|Tektronix M377 Stage 1 Schematic (PDF)]]
* [[Media:Tek M377 stage 1.pdf|Tektronix M377 Stage 1 Schematic (PDF)]]
* [[Media:Tek m377 stage 1 control.pdf|Tektronix M377 Stage 1 Control Schematic (PDF)]]
* [[Media:M377 stage2.pdf|Tektronix M377 Stage 2 Schematic (PDF)]]
* [[Media:M377 stage2 control.pdf|Tektronix M377 Stage 2 Control Schematic (PDF)]]
* [[Media:M377 stage3 rough.pdf|Tektronix M377 Stage 3 Schematic (PDF, rough)]]


== Links ==
* [[Media:Electronic-Engineering-Aug-Sept-1988-Versatile-Analogue-Chip-John-Addis.pdf|Article in Electronic Engineering Magazine on M377 by John Addis]]


[[Category:Tektronix-made monolithic integrated circuits]]
[[Category:Tektronix-made monolithic integrated circuits]]
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