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{{Monolithic IC | |||
|Manufacturer=Tektronix | |||
|Model=M084 | |||
|Part_nos=155-0078-xx,155-0273-00,155-0274-00 | |||
|Description=broadband vertical amplifier | |||
|Used_in=464;465;466;468;475;475A;475M;485;7834;7844;7854;7904;R7903;R7912;7912AD;7912HB;7104;7A16A;7A16P;7A24;7A26;7A42;067-0587-01;067-0680-00;AM503;PG502;PG508;DC510;DC5010;FG5010 | |||
|Designers=John Addis; | |||
}} in a [[minipac]] package. | |||
The input and output are differential. | The input and output are differential. | ||
The 155-0078 | The 155-0078 and its test fixture were designed by [[John Addis]] for the [[485]] scope <sup>(Note 1)</sup>, which uses no less than 18 of these chips in various grades. | ||
The last two digits of the part number, the grade, correspond to a combination of DC and HF performance. | |||
Each M84 was tested for DC performance and HF performance. | |||
DC performance was tested using a custom fixture described below. | |||
HF performance was tested using the [[25ps Push-Pull Pulse Generator]]. | |||
{| class="wikitable" style="float:right; margin-left: 15px" | {| class="wikitable" style="float:right; margin-left: 15px" | ||
|+ The last two digits of the 155-0078-xx part number are determined by a selection process after manufacture | |+ The last two digits of the 155-0078-xx part number are determined by a selection process after manufacture: | ||
! Suffix !! Speed !! DC Charact. !! Replaceable by | |||
! | |||
|- | |- | ||
| 00 || Fast || Best || ---- | | 00 || Fast || Best || ---- | ||
Line 36: | Line 47: | ||
|} | |} | ||
The | The M84 also comes in 14-pin DIP, as 155-0273-00 and 155-0274-00 (slower grade). | ||
Regarding the various grades of M84, John Addis says: | |||
<blockquote> | |||
There are several DC specs which differ with part suffix. | |||
Suffixes -10, -11, -12 and -13 were used for the redesigned M84, known as the [[M705]]. | |||
The M705 was necessary because the original [[SH2]] (2-2.5GHz?) process was being discontinued. | |||
The M705 was designed by [[Hal Lilliwhite]] using the faster [[SH3]] process (6-7GHz). | |||
Additionally, the M705 apparently had the gain setting resistor laser trimmed at the wafer level. | |||
The M705 was designed in late 1989 and tested in early 1990. | |||
There was one high frequency test fixture and perhaps two dc test fixtures. | |||
Every M84 was subjected to all tests. | |||
All tests were done manually. | |||
I designed both test fixtures and the 25ps PPPG. | |||
Transient Response (schematic not shown) uses the [[25ps Push-Pull Pulse Generator|25ps Push Pull Pulse Generator (PPPG)]] and a sampling scope. | |||
Sampler load supplies dc current (through X2 pads and sampler input resistance. | |||
The sampling scope chassis is floating at (probably) +5V through 8.2 ohms. | |||
25ps PPPG has transformer coupled trigger output to sampling scope trigger input. | |||
DC test fixture: | |||
I have attached a schematic of a dc test fixture for manufacturing. | |||
It looks like this fixture only tests for V<sub>hump</sub>. | |||
There may have been another test fixture for the other dc tests. | |||
Those tests may have been done on a system. | |||
The V<sub>hump</sub> test may have been so difficult to perform on an automated system that it needed this extra fixture. | |||
V<sub>hump</sub> is the amount of maximum dc imbalance, probably referred to the input, which occurs when the variable gain function is swept from full invert to full normal. | |||
The two ends of the curve are set to the same dc output level using the balance control attached to pin 1. | |||
Ideally, there is no change in dc level under these conditions, but various imbalances in the M84 output devices result in a hump for inverted gain and a hump for the normal gain. | |||
Only the -00, -04 and -10 suffixed parts were required to pass this stringent V<sub>hump</sub> test. | |||
The fixture was in a rubber footed metal chassis about 4” high 5” deep, and 7” wide. | |||
</blockquote> | |||
:{| class="wikitable" | |||
|+ Test criteria defining the various grades of M84: | |||
|- | |||
| Displayed Risetime <355 ps || -00 and -10 || -01 and -11 || -02 and -12 || -03 and -13 | |||
|- | |||
|Displayed Risetime 355-410 ps || -04 || -05 || -06 || -07 | |||
|- | |||
|Normal Offset (RTO) || <14 mV || <14 mV || <28 mV || <14 mV | |||
|- | |||
|Invert Offset (RTO) || <14 mV || <14 mV || <28 mV || <14 mV | |||
|-|| | |||
|HFE of Q1 and Q2 || 70-250 || 70-250 || 50-400 || 70-250 | |||
|- | |||
|Normal Gain || 2.68-2.96 || 2.68-2.96 || 2.68-2.96 || 2.68-2.96 | |||
|- | |||
|Invert Gain || 2.68-2.96 || 2.68-2.96 || 2.68-2.96 || 2.68-2.96 | |||
|- | |||
|Null Offset (Gain = 0) || 10 mV || no spec || no spec || <30 mV | |||
|- | |||
|Null Gain (Test of Q3 and Q4) || 14 mV || no spec || no spec || <14 mV | |||
|- | |||
|50% Gain || 0.49-0.51 || no spec || no spec || 0.49-0.51 | |||
|- | |||
|Off Feedthrough || <0.2 mV || <0.2 mV || <0.2 mV || <0.2 mV | |||
|- | |||
|Normal Hump Voltage || <2.5 mV || no spec || no spec || no spec | |||
|- | |||
|Invert Hump Voltage || <2.5 mV || no spec || no spec || no spec | |||
|} | |||
* [[Media:Tek m84.pdf|Tektronix M84 155-0078-00 Description (PDF)]] | * [[Media:Tek m84.pdf|Tektronix M84 155-0078-00 Description (PDF)]] | ||
==See also== | |||
* [[234-0203-20]]: [[SH3]] version | |||
==Pictures== | ==Pictures== | ||
Line 44: | Line 123: | ||
Tek 155-0078-00 excerpt from 067-0587-01.png|Excerpt from [[067-0587-01]] schematic, showing application of 155-0078-00. | Tek 155-0078-00 excerpt from 067-0587-01.png|Excerpt from [[067-0587-01]] schematic, showing application of 155-0078-00. | ||
155-0078-01.jpg | 155-0078-01 amplifiers in [[7A26]]. Note symmetric layout. | 155-0078-01.jpg | 155-0078-01 amplifiers in [[7A26]]. Note symmetric layout. | ||
M84 Hump Voltage test fixture.jpg|M84 Hump Voltage Test Fixture schematic | |||
Tek 155-0078-10.jpg|155-0078-10 | |||
Tek 155-0078-10 underside.jpg|155-0078-10 | |||
</gallery> | </gallery> | ||
==Used in== | ==Used in== | ||
* [[475]] (U140, U240, U450) | * [[464]], [[465]], [[466]], [[468]] | ||
* [[475]] (U140, U240, U450), [[475A]], [[475M]] | |||
* [[485]] | * [[485]] | ||
* [[2220]], [[2221]], [[2230]] (155-0274-00: A1U130, A1U180; 155-0273-00: A2U30, A2U80) | |||
* [[7834]], [[7844]] (U415,U515) | * [[7834]], [[7844]] (U415,U515) | ||
* [[7854]] (A13U520,A13U590,A13U620,A13U680) | * [[7854]] (A13U520,A13U590,A13U620,A13U680) | ||
* [[7904]], [[ | * [[7904]], [[R7903]] (U5510,U5530,U5550,U5610,U5630,U5650) | ||
* [[7912AD]], [[7912HB]] | * [[R7912]], [[7912AD]], [[7912HB]] | ||
* [[ | * [[7104]] | ||
* [[7A16P]] (U60240, U60340, U60440, U60540) | * [[7A16A]] (U350, U450, U550, U750), [[7A16P]] (U60240, U60340, U60440, U60540) | ||
* [[7A24]], [[7A26]] (U1350,U1450,U1550,U1750,U2350,U2450,U2550,U2750) | * [[7A24]], [[7A26]] (U1350,U1450,U1550,U1750,U2350,U2450,U2550,U2750) | ||
* [[7A26]] | |||
* [[7A42]] (A5U1010,A5U1020,A5U1040,A5U1060) | * [[7A42]] (A5U1010,A5U1020,A5U1040,A5U1060) | ||
* [[067-0587-01]] | * [[067-0587-01]], [[067-0680-00]] | ||
* [[AM503]] | * [[AM503]] | ||
* [[PG502]] (U360, -06) | * [[PG502]] (U360, -06) | ||
* [[DC510]] (A12U1311, A12U1331, -10) | * [[PG508]] (U850) | ||
* [[DC510]] (A12U1311, A12U1331, -10), [[DC5010]] | |||
* [[FG5010]] | |||
==Notes== | ==Notes== | ||
* Note 1: See John Addis quote in [[7A11]] article | * Note 1: See John Addis quote in [[7A11]] article | ||
==Datasheet== | |||
* [[Media:Tek 155-0078-10.pdf|Tektronix 155-0078-10 Datasheet (PDF)]] | |||
[[Category:Tektronix-made integrated circuits]] | [[Category:Tektronix-made monolithic integrated circuits]] | ||
[[Category:Minipac]] | [[Category:Minipac]] |