M377

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The M377 is a Tek-made amplifier integrated circuit designed by John Addis. It is used in the 11A16, 11A32, 11A33, 11A34, and 11A52.

About the M377, John Addis says:

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, three outputs which could be separately inverted and turned on or off.

It was the first wideband analog IC with level shift on chip (allowing 0 V common mode input and output and without PNP transistors), first wideband amplifier with any on-chip bandwidth limit selection, first to have more than two fixed gain settings (it has six), 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. It also had excellent overdrive recovery.

The packaged M377 die has the following Tek part numbers:

Instrument Instrument SN range Part Number Output R/side Components on ceramic hybrid
11A32 B010100 - B031028 165-2089-03 100 ohms M377 chip only
11A32 B031029 - up 165-2089-05 100 ohms M377 chip only
11A34 B010100 - B031044 165-2089-04 200 ohms M377 chip only
11A34 B031045 - up 165-2089-06 200 ohms M377 chip only
11A52 B010100 - B010179 165-2129-02 100 ohms Diode bridge + 50 ohm input R + M377 chip
11A52 B010180 - up 165-2129-03 100 ohms Diode bridge + 50 ohm input R + M377 chip


165-2089-xx Pinout

Pin Function Notes
1 GP0 gain select bit 0
2 STB data strobe for gain and bandwidth limit
3 +15V
4 +Vin
5 Analog ground
6 -Vin
7 Analog ground
8 Var Gain
9 -5V
10 -5V
11 Output 1 Invert
12 Output 1 Enable
13 Analog Ground
14 +5V
15 Output 2 Invert
16 Output 2 Enable
17 +5V
18 Output 3 Enable
19 -Output 3
20 +Output 3
21 Output 3 HF Adjust
22 -Output 2
23 +Output 2
24 Output 2 HF Adjust
25 -Output 1
26 +Output 1
27 Output 1 HF Adjust
28 Ground
29 Ground
30 Ground
31 +5V
32 -5V
33 BP1 bandpass select bit 1
34 BP0 bandpass select bit 0
35 GP2 gain select bit 2
36 GP1 gain select bit 1

Pin function legend

Power pins
Ground pins
HF signals
TTL digital control signals
analog control signals

Links