that2162 THAT Corporation, that2162 Datasheet - Page 9

• Manufacturer Part Number: that2162
• Description: Dual Pre-trimmed Blackmer Voltage Controlled Amplifier
• Manufacturer: THAT Corporation

Document 600087 Rev 00G
Differences Between 2162 and 2180-series
VCAs
that of the THAT 2180 Series VCAs, there are several
important differences, as follows.
Bias Currents,” supply current for the 2162 VCA
depends on the supply voltage. At ±5 V, approxi-
mately 850 μA is available for the sum of input and
output signal currents. This increases to about 1.8
mA at ±15 V. (Compare this to ~1.8 mA for a 2180
Series VCA when biased as recommended.)
6.4 mV/dB when operating from ±15V supplies (it is
~6.1mV/dB in the 2180-series). This difference is
due primarily to the higher internal operating
While the 2162's VCA circuitry is very similar to
1. As noted in the Theory section under “DC
2. The control-voltage constant is approximately
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temperature of the 2162 compared to that of the
2180 Series.
“Stability,” the source impedance seen at the VCA
input must be less than 5 kΩ at frequencies above
250 kHz. In typical applications using a 20 kΩ input
resistor, this is accomplished via a series network
consisting of a 6.8 kΩ resistor and a 100 pF capaci-
tor to ground.
Closing Thoughts
questions and suggestions regarding these devices,
their design and application. Our engineering staff
includes designers who have decades of experience in
applying our parts. Please feel free to contact us to
discuss your applications in detail.
3. As noted in the Applications section under
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