THAT2181 THAT Corporation, THAT2181 Datasheet
THAT2181
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THAT2181 Summary of contents
Page 1
... BIAS CURRENT COMPENSATION Input 1 6 Gnd Figure 1. 2181 Series Equivalent Circuit Diagram THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Voltage Controlled Amplifiers THAT 2181A, 2181B, 2181C APPLICATIONS · Faders · ...
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... No Signal -3.1 -2.85 -2.6 -3.1 -2.85 -2.6 = +15V –15V. Test circuit is as shown in Figure 2. SYM ADJ is ad THAT2181 Series IC VCAs = 25° 75°C) 330 +70° -40 to +125°C ST 2181B 2181C Typ Max ...
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... Series VCA IN 20k 10u Power Supplies Vcc = +15 V Vee = -15 V Figure 3. 2181 Series Frequency Response Vs. Gain THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com 2181A Conditions Min Typ Max Min 1 kHz — ...
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... Ec-. Temperature Effects Iadj The logging and antilogging in the VCA depends on the logarithmic relationship between voltage and current in a semiconductor junction (in particular, between a transistor THAT2181 Series IC VCAs , Pin 2) at 25°C C+ and well known, this relation- c ...
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... Figure 2, Page 3, the usual method of applying this offset is to use the internal 25 W resistor along with a Figure 9. Representative DC Offset Vs. Gain THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com larger value resistor to form a voltage divider connected to the wiper of a trim pot across the supply rails ...
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... For best results, this resistor should be kept above. Stability An additional consideration is stability: the inter- nal op amp is intended for operation with source im- pedances of less than high frequencies. For most audio applications, this will present no problem THAT2181 Series IC VCAs ...
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... THAT Corporation intends to publish an applica- tion note covering operation on low supply voltages. Please inquire for its availability. THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com The highest permissible supply voltage is fixed by the process characteristics and internal power consumption ...
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... Vcc Ec- 1 OUT -IN SYM 8 Ec+ 4 GND Rsym 5.1k 680k (2181A) 220k (2181B) 130k (2181C) Vee Ec+ Figure 15. Positive Control Port Using Pin 4 THAT2181 Series IC VCAs 22p 20k - OP275 OUT + Vee 50k SYM ADJ Vcc ...
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... Figure 16. -L (SIP) Version Package Outline Drawing THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com ground via a modest-sized capacitor (e.g., 10 mF). If the distortion diminishes, signal pickup in the control path is the likely cause ...
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... Page 10 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Notes THAT2181 Series IC VCAs ...