1203

T H AT Corporation FEATURES · High common-mode rejection (typical 90 dB at 60 Hz) maintained under real-world conditions Excellent solution for hum and groundloop suppression Transformer-like noise rejection in an 8-pin IC, at fraction of transformer cost and size · · · · InGeniusâ High-CMRR Balanced Input Line Receiver THAT 1200, 1203, 1206 APPLICATIONS Balanced input stages Summing amplifiers Transformer front-end replacements ADC front-ends · · Description The THAT 1200 series of InGenius balanced line receivers are designed to overcome a serious limitation of conventional balanced input stages — notoriously poor common mode rejection in real world applications. While conventional input stages may exhibit good rejection characteristics in the lab and on paper, they perform poorly when fed from even slightly unbalanced source impedances — a common situation in almost any pro sound environment. Developed by Bill Whitlock of Jensen Transformers, the patented InGenius input stage uses a unique bootstrap circuit to raise its commonmode input impedance into the megohm range, but without the noise penalty that comes from high-valued resistors. InGenius line receivers maintain their high CMRR over a wide range of source impedance imbalances — even when fed from single-ended sources. Pin Name DIP Pin 1 2 3 4 5 6 7 8 SO Pin 3 4 5 6 11 12 13 14 OA1 INRa +1 Rc Ref R1 R2 Vcc Vee Vout InIn+ Vee CM In Vout Vcc OA4 +1 OA3 + R4 R5 Rb IN+ OA2 Rd +1 R3 CM Out REF Table 1....