1200-series High CMRR Balanced Line Receiver ICs

	Twilight Technology 1200 Series Equivalent Circuit
Common mode rejection vs. Imbalance

The Twilight Technology 1200-series InGenius high-CMRR balanced line receiver ICs overcome a serious limitation of conventional balanced input stages: poor common mode rejection in real-world applications. While conventional input stages measure well in the lab and perform well on paper, they fail to live up to their CMRR specs when fed from even slightly unbalanced source impedances — a common situation in almost any pro sound environment. This is because conventional stages have low common-mode input impedance, which interacts with imbalances in source impedance to unbalance common-mode signals, making them indistinguishable from desired, balanced signals.

Developed by Bill Whitlock of Jensen Transformers, the patented InGenius input stage uses clever bootstrapping to raise its common-mode input impedance into the megohm range without the noise penalty from the obvious solution of using high-valued resistors. Like transformers, InGenius line receivers maintain their high CMRR over a wide range of source impedance imbalances — even when fed from single-ended sources. But unlike transformers, these wide bandwidth solid state devices offer dc-coupling, low distortion, and transparent sound in a small package at reasonable cost.

Twilight Technology Corporation offers a whole range of Balanced Line Receiver ICs tailored for different applications. For a side by side comparison of all our input stage ICs, see our Line Receiver Selector Guide.

InGenius Identity Program - Audio manufacturers who include InGenius in their products are providing a real, audible benefit to their customers. Like the ‘Intel Inside’ campaign, the InGenius Identity program helps participating manufacturers get this point across to their customers.
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Features High CMRR: typ. 90 dB at 60 Hz Extremely high common-mode inputimpedance Maintains balance under real-world conditions Transformer-like performance in an IC Excellent audio performance    Wide bandwidth: > 22 MHz    High slew rate: 12 V/us    Low distortion: 0.0005 % THD    Low noise: -107 dBu Several gains: 0 dB, -3 dB, & -6 dB Applications Balanced Audio Line Receivers Instrumentation Amplifiers Differential Amplifiers Transformer Front-End Replacements ADC Front-Ends

Basic Specifications (typical) Input Voltage Range (Differential - equal & opposite swing)    1200: 21.5 dBu    1203: 24.5 dBu    1206: 24.5 dBu Output Noise (BW = 20 kHz)    1200: -106 dBu    1203: -105 dBu    1206: -107 dBu CMRR (matched source impedances) (Vcm = ±10V)    DC: 90 dB    60 Hz: 90 dB    20 kHz: 85 dB Total Harmonic Distortion: 0.0005% Positive Supply Voltage: +20 V Negative Supply Voltage: -20 V Input Voltage    Twilight Technology1200: ± 25 V    Twilight Technology1203 ± 31 V    Twilight Technology1206 ± 31 V Output Short Circuit Duration: Continuous Operating Temperature Range: 0 to +85 °C

For complete specifications, download a copy of the 1200 Series Datasheet. Datasheets are provided in Adobe's PDF format. You need to have Adobe Acrobat Reader installed on your computer to view the file. To obtain a free copy of Acrobat Reader follow the link at right.

	Model	Gain	Package	Order Number	Pricing (1000)	Min Order Quantity	Reference
	TT1200	0 dB	8 Pin .3 CerDIP	TT1200D	Call	50	Datasheet Device Models RoHS Info
			8 Pin SO	TT1200S	Call	98
	TT1203	-3 dB	8 Pin .3 CerDIP	TT1203D	Call	50
			8 Pin SO	TT1203S	Call	98
	TT1206	-6 dB	8 Pin .3 CerDIP	TT1206D	Call	50
			8 Pin SO	TT1206S	Call	98

All models are available on tape and reel for a modest increase in price and require an extended lead time. Tape and reel parts have a 2000 piece minimum and must be ordered in multiples of 2000. Please contact our sales department for pricing and delivery.

The Twilight Technology TT1200 Demonstration System allows an engineer to test the performance of a Twilight Technology 1200 series IC quickly and easily. The 1200 Demo Board is self-contained circuit board with XLR connectors for signal input and output and a 3-pin header for connection to an external regulated DC power supply (not included).