InGenius High-CMRR THAT Corporation Balanced Input Line Receiver ICs THAT 1200, 1203, 1206 FEATURES APPLICATIONS High CMRR: typ. 90 dB at 60 Hz Extremely high common-mode input Balanced Audio Line Receivers impedance Maintains balance under real-world Instrumentation Amplifiers conditions Transformer-like performance in an IC Differential Amplifiers Excellent audio performance Wide bandwidth: typ. > 22 MHz High slew rate: typ. 12 V/us Transformer Front-End Replacements Low distortion: typ. 0.0005 % THD Low noise: typ. -107 dBu ADC Front-Ends Several gains: 0 dB, -3 dB, & -6 dB Description The THAT 1200-series InGenius balanced line Developed by Bill Whitlock of Jensen receivers overcome a serious limitation of Transformers, the patented InGenius input conventional balanced input stages: poor common stage uses clever bootstrapping to raise its mode rejection in real-world applications. While common-mode input impedance into the meg- conventional input stages measure well in the lab ohm range without the noise penalty from the and perform well on paper, they fail to live up to obvious solution of using high-valued resistors. their CMRR specs when fed from even slightly Like transformers, InGenius line receivers unbalanced source impedances a common maintain their high CMRR over a wide range of situation in almost any pro sound environment. source impedance imbalances even when fed This is because conventional stages have low from single-ended sources. But unlike trans- common-mode input impedance, which interacts formers, these wide bandwidth solid state de- with imbalances in source impedance to unbalance vices offer dc-coupling, low distortion, and common-mode signals, making them indistin- transparent sound in a small package at rea- guishable from desired, balanced signals. sonable cost. Pin Name DIP Pin SO Pin OA1 R6 R1 R2 Ref 1 1 IN- +1 Vcc In- 2 2 R10 R7 Vee 24K OA4 OA3 In+ 3 3 - +1 Vout + Vee 4 4 R11 R8 24K CM In 5 5 R3 R4 +1 IN+ Vout 6 6 R9 OA2 REF R5 Vcc 7 7 24K CM Out 8 8 CM IN CM OUT Table 1. 1200-series pin assignments Cb Gain Plastic DIP Plastic SO Part no. R6 , R9 R7 , R8 R1 , R3 R2 , R4 0 dB 1200P 1200S THAT1200 0 24 k 6k 6k 7k 17 k 6k THAT1203 6k -3 dB 1203P 1203S 7k 17 k 7k 5k THAT1206 -6 dB 1206P 1206S Figure 1. THAT1200-series equivalent circuit diagram Table 2. Ordering information Protected under U.S. Patent Numbers, 5,568,561 and 6,160,451. Additional patents pending. InGenius is a registered trademark of THAT Corporation. THAT Corporation 45 Sumner Street Milford, Massachusetts 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Web: www.thatcorp.com 600033 Rev 00Page 2 InGenius High-CMRR Balanced Input Line Receiver ICs 1 SPECIFICATIONS Absolute Maximum Ratings (T = 25C) A Positive Supply Voltage (V ) +20 V PDIP Pkg 86 C/W CC Ja Negative Supply Voltage (V ) -20 V EE SO Pkg 104 C/W Ja Storage Temperature Range (T ) -40 to +125C ST Operating Temperature Range (T ) 0 to +85C OP Output Short-Circuit Duration (t ) Continuous SH Junction Temperature (T ) 125C J THAT1200 THAT1203 THAT1206 Input Voltage (V ) 25 V 31 V 31 V IN 2,3,4 Electrical Characteristics Parameter Symbol Conditions Min Typ Max Units Supply Current I No signal 4.7 8.0 mA CC Supply Voltage V ,V 3 18 V CC EE Input Bias Current I No signal Either input 700 1,400 nA B connected to GND Input Offset Current I No signal 300 nA B-OFF Input Voltage Range V Common mode 12.5 13.0 V IN-CM V Differential (equal and opposite swing) IN-DIFF THAT 1200 21.0 21.5 dBu THAT 1203 24.0 24.5 dBu THAT 1206 24.0 24.5 dBu Input Impedance Z Differential 48.0 k IN-DIFF Z Common mode with bootstrap IN-CM 60 Hz 10.0 M 20 kHz 3.2 M Common Mode Rejection Ratio CMRR Matched source impedances V = 10V 1 CM DC 70 90 dB 60 Hz 70 90 dB 20 kHz 85 dB 5 Common Mode Rejection Ratio CMRR 10 unmatched source impedances V = 10V IEC CM DC 90 dB 60 Hz 90 dB 20 kHz 85 dB Common Mode Rejection Ratio CMRR 600 unmatched source impedances V = 10V 2 CM 60 Hz 70 dB 20 kHz 65 dB 6 Power Supply Rejection Ratio PSRR At 60 Hz, with V =-V CC EE THAT1200 82 dB THAT1203 80 dB THAT1206 80 dB 1. All specifications are subject to change without notice. 5. Per IEC Standard 60268-3 for testing CMRR of balanced 2. Unless otherwise noted, T =25C, V = +15V, V = -15V inputs. A CC EE 3. See test circuit in Figure 2. 6. Defined with respect to the differential gain. 4. 0 dBu = 0.775Vrms. THAT Corporation 45 Sumner Street Milford, Massachusetts 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Web: www.thatcorp.com