THAT Corporation Balanced Line Driver ICs THAT 1606, 1646 FEATURES APPLICATIONS Balanced, transformer-like floating Differential Line Drivers output Audio Mixing Consoles OutSmarts technology improves Distribution Amplifiers clipping into single-ended loads Hi-Fi Equipment Stable driving long cables and capacitive loads Audio Equalizers High output: 18Vrms into 600 Dynamic Range Processors Low noise: -101 dBu Digital Effects Processors Low distortion: 0.0007% 1kHz Telecommunications Systems Industry-standard pinout Instrumentation Description The THAT 1606 and 1646 are a new generation currents, making the designs inherently more stable of monolithic audio differential line drivers offering and less sensitive to component tolerances than improved performance over conventional cross-cou- common CCOSes. As a result, THAT s topology pre- pled designs. Based on a high-performance, fully dif- vents the loss of common-mode feedback that ferential opamp and laser-trimmed thin-film plagues common CCOS designs when clipping into resistors, both families exhibit low noise and distor- single-ended loads. This avoids excessive ground tion, high slew rate, and wide output swing. The currents that would otherwise upset power supplies parts are stable when driving difficult loads, and and create additional distortion, even in adjacent have short-circuit protected outputs. channels. Designed from the ground up in THAT s comple- The 1646 is pin-compatible with the TI DRV134 mentary dielectric isolation process, both models in- and DRV135, as well as the Analog Devices 1 corporate THAT s patented OutSmarts technology. SSM2142. The 1606 offers an advanced com- This is a dual feedback-loop design that prevents the mon-mode offset voltage reduction scheme, which re- excessive ground currents typical of cross-coupled quires a small single capacitor instead of the two output stages (CCOS) when clipping into sin- electrolytics required by the 1646 and its gle-ended loads. OutSmarts uses two individual neg- pin-compatible cousins. Additionally, the 1606 fea- ative-feedback loops to separately control the tures differential inputs in a space-saving 16-pin differential output voltage and common mode output QSOP package. Both parts offer +6 dB gain. 1646 1606 Pin DIP8 SO8 SO16W QSOP16 1 Out- Out- NC Gnd* THAT 1646 2 Sns- Sns- NC NC 10k 25 3 Gnd Gnd Out- Out- Vcc Out- 4In In Sns- Cap1 C EXT 5Vee Vee Gnd Gnd Sns- 10k 6 Vcc 5k Vcc In In- Din+ 10k 20k Dout- In+ 10p 7 Sns+ Sns+ NC In+ Cin+ 8 Out+ Out+ NC Gnd* AA& Cin- D C 5k 9 NC Gnd* Din- Dout+ Gnd 10k 20k 10 NC NC 10k Sns+ 11 Vee Vee C EXT 12 Vcc Vcc 10k 25 Vee Out+ 13 Sns+ Cap2 14 Out+ Out+ 15 NC NC 16 NC Gnd* * See Thermal Considerations section on page 10 Figure 1. THAT 1646 Equivalent Circuit Diagram Table 1. THAT 1606/1646 pin assignments 1. For complete details of OutSmarts, see Hebert, Gary K.,An Improved Balanced, Floating Output Driver I, presented at the 108th AES Convention, February 2000. Protected under US Patents numbers 4,979,218 and 6,316,970. Additional patents pending. THAT and OutSmarts are registered trademarks 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 Copyright 2011, THAT Corporation Document 600078 Rev. 05Document 600078 Rev 05 Page 2 of 12 THAT1606/1646 Balanced Line Driver ICs 2 SPECIFICATIONS Absolute Maximum Ratings (T = 25C) A Positive Supply Voltage (Vcc) +20 V Storage Temperature (T ) -55 to +125 C ST Negative Supply Voltage (Vee) -20 V Junction Temperature (T ) 125 C J Output Short Circuit Duration Continuous Lead Temperature (T )(Soldering 60 sec) 300 C LEAD Operating Temperature Range (T ) -40 to +85 C OP 3 1646 Electrical Characteristics Parameter Symbol Conditions Min. Typ. Max. Units Input Impedance Z 4.00 5.00 k IN Gain G1 R =100 k per output L Balanced 5.80 6.00 6.20 dB Single Ended 5.76 5.96 6.16 dB Gain G2 R = 600 L Balanced 5.00 5.30 5.60 dB Single Ended 4.96 5.26 5.56 dB Gain Error G1 R =100 k per output, Balanced 0.02 0.20 dB L DC Power Supply Rejection Ratio PSRR 4V to 18V 85 107 dB Output Common-Mode Rejection Ratio CMRR f=1kHz, BBC Method 46 65 dB OUT Output Signal Balance Ratio SBR f=1kHz, BBC Method 35 54 dB THD+N (Balanced) THD+N V =10 V ,R =600 1 O RMS L 20Hz-5kHz 0.0007 % 20kHz 0.002 0.005 % THD+N (Single Ended) THD+N V =10 V ,R =600 2 O RMS L 20Hz-5kHz 0.0010 % 20kHz 0.0030 0.0060 % Output Noise Onoise Balanced, 22Hz -20kHz -101 dBu Maximum Output Level Vo 0.1% THD+N 27.5 dBu MAX Slew Rate SR C =50pF/output 15 V/S L Small Signal Bandwidth C =50pF/output 10 MHz L Output Common Mode Voltage Offset V w/o Sense capacitors -250 50 250 mV OCM1 V w/ Sense capacitors -15 3.5 15 mV OCM2 Differential Output Offset V -15 4 15 mV OD Output Voltage Swing, Positive No Load V 2.9 V 2.2 V CC CC Output Voltage Swing, Negative No Load V +2.25 V +2.9 V EE EE Output Impedance Z 40 50 60 O 2. All specifications are subject to change without notice. 3. Unless otherwise noted,.all measurements taken with V =18V, T=25 C, R = 600 Balanced, R =0 S L SOURCE THAT Corporation 45 Sumner Street Milford, Massachusetts 01757-1656 USA Tel: +1 (508) 478-9200 Fax: +1 (508) 478-0990 Web: www.thatcorp.com Copyright 2011, THAT Corporation All rights reserved.