Balanced Line Driver ICs THAT 1280, 1283, 1286 and 1260 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 Audio Equalizers capacitive loads 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 mode output currents, making the designs of monolithic audio differential line drivers offering inherently more stable and less sensitive to improved performance over conventional cross- component tolerances than common CCOSes. As a coupled designs. Based on a high-performance, fully result, THAT s topology prevents the loss of differential opamp and laser-trimmed thin-film common-mode feedback that plagues common resistors, both families exhibit low noise and CCOS designs when clipping into single-ended loads. distortion, high slew rate, and wide output swing. This avoids excessive ground currents that would The parts are stable when driving difficult loads, and otherwise upset power supplies and create have short-circuit protected outputs. additional distortion, even in adjacent channels. Designed from the ground up in THAT s The 1646 is pin-compatible with the TI DRV134 complementary dielectric isolation process, both and DRV135, as well as the Analog Devices 1 models incorporate THAT s patented OutSmarts SSM2142. The 1606 offers an advanced common- technology. This is a dual feedback-loop design that mode offset voltage reduction scheme, which requires a small single capacitor instead of the two prevents the excessive ground currents typical of electrolytics required by the 1646 and its pin- cross-coupled output stages (CCOS) when clipping compatible cousins. Additionally, the 1606 features into single-ended loads. OutSmarts uses two differential inputs in a space-saving 16-pin QSOP individual negative-feedback loops to separately package. Both parts offer +6 dB gain. control the differential output voltage and common 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- C 4 In In Sns- Cap1 EXT Sns- 5 Vee Vee Gnd Gnd 10k 5k 6 Vcc Vcc In In- Din+ 10k 20k Dout- In+ 10p Cin+ 7 Sns+ Sns+ NC In+ 8 Out+ Out+ NC Gnd* Cin- 5k 9 NC Gnd* Din- Gnd Dout+ 10k 20k 10 NC NC 10k 11 Vee Vee Sns+ C EXT 12 Vcc Vcc 10k 25 Vee Out+ 13 Sns+ Cap2 14 Out+ Out+ 15 NC NC 16 NC Gnd* * SeeThermal Consideration 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, MA 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Web: www.thatcorp.com Copyright 2013, THAT Corporation Document 600078 Rev. 06 Document 600078 Rev. 06 Page 2 of 12 THAT 1606/1646 Balanced Line Driver ICs 2 SPECIFICATIONS Absolute Maximum Ratings (T = 25C) A Postive Supply Voltage (V ) +20 V Storage Temperature (T ) -55 to +125C CC ST Negative Supply Voltage (V ) -20 V Junction Temperature (T ) 125C EE J Output Short Circuit Duration Continuous Lead Temperature (T )(Soldering 60 sec) 300C LEAD Operating Temperature Range (T ) -40 to +85C 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 0.0090 % 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 V2.9 V2.2 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=25C, R = 600 Balanced, R = 0 S L SOURCE THAT Corporation 45 Sumner Street Milford, MA 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Web: www.thatcorp.com Copyright 2013, THAT Corporation All rights reserved.