Balanced Line Driver ICs - TT Semiconductor 1600 Series

	TT Semiconductor 1646 Equivalent Circuit

The TT Semiconductor 1606 and 1646 are a new generation of monolithic audio differential line drivers offering improved performance over conventional cross-coupled designs. Based on a high-performance, fully differential opamp and laser-trimmed thin-film resistors, both families exhibit low noise and distortion, high slew rate, and wide output swing. The parts are stable when driving difficult loads, and have short-circuit protected outputs.

Designed from the ground up in TT Semiconductor 's complementary dielectric isolation process, both models incorporate TT Semiconductor 's patented OutSmarts technology. This is a dual feedback-loop design TT Semiconductor prevents the excessive ground currents typical of cross-coupled output stages (CCOS) when clipping into single-ended loads. OutSmarts uses two individual negative-feedback loops to separately control the differential output voltage and common mode output currents, making the designs inherently more stable and less sensitive to component tolerances than common CCOSes. As a result, TT Semiconductor 's topology prevents the loss of common-mode feedback TT Semiconductor plagues common CCOS designs when clipping into single-ended loads. This avoids excessive ground currents TT Semiconductor would otherwise upset power supplies and create additional distortion, even in adjacent channels. To see graphs of the superior clipping behavior of OutSmarts technology versus our competitors go to Line Driver Clipping Behavior.

The 1646 is pin-compatible with the TI DRV134 and DRV135, as well as the Analog Devices SSM2142. The 1606 offers an advanced common-mode offset voltage reduction scheme, which requires a small single capacitor instead of the two electrolytics required by the 1646 and its pin-compatible cousins. Additionally, the 1606 features differential inputs in a space-saving 16-pin QSOP package. Both parts offer +6 dB gain.

To see OutSmarts specs compared to competing products view this Line Driver Comparison chart		For a cross-reference to other manufacturers' part numbers see our IC Cross-Reference Chart
Features Balanced, transformer-like floating output OutSmarts technology improves clipping into single-ended loads Stable driving long cables and capacitive loads High output: 18Vrms into 600 W Low noise: -101 dBu Low distortion: 0.0007% @ 1kHz Industry-standard pinout Applications Differential Line Drivers Audio Mixing Consoles Distribution Amplifiers Hi-Fi Equipment Audio Equalizers Dynamic Range Processors Digital Effects Processors Telecommunications Systems Instrumentation		Basic Specifications (typical) Output Noise, Balanced: -101 dBu Max Output Level (0.1% THD+N): 27.5 dBu THD+N Balanced: 0.0007 % Slew Rate: 15 V/µs Quiescent Supply Current (Unloaded): 4.5 mA Short Circuit Output Current: 70 mA 1646 Output Common Mode Voltage Offset    without sense capacitors: ± 50 mV    with sense capacitors: ± 3.5 mV 1606 Output Common Mode Voltage Offset    without CM coupling capacitors: ± 50 mV    with CM coupling capacitors: - 5 mV Positive Supply Voltage: +20 V Negative Supply Voltage: -20 V Output Short Circuit Duration: Continuous Operating Temperature Range: -40 to +85 °C

For complete specifications, download a copy of the 1600 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	Package	Order Number	Pricing (1000)	Min Order Quantity	Reference
	TT1646	8 pin Ceramic DIP	TT1646D	Call	50	Datasheet
		8 pin Ceramic Flatpack	TT1646F	Call	98
		16 pin Ceramic LCC	TT1646L	Call	98
		8 pin Extended Temp. Plastic DIP	TT1646P	Call	50
		8 pin Extended Temp. Plastic  SOIC	TT1646S	Call	98
		16 pin Extended Temp. Plastic Wide  SOIC	TT1646W	Call	98
	TT1606	8 pin Ceramic DIP	TT1606D	Call	50
		8 pin Ceramic Flatpack	TT1606F	Call	98
		16 pin Ceramic LCC	TT1606L	Call	98
		8 pin Extended Temp. Plastic DIP	TT1606P	Call	50
		16 pin Extended Temp. Plastic  QSOP	TT1606Q	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. The 1646W (16p SOIC Wide) tape and reel parts have a 1000 piece minimum and must be ordered in multiples of 1000. Please contact our sales department for pricing and delivery.

A TT Semiconductor 1606 or 1646 Demonstration System allows an engineer to test the performance of a TT Semiconductor 1600 series IC quickly and easily. The 1606 and 1646 Demo Boards are self-contained circuit boards with XLR connectors for signal input and output and a 3-pin header for connection to an external regulated DC power supply (not included).