High-Performance Digital Preamplifier Controller IC THAT 5171 FEATURES APPLICATIONS Ideal mate for THAT1580 preamplifier Digitally controlled microphone preamplifiers Wide gain range: +13.6 to +68.6dB in 1dB steps, and Digitally-controlled instrumentation +5.6dB amplifiers Wide supply range: 5V to 17V Digitally-controlled differential Wide output swing: +27dBu (17V sup.) amplifiers Wide input swing: +22dBu (17V sup.) Audio mixing consoles Low THD+N: 0.0003% 22dB gain Integrated differential servo minimizes PC audio breakout boxes output offset Audio distribution systems Zero-crossing detector minimizes switching noise Digital audio snakes Flexible, addressable SPI interface Portable audio recorders Four general-purpose digital outputs Small 7mm x 7mm QFN32 package Description The THAT5171 is a digital gain controller for low- via this interface. The GPOs may be connected to noise, analog, differential, current-feedback audio input pads, analog switches, mute circuits, LEDs, preamplifiers such as the THAT 1580. When used in etc. The SPI bus supports read-back so that host conjunction with an appropriate analog gain block, software can verify proper operation. the 5171 can set gain to 5.6dB, or any gain from The 5171 was designed to mate perfectly with the 13.6dB to 68.6dB in 1dB steps, while preserving low THAT 1580 Differential Audio Preamplifier IC. noise and distortion. It operates from 5V to 17V Together, these two ICs provide a best-of-class supplies, supporting input signal levels as high as solution for digitally-controllable audio preamplifier +22 dBu (at 5.6dB gain, and 17V supplies) in applications. However, for designers who prefer a combination with the 1580 (without an external input more customized solution, the 5171 may also be pad). The 5171 includes a differential servo and zero- used to control a discrete preamplifier. crossing detector to minimize dc offsets and glitches Fabricated in a high-voltage CMOS process, the (zipper noise) during gain adjustments. 5171 integrates an astonishing amount of circuitry The 5171 is controlled via an addressable within a very small package. It comes in a small (7x7 serial-peripheral interface (SPI) port. Four General mm) 32-pin QFN package, making it suitable for Purpose Outputs (GPOs) can be controlled small portable devices. Figure 1. THAT 5171 Block Diagram 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 2019, THAT Corporation Document 600133 Rev 11 Document 600133 Rev 11 Page 2 of 20 THAT 5171 High-Performance Digital Preamplifier Controller IC Pin Pin Name Pin Description Number 1 NC No Connect 2 NC No Connect 3 RG1 Attenuator Network Output 1 Connects to preamplifier feedback 1 (RG1) 4 IN1 Attenuator Network Input 1 Connects to preamplifier Output 1 5 IN2 Attenuator Network Input 2 Connects to preamplifier Output 2 6 RG2 Attenuator Network Output 2 Connects to preamplifier feedback Input 2 (RG2) 7 NC No Connect 8 NC No Connect 9 VCC Positive Analog Supply Voltage 10 AGND Analog Ground Reference 11 VEE Negative Analog Supply Voltage 12 DGND Logic Ground Reference 13 VDD Logic Positive Supply Voltage 14 TRC R/C Timeout or External Clock Input 15 RST Reset Input (Active Low) 16 CS Chip Select Input (Active Low) 17 SCLK Serial Clock Input 18 DIN Serial Data Input 19 DOUT Serial Data Output 20 DGND Logic Ground Reference 21 VDD Logic Positive Power Supply 22 BSY Busy Output (Active High) 23 GPO0 During Reset: SPI address bit 0 input During run time: General Purpose Output 0 24 GPO1 During Reset: SPI address bit 1 input During run time: General Purpose Output 1 25 GPO2 During Reset: SPI address bit 2 input During run time: General Purpose Output 2 26 GPO3 General Purpose Output 3 27 NC No Connect 28 AGND Analog Ground Reference 29 SCAP1 DC Servo Capacitor Input 1 30 SCAP2 DC Servo Capacitor Input 2 31 SOUT1 DC Servo Output 1 32 SOUT2 DC Servo Output 2 Thermal Connected internally to Vee. Solder to PCB (optionally connect to Vee) for optimal PAD Pad performance. Table 1. Pin Assignments 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 2019, THAT Corporation All rights reserved.