Audio Preamplifier Digital Controller IC THAT 5173 FEATURES APPLICATIONS Wide gain range: 0 to 60dB in 3dB steps Digitally controlled microphone preamplifiers Wide supply range: 5V to 17V Digitally controlled instrumentation Wide output swing: +27dBu (17V sup.) amplifiers Wide input swing: +27dBu (17V sup.) Digitally controlled differential Low THD+N: <0.001% 1kHz, amplifiers up to 42dB gain Integrated differential servo minimizes Audio mixing Consoles output offset PC audio breakout boxes Zero-crossing detector minimizes Audio distribution systems switching noise Daisy Chainable SPI interface Digital audio snakes Four general-purpose digital outputs Portable audio recorders Small 5mm x 5mm QFN24 package Description The THAT5173 is a digital gain controller for General Purpose Outputs (GPOs) can be controlled low-noise, analog, differential, current-feedback via this interface. The GPOs may be used to control audio preamplifiers such as the THAT 1580 and auxiliary functions such as input selectors, filters, 1583. When used in conjunction with an appropriate mutes, LEDs, relays, etc. analog gain block, the 5173 supports digitally The 5173 was designed to mate perfectly with the controlled gain from 0dB to 60dB in 3dB steps, while THAT 1580 and 1583 Differential Audio Preamplifier preserving low noise and distortion. It operates from ICs. Together, these combinations provide a high 5V to 17V analog supplies, supporting input performance solution for digitally-controllable audio signal levels as high as +27 dBu (at 0dB gain and preamplifier applications. However, the 5173 may 17V supplies) in combination with the 1580 or also be used to control a discrete preamplifier. 1583 -- without an input pad. The 5173 includes a Fabricated in a high-voltage CMOS process, the differential servo and zero-crossing detector to 5173 integrates an astonishing amount of circuitry minimize dc offsets and glitches (zipper noise) during within a very small package. It comes in a small (5x5 gain adjustments. mm) 24-pin QFN package, making it suitable for The 5173 is controlled via an industry standard small portable devices. serial-peripheral interface (SPI) port. Four Figure 1. THAT 5173 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 600166 Rev 05 D O U T D IN S C L K C S R S T G P O3 G P O2 T R C G P O1 BS Y G P O0 S O U T2 S O U T1 Vdd S C A P1 DGnd S C A P2 AGnd Rg2 IN2 Rg1 IN1THAT 5173 Page 2 of 20 Document 600166 Rev 05 Audio Preamplifier Digital Controller IC Pin Number Pin Name Pin Description 1 SCAP2 DC Servo Capacitor Input 2 2 RG1 Attenuator Network Output 1 Connects to preamplifier feedback 1 (RG1) 3 IN1 Attenuator Network Input 1 Connects to preamplifier Output 1 4 IN2 Attenuator Network Input 2 Connects to preamplifier Output 2 5 RG2 Attenuator Network Output 2 Connects to preamplifier feedback Input 2 (RG2) 6 RST Reset Input (Active Low) 7 CS Chip Select Input (Active Low) 8 SCLK Serial Clock Input 9 DIN Serial Data Input 10 TRC R/C Timeout or External Clock Input 11 VDD Logic Positive Power Supply 12 DGND Logic Ground Reference 13 DOUT Serial Data Output 14 BSY Busy Output (Active High) 15 GPO0 General Purpose Output 0 16 GPO1 General Purpose Output 1 17 GPO2 General Purpose Output 2 18 GPO3 General Purpose Output 3 19 VEE Negative Analog Supply Voltage 20 VCC Positive Analog Supply Voltage 21 AGND Analog Ground Reference 22 SOUT1 DC Servo Output 1 23 SOUT2 DC Servo Output 2 24 SCAP1 DC Servo Capacitor Input 1 Thermal Connected internally to V . Solder to PCB (optionally connect to V ) for optimal EE EE 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.