THAT5171 Digital Preamplifier Controller Demonstration System THAT 5171-DEMO FEATURES Demonstrates a complete digitally-controlled microphone preamplifier system utilizing the THAT5171 controller IC paired with a THAT1580 preamplifier IC Balanced microphone-level audio inputs on XLR connector with switchable phantom power via external 48V supply Balanced line input with -20dB pad on TRS connector Balanced audio output on XLR and TRS connectors Supports pro audio signal levels: +22 dBu input and +22 dBu output Easy to use PC Graphical User Interface software provides control of gain, GPO states, and Zero Crossing Detector modes Gain (measured input to output) is adjustable in 1 dB steps: 0 dB, and 8 - 63dB Direct SPI control and multiple board daisy-chaining is available via on-board headers External VCM input available for output stage biasing On-board prototyping area Figure 1. THAT 5171 Demo Board 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 2018, THAT Corporation All rights reserved. Document 600189 Rev 01 THAT 5171-DEMO Datasheet Page 2 of 14 Document 600189 Rev 01 THAT5171/1580 Overview phantom power switch, signal routing switches, LEDs, The THAT5171 and THAT1580 ICs enable digitally- etc. The 5171s addressable SPI interface supports read- controlled microphone preamplifier applications with back. By separating the analog mic preamp front end exceptionally high performance. The chipset accepts pro (THAT1580) from the digital functions and switched audio input levels (+22 dBu max) without an input pad. resistor ladder (THAT5171), each IC is optimized for Gain is adjustable to 5.6 dB, and 13.6 dB to 68.6 dB in high performance. 1 dB increments (a 5.6 dB attenuator at the output The THAT1580 is fabricated using THATs high- offsets the overall gain range to 0 dB, and 8-63 dB). The voltage BiCMOS process, yielding extremely high 5171s built-in zero-crossing detector and other performance. The THAT5171 is fabricated using a high- techniques for reducing zipper noise enable very smooth voltage CMOS process, with proprietary techniques for and silent gain changes. A differential servo reduces reducing FET switching glitches. Packaged in 4x4 mm output offsets to less than 1.5 mV. Four general QFN16 and 7x7 mm QFN32 packages respectively, the purpose outputs on the 5171 can be connected to a THAT1580 and THAT5171 require very little PCB area. variety of peripheral functions, e.g. an input pad, Block Diagram CHAS +48V +15V GND -15V +5V Power Supply Inputs +3.3V +5V REG Reset Switch THAT Vcc 5171 USB + - USB Servo Interface + Resistor - Control Network Logic Vee with FET MUX Switches Ext SPI Bus SPI Conn Balanced Mic/Line THAT Output Input 1580 or 1583 Balanced Phantom Output RFI RFI Power Driver Protection Fault Protection Protection OUTPUT SECTION INPUT SECTION Figure 2. Block Diagram of the THAT 5171 Demo Board 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 2018, THAT Corporation All rights reserved. DOUT DIN SCLK CS DGnd RST GPO3 TRC GPO2 LEDs GPO1 BSY GPO0 SOUT2 Vcc SOUT1 SCAP1 Vdd SCAP2 AGnd Rg2 IN2 Rg1 IN1 Vee