Summary of Contents for PI 2 Design 502HTA
- Page 1 PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 502HTA Hybrid Tube Amp Shield Hardware Reference Manual © 2017 PI 2 Design PAGE 1...
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Page 2: Table Of Contents
Figure 13 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -6dB, 600 ohm ..................27 Figure 14 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -12dB, 600 ohm .................. 28 Figure 15 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -60dB, 600 ohm (Generator set to 50mV rms) ........29 PAGE 2... -
Page 3: Warranty
This warranty is valid only for so long as the product is used intact as shipped from PI 2 Design. Any attempt or effort to alter the Product, including but not limited to any attempt to solder, de-solder, unplug, replace, add or affix any part or component of... -
Page 4: Operating Specifications
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 2 OPERATING SPECIFICATIONS 2.1 502HTA OPERATING SPECIFICATIONS The 502HTA conforms to the following specifications: Specification Value Dimensions 65mm x 56.5mm – Hat Compliant Weight ~8oz (with tube) Storage Temperature 0C to +70C... -
Page 5: Overview
• to adjust the output voltage to the optimal level for each Headphone. SINGLE POWER INPUT OPTION – A Single 24V @ 2A input powers the 502HTA and delivers 5V@3A to the Pi • via Low Pass Noise Filter. Power can also be isolated between the 502HTA and the Raspberry Pi for the lowest possible noise. -
Page 6: Figure 1 - 502Hta Block Diagram
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 24V @ 2A Power Brick WIDE INPUT SERIES/ 5V @ 3A 6.3V SWITCHING PARALLEL SUPPLY HEATER SEL Volume Control ANODE/ On/Off Switch CATHODE BIAS ADJ Backpower USB-A USB-A ULTRA-LOW Protection OUTPUT... -
Page 7: On-Board Functions
502HTA. 4.2 PCM5102A 24-BIT 192KHZ DAC At the core of the 502HTA is the Texas Instruments PCM5102A 24-Bit 192Khz DAC. This device interfaces to the Raspberry Pi via the I2S. The signals used to interface with the PCM5102A are shown in the following table. -
Page 8: Dual Triode Amplifer Notes
4. Although GPIO5 (MUTE) has a default pullup on the RPi of about 75K, which over-rides the 1Meg pulldown on the 502HTA, SW should drive this pin high. 5. Software should drive GPIO13 high to enable the Low Latency Filter if desired. -
Page 9: Heater Supply Notes
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 noise and overall power consumption. For the best experience, the user should start at the highest resistance and reduce only if the output levels are not satisfactory. 2. There is a 25 second delay from power up before the headphone output is enabled. -
Page 10: Rpi Gpio
5 RPI GPIO 5.1 OVERVIEW The 502HTA uses a number of signals from the RPi GPIO header for control and status purposes. This usage is defined in the following table. Note that on the 502HTA-SA the Raspberry Pi interface is not supported. -
Page 11: Rpi Gpio Notes
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 PUP/ 502HTA Description/Notes Name GPIO9 Unused GPIO25 Unused GPIO11 Unused GPIO8 Unused GPIO1 Unused ID_SDA Unused ID_SCL Unused *MUTE GPIO5, 0 = Mute PCM5102A Output FILT GPIO6, 1 = Enable PCM5102A Filter... -
Page 12: 502Hta Power
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 6 502HTA POWER 6.1 OVERVIEW The 502HTA is designed to be powered from an external 24V +/- 5% source via 5.5mm x 2.1mm Jack. 6.2 SOFTWARE CONTROLLED POWER HOLD GPIO22 allows the RPi to hold the power on even after the user turns the power switch to the off position. -
Page 13: Figure 2 - 502Hta Power Hold Circuit
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 2 – 502HTA Power Hold Circuit PAGE 13... -
Page 14: 502Hta Software
Hifiberry DAC. Using this driver will support all the audio functionality of the 502HTA, but will not enable the Power on/off control. The Volumio 2 Audio Player (www.volumio.org) supports the 502HTA by way of the 503HTA plugin. -
Page 15: Connectors And Switches
8 CONNECTORS AND SWITCHES 8.1 OVERVIEW This section provides the type, location and pinout for the various connectors and switches on the 502HTA Top Side. These are shown in the 3D rendering below. T1 – Dual Triode Tube 5.5mm x 2.1mm... - Page 16 This is a standard 40-Pin .1” Dual Row Female Header. It is designed to plug into the 40-pin GPIO Header on a Raspberry Pi single board and conforms to the standard Raspberry Pi pinout. It is located on the bottom side of the 502HTA. P2 is not populated on the 502HTA-SA.
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Page 17: Test Results
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 9 TEST RESULTS 9.1 TEST RESULTS SUMMARY 502HTA test conditions were: • Raspberry Pi 2 running Volumio Version 2.23, 503HTA driver selected • External 24V from low noise benchtop supply • Raspberry Pi powered from standard USB 5V@2.5A... -
Page 18: Figure 4 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, 0Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 4 – 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, 0dB, 600 ohm PAGE 18... -
Page 19: Figure 5 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -3Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 5 – 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -3dB, 600 ohm PAGE 19... -
Page 20: Figure 6 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -12Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 6 – 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -12dB, 600 ohm PAGE 20... -
Page 21: Figure 7 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -60Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 7 – 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -60dB, 600 ohm PAGE 21... -
Page 22: Figure 8 - 502Hta Headphone Out, 11.025Khz, 16-Bit@44.1Khz, Jitter Test, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 8 – 502HTA Headphone Out, 11.025Khz, 16-Bit@44.1Khz, Jitter Test, 600 ohm PAGE 22... -
Page 23: Figure 9 - 502Hta Headphone Out, 12Khz, 24-Bit@96Khz, Jitter Test, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 9 – 502HTA Headphone Out, 12Khz, 24-Bit@96Khz, Jitter Test, 600 ohm 9.3 HEADPHONE OUT, ANALOG LINE IN TEST RESULTS Using 1-meter RCA to RCA Cable and 1-meter 3.5MM to XLR Adapter cable. dScope... -
Page 24: Figure 10 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, 3Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 10 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, 3dB, 600 ohm PAGE 24... -
Page 25: Figure 11 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, 0Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 11 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, 0dB, 600 ohm PAGE 25... -
Page 26: Figure 12 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -3Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 12 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -3dB, 600 ohm PAGE 26... -
Page 27: Figure 13 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -6Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 13 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -6dB, 600 ohm PAGE 27... -
Page 28: Figure 14 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -12Db, 600 Ohm
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 14 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -12dB, 600 ohm PAGE 28... -
Page 29: Figure 15 - 502Hta Headphone Out, 1Khz, 24-Bit@96Khz, -60Db, 600 Ohm (Generator Set To 50Mv Rms)
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 Figure 15 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -60dB, 600 ohm (Generator set to 50mV rms) PAGE 29... -
Page 30: Document Revisions
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 10 DOCUMENT REVISIONS Date Revision Change 08/31/2017 P3 Preliminary Release Table 4 – Document Revisions PAGE 30... -
Page 31: Errata
PI2Media 502HTA Hardware Reference Manual – P3 - 8/31/2017 11 ERRATA 11.1 OVERVIEW There are currently no known errata for the 502HTA Rev. P3. PAGE 31...
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