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PI2Media 502HTA

Hardware Reference Manual – P3 - 8/31/2017

PAGE 28

Figure 14 - 502HTA Headphone Out, 1Khz, 24-Bit@96Khz, -12dB, 600 ohm

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Summary of Contents for 502HTA

Page 1: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 1 502HTA Hybrid Tube Amp Shield Hardware Reference Manual 2017 PI 2 Design ...

Page 2: ...02HTA Power Hold Circuit 13 Figure 3 502HTA Connectors and Switches 15 Figure 4 502HTA Headphone Out 1Khz 24 Bit 96Khz 0dB 600 ohm 18 Figure 5 502HTA Headphone Out 1Khz 24 Bit 96Khz 3dB 600 ohm 19 Figure 6 502HTA Headphone Out 1Khz 24 Bit 96Khz 12dB 600 ohm 20 Figure 7 502HTA Headphone Out 1Khz 24 Bit 96Khz 60dB 600 ohm 21 Figure 8 502HTA Headphone Out 11 025Khz 16 Bit 44 1Khz Jitter Test 600 ohm ...

Page 3: ...ure humidity radiation atmosphere and voltage standard commercial environment 0C to 70C 60 RH Any Product that has been modified without the express prior written consent of Pi 2 Design is not covered by this warranty The use or connection of any test or bus Connector adapter or component with any device other than a Pi 2 Design Connector or adapter shall void this warranty and the warranty of all...

Page 4: ...A conforms to the following specifications Specification Value Dimensions 65mm x 56 5mm Hat Compliant Weight 8oz with tube Storage Temperature 0C to 70C Operating Temperature 0C to 50C Humidity 0 to 95 RH Non Condensing Input Voltage VIN 24V 5 500ma Peak Power Consumption 8W Typical 10W Maximum Table 1 502HTA Operating Specifications ...

Page 5: ...t the I2S Stream to drive the Single Triode Tube Stage at 24 Bit up to 192Khz Frame Rate TUBE ROLLING The 502HTA supports both 6DJ8 default is JJ 6DJ8 and 12AU7 type tubes Individual Anode Bias Adjustment Pots plus selectable Series Parallel Heater Configuration insure the perfect setup for virtually any tube HEADPHONE OUT Rugged 3 5mm Jack plus selectable output resistance between 1 5 47 and 100 ...

Page 6: ... LEFT LOW JITTER PLL Raspberry Pi w 40 PIN GPIO Header HW CONTROL DUAL TRIODE IRL510 LM317A IRL510 LM317A WIDE INPUT 6 3V SWITCHING SUPPLY 24V 2A Power Brick Backpower Protection Circuit 5V 3A LDO 40 Pin Socket 5V GPIO I2S OUTPUT RESISTOR SELECT OUTPUT RESISTOR SELECT SERIES PARALLEL HEATER SEL 3 5MM Headphone Jack 3 5MM Stereo Input Jack ANODE CATHODE BIAS ADJ DUAL TRIODE GAIN SWITCH VOLUME CONTR...

Page 7: ...l Audio Data from Pi DEMP GPIO13 Pulled High to Enable De Emphasis Drive Low to Disable FILT GPIO6 Pulled High to Enable Digital Filter Drive Low to Disable MUTE GPIO5 Pulled Low to Mute Drive High to Enable Table 2 RPi to PCM5102A Connections 4 2 1 PCM5102A 24 BIT 192KHZ DAC NOTES 1 The PCM5102A is not populated on the 502HTA SA 2 The 502HTA is designed for the Raspberry Pi to operate in master m...

Page 8: ... at 100 4 3 1 DUAL TRIODE AMPLIFER NOTES 1 There is an attenuation switch which when enabled up position reduces the input to the Amp by 10dB thus reducing overall maximum gain to 0dB The actual gain is set by the tube and it s cathode resistor It may vary as much as 1dB 2 The Amp is driven from either the PCM5120A DAC or when a plug is inserted the 3 5mm Line In jack 3 An ALPS 10K Dual Potentiome...

Page 9: ...output is disabled immediately when power is removed 4 5 6 3V HEATER SUPPLY A low noise high performance switching supply provides the 6 3V for the Tube Heaters This supply also feeds the 5V LDO used to power the RPi up to 3A 4 5 1 6 3V HEATER SUPPLY NOTES 1 A 3 Pin Jumper is used to select how the power to the Tube Heater is fed In 6V mode a jumper is placed on pins 2 3 while in 12V mode a jumper...

Page 10: ... 502HTA Name Description Notes 1 RPi 3 3V Unused 2 5V 5V Power to from the RPi 3 I O Y PUP I2C_SDA I2C Bus Data unused 4 5V 5V Power to from the RPi 5 OUT Y PUP I2C_SCL I2C Bus Clock Unused 6 GND 7 GPIO4 Unused 8 GPIO14 Unused 9 GND Unused 10 GPIO15 Unused 11 GPIO17 Unused 12 IN Y BCLK I2S Bit Clock to pCM5102A 13 GPIO27 Unused 14 GND 15 Out GPIO22 Power Hold Drive high to keep power on 16 GPIO23 ...

Page 11: ... only 34 GND 35 OUT Y LRCLK I2S Left Right Clock to PCM5102A 36 GPIO16 Unused 37 GPIO26 Unused 38 GPIO20 Unused 39 GND 40 OUT Y SDOUT Pi I2S Serial Audio Data to PCM5102A Table 3 CPU GPIO Pin Assignments 5 1 1 RPI GPIO NOTES 1 DIR is from the point of view of the RPi 2 Y in the Alternate Function AF column indicates that the use of this pin requires the pin to be assigned to the function as define...

Page 12: ...f switch Driving this low removes this hold condition Note that for proper operation this requires user software to disable the internal pullup for GPIO22 6 3 SOFTWARE VISIBLE POWER STATE The 502HTA allows the RPi to keep the system powered for clean shutdown As part of this PWR_SW GPIO24 is used to sense the state of the ALPS Volume Control Switch When high it indicates that the user has turned t...

Page 13: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 13 Figure 2 502HTA Power Hold Circuit ...

Page 14: ...heir proper sequencing are beyond the scope of this document See our web site at http www pi2design com or email us at support pi2design com for example operating and initialization code 7 2 DRIVER SOFTWARE COMPATIBILITY The 502HTA is compatible with the standard Raspberry Pi PCM5102A driver An example is the Hifiberry DAC Using this driver will support all the audio functionality of the 502HTA bu...

Page 15: ... on the 502HTA Top Side These are shown in the 3D rendering below Figure 3 502HTA Connectors and Switches 8 2 J1 3 5MM HEADPHONE JACK J1 is a 3 5mm Stereo Jack for Headphone Out 8 3 J2 3 5MM HEADPHONE JACK J2 is a 3 5mm Stereo Jack for Line In T1 Dual Triode Tube P2 5 5mm x 2 1mm DC JACK J1 3 5MM Headphone RP5 Volume Control Power Switch SW1 SW2 Attenuation J2 3 5MM Line In RP3 RP1 W2 R G L ...

Page 16: ... HEATER VOLTAGE SELECT P3 is a 3 pin 1 single row header It is used to select between 6V or 12V in series mode tube heaters 8 8 RP1 AND RP3 TRIMPOTS RP1 and RP3 are the bias adjustment potentiometers for the Left and Right Channels respectively 8 9 RP5 VOLUME POT WITH ON OFF SWITCH RP5 is an Alps RK09 Low Noise Conductive Plastic Volume Control with built in On Off Switch 8 10 SW1 ATTENUATION SWIT...

Page 17: ...cope IIIe Analog In Load resistance 600 ohm dScope IIIe Analyzer FFT 32K THD w no weighting Residual Noise w A Weighting 502HTA SA test conditions were External 24V from low noise benchtop supply All Test Files were encoded as 24 Bit 96Khz unless otherwise noted 0db reference 2Vrms dScope IIIe Analog Generator set to 2Vrms Out Floating Ground dScope IIIe Analog In Load resistance 600 ohm dScope II...

Page 18: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 18 Figure 4 502HTA Headphone Out 1Khz 24 Bit 96Khz 0dB 600 ohm ...

Page 19: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 19 Figure 5 502HTA Headphone Out 1Khz 24 Bit 96Khz 3dB 600 ohm ...

Page 20: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 20 Figure 6 502HTA Headphone Out 1Khz 24 Bit 96Khz 12dB 600 ohm ...

Page 21: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 21 Figure 7 502HTA Headphone Out 1Khz 24 Bit 96Khz 60dB 600 ohm ...

Page 22: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 22 Figure 8 502HTA Headphone Out 11 025Khz 16 Bit 44 1Khz Jitter Test 600 ohm ...

Page 23: ...phone 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 IIIe generator set to 1Vrms unless otherwise noted Attenuation Switch Low Volume adjusted to desired output level ...

Page 24: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 24 Figure 10 502HTA Headphone Out 1Khz 24 Bit 96Khz 3dB 600 ohm ...

Page 25: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 25 Figure 11 502HTA Headphone Out 1Khz 24 Bit 96Khz 0dB 600 ohm ...

Page 26: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 26 Figure 12 502HTA Headphone Out 1Khz 24 Bit 96Khz 3dB 600 ohm ...

Page 27: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 27 Figure 13 502HTA Headphone Out 1Khz 24 Bit 96Khz 6dB 600 ohm ...

Page 28: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 28 Figure 14 502HTA Headphone Out 1Khz 24 Bit 96Khz 12dB 600 ohm ...

Page 29: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 29 Figure 15 502HTA Headphone Out 1Khz 24 Bit 96Khz 60dB 600 ohm Generator set to 50mV rms ...

Page 30: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 30 10 DOCUMENT REVISIONS Date Revision Change 08 31 2017 P3 Preliminary Release Table 4 Document Revisions ...

Page 31: ...PI2Media 502HTA Hardware Reference Manual P3 8 31 2017 PAGE 31 11 ERRATA 11 1 OVERVIEW There are currently no known errata for the 502HTA Rev P3 ...

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