From 9df0db999de2f5493bd246bfd910ab68bc25d697 Mon Sep 17 00:00:00 2001 From: Liz Upton Date: Fri, 14 Oct 2022 16:04:10 +0100 Subject: [PATCH 1/3] Style and wording tweaks --- .../asciidoc/accessories/iqaudio/dac_pro.adoc | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc index 790fa3938..c3280c854 100644 --- a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc +++ b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc @@ -1,23 +1,23 @@ === Raspberry Pi DAC Pro -Our Raspberry Pi DAC Pro HAT is our highest-fidelity DAC (Digital to Analogue Converter). +The Raspberry Pi DAC Pro HAT is our highest-fidelity digital to analogue converter (DAC). image::images/DAC_Pro_Board_Diagram.jpg[width="80%"] -With the Texas Instruments PCM5242, the DAC Pro provides outstanding Signal to Noise Ratio -and supports Balanced/Differential out in parallel to Phono/RCA line level output. It also includes a -dedicated headphone amplifier. The DAC Pro is powered by Raspberry Pi through the GPIO header. +With the Texas Instruments PCM5242, the DAC Pro provides outstanding signal to noise ratio (SNR) +and supports balanced/differential output in parallel to phono/RCA line-level output. It also includes a +dedicated headphone amplifier. The DAC Pro is powered by a Raspberry Pi through the GPIO header. -A careful selection of components and the layout of tracks have been at the forefront of our design in order to ensure noise immunity and the best playback of audio. +The careful selection of components and considered layout of PCB tracks ensure noise immunity and the best playback of audio. -As part of the DAC Pro, two 3 pin headers (P7/P9) are exposed above the Raspberry Pi's USB and Ethernet ports for use by the optional XLR board that allows differential/balanced output. +As part of the DAC Pro, two three-pin headers (P7/P9) are exposed above the Raspberry Pi's USB and Ethernet ports for use by the optional XLR board, allowing differential/balanced output. ==== Pinouts [cols="1,12"] |=== -| *P1* | Analogue out (0..2V RMS), carries GPIO27, MUTE signal (headphone detect), Left and Right -Audio and Left and Right Ground. +| *P1* | Analogue out (0.2V RMS), carries GPIO27, MUTE signal (headphone detect), left and right +audio and left and right ground. | *P6* | Headphone socket signals (pin1: LEFT, 2:GROUND, 3: RIGHT, 4:GROUND, 5:DETECT). -| *P7/9* | Differential (0..4V RMS) output (P7:LEFT, P9: RIGHT). +| *P7/9* | Differential (0.4V RMS) output (P7:LEFT, P9: RIGHT). | *P10* | Alternative 5V input, powering Raspberry Pi in parallel. |=== From 266b522a086d6fa2b36a52e8f987b303709372c5 Mon Sep 17 00:00:00 2001 From: Liz Upton Date: Tue, 18 Oct 2022 16:00:07 +0100 Subject: [PATCH 2/3] Update dac_pro.adoc --- documentation/asciidoc/accessories/iqaudio/dac_pro.adoc | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc index c3280c854..2f258f175 100644 --- a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc +++ b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc @@ -4,18 +4,16 @@ The Raspberry Pi DAC Pro HAT is our highest-fidelity digital to analogue convert image::images/DAC_Pro_Board_Diagram.jpg[width="80%"] -With the Texas Instruments PCM5242, the DAC Pro provides outstanding signal to noise ratio (SNR) +With the Texas Instruments PCM5242, the DAC Pro provides outstanding signal-to-noise ratio (SNR) and supports balanced/differential output in parallel to phono/RCA line-level output. It also includes a dedicated headphone amplifier. The DAC Pro is powered by a Raspberry Pi through the GPIO header. -The careful selection of components and considered layout of PCB tracks ensure noise immunity and the best playback of audio. - As part of the DAC Pro, two three-pin headers (P7/P9) are exposed above the Raspberry Pi's USB and Ethernet ports for use by the optional XLR board, allowing differential/balanced output. ==== Pinouts [cols="1,12"] |=== -| *P1* | Analogue out (0.2V RMS), carries GPIO27, MUTE signal (headphone detect), left and right +| *P1* | Analogue out (0-2V RMS), carries GPIO27, MUTE signal (headphone detect), left and right audio and left and right ground. | *P6* | Headphone socket signals (pin1: LEFT, 2:GROUND, 3: RIGHT, 4:GROUND, 5:DETECT). | *P7/9* | Differential (0.4V RMS) output (P7:LEFT, P9: RIGHT). From 1817b807eb75a8aef66da82895e83d4ab5c8bf1c Mon Sep 17 00:00:00 2001 From: Liz Upton Date: Tue, 18 Oct 2022 16:03:06 +0100 Subject: [PATCH 3/3] Update dac_pro.adoc --- documentation/asciidoc/accessories/iqaudio/dac_pro.adoc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc index 2f258f175..cab1788b8 100644 --- a/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc +++ b/documentation/asciidoc/accessories/iqaudio/dac_pro.adoc @@ -15,7 +15,7 @@ As part of the DAC Pro, two three-pin headers (P7/P9) are exposed above the Rasp |=== | *P1* | Analogue out (0-2V RMS), carries GPIO27, MUTE signal (headphone detect), left and right audio and left and right ground. -| *P6* | Headphone socket signals (pin1: LEFT, 2:GROUND, 3: RIGHT, 4:GROUND, 5:DETECT). -| *P7/9* | Differential (0.4V RMS) output (P7:LEFT, P9: RIGHT). +| *P6* | Headphone socket signals (1: LEFT, 2: GROUND, 3: RIGHT, 4: GROUND, 5: DETECT). +| *P7/9* | Differential (0-4V RMS) output (P7: LEFT, P9: RIGHT). | *P10* | Alternative 5V input, powering Raspberry Pi in parallel. |===