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Focusrite ISA-828 A-D Card
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      Focusrite ISA-828 A-D Card (180188)
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Cutting-edge 8-channel conversion for the Focusrite ISA 428 and ISA 828.

The ISA eight channel 192kHz A-D converter outperforms every other converter yet devised, and was the first audio A-D converter to utilise Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips. With cutting-edge conversion technology seated within Focusrite custom analogue circuitry, the card delivers unparalleled performance; specifications include a dynamic range of 122dB and jitter less than 250 picoseconds. More information about Focusrite's ISA A-D converters can be found on the right.

The card can be retrofitted to an ISA428, ISA428 MkII or ISA828 at any time and, thanks to its convenient 25-pin D-Type connector, integrates seamlessly with Pro Tools HD as well as other popular hard disk recorders and mixing desks.

All eight converters are always available with this option, even when using the ISA428 and ISA428 MkII. When installed in one of these four-channel mic preamps, the the extra 4 converters of the A-D card are fed by four XLR inputs on the back labeled "ADC Input".

Digital formats include an eight-channel single/dual wire AES/EBU and S/PDIF output, as well as an eight-channel ADAT lightpipe (SMUX/SMUX2) output. Word clock i/o is provided via dedicated BNC connectors.

ISA A-D Converters
Just paying for the PCB and circuitry, without any additional casing and metalwork, affords a considerable reduction in cost whilst maintaining an extremely high level of sonic clarity. However, the benefits from installing Focusrite’s optional ADC extend far beyond the obvious financial advantages and space saving issues. As most converters use the same chips, it is the quality of the surrounding analogue circuitry that makes the difference. This is the reason why the ISA ADC is unrivalled in terms of both price and performance.

Focusrite’s R and D team have carefully considered the organisation of the PCB layout and grounding, ensuring that the S/N ratio and linearity of the converter are optimised. The noise floor and THD (Total Harmonic Distortion) are kept to a minimum by the nature of the power supply and the analogue input design, with analogue filtering positively effecting the sound of the digital noise.

In addition, the supporting circuitry around the ADC (dealing with data transmission, bit reduction and incoming word clock) has been carefully structured, as it influences the converter through heat, power supply and data jitter. One of the most important aspects of the ADC is the clock design, as this determines the linearity of the digital output. All Focusrite ADCs are designed to have incredibly low jitter figures (44.1kHz-192kHz < 20 psec) which significantly improve the quality of the sound.

With the converters housed within the analogue units, the signal path is kept as short as possible, having no unnecessary analogue connections to the inputs of recording equipment. In addition, Focusrite units do not contain extraneous clocks or other sources of digital noise, unlike so many digital desks and multi-I/O DSP configurations.



Focusrite ISA-828 A-D Card Specifications:

  • Output formats (All channels)
    AES/EBU (5V / 110 ohms), S/PDIF (0.8V / 75 ohms)
    ADAT lightpipe (SMUX I/II/IV, channels 1-4 only in 176.4kHz, 192kHz mode)
    S/PDIF lightpipe (channels 1-4 only; mutually exclusive with ADAT lightpipe)

    Bit depth
    24 bits, internally configurable to 16 or 20 bits if necessary.

    AES3 output jitter
    <:1500ps, 50Hz-100kHz
    <:350ps, 700Hz-100kHz

    Frequency response
    All ranges: 20Hz–20kHz ± 0.3dB (100Hz–20kHz ± 0.1dB)
    176.4kHz, 192kHz : 17Hz–90kHz ± 0.5dB

    THD+n
    –121.5dB A-weighted, audio band-limited, 1kHz, -60dB FS input
    Maximum 0.0033% at –1dB FS (1kHz)
    Minimum 0.0008% at –15dB FS (1kHz)

    Idle channel noise
    117.5dB at 44.1kHz, CCIR-weighted, full bandwidth

    Crosstalk
    –100dB at 12kHz

    (paired channels)
    –95dB at 20kHz


Focusrite ISA-828 A-D Card

All Focusrite products are built to the highest standards and should provide reliable performance for many years, subject to reasonable care, use, transportation and storage.

In the event of a Manufacturing Defect becoming evident within 12 months from date of purchase Focusrite undertakes that the product will be repaired or replaced free of charge if the product is returned to the authorised dealer from whom it was purchased. In these circumstances, or if you need an out-of-warranty repair to your Focusrite product, please contact your local Focusrite distributor in your country of residence or business : Find your local distributor here and you will be advised of the correct return procedure.

Alternatively contact the Focusrite Reseller from which you purchased the product. If you purchase a Focusrite product outside your country of residence or business you will not be entitled to ask your local Focusrite Distributor to honour this Limited Warranty, although you may request a chargeable repair.

Alternatively, the unit may be returned at your cost to the dealer you purchased the unit from so that they can organise a Warranty repair with their Focusrite Distributor.

This Warranty does not include cost of shipping to and from the authorised dealer from whom it was purchased. In every case it will be necessary to provide the original invoice or store receipt to accompany the defective product to the supplying dealer. This Limited Warranty is offered solely to the first purchaser of the product from an Authorised Focusrite Reseller (defined as a reseller which has purchased the Product directly from Focusrite Audio Engineering Ltd. in the UK or its Authorised Distributors outside the U.K,) and is not transferable.

This Warranty is in addition to your Statutory Rights in the country of purchase.

Please note: A Manufacturing Defect is defined as a defect in the performance of the product which may be expected from a reasonable interpretation of the published description and performance specifications as published by Focusrite Audio Engineering Ltd. This does not include damage caused by post-purchase transportation, storage or careless handling, nor damage caused by misuse.

A significant proportion of products returned under Warranty (which are very few in number compared to numbers sold) are found not to exhibit any fault at all. Please check that the mains voltage is correctly set for your local supply and that your connecting cables are in good order and correctly connected.

If in doubt about the product functions please read the user guide and if necessary contact your dealer for advice before returning the product to the supplying dealer. You can also contact the Focusrite Tech Support team at the Focusrite Answerbase for general advice.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 1 reviews)
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  • Amazing A to D conversion for the price!

    As reviewed by L on 4/15/2011

    I own a 828 with the digital card. I run protools hd with a older 192 (not the new avid logo one). Although I do not always use my 828 pre's I do track everything thru the focusrite digital 828 digital card, always. I definitely get better clarity than using my 192 analog ins. If your looking for improvement in your sound. Most likely if you add one of these in your 428 or 828 you will notice a nice difference in quality

    1 of 1 people found this review helpful.
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