Focusrite ISA 428 & ISA 828 A/D Card

The Focusrite ISA eight channel 192kHz A-D converter out performs every other converter yet devised, and is 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 ISA 428/ 828 AD card delivers unparalleled performance; specifications include a dynamic range of 122dB and jitter less than 250 picoseconds.

The Focusrite ISA 428 & ISA 828 A/D card can be retrofitted to an ISA 428 or 828 at any time and, thanks to its convenient 25-pin D-Type connector, integrates seamlessly with ProTools HD as well as other popular hard disk recorders and mixing desks. 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.

• 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