Focusrite Audio Engineering ISA 8-Channel ADC for ISA 428 & ISA 828

The ISA eight channel 192kHz A-D converter outperforms 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 card delivers unparalleled performance; specifications include a dynamic range of 122dB and jitter less than 250 picoseconds.

The 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