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Focusrite ISA One and 430 MKII A/D Card

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The Focusrite ISA Stereo ADC Option is a 2-channel analog to digital converter card designed for used with Focusrite's ISA One or ISA 430 MKII microphone preamps. It is capable of capturing your audio in up to 24-bit, 192kHz resolution. Digital output formats include a 2-channel single/dual wire AES/EBU or 2-channel S/PDIF via 9-pin D-type, optical S/PDIF, and ADAT connectors. The stereo ADAT (TOSlink) port operates at 24-bit up to 96 kHz.

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About Focusrite ISA One and 430 MKII A/D Card


  • Stereo 24-bit / 192kHz AES/EBU, S/PDIF and ADAT ADC
  • Cutting-edge conversion technology
  • 2 channels of the highest quality 24-bit conversion at all sample rates up to 192kHzLoopback facility for routing audio between software applications via Saffire MixControl
  • Incredibly low jitter significantly improves sound quality


Output Formats AES/EBU (5 V / 110 Ω)
S/PDIF (0.8 V / 75 Ω) 
ADAT lightpipe (SMUX I/II/IV) 
S/PDIF lightpipe
Bit Depth 24-bits
Output Jitter AES3: < 500 ps, 50 Hz to 100 kHz, < 400 ps, 700 Hz to 100 kHz
Frequency Response All ranges: 20 Hz to 20 kHz ± 0.3 dB (50 Hz to 16 kHz ± 0.1 dB) 
176.4 kHz, 192 kHz : 16 Hz to 55 kHz ± 0.5 dB
THD + N -117.5 dB A-weighted, audio band-limited, 1 kHz, -60 dB FS input 
Maximum 0.004% at -1 dB FS (1 kHz)
Minimum 0.0008% at -13 dB FS (1 kHz)
Noise Idle Channel Noise: 113.5 dB at 44.1 kHz, CCIR-weighted, full bandwidth
Crosstalk -109 dB at 12 kHz
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