• on Audio/Video/Photography
  • Published in issue 3/2001 on page 0
About the article

Audio ADC 2001

24-bit, 96 kHz sampling

Audio ADC 2001
It is barely four years since we presented our 20-bit A/D Converter as the newest of the new. However, development continues at a rapid pace. At the present moment, 24-bit, 96-kHz sampling is the standard. It’s thus high time for a successor that is completely up to date!Anyone who is a bit familiar with the subject will immediately see that the A/D converter described here is almost the twin of the 20-bit design of four years ago. The only difference is that the resolution and speed have been increased by the use of more recent components, so that the present design is fully state of the art. This circuit can thus be regarded as a sort of ‘Mark II’ version of the previous circuit.Once again, an integrated A/D converter made by Crystal, the CS5396, occupies the central position in the design. This successor to the ‘old’ CS5390 converter, which was used in the previous design, has been specially developed for 24-bit A/D conversion of stereo audio signals with sampling rates up to 100 kHz.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Converter board
R1,R7 = 1M Ohm
R2,R3,R8,R9 = 10k Ohm 0
R4,R10 = 4k Ohm 7
R5,R6,R11,R12 = 39 Ohm 2
R13,R16 = 4 Ohm 7
R14 = 120k Ohm
R15 = 100 Ohm
R17 = 8k Ohm 2
R18 = 270 Ohm
R19 = 75 Ohm
R20 = 10k Ohm , 8-way SIL array
R21 = 10 Ohm
C1,C2,C3,C7,C8,C9 = 3µF3 MKT, lead pitch 5 or 7.5mm
C4,C10,C44,C46,C48 = 470µF 16V radial
C5,C11,C13-C20,C32,C35,C37,C38,C39,C41,C43,C45,C47,C49 = 100nF ceramic
C6,C12 = 6nF8 1% polystyrene/polypropylene (EMZ)
C21,C23 = 100µF 25V radial
C22,C24,C26,C27,C29,C34 = 100nF SMD (case size 0805)
C25,C28 = 10nF SMD (case size 0805)
C30,C40,C42 = 10µF 63V radial
C31 = 1µF 63V radial
C33,C50 = 47µF 25V radial
C36 = 47nF MKT
L1,L2 = 10µH
L3,L4,L5 = 47µH
D1-D9 = BAT85
D10,D11 = 5V6 1W3 zener diode
IC1...IC4 = OPA627AP (Burr-Brown = Texas Instruments)
IC5 = CS5396-KS (Crystal) (Atlantik Elektronik)
IC6 = CS8404A (Crystal) (Atlantik Elektronik)
IC7 = TOTX173 Toshiba (Conrad Electronics)
IC8 = 24.576MHz oscillator block, type SG531P (Seiko Epson)
IC9 = 74HC74
IC10 = 74HC14
IC11 = 7805
JP1 = 3-way pinheader + jumper
K1,K2,K7 = T-709G (Monacor/Monarch)
K3,K4 = 3-way pinheader
K5,K6 = 10-way boxheader, male (straight)
S1 = 8-way DIP switch
S2 = pushbutton, 1 make contact
Tr1 = ferrite ring core Philips TN13/7,5/5-3E25, primary: 20 turns, secondary: 2 turns 0,5 mm dia. (26SWG) enamelled copper wire
Power Supply Board
R1,R2 = 2 Ohm 2
R3 = 2k Ohm 2
C1,C2,C5,C6,C13,C15 = 100nF ceramic
C3,C4,C14 = 10µF 63V radial
C7,C8 = 1000µF 25V radial
C9-C12,C17-C20 = 47nF ceramic
C16 = 470µF 25V radial
D1 = high-efficiency-LED, red
IC1 = 7812 + heatsink type ICK35SA (Fischer, Dau Components)
IC2 = 7912
IC3 = 7805 heatsink type ICK35SA (Fischer, Dau Components)
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