Article

Audio DSP Course (3)

In this instalment we present the DSP board. It is the platform for the applications that will be described in later instalments of this series, and it is also intended to enable you to develop your own initial digital audio signal processing applications, which we hope will be followed by many more. The DSP board can be used stand-alone as is, and even though it is an ideal learning platform, with its 24-bit signal processing capability for sampling rates up to 192 kHz and its high-performance interfaces, it is also suitable for applications with very stringent quality requirements for both signal to noise ratio and DSP computing power.

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Materials

110001-PCB.pdf

Component list

Resistors (SMD 0805)
R1–R6 = 100kOhm
R7,R9 = 470Ohm
R8,R10,R29,R30 = 220Ohm
R11,R12,R14,R34–R53,R57 = 10kOhm
R13,R24,R27 = 2.2kOhm
R15–R22 = 22Ohm
R23,R25,R26,R28 = 4.7kOhm
R31–R33 = 47kOhm
R54 = 75Ohm
R55 = 10Ohm
R56 = 1.5kOhm
R58 = 120Ohm

Capacitors
C1,C2 = 2.2µF, MKT, lead pitch 5mm or 7.5mm
C3,C4,C10,C13,C18,C22,C24,C34,C38,C40–C45,C47–C55,C57,C59,C62,C64,C66,C69,C72 = 100nF, ceramic (SMD 0805)
C5,C6 = 470pF, ceramic C0G/NP0 (SMD 0805)
C7,C8 = 4.7nF, ceramic, C0G/NP0 (SMD 0805)
C9,C12,C17,C21,C35,C36,C37,C39,C56,C58,C60,C61,C63,C65,C67 = 2.2µF 63V, radial, lead pitch 2mm
C11,C30–C33,C68,C71 = 100µF 25V, IAC = 190mA, radial, lead pitch 2.5mm
C14,C16,C19,C20,C23,C25 = 10nF, ceramic (SMD 0805)
C15 = 1µF, ceramic (SMD 0805)
C26,C27 = 3.3nF, ceramic, C0G/NP0 (SMD 0805)
C28,C29 = 820pF, ceramic, C0G/NP0 (SMD 0805)
C46 = 1nF, ceramic (SMD 0805)
C70,C73 = 1µF 100V, IAC = 30mA, radial, lead pitch 2mm
C74 = 220nF, ceramic (SMD 0805)
C75 = 470µF 16V, IAC = 1,4 A, radial, lead pitch 5mm

Inductors
L1,L2,L5,L6,L8 = 2700Ohm @100 MHz, 200mA, RDC = 0.8Ohm (SMD 0805)
L3 = 1500Ohm @ 100MHz, 200mA, RDC = 0.45Ohm (SMD 0805)
L4 = 10µH, 120mA, RDC = 0.5 Ohm (SMD 0805)
L7 = 330Ohm @100 MHz, 1.5 A, RDC = 0.09 Ohm (SMD 0805)

Semiconductors
D1,D2 = BAS70-04 (SOT-23)
D3 = LED, red, 3mm
D4 = BAT85
IC1,IC2 = OPA2353UA, Texas Instruments (SO-8)
IC3 = CS5340-CZZ, Cirrus Logic (TSSOP)
IC4 = PCM1781DBQ, Texas Instruments (SSOP)
IC5 = DSPB56374AE, Freescale Semiconductor (TQFP)
IC6 = M95M01-LEAD PITCHN6P, STMicroelectronics (SO-8)
IC7 = Quartz oscillator, SMD, 24.576 MHz, 7x5mm (IQD Frequency Products, CFPS-32IB 24.576MHZ)
IC8 = SRC4392IPFB, Texas Instruments (TQFP)
IC9 = GP1FAV31RK0F optical receiver, Sharp
IC10 = GP1FAV31TK0F optical transmitter, Sharp
IC11 = REG1117A-1.8, Texas Instruments (SOT-223)
IC12 = LM1085IT-3.3/NOPB, National Semiconductor
IC13 = LM317BTG, ON Semiconductor

Miscellaneous
K1–K4 = 2-pin pinheader, straight, lead pitch 2.54 mm
K5,K11 = 2-way PCB terminal Block, lead pitch 5 mm
K6,K8 = 14-pin pinheader (2x7), lead pitch 2.54 mm
K7,K10 = 10-pin pinheader (2x5), lead pitch 2.54 mm
K9 = 4-pin pinheader, straight, lead pitch 2.54 mm
K12 = 3-pin pinheader, straight, lead pitch 2.54 mm
JP1 = 3-pin pinheader, straight, lead pitch 2.54 mm, with jumper
Populated and tested board: Elektor order code 110001-91