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DDS Function Generator

DDS Function Generator
DDS chips are readily available, greatly simplifying the design of the analog part of a wide-range function- or signal generator. All you need to do (they say!) is choose one, add some suitable output circuitry, pick a microcontroller, provide a user interface and start programming. To which we reply: sweet dreams, here is the real story.
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Products
Relevant websites
Extra info, Update
Specifications Direct Digital Synthesis (DDS) with analog front-end Frequency range: 1 – 10 MHz Frequency resolution: 0.28 Hz Output: 0 – 15 Vpp THD+N (100 kOhm load, B > 500 kHz): 1 V, 1 kHz: 0.12% (0.09% for B = 22 kHz) 5 V, 1 kHz: 0.1% (0.09% for B = 22 kHz) 1 V, 10 kHz: 0.1% (0.09% for B = 80 kHz) 5 V, 10 kHz: 0.09% (0.08% for B = 80 kHz) 1 V, 100 kHz: 0.1% 5 V, 100 kHz: 0.08% S/N (referred to 1 V): 72 dB Maximum output (10 MOhm load): Sine: 16 Vpp Triangle: 16 Vpp Square: 18 Vpp DC offset voltage range: –10 to +10 V Output impedance: 50 Ohm Duty cycle (square wave): 1 – 99% Rise and fall time (80%, square wave): 100 ns Sweep mode Power consumption: 3 VA Visit www.elektor-labs.com/150210 for more figures and plots.
Components
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Component List
Generator Board
Resistors
All 1%, 0.125 W, SMD 0805
R1 = 220Ohm, 1%, 0.75W, SMD 2010
R2,R22,R23,R37 = 1kOhm
R3 = 1kOhm, 1%, 0.1W, SMD 0603
R5,R6,R7,R8,R9,R10,R11,R12,R30,R31,R36 = 10kOhm
R13 = 6.8kOhm
R14, R15 = 200Ohm
R16, R19, R25 = 910Ohm
R17, R20 = 1.2kOhm
R18, R26 = 2.0kOhm
R21, R24 = 499kOhm
R27 = 220Ohm
R28 = 10Ohm
R29 = 10kOhm, 1%, 0.1W, SMD 0603
R32, R33 = 100Ohm, 1%, 0.75W, SMD 2010
P1 = 10kOhm, 2W, 10-turn potentiometer
P2 = 1kOhm, 2W, 10-turn potentiometer
Capacitors
Default: SMD 0603
C1,C3,C4,C12,C13,C14,C16,C17,C19,C20,C26,C27,C28,C29,C31 = 100nF, 50V, X7R
C2, C5 = 10µF, 16V, X7R, SMD 1206
C6, C7 = 470nF, 25V, X7R
C11 = 1µF, 16V, X7R, SMD 1206
C15 = 10nF, 50V, X7R
C18 = 10pF, 50V, C0G/NP0
C21 = 100pF, 100V, C0G/NP0, SMD 0805
C22, C23 = 220µF, 25V, radial, 3.5mm pitch, diam. 8mm max.
C24, C30 = 100nF, 50V, X7R, SMD 0805
Semiconductors
IC1 = ADUC7024BSTZ62, LQFP-64, programmed*
IC2 = AD8032ARZ, SOIC-8
IC3 = AD9834BRUZ, TSSOP-20
IC4 = FXO-HC736R-75, 7 x 5 mm
IC5, IC6 = AD8042ARZ, SOIC-8
IC7 = ADG779BKSG-REEL7, 6-Lead SC-70
IC8 = AD811ANZ, DIP-8
IC9 = OP1177ARZ, SOIC-8
IC10, IC11 = ADR1581ARTZ-REEL7, SOT-23-3
Other
K1 = Socket, 0.5 mm, 1.5 mm stack, 10-way, DF23C-10DS-0.5V(51), Hirose (HRS)
K2, JP1, JP2 = 1x2 pin header, vertical, 0.1’’ pitch
K3 = 2x3 pin header, vertical, 0.1’’ pitch
K4 = 1x4 pin header, vertical, 0.1’’ pitch
K5 = BNC 50 Ohm, Straight Bulkhead Jack, Panel mount
S1-S8 = 6 mm tactile switch, actuator length 4.9mm, 24V/0.05A, SPST-NO
8-way DIP socket for IC8,
Graphic B/W replacement LCD for Nokia 6100
Miscellaneous
Aluminum enclosure, Hammond type 1455T1601, 165 x 160 x 51.5mm
Optional: EMI/EMC filter, inlet, IEC, 250VAC / 4A
2 knobs, black, 16mm, 0.25 in. shaft diam.
PCB 150210-1 v1.11 (www.elektor.com)
* Not available ready programmed from www.elektor.com
Component List
Power Supply
Resistors (1%, 0.6 W)
R1, R3 = 180Ohm
R2, R4 = 2.0kOhm
R5 = 240Ohm
R6 = 390Ohm
R7 = 10kOhm, 5%, 0.25W
Capacitors
C1,C2,C3,C4,C15,C16 = 10nF 50V, Y5V, 0.2’’ pitch
C5 = 1000µF 50V, 5 or 7.5 mm pitch, 16mm diam.
C6 = 470µF 50V, 5 or 7.5mm pitch, 13mm diam.
C7,C8,C13,C14,C18,C21 = 100nF 50V, X7R, 0.2’’ pitch
C9,C10,C11,C12,C19,C20 = 10µF 50V, 2mm pitch, 6.3mm diam. max.
C17 = 47µF 50V, 2.5mm or 3.5mm pitch, 8mm diam. max.
Semiconductors
D1,D2 = STPS2L60, DO-41 case
D3,D4,D5,D6 = 1N4007, DO-41 case
IC1,IC3 = LM317, TO-220 case
IC2 = LM337, TO-220 case
LED1 = LED, green, 3mm
Miscellaneous
K1 = 2-way PCB screw terminal block, 0.3’’ pitch, 500V
K2 = 4-way (2x2) PCB screw terminal block, 0.2’’ pitch, 250V
TR1 = 2x115V prim./2x15V sec., 10VA, e.g. Block FL 10/15
F1 = fuse, 100 mA (230 VAC line) or 200mA (115 VAC line); slow blow, 250V, 20 x 5mm
F2, F3 = fuse, 315mA, slow blow, 250V, 20x5mm
Fuse holder for F1, F2, F3, 20 x 5mm, 500V, 10A
Covers for F1, F2, F3 fuse holders, 20 x 5mm
JP1 = Jumper wire
PCB 150210-2 v1.1 (www.elektor.com)

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