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10 MHz Reference Generator

Highly Accurate, With Distributor and Galvanic Isolation

10 MHz Reference Generator
10 MHz Reference Generator
If frequencies and/or times have to be recorded in complex measurement setups and the results have to be related to each other accurately and, above all, precisely, in terms of time, these measuring devices should run virtually synchronously. For this purpose, they are coupled with the aid of a highly accurate reference frequency. This article describes how to build such a reference generator.
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Materials

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Bill of Materials

Component List

Resistors

SMD 0603, unless otherwise specified

R1, R3, R9, R53, R309, R314, R315 = 10k

R2, R310 = 4k7

R4 = 820 Ω

R5 = 0 Ω, SMD 2012 *

R6, R7 = 1k2

R8, R14, R52, R64, R75, R86, R97, R108, R123 = 390 Ω

R10, R17 = 100 Ω

R11, R18, R54, R57, R58, R61, R63, R66, R69, R72, R74, R77, R80, R83, R85, R88, R91, R94, R96, R99, R102, R105, R107, R110, R115, R118, R121, R124, R126, R129, R130 = 50 Ω

R13, R67, R68, R78, R79, R89, R90, R100, R101, R111, R112, R113, R114, R119, R120, R307, R308, R318 = 0 Ω *

R15 = 130 Ω

R16 = 2k5, multi-turn trim pot, vertical, RM 1/10″

R25 = 1k

R50 = 120 Ω

R51 = 200 Ω, multi-turn trim pot, vertical, RM 1/10″

R55, R56, R60, R65, R71, R76, R82, R87, R93, R98, R104, R109, R116, R117, R122, R127 = 470 Ω

R59, R70, R81, R92, R103, R128 = 330 Ω

R62, R73, R84, R95, R106, R125 = 500 Ω, multi-turn trim pot, vertical, RM 1/10″

R301, R306 = 150 Ω

R302, R305 = see text

R303, R304 = 75 Ω

R311…R313 = 10 Ω, SMD 2012

R316 = 68 Ω

R317 = 180 Ω

 

Capacitors

SMD 0603, unless otherwise specified

C1 = 4,700 µ / 16 V, electrolytic, RM 5 mm, ⌀ 13 mm *

C2, C4, C8…C11, C19…C22, C34, C35, C51…C54, C56…C65, C82, C83 = 100n

C3, C5, C12…C18, C33, C36…C40 = 22 µ / 20 V, SMD SMCB

C6, C7 = 2,200 µ / 16 V, electrolytic, RM 5 mm, ⌀ 13 mm

C23, C32 = 33p

C24 = 120p

C25, C90 = 5p6

C26 = 10p

C27 = 150p

C28, C31 = 100p

C29 = 12p

C30 = 39p

C66, C68, C70, C72, C74, C76, C78, C87 = 47p

C67, C69, C71, C73, C75, C77, C79, C88 = 3p3

C81, C89, C94 = 10n

C84…C86, C91…C93 = 1n

 

Inductors

All SMD 1210

L1…L7, L301 = 4µ7

L8 = 1µ8

L9 = 1µ5

 

Semiconductors

D1…D4 = SK56, Schottky, 60 V / 5 A, DO214AA *

D5…D8 = SK56, Schottky, 60 V / 5 A, DO214AA

D9, D10 = SK540, Schottky, 40 V / 5 A, DO214AC

D31 = 1N4148, SOD-123

LED1…LED3 = LED, SMD 0805

T1…T2 = 2N3904, SOT23-BEC

IC1 = 7805

IC2 = 7905

IC3 = LT1963AET-3.3 *

IC4…IC11 = MAX4392ESA, SOIC8

IC6 = MCP1525TT, SOT-23-3 *

U1 = AD8368ACPZ-WP, LFCSP-24 *

U2 = SN74LVC1G80DBVR, SOT-23-5 *

Y1 = AOCJY-20.000MHZ-F, SMD *

XO1 = XO91, 20 MHz, SMD *

 

Miscellaneous

X1 = 2-pin screw terminal, RM 5 mm

X5 = 3-pin screw terminal, RM 5 mm

JP1, JP2 = 2-pin header

Tr1 = transformer 2 × 6 V, 2 × 300 mA, RM 20 mm, PCB mounting *

Tr3 = transformer 2 × 6 V, 2 × 233 mA, RM 27.5 mm, PCB mounting

Tr51…TR81 = ADT1-1, RF transformer, SMD *

F1 = fuse 250 mA, 20 × 5 mm

Fuse holder for F1, PCB mounting

K1 = relay FTR-B4S, SMD

 

* See text

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