SCOPE and Frequency meter Interface MODULE FCALLBOX

Description

This interface board is used by the universal measurement system FCALLBOX described here, but it can be used by another system, the functions are :

- Dual input stages for 50MHz scope, 8 ranges 160mV to 24V peak (20mV to 3V by division).

- One Frequency meter 200MHz max

- One Frequency meter 1.1GHz max (input divided by 8 with a MC12093).

Summary

• schematic

• BOM

• PCB

• Board cabling

Schematic

Download the schematic here

Bill of Material

Top view Ref Description Manufacturer / reference Price R1,R2 Resistor 47K 5% 0603 All brand ---- L1,R2 Feritte 600R 0603 All brand ---- R4,R18,R3 Resistor 1K 5% 0603 All brand ---- R5,R6 Resistor 100R 5% 0603 All brand ---- R7,R8,R9,R10,R11,R12,R13,R14 Resistor 10K 1% 0603 All brand ---- C11,C12 Capacitor 1uF 10V 10% 0603 All brand 2 x 0.03€ C1,C2,C3,C4,C5, Capacitor 100nF 50V 10% X5R 0603 All brand ---- C6,C7 Capacitor 1nF 50V 10% COG 0603 All brand ---- D1,D2,D3,D4 Diode STO23 BAS16 All brand 4 x 0.07€ U3,U4 IC TLV3501 comparator SOT23-6 Texas Instruments TLV3501AIDBVR 2 x 2.6€ U1 IC MC12093 prescaler by 2/4/8 1.1GHz OnSemi MC12093DR2G 1 x 4.5€ Q1 Mosfet N 2N7002 2N7002 All brand 1 x 0.15€ R19,R38 Resistor 10K 1% 0603 All brand ---- C42,C66 Capacitor 1uF 100V 10% X7R 1210 All brand 2 x 0.15€ R53,R54,R56,R57,R82,R85 Resistor 1.5K 5% 0603 All brand ---- R15,R83 Resistor 100KR 1% 0603 All brand ---- R16,R60 Resistor 820KR 1% 0603 All brand ---- R17,R84 Resistor 82KR 1% 0603 All brand ---- CV1,CV2,CV3,CV4 Capacitor ajustable 3-15pF 100V 10% X7R 1210 JR150 3-15pf Knowles 4 x 3.1€ C8,C9,C51,C67,C71 Capacitor 100pF 50 10% COG 0603 All brand ---- C18,C10 Capacitor 33pF 50 10% COG 0603 All brand ---- U14,U15 IC OPA653 500MHz SOT23-5 Texas Instruments OPA653IDBVT 2 x 7.3€ D5,D6,D7,D8 Diode schottky SDO323 BAS416 NXP 4 x 0.2€ C13,C15,C16,C17,C20,C21,C22,C23,C24,C25,C31,C34,C35,C36,C37 Capacitor 100nF 50V 10% X5R 0603 All brand 15 x 0.03€ U10,U11 IC LT1818 AOP 400MHz single SOT23-5 Analog Devices LT1818CS5#TRMPBF 2 x 2.2€ U12,U13 IC 74HCT4051D SOIC16 NXP 74HCT4051D 2 x 0.3€ U5,U6 IC PCF8574 I2C extender SSOP20 Texas Instruments PCF8574PWR 2 x 1.3€ R20,R50 Resistor 1.5K 1% 0603 All brand ---- R33,R47 Resistor 18K 1% 0603 All brand ---- C33,C49 Capacitor xxpF 50V 10% COG 0603 All brand R31,R46 Resistor 7.5K 1% 0603 All brand ---- R30,R45 Resistor 270R 1% 0603 All brand ---- C32,C48 Capacitor xxpF 50V 10% COG 0603 All brand ---- R29,R44 Resistor 3.3K 1% 0603 All brand ---- R28,R43 Resistor 560R 1% 0603 All brand ---- C30,C47 Capacitor 3.3pF 50V 10% COG 0603 All brand ---- R27,R42 Resistor 1.8K 1% 0603 All brand ---- R26,R41 Resistor 130R 1% 0603 All brand ---- C29,C46 Capacitor 3.3pF 50V 10% COG 0603 All brand ---- R32,R52 Resistor 8.2K 1% 0603 All brand ---- R21,R51 Resistor 390R 1% 0603 All brand ---- C28,C45 Capacitor xxpF 50V 10% COG 0603 All brand ---- R23,R37 Resistor 3.9K 1% 0603 All brand ---- R22,R36 Resistor 390R 1% 0603 All brand ---- C27,C44 Capacitor 3.3pF 50V 10% COG 0603 All brand ---- R25,R40 Resistor 2K 1% 0603 All brand ---- R24,R39 Resistor 130R 1% 0603 All brand ---- C26,C43 Capacitor 3.3pF 50V 10% COG 0603 All brand ---- R35,R49 Resistor 1.2K 1% 0603 All brand ---- R34,R48 Resistor 220R 1% 0603 All brand ---- C19,C41 Capacitor 3.3pF 50V 10% COG 0603 All brand ---- U16 IC LDO 3.3V 500mA SOT23-5 SPX3819M5-L-3-3 or MIC5504-3.3YM5-TR 1 x 0.4€ C39,C40 Capacitor 10uF 6.3V 10% X5R 0603 All brand 2 x 0.1€ C38 Capacitor 10nF 50V 10% X5R 0603 All brand ---- U2,U8,U9,U10,U22,U23 IC relay solid state IXYS CPC1017NTR 6 x 0.6€ C6,C7 Capacitor 1nF 50V 10% X5R 0603 All brand ---- C54,C55 Capacitor 330uF 10V 8x12 pitch 3.5mm NIPPON CHEMICON EKZH250ELL331MHB5D or equivalent 2 x 0.68€ L3,L4 Inductor 33uH 1.4A Wurht 744772330 or equivalent 2 x 0.84€ J1 Connector male 1x6 pitch 2.54mm All brand 1 x 0.5€ M1 PCB F00118-1 50x100mm 2 layers All brand 1 x 4€

Estimated cost in 2021 (Mouser) : around 55€ HT

PCB

The PCB F00118-1 is 50x100mm.

Download here the PCB manucfacturing files

Board assembly

Do not place the components in grey.

Top view

Download the top view assy (in png format)      
Download the top view assy (in pdf format, for component search location)     

Picture of the PCB

Two modifications are needed on the board, because the comparators of the frequencymeter stage tend to oscillate

at middle voltage when the frequency is low (10KHz for eg).

a 220KR between pin 3 and 5 of the TLV3501s must be soldered as shown on the pictures :

Modif 1

Modif 2

Board wiring

Connections with the FPGA Board and the face plate