to a limit of ~ 600 pF. (Best results, in terms of waveform linearity, will be obtained for
values of 0 - 300 pF).
Do not exceed 600 pF, or the switching transistors may become overstressed and
fail.
The design files for the sample daughterboard (Avtech PCB 267C) are available for
download at
https://www.avtechpulse.com/semiconductor/avrq-5/#support_files
.
The function of the various components is summarized below:
Reference
Footprint
Installed Value
Normally
Modified
by User
Typical Function
C1
1206
2.2uF,50V,X7R
No
VCC1 decoupling
C2
RAD5
33uF,50V
VCC2 decoupling
C3
0805
0.1uF
VCC2 decoupling
C4
0805
0.1uF
VCC1 decoupling
C5
0805
0.01uF
VCC1 decoupling
C7
0805
0.1uF
VCC1 decoupling
C8
1206
2.2uF,50V,X7R
VCC1 decoupling
U1
DP8A-SOCKET
DIP8 SOCKET
DUT socket
J1
SIP16A-WIDER
CONN16
Mates with ZIF socket
J2
SIP16A-WIDER
CONN16
Mates with ZIF socket
U2
SOT23-5
LP2985-50DBVR
Low-dropout 5V regulator VCC1
C6
0805
-
Yes
Load capacitance
R1
-
Zero-Ohm Jumper to connect DUT pin 1 to VCC1
R2
-
Output pullup
R3
-
Resistance to connect DUT pin 2 to VCC1.
Non-zero resistance for current-drive inputs.
R4
-
Zero-Ohm Jumper for DUT pin 7 as logic output
R5
-
Resistance to connect DUT pin 3 to VCC1
R6
-
Zero-Ohm Jumper for DUT pin 6 as logic output
R7
-
Resistance to connect DUT pin 4 to VCC1
R8
-
Zero-Ohm Jumper to connect DUT pin 1 to GND1
R9
-
Zero-Ohm Jumper to connect DUT pin 2 to GND1
R10
-
Zero-Ohm Jumper to connect DUT pin 3 to GND1
R11
-
Zero-Ohm Jumper to connect DUT pin 4 to GND1
P1
PAD-SM
-
Pads for rise time capacitor. Do not exceed 600 pF.
P2
BT1
KEYSTONE247
0
-
One user-installed A23-type 12V battery, prime power for
VCC1.(Please note that A23 batteries have a limited mA·hr
rating – typically 30 mA·hr when operating at 15 mA – so the
battery should be removed immediately after testing, and its
output should verified to be between 6V and 12V before each
test.)
37
Summary of Contents for AVRQ-5-B
Page 52: ...Bottom side 52 ...
Page 57: ...PCB 299B FOR ADUM241E0BRWZ 57 ...
Page 82: ...PCB 158R2 LOW VOLTAGE POWER SUPPLY ...
Page 87: ...DUT WIRING ON STANDARD DAUGHTERBOARD PCB 267C ...
Page 88: ...DUT WIRING ON CUSTOMIZED TLP2366 DAUGHTERBOARD PCB 298B ...
Page 89: ...DUT WIRING ON CUSTOMIZED ADUM241E0BRWZ DAUGHTERBOARD PCB 299B ...
Page 91: ...PERFORMANCE CHECK SHEET 91 ...