Emi - Honeywell IS4921 Integration Manual

EMI

The IS4920 consists of a 400MHz processor running a 100MHz SDRAM bus and a camera interface capable
of image transfer up to 48MHz. The IS4920 series engine was designed to meet EN55022 Radiated Class B
emission limits. Using the system shown below, the decode engine was able to meet these requirements with
an input voltage VIN = 3.3V and the camera interface operating at its maximum frequency of 48MHz.
Part Number
IS4920-USB
77-77104A
77-77095A
52-52828
19-00329
Given the decoding platform architecture described above, the harmonics of 48MHz and 100MHz were most
prevalent.
48
Figure 41. IS4920 EMI Test System
Components used in IS4920 EMI test system
Part Description/Function
Imaging decode engine
Imager to Decode Flex cable assembly (shielded)
IS4920 test adapter board
USB cable (A to B)
12 pin Host Flex cable