Can i use this to convert a 720p hdmi to 1080i sdi?

Yes you can. Mini Converter UpDownCross HD has the ability to convert any SD or HD video format with up, down, or cross conversion via SDI and HDMI. See page 83 on Blackmagic Converters Manual. https://www.blackmagicdesign.com/manuals/Converters/Blackmagic_Converters_Manual.pdf

The output matches the monitor; which monitor? i will input a laptop hdmi out to 2 different switchers; 1 via hdmi 1 via sdi.

"Output supports EDID of the monitor". https://en.wikipedia.org/wiki/Extended_Display_Identification_Data This simply means that the converter does not output a fixed format via HDMI, rather it will communicate with the connected display to handshake on what resolution the monitor prefers. If your outputs are going direct to switchers and not to a display/TV, then this should not affect you and converter will simply output what you set it up to do.

Will this converter let me use my iphone camera or apple tablet camera into atem mini switcher?

Im not sure because the mini switcher allows you to switch video outputs during streaming. The UpDownCross use one signal and let you distribute that signal through the sdi out and hdmi out..

Does this device come with a power supply?

the one i ordered through here did

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Blackmagic Design Mini Converter UpDownCross HD CONVMUDCSTD/HD

Blackmagic Design Mini Converter UpDownCross HD CONVMUDCSTD/HD

Product ID: 743501037

Details

Brand
Blackmagic
Interface Type
HDMI SDI
Number of Channels
16
Number of Pins
43
UPC
818206535185

⚡Compact 247g powerhouse

📺Dual SDI + HDMI outputs

🔄Universal SD/HD format conversion

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$373.92

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Description

🎥 Convert Like a Pro, Anywhere, Anytime!

GLOBAL READY POWER - Includes 12V international AC adapter—stay powered and productive worldwide.
MULTI OUTPUT MASTERY - Simultaneously output via 2 SDI ports plus HDMI for ultimate monitoring and distribution.
LIGHTWEIGHT PORTABLE - At just 247 grams, take professional-grade conversion anywhere your projects demand.
PLUG PLAY SIMPLICITY - Intuitive setup with external reference input and monitor EDID support—no tech headaches.
SEAMLESS FORMAT FLEXIBILITY - Effortlessly convert any SD or HD video format to match your workflow needs.

The Blackmagic Design Mini Converter UpDownCross HD is a compact, versatile video format converter that supports SD, HD, and 3G-SDI inputs and outputs, including HDMI. Weighing only 247 grams and featuring dual SDI outputs plus HDMI output with monitor EDID support, it enables seamless up, down, and cross conversion of video formats. Perfect for professionals needing reliable, portable, and globally powered video conversion solutions.

Specifications

ASIN	B07C2QMH6W
Amazon Bestseller	#42,364 in Electronics ( See Top 100 in Electronics ) #54 in Digital-Analog Converters
Brand Name	Blackmagic Design
Compatible Devices	Monitor
Country Of Origin	Singapore
Customer Reviews	4.6 4.6 out of 5 stars (341)
Global Trade Identification Number	09338716005417
Included Components	AC adapter (12V international power supply that can be used around the world)
Interface	HDMI, SDI
Item Weight	247 Grams
Manufacturer	Blackmagic Design
Model	BM-CONVMUDCSTD/HD
Number of Channels	16
Number of Pins	43
Part Number	BM-CONVMUDCSTD/HD
UPC	818206535185
Unit Count	1 Count
Warranty Description	3

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