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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Mini Converter UpDownCross HD | Converts and up/down/cross-converts SD and HD SDI formats with built-in format standards conversion (CONVMUDCSTD/HD)

Product ID: 70737398

Details

Brand
Blackmagic
Maximum Supply Voltage
36
Minimum Supply Voltage
6 volts
Mounting Type
Handmontage
Number of Pins
34

💻Cross-platform software upgrades

🔄Seamless SD/HD format conversion

🔌Universal 6-36V power input

1353.57 DT

Duties & taxes included

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Description

🔄 Convert Like a Pro, Stay Ahead of the Stream!

COMPACT YET ROBUST - Stainless steel build at just 247g, designed for professional hand-mounting setups.
PLUG PLAY VERSATILITY - Dual SDI and HDMI inputs/outputs plus reference input for flawless sync.
POWER ANYWHERE ANYTIME - Universal 12V power supply with global adapters and ultra-low 5W consumption.
FUTURE PROOF YOUR WORKFLOW - Internal software upgrades keep your converter cutting-edge across Mac & Windows.
EFFORTLESS VIDEO FORMAT MASTERY - Convert any SD or HD SDI format with precision using Teranex algorithms.

The Blackmagic Design Mini Converter UpDownCross HD is a compact, professional-grade video converter that effortlessly transforms SD and HD SDI formats with high-quality Teranex processing. Featuring versatile SDI and HDMI I/O, universal power compatibility, and seamless software upgrades across Mac and Windows, it’s engineered for flawless integration into any modern video workflow.

Specifications

ASIN	B07C2QMH6W
Best Sellers Rank	#48 in Digital-Analog Converters #115 in Video Converters
Brand Name	Blackmagic Design
Compatible Devices	Monitor
Customer Reviews	4.7 4.7 out of 5 stars (356)
Global Trade Identification Number	09338716005417
Interface	HDMI
Item Weight	247 g
Manufacturer	Blackmagic Design
Material Type	Stainless Steel
Maximum Supply Voltage	36 volts_of_direct_current
Minimum Supply Voltage	6 volts
Model	BM-CONVMUDCSTD/HD
Mounting Type	Handmontage
Number of Channels	16
Number of Items	1
Number of Pins	34
Part Number	BM-CONVMUDCSTD/HD
UPC	818206535185
Unit Count	1 Count
Warranty Description	2-Year Warranty

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