You can download the source code of this example here: pdfdocscout_using_tiff.zip 

This example shows how to convert TIFF image into PDF document with PDFDoc Scout library using free PDFDoc Scout Image addon that comes along with PDFDoc Scout.

Code to convert TIFF image into PDF:

' this example uses PDFDoc Scout Image Addon to load PNG into PDF document

Set PDFDoc = CreateObject("PDFDocScout.PDFDocument")
Set ImageLdr = CreateObject ("PDFDocScoutImgAddon.ImageLoader")

PDFDoc.InitLibrary "demo", "demo"
PDFDoc.OutputFilename = "png_sample.pdf"
PDFDoc.AutoOpenGeneratedPDF = true

PDFDoc.BeginDocument

ImageLdr.ConnectToPDFLibrary (PDFDoc)
Image = ImageLdr.AddImageFromFileNameEx ("sample.png", 1) ' 1 = ictJPEG type image compression, we store image as JPEG inside PDF

ImageLdr.DisconnectFromPDFLibrary

PDFDoc.Page.PlaceImage Image, 10,10 ' place image to current page at (10,10)

PDFDoc.EndDocument ' close PDF document generation

' disconnect from library
Set PDFDoc = Nothing

You can download the source code of this example here: pdfdocscout_using_tiff.zip 

You can read information about TIFF file to get number of pages in multi-paged TIFF image files when you need to know how much pages are in TIFF:

' this example shows how to read number of available frames in TIFF images using PDFDoc Scout Image Addon

Set ImageLdr = CreateObject ("PDFDocScoutImgAddon.ImageLoader")

Count = ImageLdr.GetImagePagesCount("ab.tif")

MsgBox CStr(Count) & " frames in tiff image ", vbOKOnly

Download this small example: pdfdocscout_get_frames_count_in_tiff.zip