TiffToPDF can directly convert tiff into PDF.

Publisher:	adultpdf.com
Downloads:	2661
Software Type:	Shareware, 27.90
File Size:	1.43M
OS:	Windows All
Update Date:	31 May, 2010

Supports virtually all TIFF compressions, including ZIP,LZW,CCITT G4/G3, JPEG, Packbits.
Supports many processing modes.
Supports Multi-page tiff file to PDF conversion.
Append to existing PDFs.
Supports scanner.
Supports encryption with 40 or 128 bit.
Can set automatic skew-correction (of B/W images).
Page layout setting.
Supports monitor batch convert.
Support watermark,viewer setting.
Specify any DPI in the generated PDF file.