FOREX-US dollar tumbles in midst of consolidation; US data, ECB loom
* U.S. business activity rises in January * U.S. dollar still in midst of broad correction higher -analyst * Bank of Canada holds rate unchanged, focus shifts to rate cuts (Recasts, adds fresh comment, bullets, byline, NEW YORK dateline; updates prices) By Gertrude Chavez-Dreyfuss and Harry R...