B&B Electronics 2IQEC4, 2IQEC2 manual Transient Characteristics, Non-Quadrature Mode

Transient Characteristics

Quadrature Mode

Parameter	Symbol	Min.Value	Max. Value	Unit	Remarks
FCK High Pulse Width	t1	21	-	ns	-
FCK Low Pulse Width	t2	21	-	ns	-
FCK Frequency	fFCK	-	24	MHz	-
Mod-n Filter Clock (FCKn)Period	t3	42	-	ns	t3= (n+1) (t1+t2),
					where
					N=PSC=0 to FFH
FCKn Frequency	fFCKn	-	24	MHz	-
Quadrature Separation	t4	83	-	ns	t4≥ 2t3
Quadrature Clock Pulse Width	t5	167	-	ns	t5≥ 4t3
Quadrature Clock Frequency	fQA, fQB	-	3	MHz	fQA=fQB=1/8t3
Quadrature Clock to Count Delay	tQ1	5t3	6t3	-	-
X1/X2/X4 Count Clock Pulse Width	tQ2	42	-	ns	tQ2=t3
Index Input Pulse Width	tidx	125	-	ns	tidx≥ 3t3
Index Skew from A	tAi	-	42	ns	tAi≤ t3
Carry/Borrow/Compare Output Width	tQ3	42	-	ns	tQ3=t3

Non-Quadrature Mode

Parameter	Symbol	Min.Value	Max. Value	Unit	Remarks
Clock A – High Pulse Width	t6	16	-	ns	-
Clock A – Low Pulse Width	t7	16	-	ns	-
Direction Input B Set-up Time	t8S	20	-	ns	-
Direction Input B Hold Time	t8H	20	-	ns	-
Gate Input (ABG) Set-up Time	tGS	20	-	ns	-
Gate Input (ABG) Hold Time	tGH	20	-	ns	-
Clock Frequency (non-Mod-N)	fA	-	30	MHz	fA=(1/ (t6+t7))
Clock Frequency (Mod-N)	fAN	-	25	MHz	-
Clock to Carry or Borrow Out Delay	t9	-	30	ns	-
Carry or Borrow Out Pulse Width	t10	16	-	ns	t10=t7
Load CNTR, Reset CNTR and
Load OL Pulse Width	t11	20	-	ns	-
Clock to Compare Out Delay	t12	50	-	ns	-

B-2 Appendix B: Specifications 2IQEC2/43798 Manual

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