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B-2 Appendix B: Specifications 2IQEC2/43798 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
Transient Characteristics
Quadrature Mode
Parameter Symbol Min.Value Max. Value Unit Remarks
FCK High Pulse Width t1 21 - ns -
FCK Low Pulse Width t
2 21 - ns -
FCK Frequency f
FCK -24MHz-
Mod-n Filter Clock (FCKn)Period t
3 42 - ns t3= (n+1) (t1+t2),
where
N=PSC=0 to FF
H
FCKn Frequency fFCKn -24MHz-
Quadrature Separation t
4 83 - ns t4≥2t3
Quadrature Clock Pulse Width t5 167 - ns t5≥4t3
Quadrature Clock Frequency fQA,fQB -3 MHzfQA=fQB=1/8t3
Quadrature Clock to Count Delay tQ1 5t3 6t3 --
X1/X2/X4 Count Clock Pulse Width t
Q2 42 - ns tQ2=t3
Index Input Pulse Width tidx 125 - ns tidx≥3t3
Index Skew from A tAi -42nstAi≤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 t
7 16 - ns -
Direction Input B Set-up Time t
8S 20 - ns -
Direction Input B Hold Time t
8H 20 - ns -
Gate Input (ABG) Set-up Time t
GS 20 - ns -
Gate Input (ABG) Hold Time t
GH 20 - ns -
Clock Frequency (non-Mod-N) f
A -30MHzfA=(1/ (t6+t7))
Clock Frequency (Mod-N) f
AN -25MHz-
Clock to Carry or Borrow Out Delay t
9 -30ns-
Carry or Borrow Out Pulse Width t
10 16 - ns t10=t7
Load CNTR, Reset CNTR and
Load OL Pulse Width t
11 20 - ns -
Clock to Compare Out Delay t
12 50 - ns -