AD569
REV. A
–12–
C949a–12–8/87
PRINTED IN U.S.A.
Preceding the second flash, the residue signal must be amplified
by a factor of 256. The OP37 provides a gain of 25.6 and the
AD630 provides another gain of 10. In this case, the AD630
acts as a gain element as well as a channel control switch. The
second flash conversion yields a 9-bit word. This provides one
extra bit of overlap for digital correction of any errors that oc-
curred in the first flash. The correction bit is digitally added to
the first flash before the entire 16-bit output is strobed into the
output register.
Figure 22. 16-Bit Subranging ADC
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Pin Ceramic DIP (D)
28-Pin Plastic DIP (N)
28-Pin Plastic Leaded Chip Carrier (P)
