adc1225ccd-1 National Semiconductor Corporation, adc1225ccd-1 Datasheet - Page 5

• Manufacturer Part Number: adc1225ccd-1
• Description: 12-bit Plus Sign Mp Compatible A/d Converters
• Manufacturer: National Semiconductor Corporation

AC Electrical Characteristics
Note 4 Two on-chip diodes are tied to each analog input as shown below
Errors in the A D conversion can occur if these diodes are forward biased more than 50 mV This means that if AV
minimum (
Note 5 A diode exists between analog V
To guarantee accuracy it is required that the AV
Note 6 A diode exists between analog ground and digital ground
To guarantee accuracy it is required that the analog ground and digital ground be connected together externally
Note 7 Accuracy is guaranteed at f
Note 8 Typicals are at 25 C and represent most likely parametric norm
Note 9 Tested and guaranteed to National’s AOQL (Average Outgoing Quality Level)
Note 10 Guaranteed but not 100% production tested These limits are not used to calculate outgoing quality levels
Note 11 Linearity error is defined as the deviation of the analog value expressed in LSBs from the straight line which passes through positive full scale and zero
after adjusting zero error (See Figures 1b and 1c )
Note 12 Human body model 100 pF discharged through a 1 5 kX resistor
b
4 75V
DC
) full-scale must be
CLK
e
CC
s
1 0 MHz At higher clock frequencies accuracy may degrade
4 8V
and digital V
DC
CC
and DV
FIGURE 1a Transfer Characteristic
C
CC
(Continued)
be connected together to a power supply with separate bypass filters at each V
5
TL H 5676 – 4
TL H 5676 – 20
CC
and DV
TL H 5676 – 21
CC
are minimum (4 75 V
CC
pin
DC
TL H 5676 – 8
) and V
b
is