ZN428E8 Просмотр технического описания (PDF) - Unspecified
Номер в каталоге
Компоненты Описание
производитель
ZN428E8 Datasheet PDF : 9 Pages
| |||
ZN428
ELECTRICAL CHARACTERISTICS (cont.)
Parameter
Min.
Logic (over specified operating
temperature range)
High level input voltage
2.0
Low level input voltage
-
High level input current
-
-
Low level input current
-
Input clamp diode voltage
-
Enable pulse width
100
Data set-up time
150
Data hold time
10
Note 4: Set up time before ENABLE goes high
Note 5: Hold time after ENABLE goes high
Typ.
-
-
-
-
-
-1.5
-
-
-
Max.
-
0.8
60
20
-5
-
-
-
-
Units
Conditions
V
V
µA
VIN = 5.5V, VCC = Max.
µA
VIN = 2.4V, VCC = Max.
µA
VIN = 0.4V, VCC = Max.
V
IIN = -8mA
ns
ns
Note 4
ns
Note 5
D-A CONVERTER
The converter is of the voltage switching type and uses
an R-2R ladder network as shown in Fig.3. Each 2R element
is connected to 0V or VREF IN by transistor voltage switches
specially designed for low offset voltage (<1mV). A binary
weighted voltage is produced at the output of the R-2R
ladder.
Fig.3 The R-2R ladder network
Analog
output
=
n
256
(VREF
IN
-
VOS)
+
VOS
where n is the digital input to the D-A from the data latch.
VOS is a small offset voltage produced by the D-A switch
currents flowing through the package lead resistance. The
value of VOS is typically 1mV. This offset will normally be
removed by the setting up procedure (see Operating Notes)
and because the offset temperature coefficient is low
(±6µV/°C)the effect on accuracy is negligible.
Share Link: 