DigitalaTo-Analog Converter. XR-9201 Datasheet

XR-9201 Converter. Datasheet pdf. Equivalent


EXAR XR-9201
XR-9201
8-Bit Microprocessor Compatible
DigitalaTo-Analog Converter
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAM
The XR-9201 is a monolithic 8-Bit ",p compatible digital-
to-analog converter with differential current outputs. It
contains an internal data latch, making it suitable for in-
terfacing with microprocessors. The chip contains a
stable voltage reference (2.0 V Nominal) which is exter-
nally adjustable and can be used as a reference for oth-
er D/A and AID converters.
The XR-9201 features non-linearity of ± V2 LSB maxi-
mum (± .19% of full scale current). The internal volt-
age reference maintains a temperature coefficient of
SO ppm/oC.
~Vee
V~H
TRIM
-VR" IN
.VR" IN
+Vee
DB7
DB6
DBS
DB4
10 DB3
FEATURES
8-Bit Resolution
Input Data Latches
Internal Voltage Reference
Microprocessor Compatible
Non Linearity
Fu" Scale Current Stability
Reference Voltage Stability
Differential Current Outputs
TIL Compatible
± V2 LSB Maximum
±SO ppm/oC
±SO ppm/oC
APPLICATIONS
Bipolar and UnipOlar D/A Conversion
AID Conversion
Test Equipment
Measuring Instruments
Programmable Current Source
Programmable Voltage Source
ABSOLUTE MAXIMUM RATINGS
+ VCC Positive Supply Voltage
- VCC Negative Supply Voltage
Logic Input Voltages
Power Dissipation
Derate Above 2SoC
Storage Temperature
+6V
-8.SV
o to +6V
SOO mW
S mW/oC
- SSoC to + 1S0°C
10
CE
GROUND
DB2
DBI
DBO
ORDERING INFORMATION
Part Number
XR-9201 CP
Package
Plastic
Operating Temperature
0° to +70°C
SYSTEM DESCRIPTION
To convert the output currents of the digital-to-analog
converter to a voltage, an operational amplifier can be
used as shown in Figure 12.
Care must be taken in selecting an operational amplifi-
er to be used in D/A conversion. For accurate conver-
sion, the operational amplifier should have low input
offset voltage, low input bias and offset currents, and
fast settling times. Input offset voltage contributes a
DC error on the output and should be properly nulled.
Input bias current contributes to the D/A converter cur-
rent flowing through the feedback resistor, RFB, and al-
so causes a DC error on the output voltage. This error
can be reduced by the addition of a resistor equal in
value to RFB from the noninverting input to ground.
Settling time is important because it rules how fast the
output reaches its prescribed voltage level. The OP-01
is suitable for D/A converter applications producing
negligible errors.
8-43


XR-9201 Datasheet
Recommendation XR-9201 Datasheet
Part XR-9201
Description 8-Bit Microprocessor Compatible DigitalaTo-Analog Converter
Feature XR-9201; XR-9201 8-Bit Microprocessor Compatible DigitalaTo-Analog Converter GENERAL DESCRIPTION FUNCTIONA.
Manufacture EXAR
Datasheet
Download XR-9201 Datasheet




EXAR XR-9201
XR·9201
ELECTRICAL CHARACTERISTICS
Test Conditions: VCC = +5V, - VCC = -7V, TA = 25°C, IREF = 1.0 mA, unless otherwise specified.
SYMBOL
PARAMETERS
Resolution
Monotonicity
Non-linearity
+VCC
-VCC
VIH
VIL
IIH
IlL
IFS
IZO
TCIFS
IFSS
VREF
Positive Supply
Voltage
Negative Supply
Voltage
Data Input and Chip Enable
"High" Voltage
Data Input and Chip Enable
"Low" Voltage
Data Input and Chip Enable
"High" Current
Data Input and Chip Enable
"Low" Current
Full Scale Output Current
Zero Scale Output Current
Full Scale Current
Temperature Sensitivity
Full Scale Symmetry
Internal Reference Voltage
TCREF
+ICC
-ICC
ts
tsu
tH
tw
tD
VREF Temperature Stability
Positive Supply Current
Negative Supply Current
Positive Output
Voltage Compliance
Negative Output
Voltage Compliance
Maximum Full Scale
Current
Settling Time
Data Set-up Time
Data Hold Time
Minimum Chip Enable (CE)
Pulse Width
Propagation Delay Time
MIN
8
.8
4,5
-7,7
2,0
1,914
2,005
-25
TYP
8
8
5,0
-7,0
1,992
±50
2,000
±50
15
-15
+5,0
-1,0
3
600
170
40
170
500
MAX
8
8
±0.5
±O,19
5,5
-6,3
0,8
500
±20
2,070
±10
±10
1,990
25
UNIT
Bits
Bits
LSB
%IFS
V
V
V
V
/-LA
/-LA
mA
/-LA
ppm/oC
/-LA
V
ppm/oC
mA
mA
V
V
mA
nsec
nsec
nsec
nsec
nsec
CONDITIONS
IREF = 1,000 mA
O°C ::s; TA ::s; 75°C
RADJ = 50 Kn
RADJ = 0 n
RADJ = 6 n
VREF = 2,00 V
8-44



EXAR XR-9201
XR·9201
+VREF IN 5 -....... -----+-c--..
-VREFIN • 1---1------4
Figure 2. Functional Block Diagram
I
I
I
I
I
I
I
i
I
I
:
:
___________________________________________________ .JI
85 81 eo CE
Figure 3A. Equivalent Circuit of Data Latches and Current Switches
8-45







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