AD7846JP Analog Devices Inc, AD7846JP Datasheet - Page 17
AD7846JP
Manufacturer Part Number
AD7846JP
Description
IC DAC 16BIT LC2MOS VOUT 28PLCC
Manufacturer
Analog Devices Inc
Datasheet
1.AD7846JPZ.pdf
(24 pages)
Specifications of AD7846JP
Data Interface
Parallel
Rohs Status
RoHS non-compliant
Settling Time
7µs
Number Of Bits
16
Number Of Converters
1
Voltage Supply Source
Dual ±
Power Dissipation (max)
100mW
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-LCC (J-Lead)
Resolution (bits)
16bit
Sampling Rate
143kSPS
Input Channel Type
Parallel
Supply Voltage Range - Digital
4.75V To 5.25V
Supply Current
5mA
Digital Ic Case Style
LCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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DIGITAL FEEDTHROUGH
In the preceding interface configurations, most digital inputs to
the AD7846 are directly connected to the microprocessor bus.
Even when the device is not selected, these inputs are constantly
changing. The high frequency logic activity on the bus can feed
through the DAC package capacitance to show up as noise on
the analog output. To minimize this digital feedthrough, isolate
Figure 29. AD7846 Interface Circuit Using Latches to Minimize Digital Feedthrough
*LINEAR CIRCUITRY OMITTED FOR CLARITY
PROCESSOR
A1 TO A15
D0 TO D15
MICRO-
R/W
DATA BUS
ADDRESS BUS
ADDRESS
DECODE
Rev. G | Page 17 of 24
B BUS
DIR
74LS245
the DAC from the noise source. Figure 29 shows an interface
circuit that isolates the DAC from the bus.
Note that to make use of the AD7846 readback feature using
the isolation technique of Figure 29, the latch needs to be
bidirectional.
2×
A BUS
G
+5V
CLR
LDAC
DB0 TO DB15
CS
R/W
AD7846*
AD7846