AD7846JP Analog Devices Inc, AD7846JP Datasheet - Page 17

• Manufacturer Part Number: AD7846JP
• Description: IC DAC 16BIT LC2MOS VOUT 28PLCC
• Manufacturer: Analog Devices Inc

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

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