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AD7801BRU Datasheet(PDF) 4 Page - Analog Devices

Part # AD7801BRU
Description  2.7 V to 5.5 V, Parallel Input, Voltage Output 8-Bit DAC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7801BRU Datasheet(HTML) 4 Page - Analog Devices

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AD7801
–4–
REV. 0
PIN FUNCTION DESCRIPTIONS
Pin
No.
Mnemonic
Function
1–8
D7–D0
Parallel Data Inputs. 8-bit data is loaded to the input register of the AD7801 under the control of
CS and WR.
9
CS
Chip Select. Active low logic input.
10
WR
Write Input.
WR is an active low logic input used in conjunction with CS to write data to the input register.
11
DGND
Digital Ground
12
PD
Active low input used to put the part into low power mode reducing current consumption to less than 1
µA.
13
LDAC
Load DAC Logic Input. When this logic input is taken low the DAC output is updated with the contents of
its DAC register. If
LDAC is permanently tied low the DAC is updated on the rising edge of WR.
14
CLR
Asynchronous Clear Input (Active Low). When this input is taken low the DAC register is loaded with all
zeroes and the DAC output is cleared to zero volts.
15
VDD
Power Supply Input. This part can be operated from +2.7 V to +5.5 V and should be decoupled to GND.
16
REFIN
External Reference Input. This can be used as the reference for the DAC. The range on this reference input is
1 V to VDD/2. If REFIN is tied directly to VDD the internal VDD/2 reference is selected.
17
AGND
Analog Ground reference point and return point for all analog current on the part.
18
NC
No Connect Pin.
19
VOUT
Analog Output Voltage from the DAC. The output amplifier can swing rail to rail on its output.
20
DGND
Digital Ground reference point and return point for all digital current on the part.
PIN CONFIGURATION
14
13
12
11
17
16
15
20
19
18
10
9
8
1
2
3
4
7
6
5
TOP VIEW
(Not to Scale)
AD7801
NC = NO CONNECT
(MSB) DB7
AGND
NC
VOUT
DGND
DB6
DB5
DB4
CLR
VDD
REFIN
DB3
DB2
DB1
(LSB) DB0
CS
WR
DGND
PD
LDAC


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