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AD5546BRU датащи(PDF) 7 Page - Analog Devices

номер детали AD5546BRU
подробное описание детали  Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
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AD5546/AD5556
Rev. 0 | Page 7 of 16
Pin No.
Mnemonic
Description
15
LDAC
Digital Input Load DAC Control. Signal level must be
≤ VDD + 0.3 V.
16
WR
Write Control Digital Input in Active Low. Transfers shift-register data to DAC register on rising edge. Signal level
must be
≤ VDD + 0.3 V.
17
MSB
Power On Reset State. MSB = 0 resets at zero-scale, MSB = 1 resets at midscale. Signal level must be
≤ VDD + 0.3 V.
18
RS
Reset in Active Low. Resets to zero-scale if MSB = 0 and resets to midscale if MSB = 1. Signal level must be
≤ VDD + 0.3 V.
19
GND
Analog and Digital Grounds.
20–27
D13 to D6
Digital Input Data Bits D13 to D6. Signal level must be
≤ VDD + 0.3 V.
28
VDD
Positive power supply input. Specified range of operation: 2.7 V to 5.5 V.
tWR
tDS
tDH
tLWD
tLDAC
tRS
WR
DATA
LDAC
RS
Figure 5. AD5546/AD5556 Timing Diagram
Table 5. AD5546 Parallel Input Data Format
MSB
LSB
Bit Position
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Data Word
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Table 6. AD5556 Parallel Input Data Format
MSB
LSB
Bit Position
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Data Word
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Table 7. Control Inputs
RS
WR
LDAC
Register Operation
0
X
X
Reset output to 0, with MSB pin = 0. Midscale with MSB pin = 1.
1
0
0
Load input register with data bits.
1
1
1
Load DAC register with the contents of the input register.
1
0
1
Input and DAC registers are transparent.
1
When LDAC and WR are tied together and programmed as a pulse, the data bits are loaded into the input register on
the falling edge of the pulse, and then loaded into the DAC register on the rising edge of the pulse.
1
1
0
No register operation.


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