LTC1662 Linear Technology, LTC1662 Datasheet - Page 5

• Manufacturer Part Number: LTC1662
• Description: Ultralow Power/ Dual 10-Bit DAC in MSOP
• Manufacturer: Linear Technology

OPERATIO
Table 1. DAC Control Functions
CS/LD
A3 A2 A1 A0
SCK
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D
IN
CONTROL
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
U
INPUT REGISTER
Load DACs A, B
(SCK ENABLED)
Load DAC A
Load DAC B
Load DAC A
Load DAC B
10-Bit Code
No Change
No Change
No Change
No Change
with Same
STATUS
A3
1
CONTROL CODE
A2
2
A1
3
DAC REGISTER
Update Outputs
Update Outputs
Update Outputs
Update Outputs
No Update
No Update
No Update
No Update
No Update
STATUS
A0
4
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Figure 1. Register Loading Sequence
D9
5
D8
6
POWER-DOWN STATUS
D7
7
(SLEEP/WAKE)
INPUT WORD W
No Change
No Change
No Change
D6
Wake
Wake
Wake
Wake
Sleep
Wake
8
INPUT CODE
D5
9
0
D4
10
D3
Contents of Input Regs. Outputs Update. Part Wakes Up
COMMENTS
No Operation. Power-Down Status Unchanged
(Part Stays In Wake or Sleep Mode)
Load Input Register A with Data. DAC Outputs
Unchanged. Power-Down Status Unchanged
Load Input Register B with Data. DAC Outputs
Unchanged. Power-Down Status Unchanged
Load Both DAC Regs with Existing Contents of Input
Regs. Outputs Update. Part Wakes Up
Load Input Reg A. Load DAC Regs with New Contents
of Input Reg A and Existing Contents of Reg B. Outputs
Update. Part Wakes Up
Load Input Reg B. Load DAC Regs with Existing Contents
of Input Reg A and New Contents of Reg B. Outputs
Update. Part Wakes Up
Part Wakes Up. Input and DAC Regs Unchanged. DAC
Outputs Reflect Existing Contents of DAC Regs
Part Goes to Sleep. Input and DAC Regs Unchanged. DAC
Outputs Set to High Impedance State
Load Both Input Regs. Load Both DAC Regs with New
11
D2
12
D1
13
D0
14
DON’T CARE
X1
15
X0
16
LTC1662
(INSTRUCTION
EXECUTED)
1662 F01
5