LTC1450 Linear Technology, LTC1450 Datasheet - Page 8

• Manufacturer Part Number: LTC1450
• Description: Parallel Input/ 12-Bit Rail-to-Rail Micropower DACs in SSOP
• Manufacturer: Linear Technology

LTC1450/LTC1450L
DIGITAL INTERFACE TRUTH TABLE
TIMING
BLOCK
8
W U
DIAGRAM
CLR
H
H
H
H
H
H
H
H
H
H
L
DIAGRAM
U
CSMSB
CSLSB
LDAC
DATA
CSMSB
WR
H
H
H
L
L
H
H
L
L
X
W
24
23
3
1
2
W
LDAC
CLR
CSMSB
WR
CSLSB
CSLSB
t
CWS
V
H
H
H
H
H
L
L
L
L
X
CC
20
POWER-ON
LTC1450: 2.048V
LTC1450L: 1.22V
RESET
REFERENCE
t
t
WR
t
CS
DWS
REFOUT
DATA VALID
19
WR
H
H
X
L
L
L
L
L
L
t
t
CWH
DWH
15
D11
(MSB) D10 D9 D8
INPUT LATCH
UPPER 4-BIT
LDAC
18
REFHI
H
H
H
H
H
H
L
L
X
14
DAC
13
17
REFLO
12-BIT DAC LATCH
12
FUNCTION
Loads the eight LSBs into the input latch
Latches the eight LSBs into the input latch
Latches the eight LSBs into the input latch
Loads the four MSBs into the input latch
Latches the four MSBs into the input latch
Latches the four MSBs into the input latch
Loads the input latch data into the DAC latch
Latches the input latch data into the DAC latch
Loads input data into DAC latches (latches transparent)
Latches input data into DAC latches
All zeros loaded into input and DAC latches
22
X1/X 2
t
t
D7
11
WR
CS
DATA VALID
D6
10
INPUT LATCH
LOWER 8-BIT
D5
9
–
+
D4
8
D3
7
D2
6
D1
5
DAC UPDATE
LTC1450/50L • BD
D0
(LSB)
4
V
t
GND
LDAC
OUT
LTC1450/50L • TD01
21
16