LTC1657L Linear Technology Corporation, LTC1657L Datasheet - Page 8

• Manufacturer Part Number: LTC1657L
• Description: Ltc1657l - Parallel 16-bit Rail-to-rail Micropower Dac
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
DIGITAL INTERFACE TRUTH TABLE
LTC1657/LTC1657L
CLR (Pin 27): Clear Input (Asynchronous Active Low). A
low on this pin asynchronously resets all input and DAC
registers to 0s.
TIMING
8
W U
U
U
CLR
L
H
H
H
H
H
H
H
H
H
DIAGRAM
U
CSMSB
CSLSB
CSMSB
U
LDAC
DATA
WR
X
X
X
L
H
L
X
H
X
L
W
CSLSB
X
X
X
H
X
X
H
L
L
L
t
CWS
t
WR
t
WR
t
CS
X
X
X
H
X
X
DWS
L
L
L
L
DATA VALID
t
t
CWH
DWH
LDAC
X
H
X
X
X
X
X
X
L
L
FUNCTION
Clears input and DAC registers to zero
Loads DAC register with contents of input registers
Freezes contents of DAC register
Writes MSB byte into MSB input register
Writes LSB byte into LSB input register
Writes MSB and LSB bytes into MSB and LSB input registers
Inhibits write to MSB and LSB input registers
Inhibits write to MSB input register
Inhibits write to LSB input register
Data bus flows directly through input and DAC registers
LDAC (Pin 28): Load DAC (Asynchronous Active Low).
Used to asynchronously transfer the contents of the input
registers to the DAC register which updates the output
voltage. If held low, the DAC register loads data from the
input registers which will immediately update V
t
t
WR
CS
DATA VALID
DAC UPDATE
t
LDAC
1657 TD
OUT
.