Datasheet

5
LTC1329-10/
LTC1329-50/LTC1329A-50
PIN FUNCTIONS
UUU
counter is configured in increment/decrement mode until
the power is cycled.
D
OUT
(Pin 8): Data Output. In 3-wire mode, on every
conversion D
OUT
serially outputs the previous 8-bit DAC
data. In pulse mode, D
OUT
is three-stated.
BLOCK DIAGRA
W
LATCH
AND
LOGIC
LATCH
AND
LOGIC
8-BIT
CURRENT
DAC
CLK
SHDN
CLK
1329 BD
D
IN
D
OUT
UP/DN
8-BIT DAC REGISTER/COUNTER
I
OUT
V
CC
D
OUT
8
8
8
9-BIT SHIFT REGISTER
VOLTAGE
REFERENCE
UP ONLY/
UP/DN
MODE SELECT
0 = PULSE
1 = 3-WIRE
POWER-ON
RESET
CONTROL
LOGIC
CLK
D
IN
(UP/DN)
CS
SHDN
SHDN
TEST CIRCUITS

Voltage Waveforms for t
DO
0.8V
0.4V
2.4V
1329 TC03
D
OUT
CLK
t
DO
Voltage Waveforms for t
DZ
, t
DV
1329 TC04
0.8V
CS
D
OUT

SET HIGH
D
OUT

SET LOW
2.4V
2.0V
90%
10%
0.4V
t
DV
t
DZ
HI-Z HI-Z
HI-Z HI-Z
3k
100pF
1329 TC01
1.4V
D
OUT
3k
100pF
1329 TC02
5V t
DZ
WAVEFORM 2, t
DV
t
DZ
WAVEFORM 1
D
OUT
Load Circuit for t
DO
Load Circuit for t
DZ,
t
DV