LTC1428-50 Linear Technology, LTC1428-50 Datasheet - Page 5

• Manufacturer Part Number: LTC1428-50
• Description: Micropower 8-Bit Current Sink Output D/A Converter
• Manufacturer: Linear Technology

BLOCK DIAGRA
TEST CIRCUITS
D
CLK
OUT
SHDN
POWER-ON
CLK
D
CS
RESET
Voltage Waveforms for t
IN
0.8V
Load Circuit for t
D
OUT
W
t
DO
1.4V
1428-50 TC01
3k
DO
100pF
CONTROL
DO
LATCH
LATCH
LOGIC
LOGIC
LOGIC
AND
AND
1428-50 TC03
UP ONLY/
UP/DN
MODE SELECT
0 = PULSE
1 = SPI
2.4V
0.4V
REFERENCE
VOLTAGE
SHDN
CLK
UP/DN
CLK
D
OUT
(LSB)
8
8-BIT REGISTER/COUNTER
9-BIT SHIFT REGISTER
WAVEFORM 1
WAVEFORM 2
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS HIGH UNLESS
DISABLED BY CS
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS LOW UNLESS
DISABLED BY CS
(SEE NOTE 1)
(SEE NOTE 2)
SHDN
D
D
D
OUT
OUT
OUT
CS
CURRENT
8
8-BIT
DAC
Voltage Waveforms for t
Load Circuit for t
0.8V
8
100pF
3k
t
DV
Q9
2.4V
0.4V
DZ,
5V t
t
DZ
t
t
DZ
LTC1428-50
DZ
DV
WAVEFORM 1
DZ
1428-50 BD
, t
I
D
WAVEFORM 2, t
OUT
OUT
DV
2.0V
1428-50 TC02
90%
10%
1428-50 TC04
DV
5