9
LTC2602/LTC2612/LTC2622
2602fa
PIN FUNCTIONS
UUU
CS/LD (Pin 1): Serial Interface Chip Select/Load Input.
When CS/LD is low, SCK is enabled for shifting data on SDI
into the register. When CS/LD is taken high, SCK is dis-
abled and the specified command (see Table 1) is ex-
ecuted.
SCK (Pin 2): Serial Interface Clock Input. CMOS and TTL
compatible.
SDI (Pin 3): Serial Interface Data Input. Data is applied to
SDI for transfer to the device at the rising edge of SCK. The
BLOCK DIAGRA
W
LTC2602/LTC2612/LTC2622 accept input word lengths
of either 24 or 32 bits.
REF (Pin 4): Reference Voltage Input. 0V ≤ V
REF
≤ V
CC
.
V
OUT B
and V
OUT A
(Pins 5 and 8): DAC Analog Voltage
Outputs. The output range is 0 – V
REF
.
V
CC
(Pin 6): Supply Voltage Input. 2.5V ≤ V
CC
≤ 5.5V.
GND (Pin 7): Analog Ground.
V
OUT A
REF
CS/LD
SCK
V
OUT B
GND
V
CC
SDI
2602 BD
8
1
2
4
3
5
7 6
DAC A DAC B
DECODE
CONTROL
LOGIC
24-BIT SHIFT REGISTER
DAC
REGISTER
INPUT
REGISTER
INPUT
REGISTER
DAC
REGISTER
Figure 1
TI I G DIAGRA
UWW
SDI
CS/LD
SCK
2602 F01
t
2
t
10
t
5
t
7
t
6
t
1
t
3
t
4
1232324
C3 C2 C1 D1 D0
