9
LTC2602/LTC2612/LTC2622
2602fa
PIN FUNCTIONS
UU
U
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
≤ VREF ≤ VCC.
VOUT B and VOUT A (Pins 5 and 8): DAC Analog Voltage
Outputs. The output range is 0 – VREF.
VCC (Pin 6): Supply Voltage Input. 2.5V ≤ VCC ≤ 5.5V.
GND (Pin 7): Analog Ground.
VOUT A
REF
CS/LD
SCK
VOUT B
GND
VCC
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
U
WW
SDI
CS/LD
SCK
2602 F01
t2
t10
t5
t7
t6
t1
t3
t4
12
3
23
24
C3
C2
C1
D1
D0