LTC2614 Linear Technology Corporation, LTC2614 Datasheet - Page 10

• Manufacturer Part Number: LTC2614
• Description: Quad 14-bit Rail-to-rail Dacs In 16-lead Ssop
• Manufacturer: Linear Technology Corporation

LTC2604/LTC2614/LTC2624
TIMING DIAGRAM
OPERATION
Power-On Reset
The LTC2604/LTC2614/LTC2624 clear the outputs to
zero scale when power is fi rst applied, making system
initialization consistent and repeatable. The LTC2604-1/
LTC2614-1/LTC2624-1 set the voltage outputs to midscale
when power is fi rst applied.
For some applications, downstream circuits are active
during DAC power-up, and may be sensitive to nonzero
10
BLOCK DIAGRAM
CS/LD
SDO
SCK
SDI
REF LO
V
V
CS/LD
REF A
REF B
GND
SCK
OUTA
OUTB
1
2
3
4
5
6
7
8
t
5
DAC A
DAC B
t
7
t
1
t
2
1
CONTROL
LOGIC
32-BIT SHIFT REGISTER
Figure 1
t
3
2
t
8
outputs from the DAC during this time. The LTC2604/
LTC2614/LTC2624 contain circuitry to reduce the power-
on glitch; furthermore, the glitch amplitude can be made
arbitrarily small by reducing the ramp rate of the power
supply. For example, if the power supply is ramped to 5V
in 1ms, the analog outputs rise less than 10mV above
ground (typ) during power-on. See Power-On Reset Glitch
in the Typical Performance Characteristics section.
t
4
DECODE
3
23
DAC D
DAC C
t
6
24
t
V
V
REF D
REF C
10
2604 BD
OUT D
OUT C
CLR
SDO
V
SDI
12
11
16
15
14
13
10
CC
9
2604 F01
2604fc