LTC1454CS Linear Technology, LTC1454CS Datasheet - Page 9

• Manufacturer Part Number: LTC1454CS
• Description: IC D/A CONV 12BIT R-R DUAL16SOIC
• Manufacturer: Linear Technology

Specifications of LTC1454CS

• Settling Time: 14µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 3.5mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
A Single Supply, 4-Quadrant Multiplying DAC
The LTC1454 can also be used for 4-quadrant multiplying
with an offset signal ground of 1.22V. This application is
shown in Figure 2. The inputs are connected to REFHI B or
REFHI A and have a 1.22V amplitude around a signal
U
INFORMATION
U
CS/LD
V
OUT A
CLK
D
IN
V
W
OA/B
= V
= V
IN
X1/X2 B
CLR
CLK
D
CS/LD
D
X1/X2 A
V
IN
OUT A
IN
OUT
– V
– 1.22 2.0
REFLO
LTC1454
U
GAIN
4096
D
REFOUT
REFHI B
REFHI A
IN
V
REFLO
OUT B
GND
4096
V
V
– 1.0 + 1.22V
D
CC
CC
IN
Figure 2
– 1 +1 + V
ground of 1.22V. The outputs will swing from 0V to 2.44V,
as shown by the equation with the figure. Since the signal
ground is around 1.22V, REFLO is offset above ground by
using an LT1034CS8-1.2 as shown.
5V
REFLO
V
1.22V 1.22V
V
V
1.22V 1.22V
INA
OUT B
INB
LT1034CS8-1.2
0.1 F
1454 F02
LTC1454/LTC1454L
10k
9