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PDF LTC1448C Data sheet ( Hoja de datos )
| Número de pieza | LTC1448C | |
| Descripción | Dual 12-Bit Rail-to-Rail Micropower DAC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1448
Dual 12-Bit Rail-to-Rail
Micropower DAC
FEATURES
s SO-8 Package
s 12-Bit Resolution
s Buffered True Rail-to-Rail Voltage Output
s External Reference Input Can Be Tied to VCC
s Output Swings from 0V to VREF
s 3V and 5V Supply Operation
s Schmitt Trigger on Clock Input Allows Direct
Optocoupler Interface
s Power-On Reset Clears DACs to 0V
s 3-Wire Serial Interface
s Maximum DNL Error: 0.5LSB
s Low Cost
U
APPLICATIONS
s Digital Calibration
s Industrial Process Control
s Automatic Test Equipment
s Cellular Telephones
DESCRIPTION
The LTC®1448 is a dual rail-to-rail voltage output, 12-bit
digital-to-analog converter (DAC). It includes rail-to-rail
output buffer amplifiers and an easy-to-use 3-wire serial
interface. It is available in 8-pin SO and PDIP packages and
provides the smallest footprint of any dual 12-bit DAC.
The LTC1448 has an external reference input pin (REF)
and its outputs swing from 0V to REF. The REF input can
be tied to VCC providing rail-to-rail operation from supplies
of 2.7V to 5.5V. (For devices with internal reference see the
LTC1446 data sheet.) The LTC1448 dissipates 2.5mW
from a 5V supply.
The low power supply current and the small SO-8 package
make the LTC1448 ideal for battery-powered applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Functional Block Diagram: 12-Bit Rail-to-Rail Dual DAC
2.7V TO 5.5V
2 DIN
7
VCC
4
REF
µP
1 CLK
24-BIT
SHIFT
3 CS/LD REG
AND
DAC
LATCH
12-BIT
DAC B
12-BIT
DAC A
+
VOUT B 8
–
RAIL-TO-RAIL
VOLTAGE
OUTPUTS
+
VOUT A 5
–
POWER-ON
RESET
GND
6
1448 TA01
Differential Nonlinearity
vs Input Code
0.5
0.4
0.3
0.2
0.1
0
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
0 512 1024 1536 2048 2560 3072 3584 4095
CODE
1448 TA02
1
1 page  
BLOCK DIAGRA
LTC1448
CLK 1
DIN 2
CS/LD 3
REF 4
24-BIT
SHIFT
REGISTER
POWER-ON
RESET
LD
DAC B
REGISTER
LD
DAC A
REGISTER
12-BIT
DAC B
12-BIT
DAC A
WU W
TI I G DIAGRA S
+
8 VOUT B
–
7 VCC
6 GND
+
5 VOUT A
–
1448 BD
OPERATING SEQUENCE
DAC A INPUT
DAC B INPUT
MSB LSB MSB LSB
DIN D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
CLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
CS/LD
(ENABLE CLOCK)
(UPDATE DAC OUTPUT)
1448 TD01
CLK
t8
DIN
B0-B
PREVIOUS WORD
CS/LD
t4
B11-A
MSB
t1
t3 t2
B0-A
B11-B
LSB MSB
t6 t7
B0-B
LSB
t5
1448 TD02
5
5 Page 
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
LTC1448
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1448C.PDF ] | |
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