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PDF LTC1446IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1446IS8 | |
| Descripción | Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8 | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1446/LTC1446L
Dual 12-Bit Rail-to-Rail
Micropower DACs in SO-8
FEATURES
s Dual DACs with 12-Bit Resolution
s SO-8 Package
s Rail-to-Rail Output Amplifiers
s 3V Operation (LTC1446L): ICC = 650µA Typ
s 5V Operation (LTC1446): ICC = 1000µA Typ
s Internal Reference
s Power-On Reset Clears DACs to 0V
s 3-Wire Cascadable Serial Interface
s Maximum DNL Error: 0.5LSB
s Low Cost
s Schmitt Trigger On Input Allows Direct
Optocoupler Interface
APPLICATI S
s Digital Calibration
s Industrial Process Control
s Automatic Test Equipment
s Cellular Telephones
DESCRIPTIO
The LTC®1446/LTC1446L are dual 12-bit digital-to-analog
converters (DACs) available in an SO-8 package. They are
complete with a rail-to-rail voltage output amplifier, an
internal reference and an easy-to-use 3-wire cascadable
serial interface.
The LTC1446 has an internal reference and a full-scale
output of 4.095V. It operates from a single 4.5V to 5.5V
supply.
The LTC1446L has an internal reference and a full-scale
output of 2.5V. It operates from a single 2.7V to 5.5V
supply.
The low power supply current makes the LTC1446 family
ideal for battery-powered applications. These DACs are
available in space saving 8-pin SO and PDIP packages and
require no external components for operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC
LTC1446: 5V
7 LTC1446L: 3V TO 5V
VCC
2 DIN
µP
1 CLK
24-BIT
SHIFT
3 CS/LD REG
AND
DAC
LATCH
4 DOUT
12-BIT
DAC B
12-BIT
DAC A
+
VOUT B 8
–
RAIL-TO-RAIL
VOLTAGE
OUTPUT
+
VOUT A 5
–
POWER-ON
RESET
GND
6
1446/1446L 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
1446/46L G13
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1446L Supply Current vs Logic
Input Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.5
1.0 1.5 2.0 2.5
LOGIC INPUT VOLTAGE (V)
3.0
1446/46L G10
LTC1446 Supply Current vs
Temperature
970
960
950
VCC = 5.5V
940
930 VCC = 5V
920
910 VCC = 4.5V
900
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1446/46L G11
LTC1446/LTC1446L
LTC1446L Supply Current
vs Temperature
700
690
680
VCC = 3.3V
670
660 VCC = 3V
650
640 VCC = 2.7V
630
620
– 55 – 35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1446/46L G12
PIN FUNCTIONS
CLK: The Serial Interface Clock.
DIN: The Serial Interface Data.
CS/LD: The Serial Interface Enable and Load Control.
When CS/LD is low the CLK signal is enabled, so the data
can be clocked in. When CS/LD is pulled high data is
loaded from the shift register into the DAC registers,
updating the DAC outputs.
DOUT: The output of the shift register which becomes valid
on the rising edge of the serial clock.
GND: Ground.
VOUT A,VOUT B: Buffered DAC Outputs.
VCC: Positive Supply Input.
4.5V ≤ VCC ≤ 5.5V (LTC1446), 2.7V ≤ VCC ≤ 5.5V
(LTC1446L). Requires a bypass capacitor to ground.
5
5 Page 
LTC1446/LTC1446L
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG# 05-08-1510)
0.400*
(10.160)
MAX
87 65
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
12
0.045 – 0.065
(1.143 – 1.651)
34
0.130 ± 0.005
(3.302 ± 0.127)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
( )8.255
+0.635
–0.381
0.065
(1.651)
TYP
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.125
(3.175)
MIN
0.015
(0.380)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
N8 0695
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)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
*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
1 2 34
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
BSC
SO8 0695
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 LTC1446IS8.PDF ] | |
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