ltc1448cs8-trpbf Linear Technology Corporation, ltc1448cs8-trpbf Datasheet

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ltc1448cs8-trpbf

Manufacturer Part Number
ltc1448cs8-trpbf
Description
Ltc1448 - Dual 12-bit Rail-to-rail Micropower Dac
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
TYPICAL
SO-8 Package
12-Bit Resolution
Buffered True Rail-to-Rail Voltage Output
External Reference Input Can Be Tied to V
Output Swings from 0V to V
3V and 5V Supply Operation
Schmitt Trigger on Clock Input Allows Direct
Optocoupler Interface
Power-On Reset Clears DACs to 0V
3-Wire Serial Interface
Maximum DNL Error: 0.5LSB
Low Cost
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Cellular Telephones
P
2
1
3
D
CLK
CS/LD
IN
Functional Block Diagram: 12-Bit Rail-to-Rail Dual DAC
POWER-ON
APPLICATION
24-BIT
LATCH
RESET
SHIFT
REG
AND
DAC
2.7V TO 5.5V
V
U
CC
7
12-BIT
12-BIT
DAC B
DAC A
REF
GND
U
REF
4
6
CC
+
+
V
V
OUT B
OUT A
1448 TA01
The LTC
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 V
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.
DESCRIPTION
8
5
RAIL-TO-RAIL
VOLTAGE
OUTPUTS
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1448 is a dual rail-to-rail voltage output, 12-bit
Dual 12-Bit Rail-to-Rail
CC
providing rail-to-rail operation from supplies
Micropower DAC
U
–0.1
–0.2
–0.3
–0.4
–0.5
0.1
0.5
0.4
0.3
0.2
0
0
512
Differential Nonlinearity
1024
vs Input Code
1536
CODE
2048 2560
LTC1448
3072 3584 4095
1448 TA02
1

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ltc1448cs8-trpbf Summary of contents

Page 1

... 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 OUT B 8 – ...

Page 2

... Shorted to V OUT CC = 4.5V to 5.5V 4.096V CC REF U W ORDER PART TOP VIEW NUMBER V 8 OUT B LTC1448CN8 LTC1448IN8 GND 6 LTC1448CS8 V 5 OUT A LTC1448IS8 S8 PACKAGE 8-LEAD PLASTIC SO S8 PART MARKING = 100°C/W (N8) 1448 JA = 150°C/W (S8) JA 1448I MIN TYP MAX 12 12 ± 0.2 ± 0.5 ± 5.0 ± ...

Page 3

ELECTRICAL CHARACTERISTICS V = 2.7V to 5.5V, V and V unloaded, REF V CC OUT A OUT B SYMBOL PARAMETER CONDITIONS AC Performance Voltage Output Slew Rate Voltage Output Settling Time (Notes ± 0.5LSB Digital Feedthrough Reference ...

Page 4

LTC1448 W U TYPICAL PERFORMANCE CHARACTERISTICS Integral Nonlinearity (INL –1 –2 –3 –4 –5 0 2048 2560 3072 3584 4095 512 1024 1536 CODE 1448 G01 Minimum Output Voltage vs Output Sink Current 800 ...

Page 5

W BLOCK I D AGRA CLK 1 24-BIT SHIFT REGISTER CS/LD 3 REF 4 POWER-ON RESET DIAGRA S OPERATING SEQUENCE DAC A INPUT MSB D D11 D10 ...

Page 6

LTC1448 U U DEFI ITIO S Differential Nonlinearity (DNL): The differerence between the measured change and the ideal 1LSB change for any two adjacent codes. The DNL error between any two codes is calculated as follows: DNL = ( V ...

Page 7

U U APPLICATIONS INFORMATION Rail-to-Rail Output Considerations In any rail-to-rail DAC, the output swing is limited to voltages within the supply range. If the DAC offset is negative, the output for the lowest codes limits shown in ...

Page 8

LTC1448 U TYPICAL APPLICATIONS This circuit shows how to use one LTC1448 to make an autoranging ADC. The microprocessor sets the reference span and the Common pin for the analog input by loading the appropriate digital code into the LTC1448. ...

Page 9

U TYPICAL APPLICATIONS CLK CS/ PIN NOT SHOWN FOR CLARITY OUT Digitally Programmable Current Source 100V S FOR 0 REF ...

Page 10

LTC1448 PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 12

... OUT Package with Clear Pin LTC1458 4.5V to 5.5V 4.095V CC OUT LTC1458L 2.7V to 5.5V 2.5V CC OUT Low Power Multiplying V DAC in MSOP-8 OUT Package. Output Swings from GND to REF. REF Input Can Be Tied 1448f LT/TP 0398 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 ...

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