LTC1257C Linear Technology, LTC1257C Datasheet

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LTC1257C

Manufacturer Part Number
LTC1257C
Description
Complete Single Supply 12-Bit Voltage Output DAC in SO-8
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
CONTROL OUTPUT 1
CONTROL OUTPUT 2
PPLICATI
8-Pin SO Package
Buffered Voltage Output
Built-In 2.048V Reference
500 V/LSB with 2.048V Full Scale
1/2LSB Max DNL Error
Guaranteed 12-Bit Monotonic
3-Wire Cascadable Serial Interface
Wide Single Supply Range: V
Low Power: I
Digital Offset/Gain Adjustment
Industrial Process Control
Automatic Test Equipment
0.1 F
0.1 F
A
S
CC
O
PPLICATI
Daisy-Chained Control Outputs
Typ = 350 A with 5V Supply
U
5V
S
V
V
OUT
OUT
GND
GND
LTC1257
LTC1257
O
V
V
CC
V
V
REF
REF
CC
CC
U
= 4.75V to 15.75V
LOAD
LOAD
D
D
CLK
CLK
OUT
OUT
D
D
IN
IN
TO NEXT DAC
1257 TA01
P
D
The LTC
output D/A converter (DAC) in an SO-8 package. The
LTC1257 includes an output buffer amplifier, 2.048V
voltage reference and an easy to use three-wire cascadable
serial interface. An external reference can be used to
override the internal reference and extend the output
voltage range to 12V. The power supply current is a low
350 A when operating from a 5V supply, making the
LTC1257 ideal for battery-powered applications. The space-
saving 8-pin SO package and operation with no external
components provide the smallest 12-bit D/A system
available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
Complete Single Supply
®
1257 is a complete single supply, 12-bit voltage
12-Bit Voltage Output
–0.5
0.5
0.0
0
512
Differential Nonlinearity
U
1024
vs Input Code
1536
CODE
2048 2560
DAC in SO-8
3072 3584 4098
1257 TA05
LTC1257
1

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LTC1257C Summary of contents

Page 1

... A when operating from a 5V supply, making the LTC1257 ideal for battery-powered applications. The space- saving 8-pin SO package and operation with no external components provide the smallest 12-bit D/A system available. , LTC and LT are registered trademarks of Linear Technology Corporation CLK P LOAD ...

Page 2

... TTL Input Voltage .......................... – 0. .............................................. – 0. OUT REF ................................................ – 0. Operating Temperature Range LTC1257C ............................................. LTC1257I......................................... – Maximum Junction Temperature Plastic Package ............................. – 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL C ...

Page 3

ELECTRICAL C HARA TERISTICS C (2.475V V V – 2.7V), I 2mA, T REF CC OUT SYMBOL PARAMETER Power Supply V Positive Supply Voltage CC I Supply Current CC Op Amp DC Performance Short-Circuit Current Low Short-Circuit Current High Output ...

Page 4

LTC1257 W U TYPICAL PERFORMANCE CHARACTERISTICS Minimum Supply Voltage vs Load Current #1 5 INTERNAL REF 4 FULL SCALE OUT T = 25°C 4.6 A 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0.01 0.1 1 ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Differential Nonlinearity (DNL) 0.5 0.0 –0.5 3072 3584 4098 0 512 1024 1536 2048 2560 CODE 1257 TA05 CTIO S CLK (Pin 1): The TTL level input for the serial ...

Page 6

LTC1257 U U DEFI ITIO S LSB: The least significant bit or the ideal voltage difference between two successive codes. n LSB = (V – V )/2 – The number of digital input bits V ...

Page 7

W BLOCK I D AGRA LOGIC SUPPLY CLK D IN LOAD REF 2.048V REFERENCE DIAGRA t 1 CLK B11 D IN MSB LOAD B11 D OUT (PREVIOUS WORD) 5V REGULATOR 12-BIT SHIFT REGISTER 12 ...

Page 8

LTC1257 U OPERATIO Serial Interface The data on the D input is loaded into the shift register IN on the rising edge of the clock. The MSB is loaded first and the LSB last. The DAC register loads the data ...

Page 9

U O TYPICAL A PPLICATI 5V 100 0.1 F 100k 2N3906 V IN – J LT1025A + GND COMMON + 10 F – Auto Ranging 8-Channel ADC with Shutdown CH0 ANALOG ...

Page 10

LTC1257 PACKAGE DESCRIPTIO 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 Low Power, Complete V DAC in SO-8 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 Output Swings from GND to REF, REF Input Can Be Tied 1257fa LT/TP 0198 REV A 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 ...

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