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PDF LTC1458 Data sheet ( Hoja de datos )
| Número de pieza | LTC1458 | |
| Descripción | Quad 12-Bit Rail-to-Rail Micropower DACs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1458/LTC1458L
Quad 12-Bit Rail-to-Rail
Micropower DACs
FEATURES
s 12-Bit Resolution
s Buffered True Rail-to-Rail Voltage Output
s 5V Operation, ICC: 1.1mA Typ (LTC1458)
s 3V Operation, ICC: 800µA Typ (LTC1458L)
s Built-In Reference: 2.048V (LTC1458)
1.220V (LTC1458L)
s CLR Pin
s Power-On Reset
s SSOP-28 Package
s 3-Wire Cascadable 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 Low Power Systems
DESCRIPTION
The LTC®1458/LTC1458L are complete single supply,
quad rail-to-rail voltage output, 12-bit digital-to-analog
converters (DACs) in SO-28 and SSOP-28 packages. They
include an output buffer amplifier with variable gain (×1 or
×2) and an easy-to-use 3-wire cascadable serial interface.
The LTC1458 has an onboard reference of 2.048V and a
full-scale output of 4.095V in a × 2 gain configuration. It
operates from a single 4.5V to 5.5V supply dissipating
only 5.5mW (ICC = 1.1mA typ).
The LTC1458L has an onboard 1.22V reference and a full-
scale output of 2.5V in a ×2 gain configuration. It operates
from a single supply of 2.7V to 5.5V dissipating 2.4mW.
Excellent DNL, low supply current and a wide range of
built-in functions allow these parts to be used in a host of
applications when flexibility, power and single supply
operation are important.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
FunctionDalaiBslyo-cCkhDaiinaegdraCmo:nQtruoaldO1u2tp-uBtist Rail-to-Rail DAC
2.048V (LTC1458)
1.22V (LTC1458L)
FROM µP
5V (LTC1458)
3V TO 5V (LTC1458L)
REFOUT
CS/LD CLK DIN
VCC
REFHI C
REFHI B
VOUT C
X1/X2 C
REFLO C
REFHI D
VOUT D
X1/X2 D
REFLO D
DAC C
DAC D
48-BIT
SHIFT REGISTER
AND
DAC REGISTER
DAC B
DAC A
CLR DOUT
VOUT B
X1/X2 B
REFLO B
REFHI A
VOUT A
X1/X2 A
REFLO A
1458 BD01
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
1458 G09
1
1 page  
LTC1458/LTC1458L
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1458 Full-Scale Voltage vs
Temperature
4.110
4.105
4.100
4.095
4.090
4.085
4.080
–55 –25
5 35 65
TEMPERATURE (°C)
95 125
1458 G06
LTC1458
Offset Voltage vs Temperature
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –25 5 35 65 95 125
TEMPERATURE (°C)
1458 G07
LTC1458
Supply Current vs Temperature
950
940
930
920 VCC = 5.5V
910
900
890 VCC = 5V
880
870
VCC = 4.5V
860
850
–55 –25 5 35 65 95 125
TEMPERATURE (°C)
1458 G05
PIN FUNCTIONS
X1/X2 C, X1/X2 D,X1/X2 A, X1/X2 B (Pins 1, 14, 16, 27):
The Input Pin that Sets the Gain for DAC C/D/A/B. When
grounded the gain will be 2, i.e., output full-scale will be
2 • REFHI. When connected to VOUT the gain will be 1, i.e.,
output full-scale will be equal to REFHI.
VOUT C, VOUT D, VOUT A, VOUT B (Pins 2, 13, 17, 26): The
Buffered DAC Outputs.
CS/LD (Pin 3): The Serial Interface Enable and Load
Control Input.
DIN (Pin 4): The Serial Data Input.
REFHI C, REFHI D, REFHI A, REFHI B,(Pins 5, 9, 20, 24):
The Inputs to the DAC Resistor Ladder for DAC C/D/A/B.
GND (Pins 6, 23): Ground.
REFLO C, REFLO D, REFLO A, REFLO B, (Pins 7, 8, 21,
22): The Bottom of the DAC Resistor Ladders for the
DACs. These can be used to offset zero-scale above
ground. REFLO should be connected to ground when no
offset is required.
DOUT (Pin 10): The Output of the Shift Register which
Becomes Valid on the Rising Edge of the Serial Clock.
CLK (Pin 11): The Serial Interface Clock Input.
VCC (Pins 15, 28): The Positive Supply Input. 4.5V ≤ VCC
≤ 5.5V (LTC1458), 2.7V ≤ VCC ≤ 5.5V (LTC1458L). Re-
quires a bypass capacitor to ground.
REFOUT (Pin 19): The Output of the Internal Reference.
CLR (Pin 25): The Clear Pin. Clears all DACs to zero-scale
when pulled low.
5
5 Page 
LTC1458/LTC1458L
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
SW Package
28-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.697 – 0.712*
(17.70 – 18.08)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
NOTE 1
0.394 – 0.419
(10.007 – 10.643)
0.291 – 0.299**
(7.391 – 7.595)
0.010
(0.254
–
–
0.029
0.737)
×
45°
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.093 – 0.104
(2.362 – 2.642)
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.050
0.009 – 0.013
(0.229 – 0.330)
NOTE:
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
TYP
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
*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
0.004 – 0.012
(0.102 – 0.305)
S28 (WIDE) 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 LTC1458.PDF ] | |
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