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PDF LTC1454IS Data sheet ( Hoja de datos )
| Número de pieza | LTC1454IS | |
| Descripción | Dual 12-Bit Rail-to-Rail Micropower DACs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s 12-Bit Resolution
s Buffered True Rail-to-Rail Voltage Output
s 5V Operation, ICC: 700µA Typ (LTC1454)
s 3V Operation, ICC: 450µA Typ (LTC1454L)
s Built-In Reference: 2.048V (LTC1454)
1.220V (LTC1454L)
s CLR Pin
s Power-On Reset
s 16-Lead SO 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 Cellular Telephones
LTC1454/LTC1454L
Dual 12-Bit Rail-to-Rail
Micropower DACs
DESCRIPTION
The LTC®1454/LTC1454L are complete single supply,
dual rail-to-rail voltage output, 12-bit digital-to-analog
converters (DACs) in a 16-lead SO package. They include
an output buffer amplifier with variable gain (×1 or × 2)
and an easy-to-use 3-wire cascadable serial interface.
The LTC1454 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.
The LTC1454L has an onboard 1.22V reference and a full-
scale output of 2.5V in a × 2 gain configuration. It operates
from a single 2.7V to 5.5V supply.
Low power supply current, excellent DNL and small size
allow these parts to be used in a host of applications where
size, DNL and single supply operation are important.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Functional BDloaciskyD-Ciahgarianmed: CDounatlr1o2l -OBuittpRuatsil-to-Rail DAC
LTC1454: 5V
LTC1454L: 3V TO 5V
9, 15
VCC
LTC1454: 2.048V
10 LTC1454L: 1.22V
REFOUT
REFHI B 14
4 DIN
3 CLK
µP
24-BIT
SHIFT
5 CS/LD REG
AND
6 DOUT
DAC
LATCH
12-BIT
DAC B
12-BIT
DAC A
+ VOUT B 16
–
X1/X2 B 1
REFHI A 11
+ VOUT A 8
–
POWER-ON
RESET
CLR
2
REFLO
12
GND
13
X1/X2 A 7
1454 BD02
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
1454 G08
1
1 page  
LTC1454/LTC1454L
PIN FUNCTIONS
X1/X2 B, X1/X2 A (Pins 1, 7): The Input Pin that Sets the
Gain for DAC 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.
CLR (Pin 2): The Clear Pin for the DAC. Clears both DACs
to zero scale when pulled low. This pin should be tied to
VCC for normal operation.
CLK (Pin 3): The Serial Interface Clock Input.
DIN (Pin 4): The Serial Data Input. Data on the DIN pin is
latched into the shift register on the rising edge of the serial
clock. Data is loaded as one 24-bit word. The first 12 bits
are for DAC A, MSB-first and the second 12 bits are for
DAC B, MSB-first.
CS/LD (Pin 5): The Serial Interface Enable and Load
Control Input. 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 register, updating the DAC output.
DOUT (Pin 6): The Output of the Shift Register which
Becomes Valid on the Rising Edge of the Serial Clock.
VOUT A, VOUT B (Pins 8, 16): The Buffered DAC Outputs.
VCC (Pins 9, 15): The Positive Supply Input. 4.5 ≤ VCC
≤ 5.5V (LTC1454), 2.7V ≤ VCC ≤ 5.5V (LTC1454L). Re-
quires a bypass capacitor to ground.
REFOUT (Pin 10): The Output of the Internal Reference.
REFHI A , REFHI B (Pins 11,14): The Inputs to the DAC
Resistor Ladder for DAC A/B.
REFLO (Pin 12): The Bottom of the DAC Resistor Ladder
for Both DACs. This can be used to offset zero-scale above
ground. REFLO should be connected to ground when no
offset is required.
GND (Pin 13): Ground.
5
5 Page 
LTC1454/LTC1454L
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16 15 14 13 12 11 10 9
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
1 2 34 5 6 7 8
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
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
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
TYP
S16 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 LTC1454IS.PDF ] | |
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