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PDF LTC1655IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1655IS8 | |
| Descripción | 16-Bit Rail-to-Rail Micropower DAC in SO-8 Package | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1655
16-Bit Rail-to-Rail
Micropower DAC in
SO-8 Package
FEATURES
s 16-Bit Monotonicity Over Temperature
s Deglitched Rail-to-Rail Voltage Output
s SO-8 Package
s 5V Single Supply Operation
s ICC(TYP): 600µA
s Internal Reference
s Maximum DNL Error: 1LSB
s Power-On Reset
s 3-Wire Cascadable Serial Interface
s Low Cost
U
APPLICATIO S
s Digital Calibration
s Industrial Process Control
s Automatic Test Equipment
s Cellular Telephones
DESCRIPTIO
The LTC®1655 is a rail-to-rail voltage output, 16-bit digi-
tal-to-analog converter (DAC) in an SO-8 package. It
includes an output buffer and a reference. The 3-wire serial
interface is compatible with SPI/QSPI and MICROWIRETM
protocols. The CLK input has a Schmitt trigger that allows
direct optocoupler interface.
The LTC1655 has an onboard 2.048V reference that can be
overdriven to a higher voltage. The output swings from 0V
to 4.096V when using the internal reference. The typical
power dissipation is 3.0mW on a single 5V supply.
The LTC1655 is pin compatible with Linear Technology’s
12-bit VOUT DAC family, allowing an easy upgrade path.
It is the only buffered 16-bit DAC in an SO-8 package and
it includes an onboard reference for stand alone
performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Functional Block Diagram: 16-Bit Rail-to-Rail DAC
2 DIN
4.5V TO 5.5V
8
VCC
REF
2.048V
6
REF
1 CLK
16-BIT 16
µP SHIFT
3 CS/LD REG
AND
DAC
LATCH
4 DOUT
16-BIT
DAC
TO
OTHER
DACS
POWER-ON
RESET
GND
5
+
–
VOUT 7
RAIL-TO-RAIL
VOLTAGE
OUTPUT
(0V TO 4.096V)
1655 TA01
Differential Nonlinearity
vs Input Code
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
0
16384
32768
CODE
49152 65535
1655 TA02
1
1 page  
LTC1655
PIN FUNCTIONS
CLK (Pin 1): The TTL Level Input for the Serial Interface
Clock.
DIN (Pin 2): The TTL Level Input for the Serial Interface
Data. Data on the DIN pin is latched into the shift register
on the rising edge of the serial clock and is loaded MSB
first. The LTC1655 requires a 16-bit word.
CS/LD (Pin 3): The TTL Level Input for the Serial Inter-
face 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 register, updating the DAC output.
DOUT (Pin 4): Output of the Shift Register. Becomes valid
on the rising edge of the serial clock and swings from GND
to VCC.
GND (Pin 5): Ground.
REF (Pin 6): Reference. Output of the internal reference is
2.048V. There is a gain of two from this pin to the output.
The reference can be overdriven from 2.2V to VCC/2. When
tied to VCC/2, the output will swing from GND to VCC. The
output can only swing to within its offset specification of
VCC (see Applications Information).
VOUT (Pin 7): Deglitched Rail-to-Rail Voltage Output. VOUT
clears to 0V on power-up.
VCC (Pin 8): Positive Supply Input. 4.5V ≤ VCC ≤ 5.5V.
Requires a bypass capacitor to ground.
WU W
TI I G DIAGRA
t9
t7
t1
t2
t4 t3
CLK
12
3
t6
15 16
DIN
D15
MSB
D14 D13
CS/LD
DOUT
t8
D15
PREVIOUS WORD
D14 D13
PREVIOUS WORD PREVIOUS WORD
D1
D0
LSB
t5
D0
PREVIOUS WORD
D15
CURRENT WORD
1655 TD
5
5 Page 
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
LTC1655
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)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*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
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 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 LTC1655IS8.PDF ] | |
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