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PDF LTC1665IN Data sheet ( Hoja de datos )
| Número de pieza | LTC1665IN | |
| Descripción | Micropower Octal 8-Bit and 10-Bit DACs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Tiny: 8 DACs in the Board Space of an SO-8
s Micropower: 56µA per DAC Plus
1µA Sleep Mode for Extended Battery Life
s Pin Compatible 8-Bit LTC1665 and 10-Bit LTC1660
s Wide 2.7V to 5.5V Supply Range
s Rail-to-Rail Voltage Outputs Drive 1000pF
s Reference Range Includes Supply for Ratiometric
0V-to-VCC Output
s Reference Input Impedance is Constant—
Eliminates External Buffer
U
APPLICATIO S
s Mobile Communications
s Remote Industrial Devices
s Automatic Calibration for Manufacturing
s Portable Battery-Powered Instruments
s Trim/Adjust Applications
LTC1665/LTC1660
Micropower Octal
8-Bit and 10-Bit DACs
DESCRIPTIO
The 8-bit LTC®1665 and 10-bit LTC1660 integrate eight
accurate, serially addressable digital-to-analog convert-
ers (DACs) in tiny 16-pin narrow SSOP packages. Each
buffered DAC draws just 56µA total supply current, yet is
capable of supplying DC output currents in excess of
5mA and reliably driving capacitive loads to 1000pF.
Sleep mode further reduces total supply current to 1µA.
Linear Technology’s proprietary, inherently monotonic
voltage interpolation architecture provides excellent lin-
earity while allowing for an exceptionally small external
form factor.
Ultralow supply current, power-saving Sleep mode and
extremely compact size make the LTC1665 and LTC1660
ideal for battery-powered applications, while their ease of
use, high performance and wide supply range make them
excellent choices as general purpose converters.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRA
GND 1
VOUT A 2
DAC A
DAC H
VOUT B 3
DAC B
DAC G
VOUT C 4
DAC C
DAC F
VOUT D 5
REF 6
CS/LD 7
SCK 8
DAC D
DAC E
CONTROL
LOGIC
ADDRESS
DECODER
SHIFT REGISTER
16 VCC
15 VOUT H
14 VOUT G
13 VOUT F
12 VOUT E
11 CLR
10 DOUT
9 DIN
1665/60 BD
LTC1665 Differential Nonlinearity (DNL)
0.5
VCC = 5V
0.4 VREF = 4.096V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
64
128
CODE
192 255
1665/60 G09
LTC1660 Differential Nonlinearity (DNL)
1
0.8
VCC = 5V
VREF = 4.096V
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1
0 256
512
CODE
768 1023
1665/60 G13
1
1 page  
LTC1665/LTC1660
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1665/LTC1660)
Minimum Supply Headroom vs
Load Current (Output Sourcing)
1400
1200
1000
VREF = 4.096V
∆VOUT < 1LSB
CODE = 255 (LTC1665)
CODE = 1023 (LTC1660)
125°C
800
25°C
600
–55°C
400
Minimum VOUT vs
Load Current (Output Sinking)
1400
VCC = 5V
1200 CODE = 0
125°C
1000
800
25°C
600
–55°C
400
200 200
0
0 2 4 6 8 10
| |IOUT (mA) (Sourcing)
1665/60 G03
0
0 2 4 6 8 10
| |IOUT (mA) (Sinking)
1665/60 G04
Large-Signal Step Response
5
VCC = VREF = 5V
10% TO
4 90% STEP
3
2
1
0
0 20 40 60 80 100
TIME (µs)
1665/60 G05
Supply Current vs Temperature
500
480
460 VCC = 5.5V
440 VCC = 4.5V
420
VCC = 3.6V
400
380
360 VCC = 2.7V
340
320
300
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1665/60 G06
Supply Current vs Logic Input Voltage
2
ALL DIGITAL INPUTS
SHORTED TOGETHER
1.6
1.2
0.8
0.4
0
012345
LOGIC INPUT VOLTAGE (V)
1665/60 G07
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1665)
Integral Nonlinearity (INL)
1
VCC = 5V
0.8 VREF = 4.096V
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1
0 64 128 192 255
CODE
1665/60 G08
Differential Nonlinearity (DNL)
0.5
VCC = 5V
0.4 VREF = 4.096V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
64 128 192 255
CODE
1665/60 G09
5
5 Page 
U
OPERATIO
LTC1665/LTC1660
OUTPUT
VOLTAGE
VREF = VCC
VREF = VCC
INPUT CODE
(c)
POSITIVE
FSE
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE
0 128 255
INPUT CODE
(a)
0V
NEGATIVE
OFFSET
INPUT CODE
(b)
1665/60 F03
Figure 3. Effects of Rail-to-Rail Operation On a DAC Transfer Curve. (a) Overall Transfer Function (b) Effect of Negative
Offset for Codes Near Zero Scale (c) Effect of Positive Full-Scale Error for Input Codes Near Full Scale When VREF = VCC
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1665IN.PDF ] | |
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