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PDF LTC1450 Data sheet ( Hoja de datos )
| Número de pieza | LTC1450 | |
| Descripción | Parallel Input/ 12-Bit Rail-to-Rail Micropower DACs in SSOP | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1450 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s Guaranteed Monotonic
s Buffered True Rail-to-Rail Voltage Output
s 12-Bit Resolution
s 3V Operation (LTC1450L) ICC: 250µA Typ
s 5V Operation (LTC1450) ICC: 400µA Typ
s Parallel 12-Bit or 8 + 4-Bit Double Buffered
Digital Input
s Internal Reference
s Output Buffer Configurable to Gain of 1 or 2
s Configurable as a Multiplying DAC
s Internal Power-On Reset
s Maximum DNL Error: 0.5LSB
U
APPLICATIONS
s Digital Calibration
s Industrial Process Control
s Automatic Test Equipment
s Arbitrary Function Generators
s Battery-Powered Data Conversion Products
s Feedback Control Loops and Gain Control
LTC1450/LTC1450L
Parallel Input, 12-Bit
Rail-to-Rail Micropower
DACs in SSOP
DESCRIPTION
The LTC®1450/LTC1450L are complete single supply, rail-
to-rail voltage output, 12-bit digital-to-analog converters
(DACs) in a 24-pin SSOP or PDIP package. They include an
output buffer amplifier, reference and a double buffered
parallel digital interface.
The LTC1450 operates from a 4.5V to 5.5V supply. The
output can be pin strapped for 4.095V or 2.048V full-scale.
It has a 2.048V internal reference.
The LTC1450L operates from a 2.7V to 5.5V supply. The
output can be pin strapped for 2.5V or 1.22V full-scale. It
has a 1.22V internal reference.
The LTC1450/LTC1450L offer true stand-alone perfor-
mance. In addition, the reference output, high and low
reference inputs and gain setting resistor are brought to
pins for maximum flexibility.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
LTC1450: 5V
LTC1450L: 3V TO 5V
D11 (MSB)
DATA IN FROM
MICROPROCESSOR
DATA BUS
D8
D7
UPPER
4-BIT
INPUT
LATCH
LOWER
8-BIT
INPUT
LATCH
12-BIT
DAC
LATCH
REFOUT
REFERENCE
LTC1450: 2.048V
LTC1450L: 1.22V
12-BIT
DAC
REFHI
VCC
+
–
VOUT
LTC1450:
0V TO 4.095V
LTC1450L:
0V TO 2.5V
FROM
MICROPROCESSOR
DECODE LOGIC
FROM
SYSTEM RESET
D0 (LSB)
CSMSB
WR
CSLSB
LDAC
CLR
POWER-ON
RESET
GND
REFLO X1/X2
LTC1450
LTC1450L
1450/50L TA01
Differential Nonlinearity
vs Input Code
0.5
0.0
–0.5
0 512 1024 1536 2048 2560 3072 3584 4095
CODE
1450/50L TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1450/LTC1450L
LTC1450L Supply Current
vs Logic Input Voltage
1600
1400
VCC = 3V
ALL LOGIC INPUTS
TIED TOGETHER
1200
1000
800
600
400
200
0
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
LOGIC INPUT VOLTAGE (V)
1450/50L G04
LTC1450 Output Offset Voltage
vs Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
– 55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1450/50L G07
Power Supply Rejection
vs Frequency
90
CODE = FFFH
80
70
60
50
VOUT
REFOUT
40
30
20
10
0
1 10 100 1k 10k 10M
FREQUENCY (Hz)
1450/50L G10
LTC1450 Output Swing
vs Load Resistance
4.5
4.0 FULL SCALE
3.5 RL TIED TO GND
3.0
2.5
VCC = 5V
2.0
1.5
1.0
0.5
0
10
ZERO SCALE
RL TIED TO VCC
100 1k
LOAD RESISTANCE (Ω)
10k
1450/50L G05
LTC1450
Differential Nonlinearity (DNL)
0.2
LTC1450 Pull-Down Voltage vs
Output Sink Current Capability
1000
125°C
100
25°C
10
–55°C
1
0.1
0.0001 0.001 0.01 0.1 1 10
OUTPUT SINK CURRENT (mA)
100
1450/50L G06
LTC1450
Integral Nonlinearity (INL)
2
00
– 0.2
0 512 1024 1536 2048 2560 3072 3584 4095
CODE
1450/50L G08
LTC1450 Total Harmonic
Distortion + Noise vs Frequency
–40
VCC = 5V
VREFHI = 2VP-P
–50 VOUT = 4VP-P
–60
–70
–80
–90
–100
100
1k 10k
FREQUENCY (Hz)
100k
1450/50L G11
–2
0 512 1024 1536 2048 2560 3072 3584 4095
CODE
1450/50L G09
LTC1450
Broadband Output Noise
CODE = FFFH
X1/X2 = GND
BW = 3Hz to 1.2MHz
TOTAL = 0.35mVRMS
5ms/DIV
1450/50L G12
5
5 Page 
LTC1450/LTC1450L
TYPICAL APPLICATIONS N
Filter VREF to Lower Output Noise (0.18mVRMS at VOUT)
DIN
FROM µP
DATA BUS
FROM µP AND
DECODE LOGIC
FROM
SYSTEM RESET
5V
0.1µF
10Ω
DATA (0:11)
CSLSB
CSMSB
WR
LDAC
CLR
VCC REFOUT REFHI
LTC1450
LTC1450L
GND
VOUT
X1/X2
REFLO
4.7µF
OUTPUT
LTC1450/50L • TA03
Digitally Programmable Noninverting Amplifier
DIN
FROM µP
DATA BUS
FROM µP AND
DECODE LOGIC
FROM
SYSTEM RESET
LTC1450: VIN = 0V TO 2.048V
(VCC = 4.5V TO 5V)
LTC1450L: VIN = 0V TO 1.22V
VCC
(VCC = 2.7V TO 5.5V)
LTC1450L: VIN = 0V TO 2.048V
0.1µF
(VCC = 4.5V TO 5.5V)
DATA (0:11)
CSLSB
CSMSB
WR
LDAC
CLR
VCC REFOUT REFHI
LTC1450
LTC1450L
GND
VOUT
X1/X2
REFLO
( )LTC1450: VOUT =
DIN
4096
•
2
VIN
( )LTC1450L: VOUT =
DIN
4096
•
2.05
VIN
LTC1450/50L • TA04
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1450.PDF ] | |
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