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PDF LTC2656 Data sheet ( Hoja de datos )
| Número de pieza | LTC2656 | |
| Descripción | Octal 16-/12-Bit Rail-to-Rail DACs | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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FEATURES
n Precision 10ppm/°C Max Reference
n Maximum INL Error: ±4LSB at 16 Bits
n Guaranteed Monotonic over Temperature
n Selectable Internal or External Reference
n 2.7V to 5.5V Supply Range (LTC2656-L)
n Integrated Reference Buffers
n Ultralow Crosstalk Between DACs(<1nV•s)
n Power-On-Reset to Zero-Scale/Mid-scale
n Asynchronous LDAC Update Pin
n Tiny 20-Lead 4mm × 5mm QFN and 20-Lead
Thermally Enhanced TSSOP Packages
APPLICATIONS
n Mobile Communications
n Process Control and Industrial Automation
n Instrumentation
n Automatic Test Equipment
n Automotive
Electrical Specifications Subject to Change
LTC2656
Octal 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
DESCRIPTION
The LTC®2656 is a family of octal 16-/12-bit rail-to-rail
DACs with a precision integrated reference. The DACs have
built-in high performance, rail-to-rail, output buffers and
are guaranteed monotonic.The LTC2656-L has a full-scale
output of 2.5V with the integrated 10ppm/°C reference and
operates from a single 2.7V to 5.5V supply. The LTC2656-H
has a full-scale output of 4.096V with the integrated refer-
ence and operates from a 4.5V to 5.5V supply. Each DAC can
also operate with an external reference, which sets the DAC
full-scale output to two times the external reference voltage.
These DACs communicate via a SPI/MICROWIRE™ com-
patible 4-wire serial interface which operates at clock rates
up to 50MHz. The LTC2656 incorporates a power-on reset
circuit that is controlled by the PORSEL pin. If PORSEL
is tied to GND the DACs reset to zero-scale. If PORSEL is
tied to VCC, the DACs reset to mid-scale.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5396245, 6891433.
BLOCK DIAGRAM
REFCOMP
GND
REFLO
VOUTA
REF
DAC A
REF
INTERNAL REFERENCE
REF
DAC H
REF
REFIN/OUT
VCC
VOUTH
VOUTB
DAC B
REF
DAC G
REF
VOUTG
VOUTC
DAC C
REF
DAC F
REF
VOUTF
VOUTD
CS/LD
SCK
LDAC
DAC D
CONTROL LOGIC
DECODE
32-BIT SHIFT REGISTER
DAC E
VOUTE
POWER-ON RESET
PORSEL
SDO
SDI
CLR
2656 BD
4
3
2
1
0
–1
–2
–3
–4
128
INL vs Code
16384
DACA
DACB
DACC
DACD
DACE
DACF
DACG
DACH
32768
CODE
49152 65535
2656 TA01
2656p
1
1 page  
www.DataSheet4U.com
LTC2656
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VOUT unloaded unless otherwise specified.
LTC2656B-L16/LTC2656-L12 (internal reference = 1.25V)
SYMBOL PARAMETER
CONDITIONS
LTC2656-12
LTC2656B-16
MIN TYP MAX MIN TYP MAX UNITS
DC Performance
Resolution
l 12
16
Bits
Monotonicity
(Note 3)
l 12
16
Bits
DNL Differential Nonlinearity
(Note 3)
l
±0.1 ±0.5
±0.3 ±1
LSB
INL Integral Nonlinearity (Note 3) VCC = 5.5V, VREF = 2.5V
l
Load Regulation
VCC = 5V ±10%, Internal Reference, Mid-Scale,
–15mA ≤ IOUT ≤ 15mA
l
VCC = 3V ±10%, Internal Reference, Mid-Scale,
–7.5mA ≤ IOUT ≤ 7.5mA
l
ZSE Zero-Scale Error
l
±0.5 ±1
0.04 0.125
0.06 0.25
13
±2 ±4
LSB
0.6 2 LSB/mA
1 4 LSB/mA
13
mV
VOS Offset Error
VREF = 1.25V (Note 4)
VOS Temperature Coefficient
GE Gain Error
l ±1 ±2
±1 ±2
mV
2 2 μV/°C
l ±0.02 ±0.1 ±0.02 ±0.1 %FSR
Gain Temperature Coefficient
1 1 ppm/°C
SYMBOL PARAMETER
CONDITIONS
VOUT DAC Output Span
PSR Power Supply Rejection
ROUT DC Output Impedance
DC Crosstalk (Note 5)
Internal Reference
External Reference = VEXTREF
VCC ±10%
VCC = 5V ±10%, Internal Reference, Mid-Scale,
–15mA ≤ IOUT ≤ 15mA
VCC = 3V ±10%, Internal Reference, Mid-Scale,
–7.5mA ≤ IOUT ≤ 7.5mA
Due to Full-Scale Output Change
Due to Load Current Change
Due to Powering Down (per Channel)
ISC Short-Circuit Output Current (Note 6) VCC = 5.5V, VEXTREF = 2.75V
Code: Zero Scale, Forcing Output to VCC
Code: Full Scale, Forcing Output to GND
VCC = 2.7V, VEXTREF = 1.35V
Code: Zero Scale, Forcing Output to VCC
Code: Full Scale, Forcing Output to GND
Reference
Reference Output Voltage
Reference Temperature Coefficient
C-Grade (Note 7)
I-Grade (Note 7)
Reference Line Regulation
Reference Short-Circuit Current
REFCOMP Pin Short-Circuit Current
Reference Load Regulation
VCC ±10%
VCC = 5.5V, Forcing Output to GND
VCC = 5.5V, Forcing Output to GND
VCC = 3V ±10% or 5V ±10%, IOUT = 100μA
Sourcing
Reference Output Voltage Noise Density CREFCOMP = CREFIN/OUT = 0.1μF at f = 1kHz
l
l
l
l
l
l
l
l
MIN
20
20
10
10
1.248
TYP
0 to 2.5
0 to 2 • VEXTREF
–80
0.04
0.04
±1.5
±2
±1
1.25
±2
±2
–80
3
60
40
30
MAX
0.15
0.15
60
60
40
40
1.252
±10
5
200
UNITS
V
V
dB
Ω
Ω
μV
μV/mA
μV
mA
mA
mA
mA
V
ppm/°C
ppm/°C
dB
mA
μA
mV/mA
nV/√Hz
2656p
5
5 Page 
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TYPICAL PERFORMANCE CHARACTERISTICS LTC2656-H16
LTC2656
Integral Nonlinearity (INL)
4
VCC = 5V
3
2
1
0
–1
–2
–3
–4
128
16384
32768
CODE
49152 65535
2656 G08
DNL vs Temperature
1.0
VCC = 5V
0.5
DNL (POS)
0
DNL (NEG)
–0.5
Differential Nonlinearity (DNL)
1.0
VCC = 5V
0.5
0
–0.5
–1.0
128
16384
32768
CODE
49152 65535
2656 G09
INL vs Temperature
4
VCC = 5V
3
2
INL (POS)
1
0 INL (NEG)
–1
–2
–3
–4
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2656 G10
REFOUT Voltage vs Temperature
2.054
VCC = 5V
2.052
2.050
2.048
2.046
2.044
–1.0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2656 G11
Settling to ±1LSB Rising
2.042
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2656 G12
Settling to ±1LSB Falling
CS/LD
5V/DIV
VOUT
250μV/DIV
7.9μs
1/4 SCALE TO
3/4 SCALE STEP
VCC = 5V,
VFS = 4.096V
RL = 2k, CL = 200pF
AVERAGE OF 2048
EVENTS
2μs/DIV
2656 G13
VOUT
250μV/DIV
CS/LD
5V/DIV
6.1μs
3/4 SCALE TO 1/4
SCALE STEP
VCC = 5V, VFS = 4.096V
RL = 2k, CL = 200pF
AVERAGE OF 2048
EVENTS
2μs/DIV
2656 G14
2656p
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2656.PDF ] | |
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