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PDF LTC2654 Data sheet ( Hoja de datos )
| Número de pieza | LTC2654 | |
| Descripción | Quad 16-/12-Bit Rail-to-Rail DACs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Precision Reference 10ppm/°C Max
n Maximum INL Error: ±4LSB at 16-Bits
n Low ±2mV (Max) Offset Error
n Guaranteed Monotonic Over Temperature
n Selectable Internal or External Reference
n 2.7V to 5.5V Supply Range (LTC2654-L)
n Integrated Reference Buffers
n Ultralow Crosstalk Between DACs (<3nV•s)
n Power-on-Reset to Zero-Scale/Mid-Scale
n Asynchronous DAC Update Pin
n Tiny 20-Lead 4mm × 4mm QFN and 16-Lead Narrow
SSOP Packages
APPLICATIONS
n Mobile Communications
n Process Control and Industrial Automation
n Instrumentation
n Automatic Test Equipment
n Automotive
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LTC2654
Quad 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
DESCRIPTION
The LTC®2654 is a family of quad 16-/12-bit rail-to-rail
DACs with integrated 10ppm/°C maximum reference . The
DACs have built-in high performance, rail-to-rail, output
buffers and are guaranteed monotonic. The LTC2654-L
has a full-scale output of 2.5V with the integrated refer-
ence and operates from a single 2.7V to 5.5V supply.
The LTC2654-H has a full-scale output of 4.096V with
the integrated reference and operates from a 4.5V to
5.5V supply. Each DAC can also operate with an external
reference, which sets the full-scale output to 2 times the
external reference voltage.
These DACs communicate via a SPI/MICROWIRE compat-
ible 4-wire serial interface which operates at clock rates
up to 50MHz. The LTC2654 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, LTM, Linear Technology and the Linear logo 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 and patent pending.
BLOCK DIAGRAM
REFCOMP
GND
REFLO
VOUTA
DAC A
INTERNAL REFERENCE
REFIN/OUT
VCC
DAC D
VOUTD
VOUTB
DAC B
CS/LD
SCK
LDAC
CONTROL LOGIC
DECODE
32-BIT SHIFT REGISTER
DAC C
VOUTC
POWER-ON
RESET
PORSEL
SDO
SDI
CLR
2654 TA01a
4
VCC = 5V
3
INL Curve
2
1
0
–1
–2
–3
–4
128
16384
32768
CODE
49152 65535
2654 TA01b
2654f
1
1 page  
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LTC2654
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.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VOUT DAC Output Span
PSR Power Supply Rejection
ROUT
DC Output Impedance
DC Crosstalk
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 (Note 5)
Due to Load Current Change (Note 5)
Due to Powering Down (per Channel) (Note 5)
l
l
0 to 2.5
0 to 2 • VEXTREF
–80
0.04
0.15
0.04 0.15
V
V
dB
Ω
Ω
±1.5 μV
±2 μV/mA
±1 μV
ISC Short-Circuit Output Current
VCC = 5.5V VEXTREF = 2.8V (Note 6)
Code: Zero-Scale; Forcing Output to VCC (Note 6)
Code: Full-Scale; Forcing Output to GND (Note 6)
VCC = 2.7V VEXTREF = 1.4V
Code: Zero-Scale; Forcing Output to VCC
Code: Full-Scale; Forcing Output to GND
l
l
l
l
20
20
10
10
65 mA
65 mA
45 mA
45 mA
LTC2654B-L16/ LTC2654-L12 (Internal Reference = 1.25V)
SYMBOL PARAMETER
CONDITIONS
Reference
Reference Output Voltage
Reference Temperature Coefficient
(Note 7)
Reference Line Regulation
Reference Short-Circuit Current
Refcomp Pin Short-Circuit Current
Reference Load Regulation
Reference Output Voltage Noise Density
Reference Input Range
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
CREFCOMP = CREFIN/OUT = 0.1μF, at f = 1kHz
External Reference Mode (Note 13)
Reference Input Current
Reference Input Capacitance
(Note 9)
Power Supply
VCC Positive Supply Voltage
ICC Supply Current
ISD Supply Current in Shutdown Mode
Digital I/O
For Specified Performance
VCC = 5V, Internal Reference On (Note 8)
VCC = 5V, Internal Reference Off (Note 8)
VCC = 3V, Internal Reference On (Note 8)
VCC = 3V, Internal Reference Off (Note 8)
VCC = 5V (Note 8)
VIH Digital Input High Voltage
VIL Digital Input Low Voltage
VOH Digital Output High Voltage
VOL Digital Output Low Voltage
VCC = 3.6V to 5.5V
VCC = 2.7V to 3.6V
VCC = 4.5V to 5.5V
VCC = 2.7V to 4.5V
Load Current = –100μA
Load Current = 100μA
MIN
1.248
l
l
l 0.5
l
l
l 2.7
l
l
l
l
l
l 2.4
l 2.0
l
l
l VCC – 0.4
l
TYP
1.25
±2
–80
3
60
40
30
0.001
20
1.7
1.3
1.6
1.2
MAX
1.252
±10
5
200
VCC/2
1
5.5
2.5
2
2.2
1.7
3
0.8
0.6
0.4
UNITS
V
ppm/°C
dB
mA
μA
mV/mA
nV/√Hz
V
μA
pF
V
mA
mA
mA
mA
μA
V
V
V
V
V
V
2654f
5
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2654-12
Integral Nonlinearity (INL)
1.0
VCC = 5V
VREF = 2.048V
0.5
Differential Nonlinearity (DNL)
1.0
VCC = 3V
VREF = 1.25V
0.5
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LTC2654
Settling to ±1LSB (12-Bit) Rising
CS/LD
5V/DIV
00
4.6μs
VOUT
1mV/DIV
–0.5 –0.5
–1.0
0
1024
LTC2654-16
2048
CODE
3072
4095
2654 G15
–1.0
0
1024
2048
CODE
3072
4095
2654 G16
Load Regulation
10
VCC = 5V (LTC2654-H)
8 VCC = 3V (LTC2654-L)
6
4
2
0
–2
–4
–6
–8 INTERNAL REF
CODE = MID-SCALE
–10
–50 –40 –30 –20 –10 0 10 20 30 40 50
IOUT (mA)
2654 G18
Current Limiting
0.20
VCC = 5V (LTC2654-H)
0.15 VCC = 3V (LTC2654-L)
0.10
0.05
0
–0.05
–0.10
–0.15
INTERNAL REF
CODE = MID-SCALE
–0.20
–50 –40 –30 –20 –10 0 10 20 30 40 50
IOUT (mA)
2654 G19
2μs/DIV
2654 G17
1/4 SCALE TO 3/4 SCALE STEP
VCC = 5V, VFS = 4.095V, RL = 2k, CL = 200pF
AVERAGE OF 2048 EVENTS
Headroom at Rails
vs Output Current
5.0
4.5 5V (LTC2654-H) SOURCING
4.0
3.5
3.0 3V (LTC2654-L) SOURCING
2.5
2.0
1.5
1.0 5V (LTC2654-H) SINKING
0.5 3V (LTC2654-H) SINKING
0
0 1 2 3 4 5 6 7 8 9 10
IOUT (mA)
2654 G20
Offset Error vs Temperature
3
2
1
0
–1
–2
–3
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2654 G21
Zero-Scale Error vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2654 G22
Gain Error vs Temperature
64
48
32
16
0
–16
–32
–48
–64
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
2654 G23
2654f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2654.PDF ] | |
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