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PDF LTC2637 Data sheet ( Hoja de datos )
| Número de pieza | LTC2637 | |
| Descripción | Mobile Communications | |
| Fabricantes | Linear Technology | |
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LTC2637www.DataSheet4U.com
Octal 12-/10-/8-Bit I2C VOUT
DACs with 10ppm/°C Reference
Features
n Integrated Precision Reference:
2.5V Full-Scale 10ppm/°C (LTC2637-L)
4.096V Full-Scale 10ppm/°C (LTC2637-H)
n Maximum INL Error: 2.5LSB (LTC2637-12)
n Low Noise: 0.75mVP-P 0.1Hz to 200KHz
n Guaranteed Monotonic Over –40°C to 125°C
Temperature Range
n Selectable Internal or External Reference
n 2.7V to 5.5V Supply Range (LTC2637-L)
n Ultralow Crosstalk Between DACs (<3nV•s)
n Low Power: 100µA per DAC at 3V (LTC2637-L)
n Power-On-Reset to Zero-Scale/Mid-Scale
n Double-Buffered Data Latches
n Tiny 14-Lead 4mm × 3mm DFN and 16-Lead MSOP
Packages
Applications
n Mobile Communications
n Process Control and Industrial Automation
n Automatic Test Equipment
n Portable Equipment
n Automotive
n Optical Networking
Description
The LTC®2637 is a family of octal 12-, 10-, and 8-bit
voltage-output DACs with an integrated, high-accuracy,
low-drift 10ppm/°C reference in 14-lead DFN and 16-lead
MSOP packages. It has a rail-to-rail output buffer and is
guaranteed monotonic. The LTC2637-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2637-H has a full-scale output of 4.096V,
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 the external reference voltage.
These DACs communicate via a 2-wire I2C-compatible
serial interface. The LTC2637 operates in both the standard
mode (clock rate of 100kHz) and the fast mode (clock rate
of 400kHz). The LTC2637 incorporates a power-on reset
circuit. Options are available for reset to zero-scale or
reset to mid-scale in internal reference mode, or reset to
mid-scale in external reference mode after power-up.
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, 5859606, 6891433, 6937178, 7414561.
Block Diagram
INTERNAL REFERENCE
GND
VOUTA
VREF
VOUTB
VREF
VOUTC
VREF
VOUTD
DAC A
DAC B
DAC C
DAC D
CAO
(CA1)
(CA2)
I2C
ADDRESS
DECODE
DECODE
I2C INTERFACE
( ) MSOP PACKAGE ONLY
SWITCH
VREF
REF
VCC
DAC H
DAC G
VOUTH
VREF
VREF
VOUTG
DAC F
VREF
VOUTF
DAC E
VOUTE
POWER-ON RESET
SCL
SDA
2637 BD
Integral Nonlinearity (LTC2637-LZ12)
2 VCC = 3V
INTERNAL REF.
1
0
–1
–2
0
1024
2048
CODE
3072
4095
2637 TA01
2637fa
1 page  
LTC2637www.DataSheet4U.com
E lectrical 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.
LTC2637-LMI12/ LTC2637-LMI10/ LTC2637-LMI8/ LTC2637-LMX12/ LTC2637-LMX10/ LTC2637-LMX8/ LTC2637-LZ12/
LTC2637-LZ10/ LTC2637-LZ8 (VFS = 2.5V)
LTC2637-8
LTC2637-10
LTC2637-12
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
Resolution
l8
10 12
Bits
Monotonicity
VCC = 3V, Internal Reference (Note 4) l 8
DNL Differential Nonlinearity VCC = 3V, Internal Reference (Note 4) l
10
±0.5
12
±0.5
Bits
±1 LSB
INL
ZSE
VOS
VOSTC
Integral Nonlinearity
Zero-Scale Error
Offset Error
VOS Temperature
Coefficient
VCC = 3V, Internal Reference (Note 4)
VCC = 3V, Internal Reference, Code = 0
VCC = 3V, Internal Reference (Note 5)
VCC=3V, Internal Reference
l
l
l
±0.05
0.5
±0.5
±10
±0.5
5
±5
±0.2 ±1
0.5 5
±0.5 ±5
±10
±1 ±2.5
0.5 5
±0.5 ±5
±10
LSB
mV
mV
µV/°C
GE Gain Error
GETC Gain Temperature
Coefficient
VCC = 3V, Internal Reference
VCC = 3V, Internal Reference (Note 10)
C-Grade
I-Grade
H-Grade
l
±0.2 ±0.8
10
10
10
±0.2 ±0.8
10
10
10
±0.2 ±0.8 %FSR
10 ppm/°C
10 ppm/°C
10 ppm/°C
ROUT
Load Regulation
DC Output Impedance
Internal Reference, Mid-Scale,
VCC = 3V±10%,
–5mA ≤ IOUT ≤ 5mA
VCC = 5V±10%, (Note 15)
–10mA ≤ IOUT ≤ 10mA
Internal Reference, Mid-Scale,
–V5CmC =A
VCC =
3V±10%,
5≤VI±O1U0T%≤,5(mNoAte
15)
–10mA ≤ IOUT ≤ 10mA
l 0.009 0.016 0.035 0.064 0.14 0.256 LSB/mA
l 0.009 0.016 0.035 0.064 0.14 0.256 LSB/mA
l
0.09 0.156
0.09 0.156
0.09 0.156
Ω
l
0.09 0.156
0.09 0.156
0.09 0.156
Ω
SYMBOL
VOUT
PARAMETER
DAC Output Span
PSR Power Supply Rejection
ISC
Short Circuit Output Current (Note 6)
Sinking
Sourcing
Power Supply
VCC Positive Supply Voltage
ICC Supply Current (Note 7)
ISD Supply Current in Power-Down Mode
(Note 7)
CONDITIONS
External Reference
Internal Reference
VCC = 3V±10% or 5V±10%
VFS
ZF=uerlVlo-CS-CSc=caale5le;.5;VVVOOUUTTsshhoortreteddtotoGVNCDC
For Specified Performance
VCC = 3V, VREF =2.5V, External Reference
VVCCCC
=
=
3V,
5V,
Internal Reference
VREF =2.5V, External
Reference
VCC = 5V, Internal Reference
VCC = 5V, C-Grade, I-Grade
VCC = 5V, H-Grade
MIN
l
l
TYP
00ttooV2R.5EF
–80
27
–28
MAX
48
–48
UNITS
V
V
dB
mA
mA
l 2.7
5.5
l 0.8 1.1
l 0.9 1.3
l 0.9 1.3
l 1 1.5
l 1 20
l 1 30
V
mA
mA
mA
mA
µA
µA
2637fa
5 Page 
LTC2637www.DataSheet4U.com
Typical Performance Characteristics
TA = 25°C, unless otherwise noted. LTC2637-L12 (Internal Reference, VFS = 2.5V)
Integral Nonlinearity (INL)
1.0
VCC = 3V
Differential Nonlinearity (DNL)
1.0
VCC = 3V
0.5 0.5
00
–0.5 –0.5
–1.0
0
1024
2048
CODE
3072
4095
2637 G01
–1.0
0
INL vs Temperature
1.0
VCC = 3V
0.5 INL (POS)
0
INL (NEG)
–0.5
DNL vs Temperature
1.0
VCC = 3V
0.5
DNL (POS)
0
DNL (NEG)
–0.5
1024
2048
CODE
3072
4095
2637 G02
Reference Output Voltage
vs Temperature
1.260
VCC = 3V
1.255
1.250
1.245
–1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2637 G03
–1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2637 G04
1.240
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2637 G05
Settling to ±1LSB Rising
SCL
5V/DIV
9TH CLOCK OF
3RD DATA BYTE
3.6µs
VOUT
1LSB/DIV
1/4 SCALE TO
3/4 SCALE STEP
VCC = 3V, VFS = 2.5V
RL = 2k, CL = 100pF
AVERAGE OF 256 EVENTS
2µs/DIV
2637 G06
Settling to ±1LSB Falling
VOUT
1LSB/DIV
3/4 SCALE TO
1/4 SCALE STEP
VCC = 3V, VFS = 2.5V
RL = 2k, CL = 100pF
AVERAGE OF 256 EVENTS
4.5µs
SCL
5V/DIV
9TH CLOCK OF
3RD DATA BYTE
2µs/DIV
2637 G07
2637fa
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC2637.PDF ] | |
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