FEATURES
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LTC2637
Octal 12-/10-/8-Bit I
2
C V
OUT
DACs with 10ppm/°C Reference
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 I
2
C-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 and
ThinSOT is a trademark 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.
Integrated Precision Reference:
2.5V Full-Scale 10ppm/°C (LTC2637-L)
4.096V Full-Scale 10ppm/°C (LTC2637-H)
Maximum INL Error: 2.5LSB (LTC2637-12)
Low Noise: 0.75mV
P-P
0.1Hz to 200KHz
Guaranteed Monotonic Over –40°C to 125°C
Temperature Range
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2637-L)
Ultralow Crosstalk Between DACs (<3nV•s)
Low Power: 100μA per DAC at 3V (LTC2637-L)
Power-On-Reset to Zero-Scale/Mid-Scale
Double-Buffered Data Latches
Tiny 14-Lead 4mm
×
3mm DFN and 16-Lead MSOP
Packages
Mobile Communications
Process Control and Industrial Automation
Automatic Test Equipment
Portable Equipment
Automotive
Optical Networking
APPLICATIONS
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BLOCK DIAGRAM
Integral Nonlinearity (LTC2637-LZ12)
INTERNAL REFERENCE
GND
SWITCH
V
REF
V
CC
REGISTER
REGISTER
REGISTER
REGISTER
1
INL (LSB)
REF
2
V
CC
= 3V
INTERNAL REF
.
V
OUTA
V
REF
DAC A
DAC H
V
REF
V
OUTH
REGISTER
REGISTER
REGISTER
V
OUTB
V
REF
REGISTER
0
DAC B
DAC G
V
REF
V
OUTG
–1
REGISTER
REGISTER
REGISTER
V
OUTC
V
REF
REGISTER
DAC C
DAC F
V
REF
V
OUTF
–2
0
1024
2048
CODE
3072
4095
2637 TA01
REGISTER
REGISTER
REGISTER
V
OUTD
REGISTER
DAC D
DAC E
V
OUTE
CAO
(CA1)
(CA2)
I
2
C
ADDRESS
DECODE
I
2
C INTERFACE
DECODE
POWER-ON RESET
SCL
SDA
2637 BD
( ) MSOP PACKAGE ONLY
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LTC2637
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) ................................... –0.3V to 6V
SCL, SDA ..................................................... –0.3V to 6V
V
OUTA
- V
OUTH
,
CA0, CA1, CA2...................–0.3V to Min(V
CC
+ 0.3V, 6V)
REF ...................................–0.3V to Min(V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2637C ................................................ 0°C to 70°C
LTC2637I .............................................–40°C to 85°C
LTC2637H (Note 3) ............................ –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Package ...................................................... 300°C
PIN CONFIGURATION
TOP VIEW
V
CC
V
OUTA
V
OUTB
V
OUTC
V
OUTD
CA0
SCL
1
2
3
4
5
6
7
15
14 GND
13 V
OUTH
12 V
OUTG
11 V
OUTF
10 V
OUTE
9 REF
8 SDA
V
CC
V
OUTA
V
OUTB
V
OUTC
V
OUTD
CA2
CA0
SCL
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
V
OUTH
V
OUTG
V
OUTF
V
OUTE
REF
CA1
SDA
DE PACKAGE
14-LEAD (4mm 3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
MS PACKAGE
16-LEAD (4mm 5mm) PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 110°C/W
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LTC2637
ORDER INFORMATION
LTC2637 C
DE
–L
Z
12
#TR
PBF
LEAD FREE DESIGNATOR
TAPE AND REEL
TR = 2500-Piece Tape and Reel
RESOLUTION
12 = 12-Bit
10 = 10-Bit
8 = 8-Bit
POWER-ON RESET
MI = Reset to Mid-Scale in Internal Reference Mode
MX = Reset to Mid-Scale in External Reference Mode
Z = Reset to Zero-Scale in Internal Reference Mode
FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE
L = 2.5V
H = 4.096V
PACKAGE TYPE
DE = 14-Lead DFN
MS = 16-Lead MSOP
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
PRODUCT PART NUMBER
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
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LTC2637
PRODUCT SELECTION GUIDE
PART MARKING*
PART NUMBER
LTC2637-LMI12
LTC2637-LMI10
LTC2637-LMI8
LTC2637-LMX12
LTC2637-LMX10
LTC2637-LMX8
LTC2637-LZ12
LTC2637-LZ10
LTC2637-LZ8
LTC2637-HMI12
LTC2637-HMI10
LTC2637-HMI8
LTC2637-HMX12
LTC2637-HMX10
LTC2637-HMX8
LTC2637-HZ12
LTC2637-HZ10
LTC2637-HZ8
DFN
7LMI2
7LMI1
7LMI8
7LMX2
7LMX1
7LMX8
7LZ12
7LZ10
37LZ8
7HMI2
7HMI1
7HMI8
7HMX2
7HMX1
7HMX8
7HZ12
7HZ10
37HZ8
MSOP
7LMI12
7LMI10
37LMI8
V
FS
WITH INTERNAL
REFERENCE
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
POWER-ON
RESET TO CODE
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Zero-Scale
Zero-Scale
Zero-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Zero-Scale
Zero-Scale
Zero-Scale
POWER-ON
REFERENCE
MODE
Internal
Internal
Internal
External
External
External
Internal
Internal
Internal
Internal
Internal
Internal
External
External
External
Internal
Internal
Internal
RESOLUTION
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
V
CC
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
MAXIMUM
INL
±2.5LSB
±1LSB
±0.5LSB
±2.5LSB
±1LSB
±0.5LSB
±2.5LSB
±1LSB
±0.5LSB
±2.5LSB
±1LSB
±0.5LSB
±2.5LSB
±1LSB
±0.5LSB
±2.5LSB
±1LSB
±0.5LSB
7LMX12 2.5V • (4095/4096)
7LMX10 2.5V • (1023/1024)
37LMX8 2.5V • (255/256)
37LZ12
37LZ10
637LZ8
7HMI12
7HMI10
37HMI8
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
7HMX12 4.096V • (4095/4096)
7HMX10 4.096V • (1023/1024)
37HMX8 4.096V • (255/256)
37HZ12
37HZ10
637HZ8
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
*Above options are available in a 14-lead DFN package (LTC2637xDE) or 16-lead MSOP package (LTC2637xMS).
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LTC2637
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specified.
LTC2637-LMI12/ LTC2637-LMI10/ LTC2637-LMI8/ LTC2637-LMX12/ LTC2637-LMX10/ LTC2637-LMX8/ LTC2637-LZ12/
LTC2637-LZ10/ LTC2637-LZ8 (V
FS
= 2.5V)
LTC2637-8
SYMBOL PARAMETER
Resolution
Monotonicity
DNL
INL
ZSE
V
OS
V
OSTC
GE
GE
TC
Differential Nonlinearity
Integral Nonlinearity
Zero-Scale Error
Offset Error
V
OS
Temperature
Coefficient
Gain Error
Gain Temperature
Coefficient
V
CC
= 3V, Internal Reference (Note 4)
V
CC
= 3V, Internal Reference (Note 4)
V
CC
= 3V, Internal Reference (Note 4)
V
CC
= 3V, Internal Reference, Code = 0
V
CC
= 3V, Internal Reference (Note 5)
V
CC
=3V, Internal Reference
V
CC
= 3V, Internal Reference
V
CC
= 3V, Internal Reference (Note 10)
C-Grade
I-Grade
H-Grade
Internal Reference, Mid-Scale,
V
CC
= 3V±10%,
–5mA ≤ I
OUT
≤ 5mA
V
CC
= 5V±10%, (Note 15)
–10mA ≤ I
OUT
≤ 10mA
Internal Reference, Mid-Scale,
V
CC
= 3V±10%,
–5mA ≤ I
OUT
≤ 5mA
V
CC
= 5V±10%, (Note 15)
–10mA ≤ I
OUT
≤ 10mA
l
l
l
LTC2637-10
10
10
12
12
±0.5
±0.2
0.5
±0.5
±10
±1
5
±5
LTC2637-12
MAX
UNITS
Bits
Bits
±1
±1
0.5
±0.5
±10
±2.5
5
±5
LSB
LSB
mV
mV
μV/°C
±0.8
%FSR
ppm/°C
ppm/°C
ppm/°C
CONDITIONS
l
l
l
l
l
l
MIN TYP
8
8
MAX MIN TYP
MAX MIN TYP
±0.5
±0.05
0.5
±0.5
±10
±0.2
10
10
10
0.009 0.016
0.009 0.016
±0.8
±0.5
5
±5
±0.2
10
10
10
±0.8
±0.2
10
10
10
Load Regulation
0.035 0.064
0.035 0.064
0.14 0.256 LSB/mA
0.14 0.256 LSB/mA
R
OUT
DC Output Impedance
l
l
0.09
0.09
0.156
0.156
0.09
0.09
0.156
0.156
0.09 0.156
0.09 0.156
Ω
Ω
SYMBOL
V
OUT
PSR
I
SC
PARAMETER
DAC Output Span
Power Supply Rejection
Short Circuit Output Current (Note 6)
Sinking
Sourcing
Positive Supply Voltage
Supply Current (Note 7)
CONDITIONS
External Reference
Internal Reference
V
CC
= 3V±10% or 5V±10%
V
FS
= V
CC
= 5.5V
Zero-Scale; V
OUT
shorted to V
CC
Full-Scale; V
OUT
shorted to GND
For Specified Performance
V
CC
= 3V, V
REF
=2.5V, External Reference
V
CC
= 3V, Internal Reference
V
CC
= 5V, V
REF
=2.5V, External Reference
V
CC
= 5V, Internal Reference
V
CC
= 5V, C-Grade, I-Grade
V
CC
= 5V, H-Grade
l
l
l
l
l
l
l
l
l
MIN
TYP
0 to V
REF
0 to 2.5
–80
27
–28
MAX
UNITS
V
V
dB
48
–48
5.5
mA
mA
V
mA
mA
mA
mA
μA
μA
Power Supply
V
CC
I
CC
2.7
0.8
0.9
0.9
1
1
1
1.1
1.3
1.3
1.5
20
30
I
SD
Supply Current in Power-Down Mode
(Note 7)
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PCB设计
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