FEATURES
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LTC2636
Octal 12-/10-/8-Bit SPI V
OUT
DACs with10ppm/°C Reference
DESCRIPTION
The
LTC
®
2636
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 LTC2636-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2636-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 an SPI/MICROWIRE-com-
patible 3-wire serial interface which operates at clock
rates up to 50MHz. Hardware clear (CLR) and asynchro-
nous DAC update (LDAC) pins are available in the MSOP
package. The LTC2636 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 Analog
Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S.
Patents including 5396245, 5859606, 6891433, 6937178, 7414561.
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Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2636-L)
4.096V Full-Scale 10ppm/°C (LTC2636-H)
Maximum INL Error: 2.5LSB (LTC2636-12)
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 (LTC2636-L)
Ultralow Crosstalk Between DACs (<2.4nV•s)
Low Power: 0.9mA at 3V (LTC2636-L)
Power-On-Reset to Zero-Scale/Mid-Scale
Double-Buffered Data Latches
Tiny 14-Lead 4mm
×
3mm DFN and 16-Lead MSOP
Packages
APPLICATIONS
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Mobile Communications
Process Control and Industrial Automation
Automatic Test Equipment
Portable Equipment
Automotive
Optical Networking
BLOCK DIAGRAM
INTERNAL REFERENCE
GND
REGISTER
REGISTER
REGISTER
REGISTER
SWITCH
V
REF
V
CC
V
OUTA
V
REF
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTB
V
REF
REGISTER
REGISTER
REGISTER
V
OUTC
V
REF
REGISTER
REGISTER
REGISTER
V
OUTD
REGISTER
DAC D
DAC E
REGISTER
DAC C
DAC F
V
REF
V
OUTE
DAC B
DAC G
V
REF
V
OUTF
DAC A
DAC H
V
REF
V
OUTG
INL (LSB)
1
V
OUTH
REF
12-Bit Integral Nonlinearity
(LTC2636-LZ12)
2
V
CC
= 3V
INTERNAL REF
.
0
–1
–2
0
1024
CS/LD
CONTROL LOGIC
SCK
(LDAC)
32-BIT SHIFT REGISTER
( ) MSOP PACKAGE ONLY
POWER-ON RESET
2636 BD
2048
CODE
3072
4095
2636 TA01
DECODE
SDI
(CLR)
2636fc
For more information
www.linear.com/LTC2636
1
LTC2636
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) ................................... –0.3V to 6V
CS/LD,
SCK, SDI,
LDAC, CLR
....................... –0.3V to 6V
V
OUT
A–V
OUT
H .................–0.3V to Min(V
CC
+ 0.3V, 6V)
REF ...................................–0.3V to Min(V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2636C ................................................ 0°C to 70°C
LTC2636I .............................................–40°C to 85°C
LTC2636H (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)
MS16-Lead Package ......................................... 300°C
PIN CONFIGURATION
TOP VIEW
V
CC
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
CS/LD
SCK
1
2
3
4
5
6
7
15
14 GND
13 V
OUT
H
12 V
OUT
G
11 V
OUT
F
9 REF
8 SDI
10 V
OUT
E
V
CC
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
LDAC
CS/LD
SCK
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
V
OUT
H
V
OUT
G
V
OUT
F
V
OUT
E
REF
CLR
SDI
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
2
2636fc
For more information
www.linear.com/LTC2636
LTC2636
ORDER INFORMATION
LTC2636 C
DE
–L
Z
12
#TR
http://www.linear.com/product/LTC2636#orderinfo
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 parts specified with wider operating temperature ranges.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2636fc
For more information
www.linear.com/LTC2636
3
LTC2636
PRODUCT SELECTION GUIDE
PART MARKING*
PART NUMBER
LTC2636-LMI12
LTC2636-LMI10
LTC2636-LMI8
LTC2636-LMX12
LTC2636-LMX10
LTC2636-LMX8
LTC2636-LZ12
LTC2636-LZ10
LTC2636-LZ8
LTC2636-HMI12
LTC2636-HMI10
LTC2636-HMI8
LTC2636-HMX12
LTC2636-HMX10
LTC2636-HMX8
LTC2636-HZ12
LTC2636-HZ10
LTC2636-HZ8
DFN
LMI12
LMI10
6LMI8
LMX12
LMX10
6LMX8
6LZ12
6LZ10
36LZ8
HMI12
HMI10
6HMI8
MSOP
6LMI12
6LMI10
36LMI8
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-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
2.7V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-5.5V
4.5V-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
6LMX12 2.5V•(4095/4096)
6LMX10 2.5V•(1023/1024)
36LMX8 2.5V•(255/256)
36LZ12
36LZ10
636LZ8
6HMI12
6HMI10
36HMI8
2.5V•(4095/4096)
2.5V•(1023/1024)
2.5V•(255/256)
4.096V•(4095/4096)
4.096V•(1023/1024)
4.096V•(255/256)
HMX12 6HMX12 4.096V•(4095/4096)
HMX10 6HMX10 4.096V•(1023/1024)
6HMX8 36HMX8 4.096V•(255/256)
6HZ12
6HZ10
36HZ8
36HZ12
36HZ10
636HZ8
4.096V•(4095/4096)
4.096V•(1023/1024)
4.096V•(255/256)
*Above options are available in a 14-lead DFN package (LTC2636-DE) or 16-lead MSOP package (LTC2636-MS).
4
2636fc
For more information
www.linear.com/LTC2636
LTC2636
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.
LTC2636-LMI12/-LMI10/-LMI8/-LMX12/-LMX10/-LMX8/-LZ12/-LZ10/-LZ8 (V
FS
= 2.5V)
LTC2636-8
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
ZSE
V
OS
V
OSTC
GE
GE
TC
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, 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 11)
–10mA ≤ I
OUT
≤ 10mA
Internal Reference, Mid-Scale,
V
CC
= 3V±10%,
–5mA ≤ I
OUT
≤ 5mA
V
CC
= 5V±10%, (Note 11)
–10mA ≤ I
OUT
≤ 10mA
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
LTC2636-10
TYP
LTC2636-12
TYP
MAX
UNITS
Bits
Bits
±1
±1
0.5
±0.05
±10
±2.5
5
±5
LSB
LSB
mV
mV
µV/°C
±0.8
%FSR
ppm/°C
ppm/°C
ppm/°C
MIN
8
8
TYP
MAX MIN
10
10
±0.5
MAX MIN
12
12
±0.5
Differential Nonlinearity V
CC
= 3V, Internal Reference (Note 4)
±0.05 ±0.5
0.5
±0.05
±10
±0.2
10
10
10
0.009 0.016
0.009 0.016
±0.8
5
±5
±0.2
0.5
±0.05
±10
±0.2
10
10
10
±1
5
±5
±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 0.156
0.09 0.156
0.09 0.156
0.09 0.156
0.09 0.156
0.09 0.156
Ω
Ω
SYMBOL PARAMETER
V
OUT
PSR
I
SC
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
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
l
l
l
l
l
l
l
2.7
0.8
0.9
0.9
1
0.5
0.5
1.1
1.3
1.3
1.5
20
30
I
SD
Supply Current in Power-Down Mode
(Note 7)
2636fc
For more information
www.linear.com/LTC2636
5
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