LTC2634
Quad 12-/10-/8-Bit
Rail-to-Rail DACs with
10ppm/°C Reference
FEATURES
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DESCRIPTION
The LTC
®
2634 is a family of quad 12-, 10- and 8-bit volt-
age output DACs with an integrated, high accuracy, low
drift 10ppm/°C reference in 16-lead QFN and 10-lead
MSOP packages. It has rail-to-rail output buffers and is
guaranteed monotonic. The LTC2634-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2634-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
full-scale output to the external reference voltage.
These DACs communicate via an SPI/MICROWIRE compat-
ible 3-wire serial interface which operates at clock rates
up to 50MHz. Serial data output (SDO), a hardware clear
(CLR), and an asynchronous DAC update (LDAC) capability
are available in the QFN package. The LTC2634 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 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, 5859606, 6891433, 6937178, 7414561.
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Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2634-L)
4.096V Full-Scale 10ppm/°C (LTC2634-H)
Maximum INL Error: ±2.5 LSB (LTC2634-12)
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 (LTC2634-L)
Ultralow Crosstalk Between DACs (2.4nV•s)
Low Power: 0.6mA at 3V
Power-On Reset to Zero-Scale/Mid-Scale
Double Buffered Data Latches
Tiny 16-Lead 3mm
×
3mm QFN and 10-Lead
MSOP Packages
APPLICATIONS
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Mobile Communications
Process Control and Industrial Automation
Automatic Test Equipment
Portable Equipment
Automotive
BLOCK DIAGRAM
GND
INTERNAL
REFERENCE
SWITCH
V
REF
(REFLO)
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTA
V
CC
2
DAC D
V
OUTD
1
V
REF
REGISTER
REGISTER
REGISTER
REGISTER
DAC B
DAC C
V
OUTC
INL (LSB)
V
CC
= 3V
INTERNAL REF
REF
Integral Nonlinearity
(LTC2634-LZ12)
DAC A
V
REF
V
OUTB
0
CS/LD
CONTROL
LOGIC
DECODE
SDI
SDI
–1
–2
SCK
(LDAC)
( ) QFN PACKAGE ONLY
32-BIT SHIFT REGISTER
POWER-ON
RESET
(CLR)
(SDO)
2634 BD
0
1024
2048
CODE
3072
4095
2634 TA01
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LTC2634
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) ................................... –0.3V to 6V
CS/LD,
SCK, SDI,
LDAC, CLR,
SDO, REFLO.. –0.3V to 6V
V
OUTA
-V
OUTD
.................... –0.3V to Min (V
CC
+ 0.3V, 6V)
REF .................................. –0.3V to Min (V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2634C ................................................ 0°C to 70°C
LTC2634I.............................................. –40°C to 85°C
LTC2634H (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)
MSOP ............................................................... 300°C
PIN CONFIGURATION
REFLO
TOP VIEW
GND
V
CC
NC
16 15 14 13
V
OUTA
1
V
OUTB
2
LDAC
3
CS/LD
4
5
SCK
6
NC
7
SDO
8
SDI
17
12 V
OUTD
11 V
OUTC
10 REF
9
CLR
V
CC
V
OUTA
V
OUTB
CS/LD
SCK
1
2
3
4
5
TOP VIEW
10
9
8
7
6
GND
V
OUTD
V
OUTC
REF
SDI
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 35°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
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LTC2634
ORDER INFORMATION
LTC2634 C
UD
-L
Z
12
#TR
PBF
LEAD FREE DESIGNATOR
PBF = Lead Free
TAPE AND REEL
TR = 2,500-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
UD = 16-Lead QFN
MSE = 10-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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LTC2634
PRODUCT SELECTION GUIDE
PART MARKING*
PART NUMBER
LTC2634-LMI12
LTC2634-LMI10
LTC2634-LMI8
LTC2634-LMX12
LTC2634-LMX10
LTC2634-LMX8
LTC2634-LZ12
LTC2634-LZ10
LTC2634-LZ8
LTC2634-HMI12
LTC2634-HMI10
LTC2634-HMI8
LTC2634-HMX12
LTC2634-HMX10
LTC2634-HMX8
LTC2634-HZ12
LTC2634-HZ10
LTC2634-HZ8
QFN
LDQX
LDRF
LDRN
LDQW
LDRD
LDRM
LDQV
LDRC
LDRK
LDRB
LDRJ
LDRR
LDQZ
LDRH
LDRQ
LDQY
LDRG
LDRP
MSOP
LTDRV
LTDSC
LTDSK
LTDRT
LTDSB
LTDSJ
LTDRS
LTDRZ
LTDSH
LTDRY
LTDSG
LTDSP
LTDRX
LTDSF
LTDSN
V
FS
WITH INTERNAL
POWER-ON
REFERENCE
RESET TO CODE
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
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
LTDRW 4.096V • (4095/4096)
LTDSD 4.096V • (1023/1024)
LTDSM 4.096V • (255/256)
*Above options are available in a 16-lead QFN package (LTC2634-UD) or 10-lead MSOP package (LTC2634-MSE).
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LTC2634
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
DC Performance
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 Ref. (Note 4)
V
CC
= 3V, Internal Ref. (Note 4)
V
CC
= 3V, Internal Ref. (Note 4)
V
CC
= 3V, Internal Ref., Code = 0
V
CC
= 3V, Internal Ref. (Note 5)
V
CC
= 3V, Internal Ref.
V
CC
= 3V, Internal Ref.
V
CC
= 3V, Internal Ref. (Note 10)
C-Grade
I-Grade
H-Grade
Internal Ref., Mid-Scale
V
CC
= 3V ±10%, –5mA ≤ I
OUT
≤ 5mA
Internal Ref., Mid-Scale
V
CC
= 5V ±10%, –10mA ≤ I
OUT
≤ 10mA
R
OUT
DC Output Impedance
Internal Ref., Mid-Scale
V
CC
= 3V ±10%, –5mA ≤ I
OUT
≤ 5mA
Internal Ref., Mid-Scale
V
CC
= 5V ±10%, –10mA ≤ I
OUT
≤ 10mA
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
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
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.
LTC2634-LMI12/-LMI10/-LMI8/-LMX12/-LMX10/-LMX8/-LZ12/-LZ10/-LZ8 (V
FS
= 2.5V)
CONDITIONS
LTC2634-8
LTC2634-10
LTC2634-12
MIN TYP MAX MIN TYP MAX MIN TYP MAX
8
8
±0.5
±0.05 ±0.5
0.5
±0.5
±10
±0.2 ±0.8
10
10
10
0.009 0.016
0.009 0.016
0.09 0.156
0.09 0.156
5
±5
±0.2
0.5
±0.5
±10
±0.2 ±0.8
10
10
10
0.035 0.064
0.035 0.064
0.09 0.156
0.09 0.156
MIN
TYP
0 to V
REF
0 to 2.5
–80
27
–27
2.7
0.5
0.6
0.6
0.7
0.5
0.5
48
–48
5.5
0.7
0.8
0.8
0.9
10
15
10
10
±0.5
±1
5
±5
±1
0.5
±0.5
±10
±0.2 ±0.8
10
10
10
12
12
±1
±2.5
5
±5
UNITS
Bits
Bits
LSB
LSB
mV
mV
μV/°C
%FSR
ppm/°C
ppm/°C
ppm/°C
Load Regulation
0.14 0.256 LSB/mA
0.14 0.256 LSB/mA
0.09 0.156
0.09 0.156
MAX
Ω
Ω
UNITS
V
V
dB
mA
mA
V
mA
mA
mA
mA
μA
μA
Power Supply
V
CC
I
CC
I
SD
Supply Current in Power-Down Mode (Note 7) V
CC
= 5V, C-Grade, I-Grade
V
CC
= 5V, H-Grade
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PCB Design
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