LTC2632
Dual 12-/10-/8-Bit SPI
V
OUT
DACs with
10ppm/°C Reference
FEATURES
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DESCRIPTION
The
LTC
®
2632
is a family of dual 12-, 10-, and 8-bit
voltage-output DACs with an integrated, high-accuracy,
low-drift reference in an 8-lead TSOT-23 package. It has
rail-to-rail output buffers and is guaranteed monotonic.
The LTC2632-L has a full-scale output of 2.5V, and oper-
ates from a single 2.7V to 5.5V supply. The LTC2632-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 a simple SPI/MICROWIRE
compatible 3-wire serial interface which operates at clock
rates up to 50MHz. The LTC2632 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.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 5396245, 5859606, 6891433, and 6937178.
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Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2632-L)
4.096V Full-Scale 10ppm/°C (LTC2632-H)
Maximum INL Error: ±1.5LSB (LTC2632A-12)
Low Noise: 0.75mV
P-P
0.1Hz to 200kHz
Guaranteed Monotonic –40°C to 125°C Automotive
Temperature Range
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2632-L)
Low Power Operation 0.4mA at 3V
Power-On-Reset to Zero-Scale/Mid-Scale
Double-Buffered Data Latches
8-Lead ThinSOT™ Package
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
REF
Integral Nonlinearity (LTC2632A-LZ12)
2
V
CC
= 3V
INTERNAL REF
.
V
CC
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTA
DAC A
DAC B
V
OUTB
INL (LSB)
SDI
1
0
CS/LD
CONTROL
LOGIC
DECODE
–1
SCK
32-BIT SHIFT REGISTER
POWER-ON
RESET
–2
0
1024
2048
CODE
3072
4095
2632 TA01
2632 BD
Rev. C
Document Feedback
For more information
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1
LTC2632
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
SCK
CS/LD
REF
GND
1
2
3
4
8
7
6
5
SDI
V
CC
V
OUTB
V
OUTA
Supply Voltage (V
CC
) ................................... –0.3V to 6V
SCK, SDI ...................................................... –0.3V to 6V
CS/LD
(Note 10) ...............–0.3V to Min (V
CC
+ 0.3V, 6V)
V
OUTA
, V
OUTB
...................–0.3V to Min (V
CC
+ 0.3V, 6V)
REF ..................................–0.3V to Min (V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2632C ................................................ 0°C to 70°C
LTC2632H .......................................... –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C (NOTE 6),
θ
JA
= 195°C/W
ORDER INFORMATION
LTC2632 A
C
TS8 –L
Z
12
#TRM PBF
LEAD FREE DESIGNATOR
TAPE AND REEL
TR = 2,500-Piece Tape and Reel
TRM = 500-Piece Tape and Reel
RESOLUTION
12 = 12-Bit
10 = 10-Bit
8 = 8-Bit
POWER-ON RESET
I = Reset to Mid-Scale in Internal Reference Mode
X = Reset to Mid-Scale in External Reference Mode (2632-L Only)
Z = Reset to Zero-Scale in Internal Reference Mode
FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE
L = 2.5V
H = 4.096V
PACKAGE TYPE
TS8 = 8-Lead Plastic TSOT-23
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
H = Automotive Temperature Range (–40°C to 125°C)
ELECTRICAL GRADE (OPTIONAL)
A = ±1.5LSB Maximum INL (12-Bit)
PRODUCT PART NUMBER
Contact the factory for parts specified with wider operating temperature ranges.
Contact the factory for information on lead based finish parts.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. C
2
For more information
www.analog.com
LTC2632
PRODUCT SELECTION GUIDE
PART NUMBER
LTC2632A-LI12
LTC2632A-LX12
LTC2632A-LZ12
LTC2632A-HI12
LTC2632A-HZ12
LTC2632-LI12
LTC2632-LI10
LTC2632-LI8
LTC2632-LX12
LTC2632-LX10
LTC2632-LX8
LTC2632-LZ12
LTC2632-LZ10
LTC2632-LZ8
LTC2632-HI12
LTC2632-HI10
LTC2632-HI8
LTC2632-HZ12
LTC2632-HZ10
LTC2632-HZ8
PART MARKING*
LTFSJ
LTFSH
LTFSG
LTFSM
LTFSK
LTFSJ
LTFSQ
LTFSW
LTFSH
LTFSP
LTFSV
LTFSG
LTFSN
LTFST
LTFSM
LTFSS
LTFSY
LTFSK
LTFSR
LTFSX
V
FS
WITH INTERNAL
REFERENCE
2.5V • (4095/4096)
2.5V • (4095/4096)
2.5V • (4095/4096)
4.096V • (4095/4096)
4.096V • (4095/4096)
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)
POWER-ON
POWER-ON
RESET TO CODE REFERENCE MODE
Mid-Scale
Mid-Scale
Zero
Mid-Scale
Zero
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Mid-Scale
Zero
Zero
Zero
Mid-Scale
Mid-Scale
Mid-Scale
Zero
Zero
Zero
Internal
External
Internal
Internal
Internal
Internal
Internal
Internal
External
External
External
Internal
Internal
Internal
Internal
Internal
Internal
Internal
Internal
Internal
RESOLUTION
12-Bit
12-Bit
12-Bit
12-Bit
12-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
4.5V to 5.5V
4.5V 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
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
MAXIMUM INL
±1.5LSB
±1.5LSB
±1.5LSB
±1.5LSB
±1.5LSB
±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
* The temperature grade is identified by a label on the shipping container.
Above options are available in an 8-lead TSOT package (LTC2632xTS8).
Rev. C
For more information
www.analog.com
3
LTC2632
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
Load
Regulation
V
CC
= 3V, Internal Ref.
(Note 3)
V
CC
= 3V, Internal Ref.
(Note 3)
V
CC
= 3V, Internal Ref.
(Note 3)
V
CC
= 3V, Internal Ref.,
Code = 0
V
CC
= 3V, Internal Ref.
(Note 4)
V
CC
= 3V, Internal Ref.
V
CC
= 3V, Internal Ref.
V
CC
= 3V, Internal Ref.
(Note 9)
C-Grade
H-Grade
Internal Ref., Mid-Scale,
V
CC
= 3V±10%,
–5mA ≤ I
OUT
≤ 5mA
V
CC
= 5V±10%,
–10mA ≤ I
OUT
≤ 10mA
Internal Ref., Mid-Scale,
V
CC
= 3V±10%,
–5mA ≤ I
OUT
≤ 5mA
V
CC
= 5V±10%,
–10mA ≤ I
OUT
≤ 10mA
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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.
LTC2632-8
LTC2632-10
LTC2632-12
LTC2632A-12
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
8
8
±0.5
±0.05
0.5
±0.5
±10
±0.5
5
±5
±0.2
0.5
±0.5
±10
10
10
±0.5
±1
5
±5
±1
0.5
±0.5
±10
12
12
±1
±2.5
5
±5
±0.5
0.5
±0.5
±10
12
12
±1
±1.5
5
±5
LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (V
FS
= 2.5V)
CONDITIONS
UNITS
Bits
Bits
LSB
LSB
mV
mV
µV/°C
l
0.2
0.8
0.2
0.8
0.2
0.8
0.2
0.8
%FSR
10
10
0.009 0.016
0.009 0.016
10
10
0.035 0.064
0.035 0.064
10
10
0.14 0.256
0.14 0.256
10
10
ppm/°C
ppm/°C
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
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 5)
Sinking
Sourcing
Positive Supply Voltage
Supply Current (Note 6)
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
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
Power Supply
V
CC
I
CC
l
l
l
l
l
l
2.7
0.3
0.4
0.3
0.4
0.5
0.5
0.6
0.5
0.6
2
I
SD
Supply Current in Power-Down Mode
(Note 6)
Rev. C
4
For more information
www.analog.com
LTC2632
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Input Voltage Range
Resistance
Capacitance
I
REF
Reference Current, Power-Down Mode
Output Voltage
Reference Temperature Coefficient
Output Impedance
Capacitive Load Driving
Short-Circuit Current
Digital I/O
V
IH
V
IL
I
LK
C
IN
t
S
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Leakage
Digital Input Capacitance
Settling Time
V
CC
= 3.6V to 5.5V
V
CC
= 2.7V to 3.6V
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 4.5V
V
IN
= GND to V
CC
(Note 7)
V
CC
= 3V (Note 8)
±0.39% (±1LSB at 8 Bits)
±0.098% (±1LSB at 10 Bits)
±0.024% (±1LSB at 12 Bits)
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.
LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (V
FS
= 2.5V)
CONDITIONS
l
l
MIN
1
120
TYP
MAX
V
CC
UNITS
V
kΩ
pF
µA
V
ppm/°C
kΩ
µF
mA
V
V
Reference Input
160
12
DAC Powered Down
l
200
5.0
1.26
0.005
1.24
1.25
±10
0.5
10
Reference Output
l
V
CC
= 5.5V, REF Shorted to GND
2.4
2.0
2.5
0.8
0.6
±1
8
V
V
µA
pF
AC Performance
3.5
3.9
4.4
1.0
500
At Mid-Scale Transition
1 DAC Held at FS, 1 DAC Switch 0 to FS
External Reference
At f = 1kHz, External Reference
At f = 10kHz, External Reference
At f = 1kHz, Internal Reference
At f = 10kHz, Internal Reference
0.1Hz to 10Hz, External Reference
0.1Hz to 10Hz, Internal Reference
0.1Hz to 200kHz, External Reference
0.1Hz to 200kHz, Internal Reference
C
REF
= 0.1µF
2.8
4.5
320
180
160
200
180
30
35
680
730
µs
µs
µs
V/µs
pF
nV•s
nV•s
kHz
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
µV
P-P
µV
P-P
µV
P-P
µV
P-P
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse
DAC-to-DAC Crosstalk
Multiplying Bandwidth
e
n
Output Voltage Noise Density
Output Voltage Noise
Rev. C
For more information
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5
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