FEATURES
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LTC1669
10-Bit Rail-to-Rail
Micropower DAC with
I
2
C Interface
DESCRIPTION
The LTC
®
1669 is a 10-bit voltage output DAC with true
buffered rail-to-rail output voltage capability. It operates
from a single supply with a range of 2.7V to 5.5V. The
reference for the DAC is selectable between the supply
voltage or an internal bandgap reference. Selecting the
internal bandgap reference will set the full-scale output
voltage range to 2.5V. Selecting the supply as the reference
sets the output voltage range to the supply voltage.
The part features a simple 2-wire serial interface compat-
ible with I
2
C that allows communication between many
devices. The internal data registers are double buffered to
allow for simultaneous update of several devices at once.
The DAC can be put in low current power-down mode for
use in power conscious systems.
Power-on reset ensures the DAC output is at 0V when
power is initially applied, and all internal registers are
cleared. The LTC1669 is pin-for-pin compatible with the
LTC1663.
For SMBus-compatible designs, please refer to the
LTC1663.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Micropower 10-Bit DAC in SOT-23
Low Operating Current: 60μA
Ultralow Power Shutdown Mode: 12μA
2-Wire Serial Interface Compatible
with I
2
C™
Selectable Internal Reference or Ratiometric to
V
CC
Maximum DNL Error: 0.75LSB
8 User Selectable Addresses (MSOP Package)
Single 2.7V to 5.5V Operation
Buffered True Rail-to-Rail Voltage Output
Power-On Reset
1.5V V
IL
and 2.1V V
IH
for SDA and SCL
Small 5-Lead TSOT-23 and 8-Lead MSOP Packages
APPLICATIONS
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Digital Calibration
Offset/Gain Adjustment
Industrial Process Control
Automatic Test Equipment
Arbitrary Function Generators
Battery-Powered Data Conversion Products
BLOCK DIAGRAM
4 (5)
V
CC
1.25V
BANDGAP
REFERENCE
Differential Nonlinearity (DNL)
1.0
0.8
V
REF
= V
CC
= 5V
T
A
= 25°C
REFERENCE
SELECT
ERROR (LSB)
10-BIT BUFFERED V
OUT
DAC
MSOP
PACKAGE
ONLY
(6) AD0
(2) AD1
(3) AD2
2-WIRE INTERFACE
SDA
1 (1)
SCL
5 (4)
GND
2 (7)
1669 BD
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
28
156 384 512 640 768 896 1024
CODE
1669 G02
10-BIT
DAC LATCH
V
OUT
3 (8)
COMMAND
LATCH
INPUT
LATCH
NOTE: PIN NUMBERS IN PARENTHESES REFER TO THE MSOP PACKAGE
1669fa
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LTC1669
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
CC
to GND .............................................. – 0.3V to 7.5V
SDA, SCL ................................................. –0.3V to 7.5V
AD0, AD1, AD2 (MSOP Only) ........–0.3V to (V
CC
+ 0.3V)
V
OUT
.............................................–0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC1669C ............................................... 0°C to 70°C
LTC1669I............................................. –40°C to 85°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
PIN CONFIGURATION
TOP VIEW
SDA
AD1
AD2
SCL
1
2
3
4
8
7
6
5
V
OUT
GND
AD0
V
CC
SDA 1
GND 2
V
OUT
3
4 V
CC
TOP VIEW
5 SCL
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 150°C/W
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 125°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1669CMS8#PBF
LTC1669IMS8#PBF
LTC1669-8CMS8#PBF
LTC1669-8IMS8#PBF
TAPE AND REEL (MINI)
LTC1669CS5#TRMPBF
LTC1669-1CS5#TRMPBF
TAPE AND REEL
LTC1669CMS8#TRPBF
LTC1669IMS8#TRPBF
LTC1669-8CMS8#TRPBF
LTC1669-8IMS8#TRPBF
TAPE AND REEL
LTC1669CS5#TRPBF
LTC1669-1CS5#TRPBF
PART MARKING
LTAHV
LTAHX
LTAHT
LTAHU
PART MARKING
LTAHW
LTAHR
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
TRM = 500 pieces.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on 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/
1669fa
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LTC1669
ELECTRICAL CHARACTERISTICS
SYMBOL
DAC
Resolution
Monotonicity
DNL
INL
V
OS
V
OSTC
FSE
V
OUT
V
FSTC
PSRR
Differential Nonlinearity
Integral Nonlinearity
Offset Error
Offset Error Temperature Coefficient
Full-Scale Error
DAC Output Span
Full-Scale Voltage Temperature
Coefficient
Power Supply Rejection Ratio
Reference Set to V
CC
Reference Set to Internal Bandgap
Reference Set to V
CC
Reference Set to Internal Bandgap
Reference Set to V
CC
Reference Set to Internal Bandgap
Reference Set to Internal Bandgap,
Code = 1023
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The
●
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
CC
set as reference, V
OUT
unloaded, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
10
10
± 0.2
±0.5
±10
±15
±3
±3
0 to V
CC
0 to 2.5
±30
±50
±0.4
±15
±15
±0.75
± 2.5
±30
TYP
MAX
UNITS
Bits
Bits
LSB
LSB
mV
μV/°C
LSB
LSB
V
V
μV/°C
μV/°C
LSB/V
(Note 2)
Guaranteed Monotonic (Note 2)
(Note 2)
Measured at Code 20
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Power Supply
V
CC
I
CC
I
SD
Positive Supply Voltage
Supply Current
Supply Current in Shutdown Mode
Short-Circuit Current (Sourcing)
Short-Circuit Current (Sinking)
Output Impedance to GND
V
CC
= 3V (Note 3)
V
CC
= 5V (Note 3)
(Note 3)
V
OUT
Shorted to GND, Input Code = 1023
V
OUT
Shorted to V
CC
, Input Code = 0
Input Code = 0, V
CC
= 5V
Input Code = 0, V
CC
= 5V
In Shutdown Mode
Input Code = 1023, V
CC
= 5V
Input Code = 1023, V
CC
= 5V
Rising (Notes 4, 5)
Falling (Notes 4, 5)
To ±0.5LSB (Notes 4, 5)
1LSB Change Around Major Carry
l
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2.7
60
75
12
25
30
65
150
500
80
120
0.75
0.25
30
0.75
70
2.1
5.5
100
125
24
100
120
V
μA
μA
μA
mA
mA
Ω
Ω
kΩ
Ω
Ω
V/μs
V/μs
μs
nV•s
nV•s
V
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Op Amp DC Performance
Output Impedance to V
CC
AC Performance
Voltage Output Slew Rate
Voltage Output Settling Time
Digital Feedthrough
Digital-to-Analog Glitch Impulse
Digital Inputs SCL, SDAs
V
IH
V
IL
V
LTH
I
LEAK
C
IN
V
OL
High Level Input Voltage
Low Level Input Voltage
Logic Threshold Voltage
Digital Input Leakage
Digital Input Capacitance
Digital Output Low Voltage
1.5
1.8
±1
10
0.4
V
V
μA
pF
V
V
CC
= 5.5V and 0V, V
IN
= GND to V
CC
(Note 7)
I
PULLUP
= 3mA
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Digital Output SDA
1669fa
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LTC1669
ELECTRICAL CHARACTERISTICS
SYMBOL
I
UP
V
IH
V
IL
PARAMETER
Address Pin Pull-Up Current
High Level Input Voltage
Low Level Input Voltage
Address Inputs AD0, AD1, AD2 (MSOP Only)
V
IN
= 0V
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The
●
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
CC
set as reference, V
OUT
unloaded, unless otherwise noted.
CONDITIONS
MIN
TYP
0.5
V
CC
– 0.3
0.8
MAX
1.5
UNITS
μA
V
V
The
●
denotes 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
CC
set as reference, V
OUT
unloaded, unless otherwise noted.
SYMBOL
f
SCL
t
BUF
t
HD, STA
t
SU, STA
t
SU, STO
t
HD, DAT (IN)
t
HD, DAT (OUT)
t
SU, DAT
t
LOW
t
HIGH
t
f
t
r
PARAMETER
Clock Operating Frequency
Bus Free Time Between Stop and Start Condition
Hold Time After (Repeated) Start Condition
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time (Input)
Data Hold Time (Output)
Data Setup Time
Clock Low Period
Clock High Period
Clock, Data Fall Time
Clock, Data Rise Time
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●
●
●
●
●
●
●
●
●
●
●
TIMING CHARACTERISTICS
Timing Characteristics (Notes 6, 7)
MIN
TYP
MAX
100
UNITS
kHz
μs
μs
μs
μs
ns
4.7
4
4.7
4
0
225
250
4.7
4
20
20
300
1000
500
3450
ns
ns
μs
μs
ns
ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Nonlinearity and monotonicity are defined from code 20 to code
1003 (full scale). See Applications Information.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Load is 10kΩ in parallel with 100pF
.
Note 5:
V
CC
= V
REF
= 5V. DAC switched between 0.1V
FS
and 0.9V
FS
,
i.e., codes k = 102 and k = 922.
Note 6:
All values are referenced to V
IH
and V
IL
levels.
Note 7:
Guaranteed by design and not subject to test.
1669fa
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LTC1669
TYPICAL PERFORMANCE CHARACTERISTICS
Integral Nonlinearity (INL)
1.0
0.8
0.6
0.4
ERROR (LSB)
ERROR (LSB)
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
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156 384 512 640 768 896 1024
CODE
1669 G01
Differential Nonlinearity (DNL)
1.0
5.0
V
REF
= V
CC
= 5V
T
A
= 25°C
OUTPUT VOLTAGE (V)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
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CODE
1669 G02
Source and Sink Current
Capability with V
CC
= 5V
T
A
= 25°C
DAC CODE = 1023
V
REF
= V
CC
= 5V
T
A
= 25°C
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
DAC CODE = 0
0
0
1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT SOURCE/SINK (mA)
1669 G03
Large-Signal Step Response
5
SDA
(VOLTS) 0
5
4
V
OUT
(VOLTS) 2
1
CODE = 32
0
5μs/DIV
1669 G04
Midscale Glitch
1.0
5V
SDA
0V
CODE = 512 TO 511
ΔV
OUT
(LSB)
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
Load Regulation vs Output Current
V
CC
= V
REF
= 5V
V
OUT
= 2.5V
CODE = 512
T
A
= 25°C
CODE = 990
V
CC
= 5V
R
L
= 4.7k
C
L
= 100pF
T
A
= 25°C
3
V
OUT
10mV/DIV
V
CC
= 5V
R
L
= 4.7k
C
L
= 100pF
T
A
= 25°C
2μs/DIV
1669 G05
SOURCE
SINK
–4
–3
–2
–1 0
1
I
OUT
(mA)
2
3
4
1669 G06
Load Regulation vs Output Current
1.0
0.8
0.6
0.4
ΔV
OUT
(LSB)
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0
I
OUT
(mA)
1669 G07
Offset Error Voltage vs
Temperature
5
2.510
2.508
2.506
OUTPUT VOLTAGE (V)
2.504
2.502
2.500
2.498
2.496
2.494
2.492
80
100
4
OFFSET ERROR VOLTAGE (mV)
3
2
1
0
–1
–2
–3
–4
–5
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
Full-Scale Output Voltage vs
Temperature
REFERENCE SET TO
INTERNAL BANDGAP
V
CC
= V
REF
= 3V
V
OUT
= 1.5V
CODE = 512
T
A
= 25°C
SOURCE
SINK
2.490
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80
100
1669 G08
1669 G09
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