LTC1659
12-Bit Rail-to-Rail
Micropower DAC in
MSOP Package
DESCRIPTION
The LTC
®
1659 is a single supply, rail-to-rail voltage out-
put, 12-bit digital-to-analog converter (DAC) in an MSOP
package. It includes a rail-to-rail output buffer amplifier
and an easy-to-use 3-wire cascadable serial interface.
The LTC1659 output swings from 0V to REF. The REF input
can be tied to V
CC
which can range from 2.7V to 5.5V. This
allows a rail-to-rail output swing from 0V to V
CC
. The
LTC1659 draws only 250µA from a 5V supply.
Its guaranteed
±0.5LSB
maximum DNL makes the LTC1659
excel in calibration, control and trim/adjust applications.
The low power supply current and the small MSOP pack-
age make the LTC1659 ideal for battery-powered applica-
tions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
8-Lead MSOP Package
12-Bit Resolution
Supply Operation: 3V to 5V
Buffered True Rail-to-Rail Voltage Output
Output Swings from 0V to V
REF
V
REF
Can Tie to V
CC
Schmitt Trigger On Clock Input Allows Direct
Optocoupler Interface
Power-On Reset Clears DAC to 0V
3-Wire Cascadable Serial Interface
Maximum DNL Error: 0.5LSB
Low Cost
APPLICATIONS
s
s
s
s
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Cellular Telephones
TYPICAL APPLICATION
Functional Block Diagram: 12-Bit Rail-to-Rail DAC
2.7V TO 5.5V
8
V
CC
2 D
IN
1 CLK
µP
3 CS/LD
12-BIT
SHIFT
REG
AND
DAC
LATCH
6
REF
0.5
+
12-BIT
DAC
V
OUT
7
–
DNL ERROR (LSB)
RAIL-TO-RAIL
VOLTAGE
OUTPUT
4 D
OUT
TO
OTHER
DACS
POWER-ON
RESET
GND
5
1659 TA01
U
U
U
Differential Nonlinearity
vs Input Code
0
–0.5
0
512 1024 1536 2048 2560 3072 3584 4095
CODE
1659 TA02
1
LTC1659
ABSOLUTE
MAXIMUM
RATINGS
V
CC
to GND ...............................................– 0.5V to 7.5V
Logic Inputs to GND .................................– 0.5V to 7.5V
V
OUT
............................................... – 0.5V to V
CC
+ 0.5V
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Operating Temperature Range
LTC1659CS8 ........................................... 0°C to 70°C
LTC1659IS8 ....................................... – 40°C to 85°C
LTC1659CMS8 (Note 1) .......................... 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CLK 1
D
IN
2
CS/LD 3
D
OUT
4
8
7
6
5
V
CC
V
OUT
REF
GND
ORDER PART
NUMBER
LTC1659CS8
LTC1659IS8
S8 PART MARKING
1659
1659I
CLK
D
IN
CS/LD
D
OUT
1
2
3
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
V
CC
= 2.7V to 5.5V, V
OUT
unloaded, REF
≤
V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
DAC
Resolution
Monotonicity
DNL
INL
V
OS
V
OS
TC
V
FS
V
FS
TC
Differential Nonlinearity
Integral Nonlinearity
Offset Error
Offset Error Temperature
Coefficient
Full-Scale Voltage
Full-Scale Voltage
Temperature Coefficient
T
A
= 25°C, REF = 4.096V (Note 6)
REF = 4.096V (Note 6)
q
q
q
PARAMETER
CONDITIONS
V
REF
≤
V
CC
– 0.1V (Note 2)
V
REF
≤
V
CC
– 0.1V (Note2), T
A
= 25°C
V
REF
≤
V
CC
– 0.1V (Note 2)
Measured at Code 20, T
A
= 25°C
Measured at Code 20
2
U
U
W
W W
U
W
TOP VIEW
8
7
6
5
V
CC
V
OUT
REF
GND
ORDER PART
NUMBER
LTC1659CMS8
MS8 PART MARKING
LTCK
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 206°C/W
MIN
12
12
TYP
MAX
UNITS
Bits
Bits
q
q
q
±0.5
±5.0
±5.5
±12
±18
±15
4.070
4.060
4.095
4.095
10
4.120
4.130
LSB
LSB
LSB
mV
mV
µV/°C
V
V
ppm/°C
LTC1659
ELECTRICAL CHARACTERISTICS
V
CC
= 2.7V to 5.5V, V
OUT
unloaded, REF
≤
V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
V
CC
I
CC
PARAMETER
Positive Supply Voltage
Supply Current
Short-Circuit Current Low
Short-Circuit Current High
Output Impedance to GND
Output Line Regulation
AC Performance
Voltage Output Slew Rate
Voltage Output Settling Time
Digital Feedthrough
Reference Input
R
IN
REF
Digital I/O
V
IH
V
IL
V
OH
V
OL
V
IH
V
IL
V
OH
V
OL
I
LEAK
C
IN
Digital Input High Voltage
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input High Voltage
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input Leakage
Digital Input Capacitance
V
CC
= 5V
V
CC
= 5V
V
CC
= 5V, I
OUT
= – 1mA, D
OUT
Only
V
CC
= 5V, I
OUT
= 1mA, D
OUT
Only
V
CC
= 3V
V
CC
= 3V
V
CC
= 3V, I
OUT
= – 1mA, D
OUT
Only
V
CC
= 3V, I
OUT
= 1mA, D
OUT
Only
V
IN
= GND to V
CC
(Note 7)
q
q
q
q
q
q
q
q
q
q
CONDITIONS
For Specified Performance
(Note 5)
V
OUT
Shorted to GND
V
OUT
Shorted to V
CC
Input Code = 0
Input Code = 4095, V
CC
= 4.5V to 5.5V
(Note 3)
(Notes 3, 4) to
±0.5LSB
q
q
q
MIN
2.7
TYP
MAX
5.5
UNITS
V
µA
mA
mA
Ω
LSB/V
V/µs
µs
nV • s
Power Supply
240
70
65
40
0.1
0.5
1.0
14
0.3
q
450
120
120
150
1.5
Op Amp DC Performance
q
q
q
REF Input Resistance
REF Input Range
(Notes 6, 7)
17
0
2.4
28
40
V
CC
kΩ
V
V
q
0.8
V
CC
– 1.0
0.4
2.0
0.6
V
CC
– 0.7
0.4
±10
10
V
V
V
V
V
V
V
µA
pF
3
LTC1659
ELECTRICAL CHARACTERISTICS
V
CC
= 2.7V to 5.5V, V
OUT
unloaded, REF
≤
V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
PARAMETER
D
IN
Valid to CLK Setup
D
IN
Valid to CLK Hold
CLK High Time
CLK Low Time
CS/LD Pulse Width
LSB CLK to CS/LD
CS/LD Low to CLK
D
OUT
Output Delay
CLK Low to CS/LD Low
D
IN
Valid to CLK Setup
D
IN
Valid to CLK Hold
CLK High Time
CLK Low Time
CS/LD Pulse Width
LSB CLK to CS/LD
CS/LD Low to CLK
D
OUT
Output Delay
CLK Low to CS/LD Low
(Note 7)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
C
LOAD
= 15pF
(Note 7)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
C
LOAD
= 15pF
(Note 7)
CONDITIONS
q
q
q
q
q
q
q
q
q
MIN
40
0
40
40
50
40
20
5
20
60
0
60
60
80
60
30
10
30
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
Switching (V
CC
= 4.5 to 5.5V)
150
ns
ns
ns
ns
ns
ns
ns
ns
ns
Switching (V
CC
= 2.7 to 5.5V)
q
q
q
q
q
q
q
q
q
220
ns
ns
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
The LTC1659CMS8 is designed, characterized and expected to
meet industrial temperature limits, but is not tested at – 40°C and 85°C.
Consult factory for guaranteed I-grade MSOP parts. However, these parts
are guaranteed for commercial temperature limits of 0°C to 70°C.
Note 2:
Nonlinearity is defined from code 20 to code 4095 (full scale). See
Applications Information.
Note 3:
Load is 5kΩ in parallel with 100pF.
Note 4:
DAC switched between all 1s and the code corresponding to V
OS
for the part.
Note 5:
Digital inputs at 0V or V
CC
.
Note 6:
V
OUT
can only swing from (GND +
V
OS
)
to (V
CC
–
V
OS
)
when
output is unloaded.
Note 7:
Guaranteed by design. Not subject to test.
4
LTC1659
TYPICAL PERFORMANCE CHARACTERISTICS
Integral Nonlinearity (INL)
5
4
3
DNL ERROR (LSB)
0.5
OUTPUT PULL-DOWN VOLTAGE (V)
INL ERROR (LSB)
2
1
0
–1
–2
–3
–4
–5
0
512 1824 1536 2048 2560 3072 3584 4095
CODE
LTC1659 • TPC01
Supply Headroom for
Full Output Swing vs Load Current
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5
10
LOAD CURRENT (mA)
15
LTC1659 • TPC04
SUPPLY CURRENT (mA)
∆
V
OUT
< 1 LSB
CODE = ALL 1s
V
OUT
= 4.095V
125°C
25°C
1.6
1.2
0.8
0.4
SUPPLY CURRENT (µA)
V
CC
– V
OUT
(V)
U W
–55°C
Differential Nonlinearity (DNL)
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
512 1024 1536 2048 2560 3072 3584 4095
CODE
LTC1659 • TPC02
Minimum Output Voltage
vs Output Sink Current
CODE = ALL ZEROS
V
CC
= 5V
0
125°C
25°C
–55°C
–0.5
0
5
10
OUTPUT SINK CURRENT (mA)
15
LTC1659 • TPC03
Supply Current
vs Logic Input Voltage
300
2
V
CC
= 5V
290
280
270
260
250
Supply Current vs Temperature
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
240
230
0
0
1
2
3
4
LOGIC INPUT VOLTAGE (V)
5
220
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (C)
LTC1659 • TPC06
LTC1659 • TPC05
5
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