12-bit, 2.5V-to-5.5V rail-to-rail voltage output DACs in a
10-lead DFN package. They have built-in high performance
output buffers and are guaranteed monotonic.
These parts establish new board-density benchmarks for
16- and 14-bit DACs and advance performance standards
for output drive and load regulation in single-supply, volt-
age-output DACs.
The parts use a simple SPI/MICROWIRE compatible 3-wire
serial interface which can be operated at clock rates up to
50MHz. Daisy-chain capability, hardware
CLR
and asyn-
chronous DAC update (LDAC) pins are included.
The LTC2601/LTC2611/LTC2621 incorporate a power-on
reset circuit. During power-up, the voltage outputs rise
less than 10mV above zero scale until a valid write and
update take place. The power-on reset circuit resets the
LTC2601-1/LTC2611-1/LTC2621-1 to midscale. The volt-
age outputs stay at midscale until a valid write and update
take place.
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.
n
n
n
n
n
n
n
n
n
Smallest Pin-Compatible Single DACs:
LTC2601: 16 Bits
LTC2611: 14 Bits
LTC2621: 12 Bits
Guaranteed Monotonic Over Temperature
Wide 2.5V to 5.5V Supply Range
Low Power Operation: 300μA at 3V
Power Down to 1μA, Max
High Rail-to-Rail Output Drive (±15mA, Min)
Double-Buffered Data Latches
Asynchronous DAC Update Pin
LTC2601-1/LTC2611-1/LTC2621-1: Power-On Reset
to Midscale
Tiny (3mm
×
3mm) 10-Lead DFN Package
APPLICATIONS
n
n
n
n
Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
TYPICAL APPLICATION
6
2
SDI
REF
9
V
CC
Differential Nonlinearity (LTC2601)
1.0
0.8
0.6
V
CC
= 5V
V
REF
= 4.096V
3
SCK
DNL (LSB)
0.4
0.2
0
–0.2
–0.4
–0.6
32-BIT
SHIFT
REGISTER
INPUT
REGISTER
DAC
REGISTER
12-/14-/16-BIT DAC
V
OUT
7
5
CS/LD
CONTROL
DECODE
LOGIC
SDO
LDAC
10
CLR
4
GND
8
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2600 TA01b
1
2601 TA01a
2601fb
1
LTC2601/LTC2611/LTC2621
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
SDO
SDI
SCK
CLR
CS/LD
1
2
3
4
5
11
10
LDAC
9 V
CC
8 GND
7 V
OUT
6 REF
Any Pin to GND ............................................ –0.3V to 6V
Any Pin to V
CC
.............................................. –6V to 0.3V
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
Operating Temperature Range:
LTC2601C/LTC2611C/LTC2621C
LTC2601C-1/LTC2611C-1/LTC2621C-1 .... 0°C to 70°C
LTC2601I/LTC2611I/LTC2621I
LTC2601I-1/LTC2611I-1/LTC2621I-1.... –40°C to 85°C
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2601CDD#PBF
LTC2601IDD#PBF
LTC2611CDD#PBF
LTC2611IDD#PBF
LTC2621CDD#PBF
LTC2621IDD#PBF
LTC2601CDD-1#PBF
LTC2601IDD-1#PBF
LTC2611CDD-1#PBF
LTC2611IDD-1#PBF
LTC2621CDD-1#PBF
LTC2621IDD-1#PBF
LEAD BASED FINISH
LTC2601CDD
LTC2601IDD
LTC2611CDD
LTC2611IDD
LTC2621CDD
LTC2621IDD
LTC2601CDD-1
LTC2601IDD-1
LTC2611CDD-1
LTC2611IDD-1
LTC2621CDD-1
LTC2621IDD-1
TAPE AND REEL
LTC2601CDD#TRPBF
LTC2601IDD#TRPBF
LTC2611CDD#TRPBF
LTC2611IDD#TRPBF
LTC2621CDD#TRPBF
LTC2621IDD#TRPBF
LTC2601CDD-1#TRPBF
LTC2601IDD-1#TRPBF
LTC2611CDD-1#TRPBF
LTC2611IDD-1#TRPBF
LTC2621CDD-1#TRPBF
LTC2621IDD-1#TRPBF
TAPE AND REEL
LTC2601CDD#TR
LTC2601IDD#TR
LTC2611CDD#TR
LTC2611IDD#TR
LTC2621CDD#TR
LTC2621IDD#TR
LTC2601CDD-1#TR
LTC2601IDD-1#TR
LTC2611CDD-1#TR
LTC2611IDD-1#TR
LTC2621CDD-1#TR
LTC2621IDD-1#TR
PART MARKING*
LAGT
LAGT
LBFQ
LBFQ
LBFS
LBFS
LBZH
LBZH
LBZJ
LBZJ
LBZK
LBZK
PART MARKING*
LAGT
LAGT
LBFQ
LBFQ
LBFS
LBFS
LBZH
LBZH
LBZJ
LBZJ
LBZK
LBZK
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
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
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
2601fb
2
LTC2601/LTC2611/LTC2621
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
Integral Nonlinearity
Load Regulation
(Note 2)
(Note 2)
Differential Nonlinearity (Note 2)
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. REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded,
unless otherwise noted.
LTC2621/ LTC2621-1
CONDITIONS
MIN
12
12
±0.5
±0.8
0.03
0.04
0.06
0.08
1
±1.5
±5
l
LTC2611/ LTC2611-1
MIN
14
14
±1
±3
0.10
0.15
0.2
0.3
1
±1.5
±5
±16
0.5
0.5
1
1
9
±9
TYP
MAX
LTC2601/ LTC2601-1
MIN
16
16
±1
±13
0.45
0.60
0.9
1.2
1
±1.5
±5
±64
2
2
4
4
9
±9
TYP
MAX
UNITS
Bits
Bits
LSB
LSB
LSB/mA
LSB/mA
LSB/mA
LSB/mA
mV
mV
μV/°C
±0.7
%FSR
ppm/°C
TYP
MAX
±4
0.125
0.125
0.25
0.25
9
±9
V
REF
= V
CC
= 5V, Midscale
I
OUT
= 0mA to 15mA Sourcing
l
I
OUT
= 0mA to 15mA Sinking
l
V
REF
= V
CC
= 2.5V, Midscale
I
OUT
= 0mA to 7.5mA Sourcing
l
I
OUT
= 0mA to 7.5mA Sinking
l
ZSE
V
OS
Zero-Scale Error
Offset Error
V
OS
Temperature
Coefficient
Code = 0
(Note 5)
l
l
GE
Gain Error
Gain Temperature
Coefficient
±0.03
±2
±0.7
±0.1
±2
±0.7
±0.05
±2
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded, unless otherwise noted. (Note 8)
SYMBOL PARAMETER
PSR
R
OUT
I
SC
Power Supply Rejection
DC Output Impedance
Short-Circuit Output Current
CONDITIONS
V
CC
= 5V ±10%
V
CC
= 3V ±10%
V
REF
= V
CC
= 5V, Midscale; –15mA ≤ I
OUT
≤ 15mA
V
REF
= V
CC
= 2.5V, Midscale; –7.5mA ≤ I
OUT
≤ 7.5mA
V
CC
= 5.5V, V
REF
= 5.5V
Code: Zero Scale; Forcing Output to V
CC
Code: Full Scale; Forcing Output to GND
V
CC
= 2.5V, V
REF
= 2.5V
Code: Zero Scale; Forcing Output to V
CC
Code: Full Scale; Forcing Output to GND
Reference Input
Input Voltage Range
Resistance
Capacitance
I
REF
V
CC
I
CC
Reference Current, Power Down Mode DAC Powered Down
Positive Supply Voltage
Supply Current
For Specified Performance
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
DAC Powered Down (Note 3) V
CC
= 5V
DAC Powered Down (Note 3) V
CC
= 3V
V
CC
= 2.5V to 5.5V
V
CC
= 2.5V to 3.6V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
–80
–80
0.04
0.05
MAX
UNITS
dB
dB
0.15
0.15
60
60
50
50
VCC
Ω
Ω
mA
mA
mA
mA
V
kΩ
pF
μA
V
mA
mA
μA
μA
V
V
2601fb
15
15
7.5
7.5
0
88
35
39
20
27
Normal Mode
l
124
15
0.001
160
1
5.5
Power Supply
2.5
0.375
0.30
0.40
0.10
2.4
2.0
0.55
0.45
1
1
Digital I/O
V
IH
Digital Input High Voltage
3
LTC2601/LTC2611/LTC2621
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
IL
V
OH
V
OL
I
LK
C
IN
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input Leakage
Digital Input Capacitance
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded,
unless otherwise noted. (Note 8)
CONDITIONS
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 5.5V
Load Current = –100μA
Load Current = +100μA
V
IN
= GND to V
CC
(Note 4)
l
l
l
l
l
l
MIN
TYP
MAX
0.8
0.6
UNITS
V
V
V
V
μA
pF
V
CC
– 0.4
0.4
±1
8
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded, unless otherwise noted.
LTC2621/ LTC2621-1
SYMBOL PARAMETER
AC Performance
t
S
Settling Time (Note 6)
±0.024% (±1LSB at 12 Bits)
±0.006% (±1LSB at 14 Bits)
±0.0015% (±1LSB at 16 Bits)
±0.024% (±1LSB at 12 Bits)
±0.006% (±1LSB at 14 Bits)
±0.0015% (±1LSB at 16 Bits)
7
7
9
2.7
4.8
0.80
1000
12
180
120
100
15
7
9
10
2.7
4.8
5.2
0.80
1000
12
180
120
100
15
μs
μs
μs
μs
μs
μs
V/μs
pF
nV • s
kHz
nV/√Hz
nV/√Hz
μV
P-P
CONDITIONS
MIN
TYP
MAX
LTC2611/ LTC2611-1
MIN
TYP
MAX
LTC2601/ LTC2601-1
MIN
TYP
MAX
UNITS
Settling Time for 1LSB Step
(Note 7)
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse
Multiplying Bandwidth
e
n
Output Voltage Noise
Density
Output Voltage Noise
2.7
0.80
1000
At Midscale Transition
At f = 1kHz
At f = 10kHz
0.1Hz to 10Hz
12
180
120
100
15
TIMING CHARACTERISTICS
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
PARAMETER
SDI Valid to SCK Setup
SDI Valid to SCK Hold
SCK High Time
SCK Low Time
CS/LD
Pulse Width
LSB SCK High to
CS/LD
High
CS/LD
Low to SCK High
V
CC
= 2.5V to 5.5V
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1) (Notes 4, 8)
CONDITIONS
l
l
l
l
l
l
l
MIN
4
4
9
9
10
7
7
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
SDO Propagation Delay from SCK Falling Edge
C
LOAD
= 10pF
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 5.5V
l
l
l
l
l
l
20
45
20
7
15
200
50
ns
ns
ns
ns
ns
ns
MHz
2601fb
t
9
t
10
t
12
t
13
CLR
Pulse Width
CS/LD
High to SCK Positive Edge
LDAC Pulse Width
CS/LD
High to
LDAC
High or Low Transition
SCK Frequency
50% Duty Cycle
l
4
LTC2601/LTC2611/LTC2621
TIMING CHARACTERISTICS
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:
Linearity and monotonicity are defined from code K
L
to code
2
N
– 1, where N is the resolution and K
L
is given by K
L
= 0.016(2
N
/V
REF
),
rounded to the nearest whole code. For V
REF
= 4.096V and N = 16, K
L
=
256 and linearity is defined from code 256 to code 65,535.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Guaranteed by design and not production tested.
Note 5:
Inferred from measurement at code K
L
= 0.016(2
N
/V
REF
) and at
full scale.
Note 6:
V
CC
= 5V, V
REF
= 4.096V. DAC is stepped 1/4 scale to 3/4 scale and
3/4 scale to 1/4 scale. Load is 2k in parallel with 200pF to GND.
Note 7:
V
CC
= 5V, V
REF
= 4.096V. DAC is stepped ±1LSB between half scale
and half scale – 1. Load is 2k in parallel with 200pF to GND.
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Embedded System
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