1
LTC2602/LTC2612/LTC2622
2602f
V
OUT A
REF
CS/LD
SCK
V
OUT B
GND
V
CC
SDI
2602 BD01
8
1
2
4
3
5
7
6
16-BIT
DAC A
16-BIT
DAC B
DECODE
CONTROL
LOGIC
24-BIT SHIFT REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
BLOCK DIAGRA
W
Dual 16-/14-/12-Bit
Rail-to-Rail DACs in 8-Lead MSOP
The LTC
®
2602/LTC2612/LTC2622 are dual 16-,14- and
12-bit, 2.5V-to-5.5V rail-to-rail voltage-output DACs, in a
tiny 8-lead MSOP package. They have built-in high per-
formance output buffers and are guaranteed monotonic.
These parts establish advanced performance standards
for output drive, crosstalk and load regulation in single-
supply, voltage output multiples.
The parts use a simple SPI/MICROWIRETM compatible
3-wire serial interface which can be operated at clock
rates up to 50MHz.
The LTC2602/LTC2612/LTC2622 incorporate a power-
on reset circuit. During power-up, the voltage outputs
rise less than 10mV above zero scale, and after power-
up, they stay at zero scale until a valid write and update
take place.
s
Smallest Pin-Compatible Dual DACs:
LTC2602: 16-Bits
LTC2612: 14-Bits
LTC2622: 12-Bits
s
Guaranteed 16-Bit Monotonic Over Temperature
s
Wide 2.5V to 5.5V Supply Range
s
Low Power Operation: 300
µ
A per DAC at 3V
s
Individual Channel Power-Down to 1
µ
A, Max
s
Ultralow Crosstalk between DACs (30
µ
V)
s
High Rail-to-Rail Output Drive (
±
15mA)
s
Double-Buffered Data Latches
s
Pin-Compatible 10-Bit Version (LTC1661)
s
Tiny 8-Lead MSOP Package
s
Mobile Communications
s
Process Control and Industrial Automation
s
Instrumentation
s
Automatic Test Equipment
Differential Nonlinearity (DNL)(LTC2602)
, LTC and LT are registered trademarks of Linear Technology Corporation.
CODE
0
16384
32768
49152
65535
ERROR (LSB)
2602 TA01
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
V
CC
= 5V
V
REF
= 4.096V
LTC2602
MICROWIRE is a trademark of National Semiconductor Corporation.
2
LTC2602/LTC2612/LTC2622
2602f
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
ORDER PART
NUMBER
W
U
U
PACKAGE/ORDER I FOR ATIO
T
JMAX
= 125
°
C,
JA
= 300
°
C/W
(Note 1)
Any Pin to GND ........................................... 0.3V to 6V
Any Pin to V
CC ........................................................
6V to 0.3V
Maximum Junction Temperature ......................... 125
°
C
Operating Temperature Range
LTC2602C/LTC2612C/LTC2622C .......... 0
°
C to 70
°
C
LTC2602I/LTC2612I/LTC2622I .......... 40
°
C to 85
°
C
Storage Temperature Range ................ 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................ 300
°
C
MS8 PART MARKING
ELECTRICAL C
C
HARA TERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
1
2
3
4
CS/LD
SCK
SDI
REF
8
7
6
5
V
OUT A
GND
V
CC
V
OUT B
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
LTC2602CMS8
LTC2602IMS8
LTC2612CMS8
LTC2612IMS8
LTC2622CMS8
LTC2622IMS8
LTACX
LTACY
LTACZ
LTADA
LTADB
LTADC
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 2.5V to 5.5V, V
REF
V
CC
, V
OUT
unloaded, unless otherwise noted.
LTC2622
LTC2612
LTC2602
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
DC Performance
Resolution
q
12
14
16
Bits
Monotonicity
V
CC
= 5V, V
REF
= 4.096V (Note 2)
q
12
14
16
Bits
DNL
Differential Nonlinearity
V
CC
= 5V, V
REF
= 4.096V (Note 2)
q
±
0.5
±
1
±
1
LSB
INL
Integral Nonlinearity
V
CC
= 5V, V
REF
= 4.096V (Note 2)
q
±
0.75
±
4
±
3
±
16
±
12
±
64
LSB
Load Regulation
V
REF
= V
CC
= 5V, Midscale
I
OUT
= 0mA to 15mA Sourcing
q
0.025 0.125
0.1
0.5
0.4
2
LSB/mA
I
OUT
= 0mA to 15mA Sinking
q
0.05 0.125
0.2
0.5
0.65
2
LSB/mA
V
REF
= V
CC
= 2.5V, Midscale
I
OUT
= 0mA to 7.5mA Sourcing
q
0.05
0.25
0.2
1
0.9
4
LSB/mA
I
OUT
= 0mA to 7.5mA Sinking
q
0.1
0.25
0.4
1
1.3
4
LSB/mA
ZSE
Zero-Scale Error
V
CC
= 5V, V
REF
= 4.096V Code = 0
q
1
9
1
9
1
9
mV
V
OS
Offset Error
V
CC
= 5V, V
REF
= 4.096V, (Note 7)
q
±
1
±
9
±
1
±
9
±
1
±
9
mV
V
OS
Temperature
±
5
±
5
±
5
µ
V/
°
C
Coefficient
GE
Gain Error
V
CC
= 5V, V
REF
= 4.096V
q
±
0.1
±
0.7
±
0.1
±
0.7
±
0.1
±
0.7
%FSR
Gain Temperature
±
3
±
3
±
3
ppm/
°
C
Coefficient
3
LTC2602/LTC2612/LTC2622
2602f
ELECTRICAL C
C
HARA TERISTICS
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 2.5V to 5.5V, V
REF
V
CC
, V
OUT
unloaded, unless otherwise noted.
LTC2602/LTC2612/LTC2622
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PSRR
Power Supply Rejection Ratio
V
CC
= 5V
±
10%
80
dB
R
OUT
DC Output Impedance
V
REF
= V
CC
= 5V, Midscale; 15mA
I
OUT
15mA
q
0.05
0.15
V
REF
= V
CC
= 2.5V, Midscale; 7.5mA
I
OUT
7.5mA
q
0.05
0.15
DC Crosstalk (Note 4)
Due to Full Scale Output Change (Note 5)
±
30
µ
V
Due to Load Current Change
±
16
µ
V/mA
Due to Powering Down (per Channel)
±
4
µ
V
I
SC
Short-Circuit Output Current
V
CC
= 5.5V, V
REF
= 5.5V
Code: Zero Scale; Forcing Output to V
CC
q
15
34
60
mA
Code: Full Scale; Forcing Output to GND
q
15
38
60
mA
V
CC
= 2.5V, V
REF
= 2.5V
Code: Zero Scale; Forcing Output to V
CC
q
7.5
20
50
mA
Code: Full Scale; Forcing Output to GND
q
7.5
28
50
mA
Reference Input
Input Voltage Range
q
0
V
CC
V
Resistance
Normal Mode
q
44
64
80
k
Capacitance
23
pF
I
REF
Reference Current, Power Down Mode
All DACs Powered Down
q
0.001
1
µ
A
Power Supply
V
CC
Positive Supply Voltage
For Specified Performance
q
2.5
5.5
V
I
CC
Supply Current
V
CC
= 5V (Note 3)
q
0.7
1.3
mA
V
CC
= 3V (Note 3)
q
0.6
1
mA
All DACs Powered Down (Note 3) V
CC
= 5V
q
0.35
1
µ
A
All DACs Powered Down (Note 3) V
CC
= 3V
q
0.10
1
µ
A
Digital I/O
V
IH
Digital Input High Voltage
V
CC
= 2.5V to 5.5V
q
2.4
V
V
CC
= 2.5V to 3.6V
q
2.0
V
V
IL
Digital Input Low Voltage
V
CC
= 4.5V to 5.5V
q
0.8
V
V
CC
= 2.7V to 5.5V
q
0.6
V
V
CC
= 2.5V to 5.5V
q
0.5
V
I
LK
Digital Input Leakage
V
IN
= GND to V
CC
q
±
1
µ
A
C
IN
Digital Input Capacitance
(Note 6)
q
8
pF
LTC2622
LTC2612
LTC2602
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
AC Performance
t
s
Settling Time (Note 8)
±
0.024% (
±
1LSB at 12 Bits)
7
7
7
µ
s
±
0.006% (
±
1LSB at 14 Bits)
9
9
µ
s
±
0.0015% (
±
1LSB at 16 Bits)
10
µ
s
Settling Time for
±
0.024% (
±
1LSB at 12 Bits)
2.7
2.7
2.7
µ
s
1LSB Step (Note 9)
±
0.006% (
±
1LSB at 14 Bits)
4.8
4.8
µ
s
±
0.0015% (
±
1LSB at 16 Bits)
5.2
µ
s
Voltage Output Slew Rate
0.80
0.80
0.80
V/
µ
s
Capacitive Load Driving
1000
1000
1000
pF
Glitch Impulse
At Midscale Transition
12
12
12
nV · s
Multiplying Bandwidth
180
180
180
kHz
e
n
Output Voltage Noise
At f = 1kHz
120
120
120
nV/
Hz
Density
At f = 10kHz
100
100
100
nV/
Hz
Output Voltage Noise
0.1Hz to 10Hz
15
15
15
µ
V
P-P
4
LTC2602/LTC2612/LTC2622
2602f
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
(LTC2602)
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
INL vs Temperature
CODE
0
16384
32768
49152
65535
INL (LSB)
2602 G20
32
24
16
8
0
8
16
24
32
V
CC
= 5V
V
REF
= 4.096V
CODE
0
16384
32768
49152
65535
DNL (LSB)
2602 G21
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
V
CC
= 5V
V
REF
= 4.096V
TEMPERATURE (
°
C)
50
30
10
10
30
50
70
90
INL (LSB)
2602 G22
32
24
16
8
0
8
16
24
32
V
CC
= 5V
V
REF
= 4.096V
INL (POS)
INL (NEG)
TI I G CHARACTERISTICS
U
W
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25
°
C. (See Figure 1) (Note 6)
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
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: DC crosstalk is measured with V
CC
= 5V and V
REF
= 4.096V, with
the measured DAC at midscale, unless otherwise noted.
Note 5: R
L
= 2k
to GND or V
CC
at the output of the DAC not being tested.
Note 6: Guaranteed by design and not production tested.
Note 7: Inferred from measurement at code 256 (LTC2602), code 64
(LTC2612) or code 16 (LTC2622), and at fullscale.
Note 8: V
CC
= 5V, V
REF
= 4.096V. DAC is stepped 1/4 scale to 3/4 scale
and 3/4 scate to 1/4 scale. Load is 2k in parallel with 200pF to GND.
Note 9: V
CC
= 5V, V
REF
= 4.096V. DAC is stepped
±
LBS between half scale
and half scale 1. Load is 2k in parallel with 200pF to GND.
LTC2602/LTC2612/LTC2622
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
= 2.5V to 5.5V
t
1
SDI Valid to SCK Setup
q
4
ns
t
2
SDI Valid to SCK Hold
q
4
ns
t
3
SCK High Time
q
9
ns
t
4
SCK Low Time
q
9
ns
t
5
CS/LD Pulse Width
q
10
ns
t
6
LSB SCK High to CS/LD High
q
7
ns
t
7
CS/LD Low to SCK High
q
7
ns
t
10
CS/LD High to SCK Positive Edge
q
7
ns
SCK Frequency
50% Duty Cycle
q
50
MHz
5
LTC2602/LTC2612/LTC2622
2602f
Integral Nonlinearity (INL)
CODE
0
4096
8192
12288
16383
INL (LSB)
2602 G28
8
6
4
2
0
2
4
6
8
V
CC
= 5V
V
REF
= 4.096V
(LTC2602)
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
DNL vs Temperature
INL vs V
REF
DNL vs V
REF
Settling to
±
1LSB
Settling of Full-Scale Step
TEMPERATURE (
°
C)
50
30
10
10
30
50
70
90
DNL (LSB)
2602 G23
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
V
CC
= 5V
V
REF
= 4.096V
DNL (POS)
DNL (NEG)
V
REF
(V)
0
1
2
3
4
5
INL (LSB)
2602 G24
32
24
16
8
0
8
16
24
32
V
CC
= 5.5V
INL (POS)
INL (NEG)
V
REF
(V)
0
1
2
3
4
5
DNL (LSB)
2602 G25
1.5
1.0
0.5
0
0.5
1.0
1.5
V
CC
= 5.5V
DNL (POS)
DNL (NEG)
2
µ
s/DIV
2602 G26
V
OUT
100
µ
V/DIV
CS/LD
2V/DIV
V
CC
= 5V, V
REF
= 4.096V
1/4-SCALE TO 3/4-SCALE STEP
R
L
= 2k, C
L
= 200pF
AVERAGE OF 2048 EVENTS
9.7
µ
s
5
µ
s/DIV
2602 G27
V
OUT
100
µ
V/DIV
CS/LD
2V/DIV
V
CC
= 5V, V
REF
= 4.096V
CODE 512 TO 65535 STEP
AVERAGE OF 2048 EVENTS
SETTLING TO
±
1LSB
12.3
µ
s
(LTC2612)
Differential Nonlinearity (DNL)
Settling to
±
1LSB
CODE
0
4096
8192
12288
16383
DNL (LSB)
2602 G29
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
V
CC
= 5V
V
REF
= 4.096V
2
µ
s/DIV
2602 G30
V
OUT
100
µ
V/DIV
CS/LD
2V/DIV
V
CC
= 5V, V
REF
= 4.096V
1/4-SCALE TO 3/4-SCALE STEP
R
L
= 2k, C
L
= 200pF
AVERAGE OF 2048 EVENTS
8.9
µ
s
PDF 
ZIP