LTC2602/LTC2612/LTC2622
Dual 16-/14-/12-Bit
Rail-to-Rail DACs in 8-Lead MSOP
FEATURES
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DESCRIPTIO
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s
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Smallest Pin-Compatible Dual DACs:
LTC2602: 16-Bits
LTC2612: 14-Bits
LTC2622: 12-Bits
Guaranteed 16-Bit Monotonic Over Temperature
Wide 2.5V to 5.5V Supply Range
Low Power Operation: 300µA per DAC at 3V
Individual Channel Power-Down to 1µA, Max
Ultralow Crosstalk between DACs (30µV)
High Rail-to-Rail Output Drive (±15mA)
Double-Buffered Data Latches
Pin-Compatible 10-Bit Version (LTC1661)
Tiny 8-Lead MSOP Package
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/MICROWIRE™ 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
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Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
BLOCK DIAGRA
LTC2602
REGISTER
REGISTER
REGISTER
REGISTER
Differential Nonlinearity (DNL)(LTC2602)
1.0
16-BIT
DAC B
5 V
OUT B
V
OUT A
8
16-BIT
DAC A
0.8
0.6
0.4
ERROR (LSB)
0.2
0
–0.2
–0.4
GND 7
6 V
CC
CS/LD 1
CONTROL
LOGIC
DECODE
4 REF
–0.6
–0.8
SCK 2
24-BIT SHIFT REGISTER
3 SDI
–1.0
2602 BD01
U
V
CC
= 5V
V
REF
= 4.096V
0
16384
32768
CODE
49152
65535
2602 TA01
W
U
2602f
1
LTC2602/LTC2612/LTC2622
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
CS/LD
SCK
SDI
REF
1
2
3
4
8
7
6
5
V
OUT A
GND
V
CC
V
OUT B
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 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 300°C/W
LTC2602CMS8
LTC2602IMS8
LTC2612CMS8
LTC2612IMS8
LTC2622CMS8
LTC2622IMS8
MS8 PART MARKING
LTACX
LTACY
LTACZ
LTADA
LTADB
LTADC
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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.
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
Differential Nonlinearity
Integral Nonlinearity
Load Regulation
V
CC
= 5V, V
REF
= 4.096V (Note 2)
V
CC
= 5V, V
REF
= 4.096V (Note 2)
V
CC
= 5V, V
REF
= 4.096V (Note 2)
V
REF
= V
CC
= 5V, Midscale
I
OUT
= 0mA to 15mA Sourcing
I
OUT
= 0mA to 15mA Sinking
V
REF
= V
CC
= 2.5V, Midscale
I
OUT
= 0mA to 7.5mA Sourcing
I
OUT
= 0mA to 7.5mA Sinking
ZSE
V
OS
Zero-Scale Error
Offset Error
V
OS
Temperature
Coefficient
GE
Gain Error
Gain Temperature
Coefficient
V
CC
= 5V, V
REF
= 4.096V
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
12
12
LTC2622
TYP MAX
MIN
14
14
LTC2612
TYP MAX
MIN
16
16
LTC2602
TYP MAX
UNITS
Bits
Bits
±0.5
±0.75
±4
±3
0.1
0.2
0.2
0.4
1
±1
±5
±1
±16
0.5
0.5
1
1
9
±9
±12
0.4
0.65
0.9
1.3
1
±1
±5
±1
±64
2
2
4
4
9
±9
0.025 0.125
0.05 0.125
0.05
0.1
1
±1
±5
±0.1 ±0.7
±3
0.25
0.25
9
±9
LSB/mA
LSB/mA
LSB/mA
LSB/mA
mV
mV
µV/°C
%FSR
ppm/°C
V
CC
= 5V, V
REF
= 4.096V Code = 0
q
V
CC
= 5V, V
REF
= 4.096V, (Note 7)
q
±0.1 ±0.7
±3
±0.1 ±0.7
±3
2
U
LSB
LSB
2602f
W
U
U
W W
W
LTC2602/LTC2612/LTC2622
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.
SYMBOL
PSRR
R
OUT
PARAMETER
Power Supply Rejection Ratio
DC Output Impedance
DC Crosstalk (Note 4)
CONDITIONS
V
CC
= 5V
±10%
V
REF
= V
CC
= 5V, Midscale; –15mA
≤
I
OUT
≤
15mA
V
REF
= V
CC
= 2.5V, Midscale; –7.5mA
≤
I
OUT
≤
7.5mA
Due to Full Scale Output Change (Note 5)
Due to Load Current Change
Due to Powering Down (per Channel)
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 All DACs Powered Down
Positive Supply Voltage
Supply Current
For Specified Performance
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
All DACs Powered Down (Note 3) V
CC
= 5V
All DACs Powered Down (Note 3) V
CC
= 3V
V
CC
= 2.5V to 5.5V
V
CC
= 2.5V to 3.6V
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 5.5V
V
CC
= 2.5V to 5.5V
V
IN
= GND to V
CC
(Note 6)
LTC2622
TYP MAX
7
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
LTC2602/LTC2612/LTC2622
MIN
TYP
MAX
–80
0.05
0.05
±30
±16
±4
15
15
7.5
7.5
0
44
64
23
0.001
2.5
0.7
0.6
0.35
0.10
2.4
2.0
0.8
0.6
0.5
±1
8
LTC2602
TYP MAX
7
9
10
2.7
4.8
5.2
0.80
1000
12
180
120
100
15
1
5.5
1.3
1
1
1
34
38
20
28
60
60
50
50
V
CC
80
0.15
0.15
UNITS
dB
Ω
Ω
µV
µV/mA
µV
mA
mA
mA
mA
V
kΩ
pF
µA
V
mA
mA
µA
µA
V
V
V
V
V
µA
pF
I
SC
Short-Circuit Output Current
Normal Mode
q
Power Supply
q
q
q
q
q
Digital I/O
V
IH
V
IL
Digital Input High Voltage
Digital Input Low Voltage
q
q
q
q
q
q
q
I
LK
C
IN
Digital Input Leakage
Digital Input Capacitance
SYMBOL PARAMETER
AC Performance
t
s
Settling Time (Note 8)
CONDITIONS
±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)
MIN
MIN
LTC2612
TYP MAX
7
9
2.7
4.8
0.80
1000
12
180
120
100
15
MIN
UNITS
µs
µs
µs
µs
µs
µs
V/µs
pF
nV • s
kHz
nV/√Hz
nV/√Hz
µV
P-P
2602f
Settling Time for
1LSB Step (Note 9)
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse
Multiplying Bandwidth
Output Voltage Noise
Density
Output Voltage Noise
2.7
At Midscale Transition
At f = 1kHz
At f = 10kHz
0.1Hz to 10Hz
e
n
0.80
1000
12
180
120
100
15
3
LTC2602/LTC2612/LTC2622
TI I G CHARACTERISTICS
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
10
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
CS/LD High to SCK Positive Edge
SCK Frequency
50% Duty Cycle
V
CC
= 2.5V to 5.5V
q
q
q
q
q
q
q
q
q
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)
CONDITIONS
LTC2602/LTC2612/LTC2622
MIN
TYP
MAX
4
4
9
9
10
7
7
7
50
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
MHz
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.
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC2602)
Integral Nonlinearity (INL)
32
24
16
DNL (LSB)
INL (LSB)
8
0
–8
–16
–24
–32
0
16384
32768
CODE
49152
65535
2602 G20
V
CC
= 5V
V
REF
= 4.096V
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2602 G21
INL (LSB)
4
U W
UW
Note 5:
R
L
= 2kΩ 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.
Differential Nonlinearity (DNL)
1.0
0.8
0.6
0.4
0.2
16
8
0
–8
–16
–24
V
CC
= 5V
V
REF
= 4.096V
32
24
INL vs Temperature
V
CC
= 5V
V
REF
= 4.096V
INL (POS)
INL (NEG)
–32
–50
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
2602 G22
2602f
LTC2602/LTC2612/LTC2622
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC2602)
DNL vs Temperature
1.0
0.8
0.6
0.4
DNL (LSB)
0.2
0
–0.2
–0.4
–16
–0.6
–0.8
–1.0
–50
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
–24
–32
0
1
2
3
V
REF
(V)
4
5
2602 G24
V
CC
= 5V
V
REF
= 4.096V
DNL (POS)
INL (LSB)
0
–8
INL (NEG)
DNL (LSB)
DNL (NEG)
Settling to
±1LSB
V
OUT
100µV/DIV
9.7µs
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
(LTC2612)
Integral Nonlinearity (INL)
8
6
4
DNL (LSB)
INL (LSB)
2
0
–2
–4
–6
–8
0
4096
8192
CODE
12288
16383
2602 G28
V
CC
= 5V
V
REF
= 4.096V
U W
2602 G23
INL vs V
REF
32
24
16
8
INL (POS)
0.5
V
CC
= 5.5V
1.0
1.5
DNL vs V
REF
V
CC
= 5.5V
DNL (POS)
0
DNL (NEG)
–0.5
–1.0
–1.5
0
1
2
3
V
REF
(V)
4
5
2602 G25
Settling of Full-Scale Step
V
OUT
100µV/DIV
12.3µs
CS/LD
2V/DIV
2µs/DIV
2602 G26
5µs/DIV
V
CC
= 5V, V
REF
= 4.096V
CODE 512 TO 65535 STEP
AVERAGE OF 2048 EVENTS
SETTLING TO
±1LSB
2602 G27
Differential Nonlinearity (DNL)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
4096
8192
CODE
12288
16383
2602 G29
Settling to
±1LSB
V
CC
= 5V
V
REF
= 4.096V
V
OUT
100µV/DIV
CS/LD
2V/DIV
8.9µs
2µs/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
2602 G30
2602f
5
