LTC2604/LTC2614/LTC2624
Quad 16-Bit Rail-to-Rail DACs
in 16-Lead SSOP
FEATURES
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DESCRIPTIO
s
s
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s
s
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Smallest Pin Compatible Quad 16-Bit DAC:
LTC2604: 16-Bits
LTC2614: 14-Bits
LTC2624: 12-Bits
Guaranteed 16-Bit Monotonic Over Temperature
Separate Reference Inputs for each DAC
Wide 2.5V to 5.5V Supply Range
Low Power Operation: 250µA per DAC at 3V
Individual DAC Power-Down to 1µA, Max
Ultralow Crosstalk Between DACs (<5µV)
High Rail-to-Rail Output Drive (±15mA)
Double Buffered Digital Inputs
16-Lead Narrow SSOP Package
The LTC
®
2604/LTC2614/LTC2624 are quad 16-,14- and
12-bit 2.5V to 5.5V rail-to-rail voltage output DACs in
16-lead narrow SSOP packages. These parts have sepa-
rate reference inputs for each DAC. They have built-in
high performance 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
TM
compatible
3-wire serial interface which can be operated at clock
rates up to 50MHz. Daisy-chain capability and a hardware
CLR function are included.
The LTC2604/LTC2614/LTC2624 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 Corp.
APPLICATIO S
s
s
s
s
Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
BLOCK DIAGRA
GND
1
REF LO
2
REF A
3
DAC
REGISTER
V
CC
16
REF D
15
INPUT
REGISTER
DAC
REGISTER
V
OUT D
DAC D
14
4
DAC A
INPUT
REGISTER
V
OUTA
INPUT
REGISTER
DAC
REGISTER
V
OUT C
13
REF C
12
CLR
11
ERROR (LSB)
DAC C
DAC
REGISTER
V
OUTB
5
REF B
6
CS/LD
7
SCK
8
DAC B
INPUT
REGISTER
CONTROL
LOGIC
DECODE
SDO
10
SDI
9
2604 BD
32-BIT SHIFT REGISTER
U
Differential Nonlinearity (LTC2604)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2604 TA01
W
U
V
CC
= 5V
V
REF
= 4.096V
2604f
1
LTC2604/LTC2614/LTC2624
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND
REF LO
REF A
V
OUT A
V
OUT B
REF B
CS/LD
SCK
1
2
3
4
5
6
7
8
16 V
CC
15 REF D
14 V
OUT D
13 V
OUT C
12 REF C
11 CLR
10 SDO
9
SDI
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
LTC2604/LTC2614/LTC2624C ............... 0°C to 70°C
LTC2604/LTC2614/LTC2624I ............ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
ORDER PART
NUMBER
LTC2604CGN
LTC2604IGN
LTC2614CGN
LTC2614IGN
LTC2624CGN
LTC2624IGN
GN PART MARKING
2604
2604I
2614
2614I
2624
2624I
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 150°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. REF A = REF B = REF C = REF D = 4.096V (V
CC
= 5V), REF A = REF B = REF C = REF D = 2.048V (V
CC
= 2.5V),
REF LO = 0V, V
OUT
unloaded, unless otherwise noted.
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
Differential Nonlinearity
INL
Integral Nonlinearity
Load Regulation
CONDITIONS
q
LTC2624
MIN TYP MAX
12
12
±0.5
±0.9 ±4
0.025 0.125
0.025 0.125
0.05
0.05
1.5
±1.5
±5
0.25
0.25
9
±9
LTC2614
MIN TYP MAX
14
14
±4
0.1
0.1
0.2
0.2
1.5
±1.5
±5
±1
±16
0.5
0.5
1
1
9
±9
LTC2604
MIN TYP MAX
16
16
±14
0.3
0.3
0.7
0.7
1.5
±1.5
±5
±1
±64
2
2
4
4
9
±9
UNITS
Bits
Bits
LSB
LSB
LSB/mA
LSB/mA
LSB/mA
LSB/mA
mV
mV
µV/°C
%FSR
ppm/°C
(Note 2)
(Note 2)
(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
(Note 7)
q
q
q
q
q
q
q
q
q
ZSE
V
OS
GE
Zero-Scale Error
Offset Error
V
OS
Temperature
Coefficient
Gain Error
Gain Temperature
Coefficient
q
±0.1 ±0.7
±5
±0.1 ±0.7
±5
±0.1 ±0.7
±5
SYMBOL
PSR
R
OUT
PARAMETER
Power Supply Rejection
DC Output Impedance
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
q
q
LTC2604/LTC2614/LTC2624
MIN
TYP
MAX
–80
–80
0.025
0.15
0.030
0.15
UNITS
dB
dB
Ω
Ω
2
U
2604f
W
U
U
W W
W
LTC2604/LTC2614/LTC2624
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. REF A = REF B = REF C = REF D = 4.096V (V
CC
= 5V), REF A = REF B = REF C = REF D = 2.048V (V
CC
= 2.5V),
REF LO = 0V, V
OUT
unloaded, unless otherwise noted.
SYMBOL
PARAMETER
DC Crosstalk (Note 4)
CONDITIONS
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
LTC2604/LTC2614/LTC2624
MIN
TYP
MAX
±5
±1
±3.5
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
UNITS
µV
µV/mA
µV
mA
mA
mA
mA
V
kΩ
pF
µA
V
mA
mA
µA
µA
V
V
V
V
V
V
µA
pF
I
SC
Short-Circuit Output Current
15
15
7.5
7.5
0
88
34
36
18
24
60
60
50
50
V
CC
160
1
5.5
2
1.6
1
1
Reference Input
Input Voltage Range
Resistance
Capacitance
I
REF
Reference Current, Power Down Mode
Power Supply
V
CC
Positive Supply Voltage
I
CC
Supply Current
Normal Mode
All DACs Powered Down
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
= 2.5V to 5.5V
Load Current = –100µA
Load Current = +100µA
V
IN
= GND to V
CC
(Note 6)
LTC2624
TYP MAX
7
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
128
14
0.001
2.5
1.3
1
0.35
0.10
2.4
2.0
Digital I/O
V
IH
Digital Input High Voltage
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
0.8
0.6
V
CC
– 0.4
0.4
±1
8
LTC2604
TYP MAX
7
9
10
2.7
4.8
5.2
0.80
1000
12
180
120
100
15
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
LTC2614
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
2604f
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
LTC2604/LTC2614/LTC2624
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. REF A = REF B = REF C = REF D = 4.096V (V
CC
= 5V), REF A = REF B = REF C = REF D = 2.048V (V
CC
= 2.5V),
REF LO = 0V, V
OUT
unloaded, unless otherwise noted.
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
SDO Propagation Delay from SCK Falling Edge
C
LOAD
= 10pF
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 5.5V
CONDITIONS
q
q
q
q
q
q
q
q
q
q
q
TI I G CHARACTERISTICS
V
CC
= 2.5V to 5.5V
4
4
9
9
10
7
7
20
45
20
7
50
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
t
9
t
10
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, 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
Current Limiting
0.10
0.08
0.06
0.04
CODE = MIDSCALE
V
REF
= V
CC
= 5V
V
REF
= V
CC
= 3V
∆V
OUT
(mV)
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
20
30
40
–1.0
–35
–25
–15
–5
5
I
OUT
(mA)
15
25
35
V
REF
= V
CC
= 3V
V
REF
= V
CC
= 5V
OFFSET ERROR (mV)
∆V
OUT
(V)
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
10
–40 –30 –20 –10 0
I
OUT
(mA)
V
REF
= V
CC
= 3V
V
REF
= V
CC
= 5V
4
U W
UW
LTC2604/LTC2614/LTC2624
MIN
TYP
MAX
UNITS
CLR Pulse Width
CS/LD High to SCK Positive Edge
SCK Frequency
50% Duty Cycle
q
Note 5:
R
L
= 2kΩ to GND or V
CC
.
Note 6:
Guaranteed by design and not production tested.
Note 7:
Inferred from measurement at code 256 (LTC2604), code 64
(LTC2614) or code 16 (LTC2624), and at full scale.
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 1LSB between half scale
and half scale –1. Load is 2k in parallel with 200pF to GND.
(LTC2604/LTC2614/LTC2624)
Load Regulation
1.0
0.8
0.6
2
1
0
–1
–2
CODE = MIDSCALE
3
Offset Error vs Temperature
–3
–50
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
2604 G01
2604 G02
2604 G03
2604f
LTC2604/LTC2614/LTC2624
TYPICAL PERFOR A CE CHARACTERISTICS
Zero-Scale Error vs Temperature
3
2.5
ZERO-SCALE ERROR (mV)
GAIN ERROR (%FSR)
2.0
1.5
1.0
0.5
0
–50
0.4
0.3
OFFSET ERROR (mV)
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
0.2
0.1
0
–0.1
–0.2
–0.3
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
–0.4
–50
–2
–3
2.5
Gain Error vs V
CC
0.4
0.3
0.2
GAIN ERROR (%FSR)
450
400
350
300
I
CC
(nA)
250
200
150
0.1
0
–0.1
–0.2
–0.3
–0.4
2.5
3
3.5
4
V
CC
(V)
4.5
Midscale Glitch Impulse
V
OUT
10mV/DIV
12nV-s TYP
V
OUT
(V)
CS/LD
5V/DIV
2604 G10
2.5µs/DIV
U W
2604 G04
(LTC2604/LTC2614/LTC2624)
Offset Error vs V
CC
3
2
1
0
–1
Gain Error vs Temperature
3
3.5
4
V
CC
(V)
4.5
5
5.5
2604 G06
2604 G05
I
CC
Shutdown vs V
CC
Large-Signal Settling
V
OUT
0.5V/DIV
V
REF
= V
CC
= 5V
1/4-SCALE TO 3/4-SCALE
2.5µs/DIV
2604 G09
100
50
5
5.5
2604 G07
0
2.5
3
3.5
4
V
CC
(V)
4.5
5
5.5
2604 G08
Power-On Reset Glitch
5.0
4.5
4.0
Headroom at Rails vs Output
Current
5V SOURCING
V
CC
1V/DIV
4mV PEAK
4mV PEAK
V
OUT
10mV/DIV
250µs/DIV
2604 G11
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
1
2
3
4 5 6
I
OUT
(mA)
7
8
9
10
3V SINKING
5V SINKING
3V SOURCING
2604 G12
2604f
5
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