LTC1664
Micropower Quad
10-Bit DAC
Features
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Description
The LTC
®
1664 integrates four accurate, serially addressable
10-bit digital-to-analog converters (DACs) in a tiny 16-pin
narrow SSOP package. Each buffered DAC draws just 59µA
total supply current, yet is capable of supplying DC output
currents in excess of 5mA and reliably driving capacitive
loads of up to 1000pF. Sleep mode further reduces total
supply current to 1µA.
Linear Technology’s proprietary, inherently monotonic
voltage interpolation architecture provides excellent lin-
earity while allowing for an exceptionally small external
form factor.
Ultralow supply current, power-saving sleep mode and
extremely compact size make the LTC1664 ideal for
battery-powered applications, while its ease of use, high
performance and wide supply range make it an excellent
choice as a general-purpose converter.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Tiny: 4 DACs in the Board Space of an SO-8
Micropower: 59µA per DAC Plus
1µA Sleep Mode for Extended Battery Life
Wide 2.7V to 5.5V Supply Range
Rail-to-Rail Voltage Outputs Drive 1000pF
Reference Range Includes Supply for Ratiometric
0V to V
CC
Output
Reference Input Impedance is Code-Independent
—Eliminates External Reference Buffer
Individually Addressable DACs
Differential Nonlinearity: ≤ ±0.75LSB Max
Pin-Compatible Octal Version Available (LTC1660)
applications
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Mobile Communications
Remote Industrial Devices
Automatic Calibration for Manufacturing
Portable Battery-Powered Instruments
Trim/Adjust Applications
Block Diagram
GND
V
OUT A
1
2
10-BIT
DAC A
10-BIT
DAC D
16 V
CC
5
V
OUT D
1.0
Differential Nonlinearity (DNL)
V
CC
= 5V
0.8 V
REF
= 4.096V
0.6
0.4
V
OUT B
3
LSB
11
10
9
1664 BD
10-BIT
DAC B
10-BIT
DAC C
4
V
OUT C
0.2
0
–0.2
–0.4
REF
CS/LD
SCK
6
7
8
CONTROL
LOGIC
ADDRESS
DECODER
–0.6
CLR
D
OUT
D
IN
–0.8
–1.0
0
256
512
CODE
768
1023
1664 G02
SHIFT REGISTER
1664fa
1
LTC1664
aBsolute maximum ratings
(Note 1)
pin conFiguration
TOP VIEW
GND
V
OUT A
V
OUT B
V
OUT C
V
OUT D
REF
CS/LD
SCK
1
2
3
4
5
6
7
8
16 V
CC
15 NC
14 NC
13 NC
12 NC
11
CLR
10 D
OUT
9
D
IN
V
CC
to GND .............................................. – 0.3V to 7.5V
Logic Inputs to GND ................................ – 0.3V to 7.5V
V
OUT A
, V
OUT B
…V
OUT D
,
REF to GND ................................ –0.3V to (V
CC
+ 0.3V)
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
LTC1664C ............................................... 0°C to 70°C
LTC1664I ............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
GN PACKAGE
16-LEAD PLASTIC SSOP
N PACKAGE
16-LEAD PDIP
T
JMAX
= 125°C,
θ
JA
= 150°C/W (GN)
T
JMAX
= 125°C,
θ
JA
= 100°C/W (N)
orDer inFormation
LEAD FREE FINISH
LTC1664CGN#PBF
LTC1664CN#PBF
LTC1664IGN#PBF
LTC1664IN#PBF
LEAD BASED FINISH
LTC1664CGN
LTC1664CN
LTC1664IGN
LTC1664IN
TAPE AND REEL
LTC1664CGN#TRPBF
LTC1664CN#TRPBF
LTC1664IGN#TRPBF
LTC1664IN#TRPBF
TAPE AND REEL
LTC1664CGN#TR
LTC1664CN#TR
LTC1664IGN#TR
LTC1664IN#TR
PART MARKING
1664
LTC1664CN
1664I
LTC1664IN
PART MARKING
1664
LTC1664CN
1664I
LTC1664IN
PACKAGE DESCRIPTION
16-Lead Plastic SSOP
16-Lead PDIP
16-Lead Plastic SSOP
16-Lead PDIP
PACKAGE DESCRIPTION
16-Lead Plastic SSOP
16-Lead PDIP
16-Lead Plastic SSOP
16-Lead PDIP
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
1664fa
2
LTC1664
electrical characteristics
SYMBOL
Accuracy
Resolution
Monotonicity
DNL
INL
V
OS
FSE
PSR
Differential Nonlinearity
Integral Nonlinearity
Offset Error
V
OS
Temperature Coefficient
Full-Scale Error
Full-Scale Error Temperature Coefficient
Power Supply Rejection
Input Voltage Range
Resistance
Capacitance
I
REF
Power Supply
V
CC
I
CC
Positive Supply Voltage
Supply Current
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
Sleep Mode (Note 3)
V
OUT
= 0V, V
CC
= 5.5V, V
REF
= 5.1V,
Code = 1023 (Note 9)
V
OUT
= V
CC
= 5.5V, V
REF
= 5.1V,
Code = 0 (Note 9)
Rising (Notes 4, 5)
Falling (Notes 4, 5)
Rising 0.1V
FS
to 0.9V
FS
±0.5LSB (Notes 4, 5)
Falling 0.9V
FS
to 0.1V
FS
± 0.5LSB (Notes 4, 5)
l
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. V
CC
= 2.7V to 5.5V, V
REF
≤ V
CC
, V
OUT
unloaded, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
10
10
±0.2
±0.6
±10
±15
±3
±30
0.18
l
TYP
MAX
UNITS
Bits
Bits
(Notes 2, 4)
(Notes 2, 4)
(Notes 2, 4)
(Note 7)
V
CC
= 5V, V
REF
= 4.096V (Note 4)
V
REF
= 2.5V
l
l
l
l
l
l
l
±0.75
±2.5
±30
±15
LSB
LSB
mV
µV/°C
LSB
µV/°C
LSB/V
Reference Input
0
70
130
12
Sleep Mode
l
V
CC
V
kΩ
pF
Not in Sleep Mode
l
Reference Current
0.001
2.7
236
186
1
10
10
30
27
1
5.5
380
290
3
100
120
µA
V
µA
µA
µA
mA
mA
DC Performance
Short-Circuit Current Low
Short-Circuit Current High
AC Performance
Voltage Output Slew Rate
Voltage Output Settling Time
Capacitive Load Driving
Digital I/O
V
IH
V
IL
V
OH
V
OL
I
LK
C
IN
Digital Input High Voltage
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input Leakage
Digital Input Capacitance
V
CC
= 2.7V to 5.5V
V
CC
= 2.7V to 3.6V
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 5.5V
I
OUT
= –1mA, D
OUT
Only
I
OUT
= 1mA, D
OUT
Only
V
IN
= GND to V
CC
l
l
l
l
l
l
l
l
l
0.60
0.25
6
19
1000
2.4
2.0
0.8
0.6
V
CC
– 1
0.4
0.05
2
±10
V/µs
V/µs
µs
µs
pF
V
V
V
V
V
V
µA
pF
1664fa
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LTC1664
timing characteristics
SYMBOL
V
CC
= 4.5V to 5.5V
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
V
CC
= 2.7V to 5.5V
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
D
IN
Valid to SCK Setup
D
IN
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
D
OUT
Propagation Delay
SCK Low to
CS/LD
Low
CLR Pulse Width
CS/LD
High to SCK Positive Edge
SCK Frequency
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
C
LOAD
= 15pF (Note 6)
(Note 6)
(Note 6)
(Note 6)
(Notes 6 and 8)
l
l
l
l
l
l
l
l
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. (Figure 1)
PARAMETER
D
IN
Valid to SCK Setup
D
IN
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
D
OUT
Propagation Delay
SCK Low to
CS/LD
Low
CLR Pulse Width
CS/LD
High to SCK Positive Edge
SCK Frequency
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
C
LOAD
= 15pF (Note 6)
(Note 6)
(Note 6)
(Note 6)
(Notes 6 and 8)
CONDITIONS
l
l
l
l
l
l
l
l
l
l
l
l
MIN
40
0
30
30
80
30
80
5
20
100
30
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
80
ns
ns
ns
ns
16.7
60
0
50
50
100
50
100
5
30
120
30
10
150
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
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:
Nonlinearity and monotonicity are defined and tested at
V
CC
= 5V, V
REF
= 4.096V, from code 20 to code 1023. See the Rail-to-Rail
Output Considerations section.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Load is 10kΩ in parallel with 100pF
.
Note 5:
V
CC
= V
REF
= 5V.
Note 6:
Guaranteed by design and not subject to test.
Note 7:
Measured at code 20.
Note 8:
If a continuous clock is used,
CS/LD
timing (t
7
and t
9
) will limit
the maximum clock frequency to 5MHz at 4.5V to 5.5V (3.85MHz at 2.7V
to 5.5V).
Note 9:
Any output shorted.
1664fa
4
LTC1664
typical perFormance characteristics
Integral Nonlinearity (INL)
2.5
2.0
1.5
1.0
0.5
LSB
0
– 0.5
–1.0
–1.5
– 2.0
– 2.5
0
256
512
CODE
768
1023
1664 G01
Differential Nonlinearity (DNL)
1.0
V
CC
= 5V
0.8 V
REF
= 4.096V
0.6
SUPPLY CURENT (µA)
0.4
0.2
LSB
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
256
512
CODE
768
1023
1664 G02
Supply Current vs Temperature
300
280
260
240
220
200
180
160
–55 –35 –15
V
REF
= V
CC
CODE = 1023
V
CC
= 5.5V
V
CC
= 4.5V
V
CC
= 3.6V
V
CC
= 2.7V
V
CC
= 5V
V
REF
= 4.096V
5 25 45 65
TEMPERATURE (°C)
85 105 125
1664 G03
Load Regulation vs Output Current
2.0
1.5
1.0
∆V
OUT
(LSB)
∆V
OUT
(LSB)
0.5
0
–0.5
–1.0
–1.5
–2.0
–2
SOURCE
–1
0
I
OUT
(mA)
SINK
1
2
1664 G04
Load Regulation vs Output Current
2.0
1.5
1.0
V
OUT
(V)
0.5
0
–0.5
–1.0
–1.5
–2.0
–500
SOURCE
0
I
OUT
(µA)
SINK
500
1664 G05
Large-Signal Step Response
5
4
3
2
1
0
V
CC
= V
REF
= 5V
10% TO
90% STEP
V
CC
= V
REF
= 5V
CODE = 512
V
CC
= V
REF
= 3V
CODE = 512
0
20
40
60
TIME (µs)
80
100
1664 G06
Mid-Scale Output Voltage
vs Load Current
3.0
2.9
2.8
2.7
V
OUT
(V)
2.6
2.5
2.4
2.3
2.2
2.1
2.0
–30
–20
SOURCE
–10
SINK
20
30
1664 G07
Mid-Scale Output Voltage
vs Load Current
2.0
1.9
1.8
V
REF
= V
CC
CODE = 512
V
CC
= 3.6V
V
CC
= 3V
SUPPLY CURRENT (mA)
1.2
1.0
0.8
0.6
0.4
0.2
SOURCE
–8
SINK
8
12 15
1664 G08
Supply Current vs Logic Input
Voltage
ALL DIGITAL INPUTS
SHORTED TOGETHER
V
REF
= V
CC
CODE = 512
V
CC
= 5.5V
V
CC
= 5V
V
OUT
(V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–15 –12
V
CC
= 4.5V
V
CC
= 2.7V
0
10
I
OUT
(mA)
–4
0
4
I
OUT
(mA)
0
0
1
2
3
4
LOGIC INPUT VOLTAGE (V)
5
1664 G09
1664fa
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