LTC1665/LTC1660
Micropower Octal
8-Bit and 10-Bit DACs
DESCRIPTIO
The 8-bit LTC
®
1665 and 10-bit LTC1660 integrate eight
accurate, serially addressable digital-to-analog convert-
ers (DACs) in tiny 16-pin narrow SSOP packages. Each
buffered DAC draws just 56µA total supply current, yet is
capable of supplying DC output currents in excess of
5mA and reliably driving capacitive loads 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 LTC1665 and LTC1660
ideal for battery-powered applications, while their ease of
use, high performance and wide supply range make them
excellent choices as general purpose converters.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
Tiny: 8 DACs in the Board Space of an SO-8
Micropower: 56
µ
A per DAC Plus
1µA Sleep Mode for Extended Battery Life
Pin Compatible 8-Bit LTC1665 and 10-Bit LTC1660
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 Constant—
Eliminates External Buffer
APPLICATIO S
s
s
s
s
s
Mobile Communications
Remote Industrial Devices
Automatic Calibration for Manufacturing
Portable Battery-Powered Instruments
Trim/Adjust Applications
BLOCK DIAGRA
GND
1
LTC1665 Differential Nonlinearity (DNL)
0.5
16 V
CC
0.4
0.3
0.2
V
CC
= 5V
V
REF
= 4.096V
V
OUT A
2
DAC A
DAC H
15 V
OUT H
LSB
0.1
0
–0.1
–0.2
V
OUT B
3
DAC B
DAC G
14 V
OUT G
–0.3
–0.4
–0.5
0
64
128
CODE
192
255
1665/60 G09
V
OUT C
4
DAC C
DAC F
13 V
OUT F
LTC1660 Differential Nonlinearity (DNL)
1
V
OUT D
5
DAC D
DAC E
12 V
OUT E
0.8
0.6
0.4
V
CC
= 5V
V
REF
= 4.096V
REF
6
CONTROL
LOGIC
ADDRESS
DECODER
11
CLR
0.2
LSB
0
–0.2
–0.4
CS/LD
7
10
D
OUT
SCK
8
SHIFT REGISTER
9
D
IN
–0.6
–0.8
–1
0
256
512
CODE
768
1023
1665/60 G13
1665/60 BD
U
W
U
1
LTC1665/LTC1660
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
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 V
OUT H
14 V
OUT G
13 V
OUT F
12 V
OUT E
11 CLR
10 D
OUT
9
D
IN
V
CC
to GND .............................................. – 0.2V to 7.5V
Logic Inputs to GND ................................ – 0.2V to 7.5V
V
OUT A
, V
OUT B
…V
OUT H
,
REF to GND ................................. – 0.2V to (V
CC
+ 0.2V)
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range
LTC1665C/LTC1660C ............................ 0°C to 70°C
LTC1665I/LTC1660I .......................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
ORDER PART
NUMBER
LTC1665CGN
LTC1665CN
LTC1665IGN
LTC1665IN
LTC1660CGN
LTC1660CN
LTC1660IGN
LTC1660IN
GN PART MARKING
1665
1665I
1660
1660I
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)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The
q
denotes 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.
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
V
REF
= 2.5V
V
CC
= 5V, V
REF
= 4.096V
V
REF
≤
V
CC
– 0.1V (Note 2)
V
REF
≤
V
CC
– 0.1V (Note 2)
V
REF
≤
V
CC
– 0.1V (Note 2)
(Note 7)
q
q
q
q
q
q
q
q
PARAMETER
CONDITIONS
LTC1665
MIN
TYP
MAX
8
8
±0.1
±0.2
±10
±15
±1
±30
0.045
±4
±0.5
±1.0
±30
LTC1660
MIN
TYP
MAX
10
10
±0.2
±0.6
±10
±15
±3
±30
0.18
±15
±0.75
±2.5
±30
UNITS
Bits
Bits
LSB
LSB
mV
µV/°C
LSB
µV/°C
LSB/V
The
q
denotes 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.
SYMBOL
PARAMETER
Input Voltage Range
Resistance
Capacitance
I
REF
V
CC
I
CC
Reference Current
Positive Supply Voltage
Supply Current
Power Supply
For Specified Performance
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
Sleep Mode (Note 3)
q
q
q
q
CONDITONS
q
MIN
0
35
TYP
MAX
V
CC
UNITS
V
kΩ
pF
Reference Input
Not in Sleep Mode
(Note 6)
Sleep Mode
q
q
65
15
0.001
1
5.5
450
340
1
730
550
3
2.7
2
U
µA
V
µA
µA
µA
W
U
U
W W
W
LTC1665/LTC1660
ELECTRICAL CHARACTERISTICS
The
q
denotes 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.
SYMBOL
PARAMETER
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
(Note 6)
q
q
q
q
q
q
q
q
CONDITIONS
V
OUT
= 0V, V
CC
= 5.5V, V
REF
= 5.1V, Code = Full Scale
V
OUT
= V
CC
= 5.5V, V
REF
= 5.1V, Code = 0
Rising (Notes 4, 5)
Falling (Notes 4, 5)
To
±0.5LSB
(Notes 4, 5)
q
q
MIN
10
10
TYP
30
27
0.60
0.25
30
1000
MAX
100
120
UNITS
mA
mA
V/µs
V/µs
µs
pF
V
V
DC Performance
2.4
2.0
0.8
0.6
V
CC
– 1
0.4
±10
10
V
V
V
V
µA
pF
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1)
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
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)
Continuous Square Wave (Note 6)
Continuous 23% Duty Cycle Pulse (Note 6)
Gated Square Wave (Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
CONDITIONS
q
q
q
q
q
q
q
q
q
q
q
q
q
q
TI I G CHARACTERISTICS
V
CC
= 4.5V to 5.5V
40
0
30
30
80
30
80
5
20
100
30
15
–11
5
7
30
4
26
26
0
37
0
5.00
7.69
16.7
60
0
50
50
100
20
–14
8
12
30
80
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
MHz
MHz
ns
ns
ns
ns
ns
V
CC
= 2.7V to 5.5V
t
1
t
2
t
3
t
4
t
5
D
IN
Valid to SCK Setup
D
IN
Valid to SCK Hold
SCK High Time
SCK Low Time
CS/LD Pulse Width
q
q
q
q
q
UW
MIN
TYP
MAX
UNITS
3
LTC1665/LTC1660
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1)
SYMBOL
t
6
t
7
t
8
t
9
t
10
t
11
PARAMETER
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
CONDITIONS
(Note 6)
(Note 6)
C
LOAD
= 15pF (Note 6)
(Note 6)
(Note 6)
(Note 6)
Continuous Square Wave (Note 6)
Continuous 28% Duty Cycle Pulse
Gated Square Wave
q
q
q
q
q
q
q
q
q
TI I G CHARACTERISTICS
Note 1:
Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Nonlinearity and monotonicity are defined from code 4 to code
255 for the LTC1665 and from code 20 to code 1023 for the LTC1660.
See Applications Information.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Load is 10kΩ in parallel with 100pF.
TYPICAL PERFOR A CE CHARACTERISTICS
Midscale Output Voltage
vs Load Current
3
2.9
2.8
2.7
V
CC
= 5.5V
2.6
2.5
2.4
2.3
2.2
2.1
2
–30
–20
SOURCE
–10
SINK
20
30
V
CC
= 4.5V
V
CC
= 5V
V
REF
= V
CC
CODE = 128 (LTC1665)
CODE = 512 (LTC1660)
2
1.9
1.8
1.7
V
OUT
(V)
V
OUT
(V)
4
U W
UW
MIN
50
100
5
30
120
30
TYP
5
27
47
0
41
0
MAX
UNITS
ns
ns
150
ns
ns
ns
ns
3.85
5.55
10
MHz
MHz
MHz
Note 5:
V
CC
= V
REF
= 5V. DAC switched between 0.1V
FS
and 0.9V
FS
,
i.e., codes 26 and 230 for the LTC1665 or codes 102 and 922 for the
LTC1660.
Note 6:
Guaranteed by design and not production tested.
Note 7:
Measured at code 4 for the LTC1665 and code 20 for the
LTC1660.
(LTC1665/LTC1660)
Midscale Output Voltage
vs Load Current
V
REF
= V
CC
CODE = 128 (LTC1665)
CODE = 512 (LTC1660)
V
CC
= 3.6V
V
CC
= 3V
1.6
1.5
1.4
1.3
1.2
1.1
1
–15 –12
–8
SOURCE
SINK
8
12 15
1665/60 G02
V
CC
= 2.7V
0
10
I
OUT
(mA)
–4
0
4
I
OUT
(mA)
1665/60 G01
LTC1665/LTC1660
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC1665/LTC1660)
Minimum Supply Headroom vs
Load Current (Output Sourcing)
1400
1200
1000
V
REF
= 4.096V
∆V
OUT
< 1LSB
CODE = 255 (LTC1665)
CODE = 1023 (LTC1660)
125°C
1400
1200
1000
V
CC
– V
OUT
(mV)
800
600
V
OUT
(mV)
400
200
0
0
2
|
4
6
I
OUT
(mA) (Sourcing)
Large-Signal Step Response
5
V
CC
= V
REF
= 5V
10% TO
90% STEP
SUPPLY CURRENT (µA)
4
440
420
400
380
360
340
320
V
CC
= 4.5V
V
CC
= 3.6V
V
OUT
(V)
3
SUPPLY CURRENT (mA)
2
1
0
0
20
40
60
TIME (µs)
80
100
1665/60 G05
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC1665)
Integral Nonlinearity (INL)
1
0.8
0.6
0.4
0.2
LSB
LSB
V
CC
= 5V
V
REF
= 4.096V
0
–0.2
–0.4
–0.6
–0.8
–1
0
64
128
CODE
192
255
1665/60 G08
U W
U W
|
Minimum V
OUT
vs
Load Current (Output Sinking)
V
CC
= 5V
CODE = 0
125°C
25°C
–55°C
800
25°C
600
–55°C
400
200
0
8
10
1665/60 G03
0
2
|
I
OUT
|
(mA) (Sinking)
4
6
8
10
1665/60 G04
Supply Current vs Temperature
500
480
460
V
CC
= 5.5V
1.6
2
Supply Current vs Logic Input Voltage
ALL DIGITAL INPUTS
SHORTED TOGETHER
1.2
0.8
V
CC
= 2.7V
0.4
300
–55 –35 –15
0
5 25 45 65 85 105 125
TEMPERATURE (°C)
1665/60 G06
0
1
2
3
4
LOGIC INPUT VOLTAGE (V)
5
1665/60 G07
Differential Nonlinearity (DNL)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
64
128
CODE
192
255
1665/60 G09
V
CC
= 5V
V
REF
= 4.096V
5
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