LTC1664
Micropower Quad
10-Bit DAC
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Tiny: 4 DACs in the Board Space of an SO-8
Micropower: 59
µ
A 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)
The LTC
®
1664 integrates four accurate, serially addres-
sable 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
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Mobile Communications
Remote Industrial Devices
Automatic Calibration for Manufacturing
Portable Battery-Powered Instruments
Trim/Adjust Applications
BLOCK DIAGRA
GND
1
10-BIT
DAC A
16 V
CC
10-BIT
DAC D
5
V
OUT D
1.0
0.8
0.6
V
CC
= 5V
V
REF
= 4.096V
V
OUT A
2
V
OUT B
3
10-BIT
DAC B
10-BIT
DAC C
4
V
OUT C
LSB
0.4
0.2
0
–0.2
CONTROL
LOGIC
REF
CS/LD
SCK
6
7
8
ADDRESS
DECODER
11
10
9
CLR
D
OUT
D
IN
1664 BD
–0.4
–0.6
–0.8
SHIFT REGISTER
–1.0
0
256
512
CODE
768
1023
1664 G08
U
Differential Nonlinearity (DNL)
W
U
1
LTC1664
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 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
ORDER PART
NUMBER
LTC1664CGN
LTC1664CN
LTC1664IGN
LTC1664IN
GN PACKAGE
16-LEAD PLASTIC SSOP
N PACKAGE
16-LEAD PDIP
GN PART MARKING
1664
1664I
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
Input Voltage Range
Resistance
Capacitance
I
REF
V
CC
I
CC
Reference Current
Positive Supply Voltage
Supply Current
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
Sleep Mode (Note 3)
Sleep Mode
q
q
PARAMETER
CONDITONS
MIN
10
10
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
q
q
q
q
q
q
q
±0.2
±0.6
±10
±15
±3
±30
0.18
±0.75
±2.5
±30
±15
µV/°C
LSB
µV/°C
LSB/V
V
CC
V
kΩ
pF
1
5.5
µA
V
µA
µA
µA
Reference Input
q
0
70
130
12
0.001
2.7
236
186
1
Not in Sleep Mode
q
Power Supply
q
q
q
q
380
290
3
2
U
LSB
LSB
mV
W
U
U
W W
W
LTC1664
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
q
q
q
q
q
q
q
CONDITIONS
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)
q
q
MIN
10
10
TYP
30
27
0.60
0.25
6
19
1000
MAX
100
120
UNITS
mA
mA
V/µs
V/µs
µs
µs
pF
V
V
DC Performance
2.4
2.0
0.8
0.6
V
CC
– 1
0.4
0.05
2
±10
V
V
V
V
µA
pF
TI I G CHARACTERISTICS
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
V
CC
= 2.7V to 5.5V
t
1
t
2
t
3
t
4
D
IN
Valid to SCK Setup
D
IN
Valid to SCK Hold
SCK High Time
SCK Low Time
V
CC
= 4.5V to 5.5V
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1)
CONDITIONS
q
q
UW
MIN
40
0
30
30
80
30
80
5
20
100
30
TYP
15
–11
5
7
30
4
26
26
0
37
0
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
(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)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
q
q
q
q
q
q
q
q
q
q
80
ns
ns
ns
ns
16.7
60
0
50
50
20
–14
8
12
MHz
ns
ns
ns
ns
q
q
q
q
3
LTC1664
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
5
t
6
t
7
t
8
t
9
t
10
t
11
PARAMETER
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
CONDITIONS
(Note 6)
(Note 6)
(Note 6)
C
LOAD
= 15pF (Note 6)
(Note 6)
(Note 6)
(Note 6)
(Notes 6 and 8)
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 and tested at V
CC
= 5V,
V
REF
= 4.096V, from code 20 to code 1023. See Rail-to-Rail output
considerations.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Load is 10kΩ in parallel with 100pF.
TYPICAL PERFOR A CE CHARACTERISTICS
Integral Nonlinearity (INL)
2.5
2.0
1.5
1.0
0.5
LSB
V
CC
= 5V
V
REF
= 4.096V
SUPPLY CURENT (µA)
0
– 0.5
–1.0
–1.5
– 2.0
– 2.5
0
256
512
CODE
768
1023
1664 G07
LSB
4
U W
UW
MIN
100
50
100
5
30
120
30
TYP
30
5
27
47
0
41
0
MAX
UNITS
ns
ns
ns
150
ns
ns
ns
ns
10
MHz
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.
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
256
512
CODE
768
1023
1664 G08
Supply Current vs Temperature
300
V
REF
= V
CC
CODE = 1023
V
CC
= 5V
V
REF
= 4.096V
280
260
240
220
200
180
V
CC
= 5.5V
V
CC
= 4.5V
V
CC
= 3.6V
V
CC
= 2.7V
160
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
1664 G11
LTC1664
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation vs Output Current
2
1.5
1
∆V
OUT
(LSB)
∆V
OUT
(LSB)
V
CC
= V
REF
= 5V
CODE = 512
0
–0.5
–1
–1.5
–2
–2
SOURCE
–1
0
I
OUT
(mA)
SINK
1
2
1664 G09
0
–0.5
–1
–1.5
–2
–500
SOURCE
0
I
OUT
(µA)
SINK
V
OUT
(V)
0.5
Midscale Output Voltage
vs Load Current
3
2.9
2.8
2.7
V
OUT
(V)
V
REF
= V
CC
CODE = 512
V
CC
= 5.5V
V
OUT
(V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
V
CC
= 3.6V
V
CC
= 3V
SUPPLY CURRENT (mA)
2.6
2.5
2.4
2.3
2.2
2.1
2
–30
–20
SOURCE
–10
SINK
20
30
1664 G01
V
CC
= 5V
V
CC
= 4.5V
0
10
I
OUT
(mA)
Minimum V
OUT
vs
Load Current (Output Sinking)
1400
1200
1000
800
25°C
600
–55°C
400
200
0
0
2
V
CC
= 5V
CODE = 0
1400
125°C
1200
1000
V
CC
– V
OUT
(mV)
V
OUT
(mV)
U W
|
|
Load Regulation vs Output Current
2
1.5
1
0.5
3
Large-Signal Step Response
5
V
CC
= V
REF
= 5V
10% TO
90% STEP
V
CC
= V
REF
= 3V
CODE = 512
4
2
1
0
500
1664 G10
0
20
40
60
TIME (µs)
80
100
1664 G05
Midscale Output Voltage
vs Load Current
2
1.9
1.8
V
REF
= V
CC
CODE = 512
1.2
1.0
0.8
0.6
0.4
0.2
SOURCE
–8
SINK
8
12 15
1664 G02
Supply Current vs Logic Input
Voltage
ALL DIGITAL INPUTS
SHORTED TOGETHER
V
CC
= 2.7V
1
–15 –12
–4
0
4
I
OUT
(mA)
0
0
1
2
3
4
LOGIC INPUT VOLTAGE (V)
5
1664 G12
Minimum Supply Headroom vs
Load Current (Output Sourcing)
V
REF
= 4.096V
∆V
OUT
< 1LSB
CODE = 1023
125°C
25°C
–55°C
400
200
0
800
600
4
6
I
OUT
(mA) (Sinking)
8
10
1664 G04
0
2
|
I
OUT
|
(mA) (Sourcing)
4
6
8
10
1664 G03
5
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