FEATURES
■Tiny: 8 DACs in the Board Space of an SO-8
■Micropower: 56 A per DAC Plus
1 A 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-VCC Output
■Reference Input Impedance is Constant— Eliminates External Buffer
LTC1665/LTC1660
Micropower Octal
8-Bit and 10-Bit DACs
DESCRIPTIOU
The 8-bit LTC®1665 and 10-bit LTC1660 integrate eight accurate, serially addressable digital-to-analog converters (DACs) in tiny 16-pin narrow SSOP packages. Each buffered DAC draws just 56 A 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 1 A.
Linear Technology’s proprietary, inherently monotonic voltage interpolation architecture provides excellent linearity while allowing for an exceptionally small external form factor.
APPLICATIOUS
■Mobile Communications
■Remote Industrial Devices
■Automatic Calibration for Manufacturing
■Portable Battery-Powered Instruments
■Trim/Adjust Applications
BLOCK DIAGRAW
GND |
1 |
VOUT A |
2 |
VOUT B |
3 |
VOUT C |
4 |
VOUT D |
5 |
REF |
6 |
CS/LD |
7 |
SCK |
8 |
DAC A |
DAC H |
DAC B |
DAC G |
DAC C |
DAC F |
DAC D |
DAC E |
CONTROL |
ADDRESS |
LOGIC |
DECODER |
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SHIFT REGISTER |
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.
LTC1665 Differential Nonlinearity (DNL)
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0.5 |
VCC = 5V |
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0.4 |
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16 |
VCC |
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VREF = 4.096V |
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0.3 |
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0.2 |
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15 |
VOUT H |
LSB |
0.1 |
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0 |
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–0.1 |
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–0.2 |
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14 |
VOUT G |
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–0.3 |
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–0.4 |
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–0.5 |
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0 |
64 |
128 |
192 |
255 |
13 |
VOUT F |
CODE |
1665/60 G09 |
LTC1660 Differential Nonlinearity (DNL)
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1 |
VCC = 5V |
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0.8 |
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12 |
VOUT E |
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VREF = 4.096V |
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0.6 |
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11 |
CLR |
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0.4 |
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0.2 |
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LSB |
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0 |
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10 |
DOUT |
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–0.2 |
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–0.4 |
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9 |
DIN |
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–0.6 |
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–0.8 |
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1665/60 BD |
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–1 |
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0 |
256 |
512 |
768 |
1023 |
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CODE |
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1665/60 G13 |
1
LTC1665/LTC1660
ABSOLUTE WAXIWUW RATIUGS
(Note 1)
VCC to GND .............................................. |
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– 0.2V to 7.5V |
Logic Inputs to GND ................................ |
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– 0.2V to 7.5V |
VOUT A, VOUT B…VOUT H, |
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REF to GND ................................. |
– 0.2V to (VCC + 0.2V) |
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Maximum Junction Temperature ......................... |
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125°C |
Operating Temperature Range |
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0 ° C to 70°C |
LTC1665C/LTC1660C ............................ |
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LTC1665I/LTC1660I .......................... |
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– 40 ° C to 85°C |
Storage Temperature Range ................ |
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– 65 ° C to 150°C |
Lead Temperature (Soldering, 10 sec) |
................ 300°C |
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PACKAGE/ORDER IUFORWATIOU
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ORDER PART |
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TOP VIEW |
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NUMBER |
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GND |
1 |
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16 |
VCC |
LTC1665CGN |
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VOUT A |
2 |
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15 |
VOUT H |
LTC1665CN |
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VOUT G |
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VOUT B |
3 |
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14 |
LTC1665IGN |
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VOUT C |
4 |
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VOUT F |
LTC1665IN |
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VOUT D |
5 |
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12 |
VOUT E |
LTC1660CGN |
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6 |
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REF |
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CLR |
LTC1660CN |
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CS/LD |
7 |
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10 |
DOUT |
LTC1660IGN |
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SCK |
8 |
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DIN |
LTC1660IN |
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GN PACKAGE |
N PACKAGE |
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GN PART MARKING |
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16-LEAD PLASTIC SSOP 16-LEAD PDIP |
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TJMAX = 125°C, θJA = 150°C/W (GN) |
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1665 |
1660 |
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TJMAX = 125°C, θJA = 100°C/W (N) |
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1665I |
1660I |
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Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VREF ≤ VCC, VOUT unloaded, unless otherwise noted.
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LTC1665 |
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LTC1660 |
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SYMBOL |
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
UNITS |
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Accuracy |
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Resolution |
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8 |
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10 |
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Bits |
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Monotonicity |
VREF ≤ VCC – 0.1V (Note 2) |
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8 |
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10 |
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Bits |
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DNL |
Differential Nonlinearity |
VREF ≤ VCC – 0.1V (Note 2) |
● |
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±0.1 |
±0.5 |
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±0.2 |
±0.75 |
LSB |
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INL |
Integral Nonlinearity |
VREF ≤ VCC – 0.1V (Note 2) |
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±0.2 |
±1.0 |
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±0.6 |
±2.5 |
LSB |
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VOS |
Offset Error |
(Note 7) |
● |
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±10 |
±30 |
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±10 |
±30 |
mV |
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VOS Temperature Coefficient |
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±15 |
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±15 |
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µV/°C |
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FSE |
Full-Scale Error |
VCC = 5V, VREF = 4.096V |
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±1 |
±4 |
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±3 |
±15 |
LSB |
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Full-Scale Error Temperature Coefficient |
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±30 |
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±30 |
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µV/°C |
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PSR |
Power Supply Rejection |
VREF = 2.5V |
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0.045 |
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0.18 |
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LSB/V |
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The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VREF ≤ VCC, VOUT unloaded, unless otherwise noted.
SYMBOL |
PARAMETER |
CONDITONS |
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MIN |
TYP |
MAX |
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UNITS |
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Reference |
Input |
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Input Voltage Range |
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● |
0 |
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VCC |
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V |
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Resistance |
Not in Sleep Mode |
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35 |
65 |
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kΩ |
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Capacitance |
(Note 6) |
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15 |
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pF |
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IREF |
Reference Current |
Sleep Mode |
● |
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0.001 |
1 |
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µA |
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Power Supply |
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VCC |
Positive Supply Voltage |
For Specified Performance |
● |
2.7 |
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5.5 |
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V |
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ICC |
Supply Current |
VCC = 5V (Note 3) |
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450 |
730 |
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µA |
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VCC = 3V (Note 3) |
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340 |
550 |
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µA |
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Sleep Mode (Note 3) |
● |
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1 |
3 |
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µA |
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2
LTC1665/LTC1660
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VREF ≤ VCC, VOUT unloaded, unless otherwise noted.
SYMBOL |
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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DC Performance |
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Short-Circuit Current Low |
VOUT = 0V, VCC = 5.5V, VREF = 5.1V, Code = Full Scale |
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10 |
30 |
100 |
mA |
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Short-Circuit Current High |
VOUT = VCC = 5.5V, VREF = 5.1V, Code = 0 |
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10 |
27 |
120 |
mA |
AC Performance |
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Voltage Output Slew Rate |
Rising (Notes 4, 5) |
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0.60 |
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V/ s |
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Falling (Notes 4, 5) |
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0.25 |
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V/ s |
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Voltage Output Settling Time |
To ±0.5LSB (Notes 4, 5) |
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30 |
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s |
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Capacitive Load Driving |
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1000 |
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pF |
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Digital I/O |
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VIH |
Digital Input High Voltage |
VCC = 2.7V to 5.5V |
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2.4 |
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V |
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VCC = 2.7V to 3.6V |
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2.0 |
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V |
VIL |
Digital Input Low Voltage |
VCC = 4.5V to 5.5V |
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0.8 |
V |
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VCC = 2.7V to 5.5V |
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0.6 |
V |
VOH |
Digital Output High Voltage |
IOUT = – 1mA, DOUT Only |
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VCC – 1 |
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V |
VOL |
Digital Output Low Voltage |
IOUT = 1mA, DOUT Only |
● |
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0.4 |
V |
ILK |
Digital Input Leakage |
VIN = GND to VCC |
● |
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±10 |
A |
CIN |
Digital Input Capacitance |
(Note 6) |
● |
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10 |
pF |
TIWIUG CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (See Figure 1)
SYMBOL |
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PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
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UNITS |
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VCC = 4.5V |
to 5.5V |
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t1 |
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DIN Valid to SCK Setup |
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40 |
15 |
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ns |
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t2 |
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DIN Valid to SCK Hold |
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0 |
–11 |
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ns |
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t3 |
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SCK High Time |
(Note 6) |
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30 |
5 |
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t4 |
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SCK Low Time |
(Note 6) |
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30 |
7 |
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t5 |
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(Note 6) |
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80 |
30 |
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ns |
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CS/LD Pulse Width |
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t6 |
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LSB SCK High to |
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(Note 6) |
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30 |
4 |
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ns |
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CS/LD High |
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t7 |
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(Note 6) |
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80 |
26 |
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ns |
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CS/LD Low to SCK High |
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t8 |
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DOUT Propagation Delay |
CLOAD = 15pF (Note 6) |
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5 |
26 |
80 |
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t9 |
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SCK Low to |
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(Note 6) |
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20 |
0 |
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ns |
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CS/LD Low |
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t10 |
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Pulse Width |
(Note 6) |
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100 |
37 |
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ns |
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CLR |
● |
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t11 |
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(Note 6) |
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30 |
0 |
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ns |
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CS/LD High to SCK Positive Edge |
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SCK Frequency |
Continuous Square Wave (Note 6) |
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5.00 |
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Continuous 23% Duty Cycle Pulse (Note 6) |
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7.69 |
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Gated Square Wave (Note 6) |
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16.7 |
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MHz |
VCC = 2.7V to 5.5V |
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t1 |
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DIN Valid to SCK Setup |
(Note 6) |
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60 |
20 |
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t2 |
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DIN Valid to SCK Hold |
(Note 6) |
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0 |
–14 |
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t3 |
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SCK High Time |
(Note 6) |
● |
50 |
8 |
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t4 |
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SCK Low Time |
(Note 6) |
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50 |
12 |
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t5 |
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(Note 6) |
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100 |
30 |
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CS/LD Pulse Width |
● |
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3
LTC1665/LTC1660
TIWIUG CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (See Figure 1)
SYMBOL |
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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t6 |
LSB SCK High to |
CS/LD High |
(Note 6) |
● |
50 |
5 |
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ns |
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t7 |
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(Note 6) |
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100 |
27 |
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ns |
CS/LD Low to SCK High |
● |
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t8 |
DOUT Propagation Delay |
CLOAD = 15pF (Note 6) |
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5 |
47 |
150 |
ns |
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t9 |
SCK Low to |
CS/LD Low |
(Note 6) |
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30 |
0 |
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ns |
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t10 |
CLR Pulse Width |
(Note 6) |
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120 |
41 |
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ns |
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t11 |
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(Note 6) |
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30 |
0 |
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ns |
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CS/LD High to SCK Positive Edge |
● |
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SCK Frequency |
Continuous Square Wave (Note 6) |
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3.85 |
MHz |
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Continuous 28% Duty Cycle Pulse |
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5.55 |
MHz |
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Gated Square Wave |
● |
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10 |
MHz |
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 VCC.
Note 4: Load is 10kΩ in parallel with 100pF.
Note 5: VCC = VREF = 5V. DAC switched between 0.1VFS and 0.9VFS, 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.
TYPICAL PERFOR A CE CHARACTERISTICS |
(LTC1665/LTC1660) |
UW |
VOUT (V)
Midscale Output Voltage vs Load Current
3 VREF = VCC
2.9CODE = 128 (LTC1665) CODE = 512 (LTC1660)
2.8
2.7VCC = 5.5V
2.6 |
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VCC = 5V |
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2.5 |
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2.4 |
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2.3 |
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VCC = 4.5V |
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2.2 |
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2.1 |
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2 |
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SOURCE |
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–30 |
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IOUT (mA) |
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VOUT (V)
Midscale Output Voltage vs Load Current
2 VREF = VCC
1.9CODE = 128 (LTC1665)
CODE = 512 (LTC1660)
1.8
1.7VCC = 3.6V
1.6 |
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1.5 |
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1.4 |
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1.3 |
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VCC = 2.7V |
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1.2 |
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1.1 |
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1 |
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SOURCE |
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–15 –12 – 8 |
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– 4 |
0 |
4 |
8 |
12 15 |
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IOUT (mA) |
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1665/60 G01 |
1665/60 G02 |
4
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LTC1665/LTC1660 |
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TYPICAL PERFOR A CE CHARACTERISTICS |
(LTC1665/LTC1660) |
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UW |
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Minimum Supply Headroom vs |
Minimum VOUT vs |
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Load Current (Output Sourcing) |
Load Current (Output Sinking) |
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1400 |
VREF = 4.096V |
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1200 |
VOUT < 1LSB |
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CODE = 255 (LTC1665) |
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1000 |
CODE = 1023 (LTC1660) |
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125°C |
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800 |
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OUT |
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25°C |
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– V |
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CC |
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–55°C |
V |
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400 |
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200 |
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0 |
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1400 |
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1200 |
CODE = 0 |
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1000 |
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25°C |
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OUT |
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600 |
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400 |
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200 |
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1665/60 G03 |
1665/60 G04 |
VOUT (V)
Large-Signal Step Response
5 |
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VCC = VREF = 5V |
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4 |
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10% TO |
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90% STEP |
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2 |
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0 |
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40 |
60 |
80 |
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TIME (µs) |
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SUPPLY CURRENT ( A)
Supply Current vs Temperature
500 |
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480 |
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460 |
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VCC = 5.5V |
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440 |
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VCC = 4.5V |
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420 |
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VCC = 3.6V |
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400 |
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380 |
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360 |
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VCC = 2.7V |
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340 |
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320 |
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300 –55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
Supply Current vs Logic Input Voltage
2 
ALL DIGITAL INPUTS
SHORTED TOGETHER
1.6
1.2
0.8
0.4
0
0 |
1 |
2 |
3 |
4 |
5 |
LOGIC INPUT VOLTAGE (V)
1665/60 G05 1665/60 G06 1665/60 G07
TYPICAL PERFOR A CE CHARACTERISTICS |
(LTC1665) |
UW |
LSB
Integral Nonlinearity (INL) |
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1 |
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VCC = 5V |
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0.8 |
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VREF = 4.096V |
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0.6 |
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0.4 |
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0.2 |
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–0.2 |
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–0.4 |
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–0.6 |
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–0.8 |
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–1 |
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0 |
64 |
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128 |
192 |
255 |
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CODE |
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1665/60 G08 |
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LSB
Differential Nonlinearity (DNL)
0.5 |
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VCC = 5V |
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0.4 |
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VREF = 4.096V |
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0.3 |
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0.2 |
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0.1 |
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–0.1 |
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–0.2 |
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–0.3 |
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–0.4 |
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–0.5 |
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0 |
64 |
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128 |
192 |
255 |
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CODE |
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1665/60 G09 |
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5
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