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DAC082S085
SNAS365G – MAY 2006 – REVISED JUNE 2016
DAC082S085 8-Bit Micro Power DUAL Digital-to-Analog Converter With Rail-to-Rail Output
1 Features
2 Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
1
Ensured Monotonicity
Low Power Operation
Rail-to-Rail Voltage Output
Power-On Reset to 0 V
Simultaneous Output Updating
Wide Power Supply Range: 2.7 V to 5.5 V
Industry's Smallest Package
Power-Down Modes
Key Specifications:
– Resolution: 8 Bits
– INL: ±0.5 LSB (Maximum)
– DNL: 0.18 / –0.13 LSB (Maximum)
– Settling Time: 4.5 µs (Maximum)
– Zero Code Error: 15 mV (Maximum)
– Full-Scale Error: –0.75% FS (Maximum)
– Supply Power:
– Normal: 0.6 mW (3 V) / 1.6 mW (5 V)
(Typical)
– Power Down: 0.3 µW (3 V) / 0.8 µW (5 V)
(Typical)
Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
3 Description
The DAC082S085 device is a full-featured, generalpurpose, DUAL, 8-bit, voltage-output, digital-to-analog
converter (DAC) that can operate from a single 2.7-V
to 5.5-V supply and consumes 0.6 mW at 3 V and 1.6
mW at 5 V. The DAC082S085 is packaged in 10-pin
SON and VSSOP packages. The 10-pin WSON
package makes the DAC082S085 the smallest DUAL
DAC in its class. The on-chip output amplifier allows
rail-to-rail output swing, and the three-wire serial
interface operates at clock rates up to 40 MHz over
the entire supply voltage range. Competitive devices
are limited to 25-MHz clock rates at supply voltages
in the 2.7 V to 3.6 V range. The serial interface is
compatible with standard SPI™, QSPI, MICROWIRE,
and DSP interfaces.
Device Information(1)
PART NUMBER
DAC082S085
PACKAGE
BODY SIZE (NOM)
VSSOP (10)
3.00 mm × 3.00 mm
WSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
DNL at VA = 3 V
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
DAC082S085
SNAS365G – MAY 2006 – REVISED JUNE 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Description (continued).........................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
5
7.1
7.2
7.3
7.4
7.5
7.6
7.7
5
5
5
6
6
8
9
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Timing Requirements ................................................
Typical Characteristics ..............................................
Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 14
8.3 Device Functional Modes........................................ 15
8.4 Programming........................................................... 16
9
Application and Implementation ........................ 18
9.1 Application Information............................................ 18
9.2 Typical Application ................................................. 18
10 Power Supply Recommendations ..................... 19
10.1 Using References as Power Supplies................... 19
11 Layout................................................................... 22
11.1 Layout Guidelines ................................................. 22
11.2 Layout Example .................................................... 22
12 Device and Documentation Support ................. 23
12.1
12.2
12.3
12.4
12.5
12.6
Device Support......................................................
Receiving Notification of Documentation Updates
Community Resource............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
23
24
24
24
24
24
13 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (March 2013) to Revision G
Page
•
Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
•
Changed Thermal Information table ...................................................................................................................................... 6
Changes from Revision E (March 2013) to Revision F
•
2
Page
Changed layout of National Data Sheet to TI format ........................................................................................................... 22
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5 Description (continued)
The reference for the DAC082S085 serves both channels and can vary in voltage between 1 V and VA, providing
the widest possible output dynamic range. The DAC082S085 has a 16-bit input shift register that controls the
outputs to be updated, the mode of operation, the power-down condition, and the binary input data. Both outputs
can be updated simultaneously or individually depending on the setting of the two mode of operation bits.
A power-on reset circuit ensures that the DAC output powers up to 0 V and remains there until there is a valid
write to the device. A power-down feature reduces power consumption to less than a microWatt with three
different termination options.
The low power consumption and small packages of the DAC082S085 make it an excellent choice for use in
battery-operated equipment.
The DAC082S085 is one of a family of pin-compatible DACs, including the 10-bit DAC102S085 and the 12-bit
DAC124S085. The DAC082S085 operates over the extended industrial temperature range of −40°C to 105°C.
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SNAS365G – MAY 2006 – REVISED JUNE 2016
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6 Pin Configuration and Functions
DSC Package
10-Pin WSON
Top View
DGS Package
10-Pin VSSOP
Top View
VA
1
10
SCLK
VA
1
10
SCLK
VOUTA
2
9
SYNC
VOUTA
2
9
SYNC
VOUTB
3
8
DIN
VOUTB
3
8
DIN
NC
4
7
VREFIN
NC
4
7
VREFIN
NC
5
6
GND
NC
5
6
GND
Exposed Thermal Pad
Not to scale
Not to scale
Pin Functions
PIN
NO.
NAME
TYPE
DESCRIPTION
1
VA
Supply
2
VOUTA
Analog Output
Power supply input. Must be decoupled to GND.
Channel A analog output voltage.
3
VOUTB
Analog Output
Channel B analog output voltage.
4
NC
—
Not connected
5
NC
—
Not connected
6
GND
Ground
7
VREFIN
Analog Input
Unbuffered reference voltage shared by all channels. Must be decoupled
to GND.
8
DIN
Digital Input
Serial data input. Data is clocked into the 16-bit shift register on the falling
edges of SCLK after the fall of SYNC.
Ground reference for all on-chip circuitry.
9
SYNC
Digital Input
Frame synchronization input for the data input. When this pin goes low, it
enables the input shift register and data is transferred on the falling edges
of SCLK. The DAC is updated on the 16th clock cycle unless SYNC is
brought high before the 16th clock, in which case the rising edge of
SYNC acts as an interrupt and the write sequence is ignored by the DAC.
10
SCLK
Digital Input
Serial clock input. Data is clocked into the input shift register on the falling
edges of this pin.
PAD
PAD
Ground
4
Exposed die attach pad can be connected to ground or left floating.
Soldering the pad to the PCB offers optimal thermal performance and
enhances package self-alignment during reflow.
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7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1) (2) (3)
MIN
Supply voltage, VA
Voltage on any input pin
–0.3
Input current at any pin (4)
Package input current (4)
Power consumption at TA = 25°C
See
(1)
(2)
(3)
(4)
(5)
UNIT
6.5
V
6.5
V
10
mA
20
mA
150
°C
150
°C
(5)
Junction temperature, TJ
Storage temperature, Tstg
MAX
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are measured with respect to GND = 0 V, unless otherwise specified.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
When the input voltage at any pin exceeds 5.5 V or is less than GND, the current at that pin must be limited to 10 mA. The 20-mA
maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 10
mA to two.
The absolute maximum junction temperature (TJmax) for this device is 150°C. The maximum allowable power dissipation is dictated by
TJmax, the junction-to-ambient thermal resistance (RθJA), and the ambient temperature (TA), and can be calculated using the formula
PDMAX = (TJmax − TA) / RθJA. The values for maximum power dissipation is reached only when the device is operated in a severe fault
condition (for example, when input or output pins are driven beyond the operating ratings, or the power supply polarity is reversed).
7.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
Machine model (MM)
(1) (2)
UNIT
±2500
V
±250
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
Human-body model is 100-pF capacitor discharged through a 1.5-kΩ resistor. Machine model is 220 pF discharged through 0 Ω.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
Operating temperature, TA
–40
105
°C
Supply voltage, VA
2.7
5.5
V
Reference voltage, VREFIN
1
VA
V
Digital input voltage (2)
0
5.5
V
Output load
0
SCLK frequency
(1)
(2)
1500
Up to 40
pF
MHz
All voltage are measured with respect to GND = 0 V, unless otherwise specified.
The inputs are protected as shown below. Input voltage magnitudes up to 5.5 V, regardless of VA, does not cause errors in the
conversation result. For example, if VA is 3 V, the digital input pins can be driven with a 5-V logic device.
I/O
TO INTERNAL
CIRCUITRY
GND
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7.4 Thermal Information
DAC082S085
THERMAL METRIC (1)
DGS (VSSOP)
DSC (WSON)
10 PINS
10 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
240
250
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
53.3
40.7
°C/W
RθJB
Junction-to-board thermal resistance
78.9
23.7
°C/W
ψJT
Junction-to-top characterization parameter
4.8
0.4
°C/W
ψJB
Junction-to-board characterization parameter
77.6
23.8
°C/W
RθJC(bottom)
Junction-to-case (bottom) thermal resistance
N/A
4.7
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Electrical Characteristics
The following specifications apply for VA = 2.7 V to 5.5 V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range
3 to 252. All limits are at TA = 25°C, unless otherwise specified. (1)
PARAMETER
TEST CONDITIONS
MIN
TYP (2)
MAX
UNIT
STATIC PERFORMANCE
INL
Resolution
TMIN ≤ TA ≤ TMAX
8
Monotonicity
TMIN ≤ TA ≤ TMAX
8
Integral non-linearity
DNL
Differential non-linearity
TA = 25°C
Zero code error
LSB
TMIN ≤ TA ≤ TMAX
±0.5
TA = 25°C
VA = 2.7 V to 5.5 V
0.04
Min
−0.02
−0.13
4
mV
15
−0.1
TA = 25°C
IOUT = 0
GE
Gain error
All ones Loaded to DAC register
ZCED
Zero code error drift
LSB
0.18
TMIN ≤ TA ≤ TMAX
Full-scale error
Gain error tempco
Max
TA = 25°C
IOUT = 0
FSE
TC GE
Bits
±0.14
TMIN ≤ TA ≤ TMAX
ZE
Bits
TMIN ≤ TA ≤ TMAX
−0.75
%FSR
−0.2
TA = 25°C
TMIN ≤ TA ≤ TMAX
%FSR
−1
−20
VA = 3 V
−0.7
VA = 5 V
–1
µV/°C
ppm/°C
OUTPUT CHARACTERISTICS
IOZ
Output voltage (3)
TMIN ≤ TA ≤ TMAX
High-impedance output
leakage current (3)
TMIN ≤ TA ≤ TMAX
0
VA = 3 V, IOUT = 200 µA
ZCO
Zero code output
Full-scale output
6
VA = 5 V, IOUT = 200 µA
7
IO
CL
(1)
(2)
(3)
6
µA
10
VA = 3 V, IOUT = 200 µA
2.984
VA = 3 V, IOUT = 1 mA
2.934
VA = 5 V, IOUT = 200 µA
4.989
VA = 5 V, IOUT = 1 mA
4.958
V
Output short-circuit current
(source)
–56
VA = 5 V, VOUT = 0 V, Input Code = FFh
–69
Output short-circuit current
(sink)
VA = 3 V, VOUT = 3 V, Input Code = 00h
52
VA = 5 V, VOUT = 5 V, Input Code = 00h
75
Continuous output current (3)
Available on each DAC output
Maximum load capacitance
±1
mV
VA = 3 V, VOUT = 0 V, Input Code = FFh
IOS
V
1.3
VA = 3 V, IOUT = 1 mA
VA = 5 V, IOUT = 1 mA
FSO
VREFIN
mA
mA
TMIN ≤ TA ≤ TMAX
11
RL = ∞
1500
RL = 2 kΩ
1500
mA
pF
To ensure accuracy, it is required that VA and VREFIN be well bypassed.
Typical figures are at TJ = 25°C, and represent most likely parametric norms. Test limits are specified to AOQL (Average Outgoing
Quality Level).
This parameter is specified by design or characterization and is not tested in production.
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Electrical Characteristics (continued)
The following specifications apply for VA = 2.7 V to 5.5 V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range
3 to 252. All limits are at TA = 25°C, unless otherwise specified.(1)
PARAMETER
ZOUT
TEST CONDITIONS
MIN
DC output impedance
TYP (2)
MAX
UNIT
Ω
7.5
REFERENCE INPUT CHARACTERISTICS
Input range minimum
VREFIN
Input range maximum
TA = 25°C
0.2
TMIN ≤ TA ≤ TMAX
1
V
TMIN ≤ TA ≤ TMAX
VA
Input impedance
60
kΩ
LOGIC INPUT CHARACTERISTICS
IIN
Input current (3)
TMIN ≤ TA ≤ TMAX
±1
TA = 25°C
VA = 3 V
VIL
TMIN ≤ TA ≤ TMAX
Input low voltage (3)
TMIN ≤ TA ≤ TMAX
Input high voltage (3)
Input capacitance (3)
0.8
TA = 25°C
1.4
2.1
V
TA = 25°C
VA = 5 V
CIN
V
1.5
TMIN ≤ TA ≤ TMAX
VA = 3 V
VIH
0.6
TA = 25°C
VA = 5 V
TMIN ≤ TA ≤ TMAX
µA
0.9
2.1
2.4
TMIN ≤ TA ≤ TMAX
3
pF
POWER REQUIREMENTS
VA
Supply voltage minimum
TMIN ≤ TA ≤ TMAX
Supply voltage maximum
TMIN ≤ TA ≤ TMAX
2.7
V
5.5
VA = 2.7 V to 3.6 V
fSCLK = 30 MHz
IN
Normal supply current
(output unloaded)
VA = 4.5 V to 5.5 V
fSCLK = 0
IPD
Power down supply current
(output unloaded, SYNC =
DIN = 0 V after PD mode
loaded)
VA = 4.5 V to 5.5 V
VA = 2.7 V to 3.6 V
fSCLK = 30 MHz
PN
VA = 4.5 V to 5.5 V
fSCLK = 0
PPD
Power down supply current
(output unloaded, SYNC =
DIN = 0 V after PD mode
loaded)
TA = 25°C
290
TA = 25°C
VA = 4.5 V to 5.5 V
0.1
µA
TMIN ≤ TA ≤ TMAX
TA = 25°C
1
0.15
µA
TMIN ≤ TA ≤ TMAX
TA = 25°C
1
0.6
TMIN ≤ TA ≤ TMAX
TA = 25°C
1
1.6
mW
TMIN ≤ TA ≤ TMAX
2.3
0.6
VA = 4.5 V to 5.5 V
All PD Modes (3)
µA
410
190
VA = 2.7 V to 3.6 V
VA = 2.7 V to 3.6 V
270
320
TMIN ≤ TA ≤ TMAX
VA = 4.5 V to 5.5 V
All PD Modes (3)
210
TMIN ≤ TA ≤ TMAX
VA = 2.7 V to 3.6 V
VA = 2.7 V to 3.6 V
Normal supply power (output
unloaded)
TA = 25°C
1.5
TA = 25°C
0.3
TMIN ≤ TA ≤ TMAX
TA = 25°C
TMIN ≤ TA ≤ TMAX
3.6
µW
0.8
5.5
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7.6 Timing Requirements
The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code
range 3 to 252. All other limits are at TA = 25°C, unless otherwise specified. (1)
MIN
TA = 25°C
fSCLK
SCLK frequency
ts
Output voltage settling time (2)
SR
Output slew rate
30
TA = 25°C
40h to C0h code change
RL = 2 kΩ, CL = 200 pF
UNIT
MHz
3
TMIN ≤ TA ≤ TMAX
µs
4.5
Code change from 80h to 7Fh
Digital feedthrough
Digital crosstalk
DAC-to-DAC crosstalk
1
V/µs
12
nV-sec
0.5
nV-sec
1
nV-sec
3
nV-sec
Multiplying bandwidth
VREFIN = 2.5 V ± 0.1 Vpp
160
kHz
Total harmonic distortion
VREFIN = 2.5 V ± 1 Vpp
input frequency = 10 kHz
70
dB
VA = 3 V
6
VA = 5 V
39
TA = 25°C
25
tWU
Wake-up time
1/fSCLK
SCLK cycle time
tCH
SCLK high time
tCL
SCLK low time
tSS
SYNC setup time prior to
SCLK falling edge
TA = 25°C
tDS
Data setup time prior to SCLK
falling edge
TA = 25°C
tDH
Data hold time after SCLK
falling edge
TA = 25°C
tCFSR
SCLK fall prior to rise of
SYNC
TA = 25°C
tSYNC
SYNC high time
(2)
MAX
40
TMIN ≤ TA ≤ TMAX
Glitch Impulse
(1)
TYP
TMIN ≤ TA ≤ TMAX
33
TA = 25°C
7
TMIN ≤ TA ≤ TMAX
10
TA = 25°C
7
TMIN ≤ TA ≤ TMAX
10
4
TMIN ≤ TA ≤ TMAX
10
1.5
TMIN ≤ TA ≤ TMAX
3.5
1.5
TMIN ≤ TA ≤ TMAX
3.5
0
TMIN ≤ TA ≤ TMAX
3
TA = 25°C
6
TMIN ≤ TA ≤ TMAX
10
µs
ns
ns
ns
ns
ns
ns
ns
ns
Typical figures are at TJ = 25°C, and represent most likely parametric norms. Test limits are specified to AOQL (Average Outgoing
Quality Level).
This parameter is specified by design or characterization and is not tested in production.
|
1 / fSCLK
SCLK
1
2
13
tSS
tSYNC
tCL
14
15
16
tCH
tCFSR
|
SYNC
DIN
| |
tDH
DB15
DB0
tDS
Figure 1. Serial Timing Diagram
8
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7.7 Typical Characteristics
VREF = VA, fSCLK = 30 MHz, TA = 25°C, Input Code Range 3 to 252, unless otherwise stated
FSE
255 x VREFIN
256
GE = FSE - ZE
FSE = GE + ZE
OUTPUT
VOLTAGE
ZE
0
0
255
DIGITAL INPUT CODE
Figure 2. Input and Output Transfer Characteristic
Figure 3. INL at VA = 3 V
Figure 4. INL at VA = 5 V
Figure 5. DNL at VA = 3 V
Figure 6. DNL at VA = 5 V
Figure 7. INL/DNL vs VREFIN at VA = 3 V
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Typical Characteristics (continued)
VREF = VA, fSCLK = 30 MHz, TA = 25°C, Input Code Range 3 to 252, unless otherwise stated
10
Figure 8. INL/DNL vs VREFIN at VA = 5 V
Figure 9. INL/DNL vs fSCLK at VA = 2.7 V
Figure 10. INL/DNL vs VA
Figure 11. INL/DNL vs Clock Duty Cycle at VA = 3 V
Figure 12. INL/DNL vs Clock Duty Cycle at VA = 5 V
Figure 13. INL/DNL vs Temperature at VA = 3 V
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Typical Characteristics (continued)
VREF = VA, fSCLK = 30 MHz, TA = 25°C, Input Code Range 3 to 252, unless otherwise stated
Figure 14. INL/DNL vs Temperature at VA = 5 V
Figure 15. Zero Code Error vs VA
Figure 16. Zero Code Error vs VREFIN
Figure 17. Zero Code Error vs fSCLK
Figure 18. Zero Code Error vs Clock Duty Cycle
Figure 19. Zero Code Error vs Temperature
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Typical Characteristics (continued)
VREF = VA, fSCLK = 30 MHz, TA = 25°C, Input Code Range 3 to 252, unless otherwise stated
12
Figure 20. Full-Scale Error vs VA
Figure 21. Full-Scale Error vs VREFIN
Figure 22. Full-Scale Error vs fSCLK
Figure 23. Full-Scale Error vs Clock Duty Cycle
Figure 24. Full-Scale Error vs Temperature
Figure 25. Supply Current vs VA
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Typical Characteristics (continued)
VREF = VA, fSCLK = 30 MHz, TA = 25°C, Input Code Range 3 to 252, unless otherwise stated
Figure 26. Supply Current vs Temperature
Figure 27. 5-V Glitch Response
Figure 28. Power-On Reset
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8 Detailed Description
8.1 Overview
The DAC082S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor
strings that are followed by an output buffer.
8.2 Functional Block Diagram
V REFIN
DAC082S085
REF
POWER-ON
RESET
8 BIT DAC
BUFFER
V OUTA
8
2.5 kŸ
100 kŸ
REF
DAC
REGISTER
8 BIT DAC
BUFFER
V OUTB
8
2.5 kŸ
8
POWER -DOWN
CONTROL
LOGIC
INPUT
CONTROL
LOGIC
SCLK
SYNC
100 kŸ
DIN
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8.2.1 Feature Description
8.2.1.1 DAC Architecture
The DAC082S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor
strings that are followed by an output buffer. The reference voltage is externally applied at VREFIN and is shared
by both DACs.
For simplicity, a single resistor string is shown in Figure 29. This string consists of 256 equal valued resistors
with a switch at each junction of two resistors, plus a switch to ground. The code loaded into the DAC register
determines which switch is closed, connecting the proper node to the amplifier. The input coding is straight
binary with an ideal output voltage calculated in Equation 1:
VOUTA,B = VREFIN × (D / 256)
where
•
14
D is the decimal equivalent of the binary code that is loaded into the DAC register. (D can take on any value
between 0 and 255. This configuration ensures that the DAC is monotonic.)
(1)
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Functional Block Diagram (continued)
VA
R
R
R
To Output Amplifier
R
R
Figure 29. DAC Resistor String
8.2.1.2 Output Amplifiers
The output amplifiers are rail-to-rail, providing an output voltage range of 0 V to VA when the reference is VA. All
amplifiers, even rail-to-rail types, exhibit a loss of linearity as the output approaches the supply rails (0 V and VA,
in this case). For this reason, linearity is specified over less than the full output range of the DAC. However, if the
reference is less than VA, there is only a loss in linearity in the lowest codes. The output capabilities of the
amplifier are described in Electrical Characteristics.
The output amplifiers are capable of driving a load of 2 kΩ in parallel with 1500 pF to ground or to VA. The zerocode and full-scale outputs for given load currents are available in the Electrical Characteristics.
8.2.1.3 Reference Voltage
The DAC082S085 uses a single external reference that is shared by both channels. The reference pin, VREFIN, is
not buffered and has an input impedance of 60 kΩ. TI recommends that VREFIN be driven by a voltage source
with low output impedance. The reference voltage range is 1 V to VA, providing the widest possible output
dynamic range.
8.2.1.4 Power-On Reset
The power-on reset circuit controls the output voltages of both DACs during power-up. Upon application of
power, the DAC registers are filled with zeros and the output voltages are 0 V. The outputs remain at 0 V until a
valid write sequence is made to the DAC.
8.3 Device Functional Modes
8.3.1 Power-Down Modes
The DAC082S085 has four power-down modes, two of which are identical. In power-down mode, the supply
current drops to 20 µA at 3 V and 30 µA at 5 V. The DAC082S085 is set in power-down mode by setting OP1
and OP0 to 11. Because this mode powers down both DACs, the first two bits of the shift register are used to
select different output terminations for the DAC outputs. Setting A1 and A0 to 00 or 11 causes the outputs to be
tri-stated (a high impedance state). While setting A1 and A0 to 01 or 10 causes the outputs to be terminated by
2.5 kΩ or 100 kΩ to ground respectively (see Table 1).
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Device Functional Modes (continued)
Table 1. Power-Down Modes
A1
A0
OP1
OP0
0
0
1
1
OPERATING MODE
High-Z outputs
0
1
1
1
2.5 kΩ to GND
1
0
1
1
100 kΩ to GND
1
1
1
1
High-Z outputs
The bias generator, output amplifiers, resistor strings, and other linear circuitry are all shut down in any of the
power-down modes. However, the contents of the DAC registers are unaffected when in power-down. Each DAC
register maintains its value prior to the DAC082S085 being powered down unless it is changed during the write
sequence which instructed it to recover from power down. Minimum power consumption is achieved in the
power-down mode with SYNC and DIN idled low and SCLK disabled. The time to exit power-down (Wake-Up
Time) is typically tWU µs as stated in Timing Requirements.
8.4 Programming
8.4.1 Serial Interface
The three-wire interface is compatible with SPI™, QSPI, and MICROWIRE, as well as most DSPs and operates
at clock rates up to 40 MHz. See Figure 1 for information on a write sequence.
A write sequence begins by bringing the SYNC line low. Once SYNC is low, the data on the DIN line is clocked
into the 16-bit serial input register on the falling edges of SCLK. To avoid misclocking data into the shift register,
it is critical that SYNC not be brought low simultaneously with a falling edge of SCLK (see Figure 1). On the 16th
falling clock edge, the last data bit is clocked in and the programmed function (a change in the DAC channel
address, mode of operation or register contents) is executed. At this point the SYNC line may be kept low or
brought high. Any data and clock pusles after the 16th falling clock edge are ignored. In either case, SYNC must
be brought high for the minimum specified time before the next write sequence is initiated with a falling edge of
SYNC.
Because the SYNC and DIN buffers draw more current when they are high, they must be idled low between write
sequences to minimize power consumption.
8.4.2 Input Shift Register
The input shift register, Figure 30, has sixteen bits. The first bit must be set to 0 and the second bit is an address
bit. The address bit determines whether the register data is for DAC A or DAC B. This bit is followed by two bits
that determine the mode of operation (writing to a DAC register without updating the outputs of both DACs,
writing to a DAC register and updating the outputs of both DACs, writing to the register of both DACs and
updating their outputs, or powering down both outputs). The final twelve bits of the shift register are the data bits.
The data format is straight binary (MSB first, LSB last), with all 0s corresponding to an output of 0 V and all 1s
corresponding to a full-scale output of VREFIN – 1 LSB. The contents of the serial input register are transferred to
the DAC register on the sixteenth falling edge of SCLK. See Figure 1.
LSB
MSB
A1
A0 OP1 OP0 D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
DATA BITS
0 0 DAC A
0 1 DAC B
0
0
1
1
0
1
0
1
Write to specified register but do not update outputs.
Write to specified register and update outputs.
Write to all registers and update outputs.
Power-down outputs.
Figure 30. Input Register Contents
Normally, the SYNC line is kept low for at least 16 falling edges of SCLK and the DAC is updated on the 16th
SCLK falling edge. However, if SYNC is brought high before the 16th falling edge, the data transfer to the shift
register is aborted and the write sequence is invalid. Under this condition, the DAC register is not updated and
there is no change in the mode of operation or in the DAC output voltages.
16
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Programming (continued)
8.4.3 DSP and Microprocessor Interfacing
Interfacing the DAC082S085 to microprocessors and DSPs is quite simple. The following guidelines are offered
to hasten the design process.
8.4.3.1 ADSP-2101/ADSP2103 Interfacing
Figure 31 shows a serial interface between the DAC082S085 and the ADSP-2101/ADSP2103. The DSP must be
set to operate in the SPORT Transmit Alternate Framing Mode. It is programmed through the SPORT control
register and must be configured for Internal Clock Operation, Active Low Framing and 16-bit Word Length.
Transmission is started by writing a word to the TX register after the SPORT mode has been enabled.
ADSP-2101/
ADSP2103
TFS
DT
SCLK
DAC082S085
SYNC
DIN
SCLK
Figure 31. ADSP-2101/2103 Interface
8.4.3.2 80C51/80L51 Interface
A serial interface between the DAC082S085 and the 80C51/80L51 microcontroller is shown in Figure 32. The
SYNC signal comes from a bit-programmable pin on the microcontroller. The example shown here uses port line
P3.3. This line is taken low when data is transmitted to the DAC082S085. Because the 80C51/80L51 transmits
8-bit bytes, only eight falling clock edges occur in the transmit cycle. To load data into the DAC, the P3.3 line
must be left low after the first eight bits are transmitted. A second write cycle is initiated to transmit the second
byte of data, after which port line P3.3 is brought high. The 80C51/80L51 transmit routine must recognize that
the 80C51/80L51 transmits data with the LSB first while the DAC082S085 requires data with the MSB first.
80C51/80L51
DAC082S085
P3.3
SYNC
TXD
SCLK
RXD
DIN
Figure 32. 80C51/80L51 Interface
8.4.3.3 68HC11 Interface
A serial interface between the DAC082S085 and the 68HC11 microcontroller is shown in Figure 33. The SYNC
line of the DAC082S085 is driven from a port line (PC7 in the figure), similar to the 80C51/80L51.
The 68HC11 must be configured with its CPOL bit as a zero and its CPHA bit as a one. This configuration
causes data on the MOSI output to be valid on the falling edge of SCLK. PC7 is taken low to transmit data to the
DAC. The 68HC11 transmits data in 8-bit bytes with eight falling clock edges. Data is transmitted with the MSB
first. PC7 must remain low after the first eight bits are transferred. A second write cycle is initiated to transmit the
second byte of data to the DAC, after which PC7 must be raised to end the write sequence.
68HC11
DAC082S085
PC7
SYNC
SCK
SCLK
MOSI
DIN
Figure 33. 68HC11 Interface
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Programming (continued)
8.4.3.4 Microwire Interface
Figure 34 shows an interface between a Microwire-compatible device and the DAC082S085. Data is clocked out
on the rising edges of the SK signal. As a result, the SK of the Microwire device must be inverted before driving
the SCLK of the DAC082S085.
MICROWIRE
DEVICE
CS
SYNC
SK
SCLK
SO
DIN
DAC082S085
Figure 34. Microwire Interface
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DAC082S085 is designed for single-supply operation and thus has a unipolar output. However, a bipolar
output may be obtained with the circuit in Figure 35. This circuit provides an output voltage range of ±5 V. A railto-rail amplifier must be used if the amplifier supplies are limited to ±5 V.
9.2 Typical Application
9.2.1 Bipolar Operation
10 pF
R2
+5V
+5V
10 PF
+
R1
±
+
0.1 PF
±5V
DAC102S085
-5V
SYNC
VOUT
DIN
SCLK
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Figure 35. Bipolar Operation
9.2.1.1 Design Requirements
•
•
•
18
The DAC082S085 uses a single supply.
The output is required to be bipolar with a voltage range of ±5 V.
Dual supplies are used for the output amplifier.
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Typical Application (continued)
9.2.1.2 Detailed Design Procedure
The output voltage of this circuit for any code is found to be
VO = (VA × (D / 256) × ((R1 + R2) / R1) – VA × R2 / R1)
VO = (10 × D / 256) – 5 V
(2)
where
•
D is the input code in decimal form (With VA = 5 V and R1 = R2)
(3)
Table 2 lists the rail-to-rail amplifiers suitable for this application.
Table 2. Some Rail-to-Rail Amplifiers
AMP
PKGS
LMC7111
8-pin PDIP, 5-pin SOT-23
0.9 mV
TYP VOS
TYP ISUPPLY
25 µA
LM7301
8-pin SO, 5-pin SOT-23
0.03 mV
620 µA
LM8261
5-pin SOT-23
0.7 mV
1 mA
9.2.1.3 Application Curve
5V
OUTPUT
VOLTAGE
-5V
0
255
DIGITAL INPUT CODE
Figure 36. Bipolar Input / Output Transfer Characteristic
10 Power Supply Recommendations
While the simplicity of the DAC082S085 implies ease of use, it is important to recognize that the path from the
reference input (VREFIN) to the VOUTs has essentially zero Power Supply Rejection Ratio (PSRR). Therefore, it is
necessary to provide a noise-free supply voltage to VREFIN. To use the full dynamic range of the DAC082S085,
the supply pin (VA) and VREFIN can be connected together and share the same supply voltage.
10.1 Using References as Power Supplies
Because the DAC082S085 consumes very little power, a reference source may be used as the reference input or
the supply voltage. The advantages of using a reference source over a voltage regulator are accuracy and
stability. Some low noise regulators can also be used. Listed below are a few reference and power supply
options for the DAC082S085.
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Using References as Power Supplies (continued)
10.1.1 LM4130
The LM4130, with its 0.05% accuracy over temperature, is a good choice as a reference source for the
DAC082S085. The 4.096-V version is useful if a 0 to 4.095-V output range is desirable or acceptable. Bypassing
the LM4130 VIN pin with a 0.1-µF capacitor and the VOUT pin with a 2.2-µF capacitor improves stability and
reduces output noise. The LM4130 comes in a space-saving, 5-pin SOT-23.
Input
Voltage
LM4132-4.1
C1
0.1 PF
C3
0.1 PF
C2
2.2 PF
VA VREFIN
DAC082S085
VOUT = 0V to 4.092V
SYNC
DIN
SCLK
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Figure 37. The LM4130 as a Power Supply
10.1.2 LM4050
Available with accuracy of 0.44%, the LM4050 shunt reference is also a good choice as a reference for the
DAC082S085. It is available in 4.096-V and 5-V versions and comes in a space-saving, 3-pin SOT-23.
Input
Voltage
R
VZ
IDAC
IZ
0.1 PF
0.47 PF
LM4050-4.1
or
LM4050-5.0
VA VREFIN
DAC082S085
VOUT = 0V to 5V
SYNC
DIN
SCLK
Copyright © 2016, Texas Instruments Incorporated
Figure 38. The LM4050 as a Power Supply
The minimum resistor value in the circuit of Figure 38 must be chosen such that the maximum current through
the LM4050 does not exceed its 15-mA rating. The conditions for maximum current include the input voltage at
its maximum, the LM4050 voltage at its minimum, and the DAC082S085 drawing zero current. The maximum
resistor value must allow the LM4050 to draw more than its minimum current for regulation plus the maximum
DAC082S085 current in full operation. The conditions for minimum current include the input voltage at its
minimum, the LM4050 voltage at its maximum, the resistor value at its maximum due to tolerance, and the
DAC082S085 draws its maximum current. These conditions can be summarized in Equation 4 and Equation 5:
R(min) = ( VIN(max) − VZ(min) ) /IZ(max)
R(max) = ( VIN(min) − VZ(max) ) / ( (IDAC(max) + IZ(min) )
(4)
where
•
20
VZ(min) and VZ(max) are the nominal LM4050 output voltages ± the LM4050 output tolerance over
temperature
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Using References as Power Supplies (continued)
•
•
•
IZ(max) is the maximum allowable current through the LM4050
IZ(min) is the minimum current required by the LM4050 for proper regulation
IDAC(max) is the maximum DAC082S085 supply current
(5)
10.1.3 LP3985
The LP3985 is a low-noise, ultra-low dropout voltage regulator with a 3% accuracy over temperature. It is a good
choice for applications that do not require a precision reference for the DAC082S085. It comes in 3-V, 3.3-V, and
5-V versions, among others, and sports a low 30-µV noise specification at low frequencies. Because low
frequency noise is relatively difficult to filter, this specification could be important for some applications. The
LP3985 comes in a space-saving, 5-pin SOT-23 and 5-bump DSBGA packages.
Input
Voltage
LP3985
0.1 PF
1 PF
0.1 PF
VA VREFIN
0.01 PF
DAC082S085
VOUT = 0V to 5V
SYNC
DIN
SCLK
Copyright © 2016, Texas Instruments Incorporated
Figure 39. Using the LP3985 Regulator
An input capacitance of 1 µF without any ESR requirement is required at the LP3985 input, while a 1-µF ceramic
capacitor with an ESR requirement of 5 mΩ to 500 mΩ is required at the output. Careful interpretation and
understanding of the capacitor specification is required to ensure correct device operation.
10.1.4 LP2980
The LP2980 is an ultra-low dropout regulator with a 0.5% or 1% accuracy over temperature, depending upon
grade. It is available in 3-V, 3.3-V, and 5-V versions, among others.
VIN
Input
Voltage
LP2980
ON /OFF
VOUT
1 PF
0.1 PF
VA VREFIN
DAC102S085
VOUT = 0V to 5V
SYNC
DIN
SCLK
Copyright © 2016, Texas Instruments Incorporated
Figure 40. Using the LP2980 Regulator
Like any low dropout regulator, the LP2980 requires an output capacitor for loop stability. This output capacitor
must be at least 1-µF over temperature, but values of 2.2 µF or more provide even better performance. The ESR
of this capacitor must be within the range specified in the LP2980 data sheet. Surface-mount solid tantalum
capacitors offer a good combination of small size and ESR. Ceramic capacitors are attractive due to their small
size but generally have ESR values that are too low for use with the LP2980. Aluminum electrolytic capacitors
are typically not a good choice due to their large size and have ESR values that may be too high at low
temperatures.
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11 Layout
11.1 Layout Guidelines
For best accuracy and minimum noise, the printed-circuit board containing the DAC082S085 must have separate
analog and digital areas. The areas are defined by the locations of the analog and digital power planes. Both of
these planes must be placed in the same board layer. There should be a single ground plane. A single ground
plane is preferred if digital return current does not flow through the analog ground area. Frequently a single
ground plane design uses a fencing technique to prevent the mixing of analog and digital ground current.
Separate ground planes must only be used when the fencing technique is inadequate. The separate ground
planes must be connected in one place, preferably near the DAC082S085. Take special care to ensure that
digital signals with fast edge rates do not pass over split ground planes. They must always have a continuous
return path below their traces.
The DAC082S085 power supply must be bypassed with a 10-µF and a 0.1-µF capacitor as close as possible to
the device with the 0.1 µF right at the device supply pin. The 10-µF capacitor must be a tantalum type and the
0.1-µF capacitor must be a low ESL, low ESR type. The power supply for the DAC082S085 must only be used
for analog circuits.
Avoid crossover of analog and digital signals and keep the clock and data lines on the component side of the
board. The clock and data lines must have controlled impedances.
11.2 Layout Example
Figure 41. DAC082S085 Layout Example
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12 Device and Documentation Support
12.1 Device Support
12.1.1 Device Nomenclature
12.1.1.1 Specification Definitions
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1
LSB, which is VREF / 256 = VA / 256.
DAC-to-DAC CROSSTALK is the glitch impulse transferred to a DAC output in response to a full-scale change
in the output of another DAC.
DIGITAL CROSSTALK is the glitch impulse transferred to a DAC output at mid-scale in response to a full-scale
change in the input register of another DAC.
DIGITAL FEEDTHROUGH is a measure of the energy injected into the analog output of the DAC from the digital
inputs when the DAC outputs are not updated. It is measured with a full-scale code change on the data bus.
FULL-SCALE ERROR is the difference between the actual output voltage with a full scale code (FFFh) loaded
into the DAC and the value of VA × 255 / 256.
GAIN ERROR is the deviation from the ideal slope of the transfer function. It can be calculated from Zero and
Full-Scale Errors as GE = FSE – ZE, where GE is Gain error, FSE is Full-Scale Error and ZE is Zero Error.
GLITCH IMPULSE is the energy injected into the analog output when the input code to the DAC register
changes. It is specified as the area of the glitch in nanovolt-seconds.
INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a straight line
through the input to output transfer function. The deviation of any given code from this straight line is measured
from the center of that code value. The end point method is used. INL for this product is specified over a limited
range, per the electrical tables.
LEAST SIGNIFICANT BIT (LSB) is the bit that has the smallest value or weight of all bits in a word. This value is
LSB = VREF / 2n
where
•
•
VREF is the supply voltage for this product
n is the DAC resolution in bits, which is 8 for the DAC082S085
(6)
MAXIMUM LOAD CAPACITANCE is the maximum capacitance that can be driven by the DAC with output
stability maintained.
MONOTONICITY is the condition of being monotonic, where the DAC has an output that never decreases when
the input code increases.
MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight of all bits in a word. Its value is
1/2 of VA.
MULTIPLYING BANDWIDTH is the frequency at which the output amplitude falls 3 dB below the input sine wave
on VREFIN with a full-scale code loaded into the DAC.
POWER EFFICIENCY is the ratio of the output current to the total supply current. The output current comes from
the power supply. The difference between the supply and output currents is the power consumed by the device
without a load.
SETTLING TIME is the time for the output to settle to within 1/2 LSB of the final value after the input code is
updated.
TOTAL HARMONIC DISTORTION (THD) is the measure of the harmonics present at the output of the DACs
with an ideal sine wave applied to VREFIN. THD is measured in dB.
WAKE-UP TIME is the time for the output to exit power-down mode. This is the time from the falling edge of the
16th SCLK pulse to when the output voltage deviates from the power-down voltage of 0 V.
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Device Support (continued)
ZERO CODE ERROR is the output error, or voltage, present at the DAC output after a code of 000h has been
entered.
12.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.3 Community Resource
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
SPI is a trademark of Motorola, Inc..
All other trademarks are the property of their respective owners.
12.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
24
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PACKAGE OPTION ADDENDUM
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6-Feb-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
DAC082S085CIMM/NOPB
ACTIVE
VSSOP
DGS
10
1000
Green (RoHS
& no Sb/Br)
SN
Level-1-260C-UNLIM
-40 to 105
X76C
DAC082S085CIMMX/NOPB
ACTIVE
VSSOP
DGS
10
3500
Green (RoHS
& no Sb/Br)
SN
Level-1-260C-UNLIM
-40 to 105
X76C
DAC082S085CISD/NOPB
ACTIVE
WSON
DSC
10
1000
Green (RoHS
& no Sb/Br)
SN
Level-1-260C-UNLIM
-40 to 105
X77C
DAC082S085CISDX/NOPB
ACTIVE
WSON
DSC
10
4500
Green (RoHS
& no Sb/Br)
SN
Level-1-260C-UNLIM
-40 to 105
X77C
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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