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September 2007
DAC128S085
12-Bit Micro Power OCTAL Digital-to-Analog Converter
with Rail-to-Rail Outputs
General Description
The DAC128S085 is a full-featured, general purpose OCTAL
12-bit voltage-output digital-to-analog converter (DAC) that
can operate from a single +2.7V to +5.5V supply and con-
sumes 1.95 mW at 3V and 4.85 mW at 5V. The DAC128S085
is packaged in a 16-lead LLP package and a 16-lead TSSOP
package. The LLP package makes the DAC128S085 the
smallest OCTAL DAC in its class. The on-chip output ampli-
fiers allow 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 2.7V to 3.6V range.
The serial interface is compatible with standard SPI™, QSPI,
MICROWIRE and DSP interfaces. The DAC128S085 also of-
fers daisy chain operation where an unlimited number of
DAC128S085s can be updated simultaneously using a single
serial interface.
There are two references for the DAC128S085. One refer-
ence input serves channels A through D while the other
reference serves channels E through H. Each reference can
be set independently between 0.5V and V
A
, providing the
widest possible output dynamic range. The DAC128S085 has
a 16-bit input shift register that controls the mode of operation,
the power-down condition, and the DAC channels' register/
output value. All eight DAC outputs can be updated simulta-
neously or individually.
A power-on reset circuit ensures that the DAC outputs power
up to zero volts and remain there until there is a valid write to
the device. The power-down feature of the DAC128S085 al-
lows each DAC to be independently powered with three dif-
ferent termination options. With all the DAC channels
powered down, power consumption reduces to less than 0.3
µW at 3V and less than 1 µW at 5V. The low power consump-
tion and small packages of the DAC128S085 make it an
excellent choice for use in battery operated equipment.
The DAC128S085 is one of a family of pin compatible DACs,
including the 8-bit DAC088S085 and the 10-bit DAC108S085.
All three parts are offered with the same pinout, allowing sys-
tem designers to select a resolution appropriate for their
application without redesigning their printed circuit board. The
DAC128S085 operates over the extended industrial temper-
ature range of −40°C to +125°C.
Features
■
Guaranteed Monotonicity
■
Low Power Operation
■
Rail-to-Rail Voltage Output
■
Daisy Chain Capability
■
Power-on Reset to 0V
■
Simultaneous Output Updating
■
Individual Channel Power Down Capability
■
Wide power supply range (+2.7V to +5.5V)
■
Dual Reference Voltages with range of 0.5V to V
A
■
Operating Temperature Range of −40°C to +125°C
■
Industry's Smallest Package
Key Specifications
■
Resolution 12 bits
■
INL ±8 LSB (max)
■
DNL +0.75 / −0.4 LSB (max)
■
Settling Time 8.5 µs (max)
■
Zero Code Error +15 mV (max)
■
Full-Scale Error −0.75 %FSR (max)
■
Supply Power
■
—
Normal 1.95 mW (3V) / 4.85 mW (5V) typ
—
Power Down 0.3 µW (3V) / 1 µW (5V) typ
Applications
■
Battery-Powered Instruments
■
Digital Gain and Offset Adjustment
■
Programmable Voltage & Current Sources
■
Programmable Attenuators
■
Voltage Reference for ADCs
■
Sensor Supply Voltage
■
Range Detectors
Ordering Information
Order Numbers Temperature Range Package Top Mark
DAC128S085CISQ
−40°C ≤ T
A
≤ +125°C
16-Lead LLP
DAC128S085CISQX
−40°C ≤ T
A
≤ +125°C
LLP Tape-and-Reel
DAC128S085CIMT
−40°C ≤ T
A
≤ +125°C
16-Lead TSSOP X78C
DAC128S085CIMTX
−40°C ≤ T
A
≤ +125°C
TSSOP Tape-and-Reel X78C
DAC128S085EB Evaluation Board - BOTH
SPI™ is a trademark of Motorola, Inc.
© 2007 National Semiconductor Corporation 300169 www.national.com
DAC128S085 12-Bit Micro Power OCTAL Digital-to-Analog Converter with Rail-to-Rail Outputs
Block Diagram
30016903
www.national.com 2
DAC128S085
Pin Configuration
30016901
30016902
Pin Descriptions
LLP
Pin No.
TSSOP
Pin No.
Symbol Type Description
1 3
V
OUTA
Analog Output Channel A Analog Output Voltage.
2 4
V
OUTB
Analog Output Channel B Analog Output Voltage.
3 5
V
OUTC
Analog Output Channel C Analog Output Voltage.
4 6
V
OUTD
Analog Output Channel D Analog Output Voltage.
5 7
V
A
Supply Power supply input. Must be decoupled to GND.
6 8
V
REF1
Analog Input
Unbuffered reference voltage shared by Channels A, B, C, and D.
Must be decoupled to GND.
7 9
V
REF2
Analog Input
Unbuffered reference voltage shared by Channels E, F, G, and H.
Must be decoupled to GND.
8 10 GND Ground Ground reference for all on-chip circuitry.
9 11
V
OUTH
Analog Output Channel H Analog Output Voltage.
10 12
V
OUTG
Analog Output Channel G Analog Output Voltage.
11 13
V
OUTF
Analog Output Channel F Analog Output Voltage.
12 14
V
OUTE
Analog Output Channel E Analog Output Voltage.
13 15 SYNC Digital Input
Frame Synchronization Input. When this pin goes low, data is
written into the DAC's input shift register on the falling edges of
SCLK. After the 16th falling edge of SCLK, a rising edge of SYNC
causes the DAC to be updated. If SYNC is brought high before the
15th falling edge of SCLK, the rising edge of SYNC acts as an
interrupt and the write sequence is ignored by the DAC.
14 16 SCLK Digital Input
Serial Clock Input. Data is clocked into the input shift register on
the falling edges of this pin.
15 1
D
IN
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.
16 2
D
OUT
Digital Output
Serial Data Output. D
OUT
is utilized in daisy chain operation and is
connected directly to a D
IN
pin on another DAC128S085. Data is
not available at D
OUT
unless SYNC remains low for more than 16
SCLK cycles.
17
PAD
(LLP only)
Ground
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.
3 www.national.com
DAC128S085
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V
A
6.5V
Voltage on any Input Pin −0.3V to 6.5V
Input Current at Any Pin (Note 3) 10 mA
Package Input Current (Note 3) 30 mA
Power Consumption at T
A
= 25°C
See (Note 4)
ESD Susceptibility (Note 5)
Human Body Model
Machine Model
Charge Device Mode
2500V
250V
1000V
Junction Temperature +150°C
Storage Temperature −65°C to +150°C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
−40°C ≤ T
A
≤ +125°C
Supply Voltage, V
A
+2.7V to 5.5V
Reference Voltage, V
REF1,2
+0.5V to V
A
Digital Input Voltage (Note 7) 0.0V to 5.5V
Output Load 0 to 1500 pF
SCLK Frequency Up to 40 MHz
Package Thermal Resistances
Package
θ
JA
16-Lead LLP 38°C/W
16-Lead TSSOP 130°C/W
Soldering process must comply with National
Semiconductor's Reflow Temperature Profile specifications.
Refer to www.national.com/packaging. (Note 6)
Electrical Characteristics
The following specifications apply for V
A
= +2.7V to +5.5V, V
REF1
= V
REF2
= V
A
, C
L
= 200 pF to GND, f
SCLK
= 30 MHz, input code
range 48 to 4047. Boldface limits apply for T
MIN
≤ T
A
≤ T
MAX
and all other limits are at T
A
= 25°C, unless otherwise specified.
Symbol Parameter Conditions Typical
Limits
(Note 8)
Units
(Limits)
STATIC PERFORMANCE
Resolution 12 Bits (min)
Monotonicity 12 Bits (min)
INL Integral Non-Linearity ±2.0 ±8 LSB (max)
DNL Differential Non-Linearity
+0.15 +0.75 LSB (max)
−0.09 −0.4 LSB (min)
ZE Zero Code Error
I
OUT
= 0
+5 +15 mV (max)
FSE Full-Scale Error
I
OUT
= 0
−0.1 −0.75 % FSR (max)
GE Gain Error −0.2 −1.0 % FSR (max)
ZCED Zero Code Error Drift −20 µV/°C
TC GE Gain Error Tempco −1.0 ppm/°C
OUTPUT CHARACTERISTICS
Output Voltage Range
0
V
REF1,2
V (min)
V (max)
I
OZ
High-Impedance Output
Leakage Current (Note 9)
±1 µA (max)
ZCO Zero Code Output
V
A
= 3V, I
OUT
= 200 µA
10 mV
V
A
= 3V, I
OUT
= 1 mA
45 mV
V
A
= 5V, I
OUT
= 200 µA
8 mV
V
A
= 5V, I
OUT
= 1 mA
34 mV
FSO Full Scale Output
V
A
= 3V, I
OUT
= 200 µA
2.984 V
V
A
= 3V, I
OUT
= 1 mA
2.933 V
V
A
= 5V, I
OUT
= 200 µA
4.987 V
V
A
= 5V, I
OUT
= 1 mA
4.955 V
I
OS
Output Short Circuit Current
(source) (Note 10)
V
A
= 3V, V
OUT
= 0V,
Input Code = FFFh
−50 mA
V
A
= 5V, V
OUT
= 0V,
Input Code = FFFh
−60 mA
www.national.com 4
DAC128S085
Symbol Parameter Conditions Typical
Limits
(Note 8)
Units
(Limits)
I
OS
Output Short Circuit Current (sink)
(Note 10)
V
A
= 3V, V
OUT
= 3V,
Input Code = 000h
50 mA
V
A
= 5V, V
OUT
= 5V,
Input Code = 000h
70 mA
I
O
Continuous Output Current per
channel (Note 9)
T
A
= 105°C
10 mA (max)
T
A
= 125°C
6.5 mA (max)
C
L
Maximum Load Capacitance
R
L
= ∞
1500 pF
R
L
= 2kΩ
1500 pF
Z
OUT
DC Output Impedance 8
Ω
REFERENCE INPUT CHARACTERISTICS
VREF1,2
Input Range Minimum 0.5 2.7 V (min)
Input Range Maximum
V
A
V (max)
Input Impedance 30
kΩ
LOGIC INPUT CHARACTERISTICS
I
IN
Input Current (Note 9) ±1 µA (max)
V
IL
Input Low Voltage
V
A
= 2.7V to 3.6V
1.0 0.6 V (max)
V
A
= 4.5V to 5.5V
1.1 0.8 V (max)
V
IH
Input High Voltage
V
A
= 2.7V to 3.6V
1.4 2.1 V (min)
V
A
= 4.5V to 5.5V
2.0 2.4 V (min)
C
IN
Input Capacitance (Note 9) 3 pF (max)
POWER REQUIREMENTS
V
A
Supply Voltage Minimum 2.7 V (min)
Supply Voltage Maximum 5.5 V (max)
I
N
Normal Supply Current for supply
pin V
A
f
SCLK
= 30 MHz,
output unloaded
V
A
= 2.7V
to 3.6V
460 560 µA (max)
V
A
= 4.5V
to 5.5V
650 830 µA (max)
Normal Supply Current for V
REF1
or
V
REF2
f
SCLK
= 30 MHz,
output unloaded
V
A
= 2.7V
to 3.6V
95 130 µA (max)
V
A
= 4.5V
to 5.5V
160 220 µA (max)
I
ST
Static Supply Current for supply pin
V
A
f
SCLK
= 0,
output unloaded
V
A
= 2.7V
to 3.6V
370 µA
V
A
= 4.5V
to 5.5V
440 µA
Static Supply Current for V
REF1
or
V
REF2
f
SCLK
= 0,
output unloaded
V
A
= 2.7V
to 3.6V
95 µA
V
A
= 4.5V
to 5.5V
160 µA
I
PD
Total Power Down Supply Current
for all PD Modes
(Note 9)
f
SCLK
= 30 MHz, SYNC =
V
A
and D
IN
= 0V after PD
mode loaded
V
A
= 2.7V
to 3.6V
0.2 1.5 µA (max)
V
A
= 4.5V
to 5.5V
0.5 3.0 µA (max)
f
SCLK
= 0, SYNC = V
A
and
D
IN
= 0V after PD mode
loaded
V
A
= 2.7V
to 3.6V
0.1 1.0 µA (max)
V
A
= 4.5V
to 5.5V
0.2 2.0 µA (max)
5 www.national.com
DAC128S085
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