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PDF DAC084S085 Data sheet ( Hoja de datos )
| Número de pieza | DAC084S085 | |
| Descripción | 8-Bit Micro Power QUAD Digital-to-Analog Converter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DAC084S085 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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www.DataSheet4U.com
June 2006
DAC084S085
8-Bit Micro Power QUAD Digital-to-Analog Converter
with Rail-to-Rail Output
General Description
The DAC084S085 is a full-featured, general purpose QUAD
8-bit voltage-output digital-to-analog converter (DAC) that
can operate from a single +2.7V to 5.5V supply and uses
370 µA at 3V and 500 µA at 5V. The DAC084S085 is
packaged in a 10-lead MSOP package. 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 2.7V to 3.6V
range. The serial interface is compatible with standard
SPI™, QSPI, MICROWIRE and DSP interfaces.
The reference for the DAC084S085 serves all four channels
and can vary in voltage between 1V and VA, providing the
widest possible output dynamic range. The DAC084S085
has a 16-bit input shift register that controls the outputs to be
updated, the mode of operation, the powerdown condition,
and the binary input data. All four 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 zero volts and remains there until there is a valid write
to the device. A power-down feature reduces power con-
sumption to less than a microWatt with three different termi-
nation options.
The low power consumption and small packages of the
DAC084S085 make it an excellent choice for use in battery
operated equipment.
The DAC084S085 is one of a family of pin compatible DACs,
including the 10-bit DAC104S085 and the 12-bit
DAC124S085. The DAC084S085 operates over the ex-
tended industrial temperature range of −40˚C to +105˚C.
Features
n Guaranteed Monotonicity
n Low Power Operation
n Rail-to-Rail Voltage Output
n Power-on Reset to 0V
n Simultaneous Output Updating
n Wide power supply range (+2.7V to +5.5V)
n Power Down Modes
Key Specifications
n Resolution
n INL
n DNL
n Settling Time
n Zero Code Error
n Full-Scale Error
n Supply Current
— Normal
— Pwr Down
8 bits
±0.5 LSB (max)
+0.18 / −0.13 LSB (max)
4.5 µs (max)
+15 mV (max)
−0.75 %FS (max)
485 µA (3.6V) / 650 µA (5.5V) max
20 nA (3.6V) / 30 nA (5.5V) typ
Applications
n Battery-Powered Instruments
n Digital Gain and Offset Adjustment
n Programmable Voltage & Current Sources
n Programmable Attenuators
Pin Configuration
20195402
SPI™ is a trademark of Motorola, Inc.
© 2006 National Semiconductor Corporation DS201954
www.national.com
1 page  
Electrical Characteristics (Continued)
Values shown in this table are design targets and are subject to change before product release. The following specifica-
tions apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 3 to 252. Boldface
limits apply for TMIN ≤ TA ≤ TMAX and all other limits are at TA = 25˚C, unless otherwise specified.
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9)
Units
(Limits)
VA = 3V, VOUT = 0V,
Input Code = FFh
-56
mA
VA = 5V, VOUT = 0V,
Input Code = FFh
IOS
Output Short Circuit Current
VA = 3V, VOUT = 5V,
Input Code = 00h
-69
52
mA
mA
VA = 5V, VOUT = 5V,
Input Code = 00h
75
mA
Continuous Output
IO Current (Note 10)
Avaliable on each DAC output
11 mA (max)
CL Maximum Load Capacitance
ZOUT
DC Output Impedance
REFERENCE INPUT CHARACTERISTICS
RL = ∞
RL = 2kΩ
1500
1500
7.5
pF
pF
Ω
Input Range Minimum
0.2 1.0 V (min)
VREFIN
Input Range Maximum
Input Impedance
VA V (max)
30 kΩ
LOGIC INPUT CHARACTERISTICS
IIN Input Current (Note 10)
VIL Input Low Voltage (Note 10)
VIH Input High Voltage (Note 10)
CIN Input Capacitance (Note 10)
POWER REQUIREMENTS
VA = 3V
VA = 5V
VA = 3V
VA = 5V
±1 µA (max)
0.9 0.6 V (max)
1.5 0.8 V (max)
1.4 2.1 V (min)
2.1 2.4 V (min)
3 pF (max)
Supply Voltage Minimum
VA Supply Voltage Maximum
2.7 V (min)
5.5 V (max)
fSCLK = 30 MHz
Normal Supply Current (output
IN unloaded)
fSCLK = 0
VA = 2.7V
to 3.6V
VA = 4.5V
to 5.5V
VA = 2.7V
to 3.6V
VA = 4.5V
to 5.5V
370
500
350
460
485 µA (max)
650 µA (max)
µA (max)
µA (max)
All PD Modes,
VA = 2.7V
to 3.6V
0.02
µA (max)
Power Down Supply Current
fSCLK = 30 MHz
IPD (output unloaded, SYNC = 0V
after PD mode loaded)
All PD Modes,
VA = 4.5V
to 5.5V
VA = 2.7V
to 3.6V
0.03
0.015
µA (max)
1.0 µA (max)
fSCLK = 0 (Note 10)
VA = 4.5V
to 5.5V
0.025
1.0 µA (max)
5 www.national.com
5 Page 
Typical Performance Characteristics VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 3 to
252, unless otherwise stated (Continued)
Zero Code Error vs. VA
Zero Code Error vs. VREFIN
20195430
Zero Code Error vs. fSCLK
20195431
Zero Code Error vs. Clock Duty Cycle
20195434
Zero Code Error vs. Temperature
Full-Scale Error vs. VA
20195435
20195436
11
20195437
www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet DAC084S085.PDF ] | |
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