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ADC081S101 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC081S101
Beschreibung 1MSPS/ 12-/10-/8-Bit A/D Converters in SOT-23
Hersteller National Semiconductor
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Gesamt 22 Seiten
ADC081S101 Datasheet, Funktion
June 2004
ADC121S101/ADC101S101/ADC081S101
1MSPS, 12-/10-/8-Bit A/D Converters in SOT-23
General Description
The ADC121S101, ADC101S101, and ADC081S101 are low
power, monolithic CMOS 12-, 10- and 8-bit analog-to-digital
converters that operate at 1 MSPS. Each device is based on
a successive approximation register architecture with inter-
nal track-and-hold. The serial interface is compatible with
several standards, such as SPI, QSPI, MICROWIRE,
and many common DSP serial interfaces.
The ADC121S101/101S101/081S101 uses the supply volt-
age as a reference. This enables the devices to operate with
a full-scale input range of 0 to VDD. The conversion rate is
determined from the serial clock (SCLK) speed. These con-
verters offer a shutdown mode, which can be used to trade
throughput for power consumption. The ADC121S101/
101S101/081S101 is operated with a single supply that can
range from +2.7V to +5.25V. Normal power consumption
during continuous conversion, using a +3V or +5V supply, is
2 mW or 10 mW respectively. The power down feature,
which is enabled by a chip select (CS) pin, reduces the
power consumption to under 5 µW using a +5V supply. All
three converters are available in a 6-lead SOT-23 package,
which provides an extremely small footprint for applications
where space is a critical consideration. These products are
designed for operation over the automotive/extended indus-
trial temperature range of −40˚C to +125˚C.
Features
n Variable power management
n Packaged in 6-lead SOT-23
n Power supply used as reference
n Single +2.7V to +5.25V supply operation
n SPI/QSPI/MICROWIRE/DSP compatible
Key Specifications
n Resolution with no Missing Codes
n Conversion Rate
n DNL
n INL
n Power Consumption
— 3V Supply
— 5V Supply
12/10/8 bits
1 MSPS
+0.5, -0.3 LSB (typ)
± 0.4 LSB (typ)
2 mW (typ)
10 mW (typ)
Applications
n Automotive Navigation
n FA/ATM Equipment
n Portable Systems
n Medical Instruments
n Mobile Communications
n Instrumentation and Control Systems
Connection Diagram
20110201
MICROWIREis a trademark of National Semiconductor Corporation.
TRI-STATE® is a trademark of National Semiconductor Corporation.
QSPIand SPIare trademarks of Motorola, Inc.
© 2004 National Semiconductor Corporation DS201102
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ADC081S101 Datasheet, Funktion
ADC121S101/ADC101S101/ADC081S101 Specifications(Note 2) (Continued)
ADC101S101 Converter Electrical Characteristics (Continued)
The following specifications apply for VDD = +2.7V to 5.25V, fSCLK = 20 MHz, fSAMPLE = 1 MSPS unless otherwise noted. Bold-
face limits apply for TA = −40˚C to +85˚C: all other limits TA = 25˚C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical Limits
Units
DIGITAL OUTPUT CHARACTERISTICS
VOH
VOL
IOL
COUT
Output High Voltage
Output Low Voltage
TRI-STATE Leakage Current
TRI-STATE Output Capacitance
Output Coding
ISOURCE = 200 µA,
VDD = +2.7V to +5.25V
ISINK = 200 µA
VDD −0.2 V (min)
0.4 V (max)
±10 µA (max)
2 4 pF (max)
Straight (Natural) Binary
AC ELECTRICAL CHARACTERISTICS
fSCLK
DC
Clock Frequency
SCLK Duty Cycle
20 MHz (max)
40 % (min)
60 % (max)
tTH
fRATE
Track/Hold Acquisition Time
Throughput Rate
See Serial Interface Section
400 ns (max)
MSPS
1
(max)
tAD Aperture Delay
tAJ Aperture Jitter
3 ns
30 ps
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ADC081S101 pdf, datenblatt
Timing Diagrams (Continued)
FIGURE 3. ADC081S101 Serial Interface Timing Diagram
20110204
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