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ADCS7476AIMF Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADCS7476AIMF
Beschreibung 1MSPS/ 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 22 Seiten
ADCS7476AIMF Datasheet, Funktion
June 2003
ADCS7476/ADCS7477/ADCS7478
1MSPS, 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23
General Description
The ADCS7476, ADCS7477, and ADCS7478 are low power,
monolithic CMOS 12-, 10- and 8-bit analog-to-digital con-
verters that operate at 1 MSPS. The ADCS7476/77/78 are
drop-in replacements for Analog Devices’ AD7476/77/78.
Each device is based on a successive approximation regis-
ter architecture with internal track-and-hold. The serial inter-
face is compatible with several standards, such as SPI,
QSPI, MICROWIRE, and many common DSP serial in-
terfaces.
The ADCS7476/77/78 uses the supply voltage as a refer-
ence. 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 converters offer a
shutdown mode, which can be used to trade throughput for
power consumption. The ADCS7476/77/78 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 packaged in a 6-lead,
SOT-23 package that provides an extremely small footprint
for applications where space is a critical consideration.
These products are designed for operation over the
automotive/extended industrial 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
20057701
MICROWIREis a trademark of National Semiconductor Corporation.
TRI-STATE® is a trademark of National Semiconductor Corporation.
QSPIand SPIare trademarks of Motorola, Inc.
© 2003 National Semiconductor Corporation DS200577
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ADCS7476AIMF Datasheet, Funktion
ADCS7476/ADCS7477/ADCS7478 Specifications(Note 2) (Continued)
ADCS7477 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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ADCS7476AIMF pdf, datenblatt
Timing Diagrams (Continued)
FIGURE 3. ADCS7478 Serial Interface Timing Diagram
20057704
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