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ADCS7478AIMFX 데이터시트 PDF




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부품번호 ADCS7478AIMFX 기능
기능 1MSPS/ 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23
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ADCS7478AIMFX 데이터시트, 핀배열, 회로
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
www.national.com




ADCS7478AIMFX pdf, 반도체, 판매, 대치품
ADCS7476/ADCS7477/ADCS7478 Specifications(Note 2) (Continued)
ADCS7476 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
POWER SUPPLY CHARACTERISTICS
Normal Mode (Static)
VDD = +4.75V to +5.25V,
SCLK On or Off
VDD = +2.7V to +3.6V,
SCLK On or Off
2
1
mA
mA
IDD
Normal Mode (Operational)
Shutdown Mode
Power Consumption, Normal Mode
(Operational)
PD
Power Consumption, Shutdown Mode
ANALOG INPUT CHARACTERISTICS
VDD = +4.75V to +5.25V,
fSAMPLE = 1 MSPS
VDD = +2.7V to +3.6V,
fSAMPLE = 1 MSPS
VDD = +5V, SCLK Off
VDD = +5V, SCLK On
VDD = +5V, fSAMPLE = 1 MSPS
VDD = +3V, fSAMPLE = 1 MSPS
VDD = +5V, SCLK Off
VDD = +3V, SCLK Off
2.0 3.5 mA (max)
0.6 1.6 mA (max)
0.5 µA
60 µA
10
17.5
mW (max)
2 4.8 mW (max)
2.5 µW
1.5 µW
VIN Input Range
IDCL
DC Leakage Current
CINA
Analog Input Capacitance
DIGITAL INPUT CHARACTERISTICS
0 to VDD
30
±1
V
µA (max)
pF
VIH Input High Voltage
VIL Input Low Voltage
IIN Input Current
CIND
Digital Input Capacitance
DIGITAL OUTPUT CHARACTERISTICS
VDD = +5V
VDD = +3V
VIN = 0V or VDD
2.4 V (min)
0.8 V (max)
0.4 V (max)
±10 nA ±1 µA (max)
2 4 pF (max)
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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ADCS7478AIMFX 전자부품, 판매, 대치품
ADCS7476/ADCS7477/ADCS7478 Specifications(Note 2) (Continued)
ADCS7478 Converter Electrical Characteristics
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
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
8 Bits
INL Integral Non-Linearity
±0.05
±0.3 LSB (max)
DNL
Differential Non-Linearity
±0.07
±0.3 LSB (max)
VOFF
GE
Offset Error
Gain Error
±0.03
±0.08
±0.3
±0.4
LSB (max)
LSB (max)
Total Unadjusted Error
±0.07
±0.3 LSB (max)
DYNAMIC CONVERTER CHARACTERISTICS
SINAD
SNR
THD
SFDR
IMD
Signal-to-Noise Plus Distortion Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Intermodulation Distortion, Second
Order Terms
Intermodulation Distortion, Third
Order Terms
fIN = 100 kHz
fIN = 100 kHz
fIN = 100 kHz
fIN = 100 kHz
fa = 103.5 kHz, fb = 113.5 kHz
fa = 103.5 kHz, fb = 113.5 kHz
49.7
49.7
-77
69
49 dB (min)
dB
-65 dB (max)
65 dB (min)
-68 dB
-68 dB
FPBW -3 dB Full Power Bandwidth
+5V Supply
+3V Supply
11 MHz
8 MHz
POWER SUPPLY CHARACTERISTICS
VDD Supply Voltage
2.7
5.25
V (min)
V (max)
Normal Mode (Static)
VDD = +4.75V to +5.25V,
SCLK On or Off
VDD = +2.7V to +3.6V,
SCLK On or Off
2
1
mA
mA
IDD
Normal Mode (Operational)
Shutdown Mode
Power Consumption, Normal Mode
(Operational)
PD Power Consumption= Shutdown
Mode
ANALOG INPUT CHARACTERISTICS
VDD = +4.75V to +5.25V,
fSAMPLE = 1 MSPS
VDD = +2.7V to +3.6V,
fSAMPLE = 1 MSPS
VDD = +5V, SCLK Off
VDD = +5V, SCLK On
VDD = +5V, fSAMPLE = 1 MSPS
VDD = +3V, fSAMPLE = 1 MSPS
VDD = +5V, SCLK Off
VDD = +3V, SCLK Off
2.0 3.5 mA (max)
0.6 1.6 mA (max)
0.5 µA (max)
60 µA (max)
10
17.5
mW (max)
2 4.8 mW (max)
2.5 µW (max)
1.5 µW (max)
VIN Input Range
IDCL DC Leakage Current
CINA
Analog Input Capacitance
DIGITAL INPUT CHARACTERISTICS
0 to VDD
30
±1
V
µA (max)
pF
VIH
VIL
IIN
CIND
Input High Voltage
Input Low Voltage
Digital Input Current
Input Capacitance
VDD = +5V
VDD = +3V
VIN = 0V or VDD
2.4 V (min)
0.8 V (max)
0.4 V (max)
±10 nA ±1 µA (max)
2 4 pF(max)
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