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PDF ADC121S705 Data sheet ( Hoja de datos )
| Número de pieza | ADC121S705 | |
| Descripción | Micro Power A/D Converter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 2006
ADC121S705
12-Bit, 500 kSPS to 1 MSPS, Differential Input, Micro Power
A/D Converter
General Description
The ADC121S705 is a 12-bit, 500 kSPS to 1 MSPS sampling
Analog-to-Digital (A/D) converter that features a fully differ-
ential, high impedance analog input and an external refer-
ence. The reference voltage can be varied from 1.0V to VA,
with a corresponding resolution between 244µV and VA di-
vided by 4096.
The output serial data is binary 2's complement and is com-
patible with several standards, such as SPI™, QSPI™, MI-
CROWIRE™, and many common DSP serial interfaces. The
differential input, low power consumption, and small size
make the ADC121S705 ideal for direct connection to trans-
ducers in battery operated systems or remote data acquisition
applications.
Operating from a single 5V supply, the supply current when
operating at 1 MSPS is typically 2.3 mA. The supply current
drops down to 0.3 µA typically when the ADC121S705 enters
power-down mode. The ADC121S705 is available in the
MSOP-8 package. Operation is guaranteed over the indus-
trial temperature range of −40°C to +105°C and clock rates
of 8 MHz to 16 MHz.
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Features
■ True Differential Inputs
■ Guaranteed performance from 500 kSPS to 1 MSPS
■ External Reference
■ Wide Input Common-Mode Voltage Range
■ SPI™/QSPI™/MICROWIRE™/DSP compatible Serial
Interface
Key Specifications
■ Conversion Rate
■ INL
■ DNL
■ Offset Error
■ Gain Error
■ SINAD
■ Power Consumption at VA = 5V
■ — Active, 1 MSPS
— Active, 500 kSPS
— Power-Down
500 kSPS to 1 MSPS
± 0.95 LSB (max)
± 0.95 LSB (max)
± 3.0 LSB (max)
± 6.5 LSB (max)
69.5 dB (min)
11.5 mW (typ)
9.0 mW (typ)
1.5 µW (typ)
Applications
■ Automotive Navigation
■ Portable Systems
■ Medical Instruments
■ Instrumentation and Control Systems
■ Motor Control
■ Direct Sensor Interface
Connection Diagram
20186705
Ordering Information
Order Code
ADC121S705CIMM
ADC121S705CIMMX
ADC121S705EB
Temperature Range
−40°C to +105°C
−40°C to +105°C
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2007 National Semiconductor Corporation 201867
Description
8-Lead MSOP Package, 1000 Units Tape & Reel
8-Lead MSOP Package, 3500 Units Tape & Reel
Evaluation Board
Top Mark
X1AC
X1AC
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1 page  
ADC121S705 Timing Specifications (Note 8)
The following specifications apply for VA = +4.5V to 5.5V, VREF = 2.5V, fSCLK = 8 MHz to 16 MHz, CL = 25 pF, Boldface limits
apply for TA = TMIN to TMAX: all other limits TA = 25°C.
Symbol
Parameter
Conditions
Typical Limits
Units
tCSH
tCSSU
tDH
tDA
tDIS
CS Hold Time after an SCLK rising edge
CS Setup Time prior to an SCLK rising edge
DOUT Hold time after an SCLK Falling edge
DOUT Access time after an SCLK Falling edge
DOUT Disable Time after the rising edge of CS
(Note 10)
5 ns (min)
5 ns (min)
7 2.5 ns (min)
18 22 ns (max)
20 ns (max)
tEN DOUT Enable Time after the falling edge of CS
tCH SCLK High Time
tCL SCLK Low Time
tr DOUT Rise Time
tf DOUT Fall Time
8 20 ns (max)
25 ns (min)
25 ns (min)
7 ns
7 ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions. Operation of the device beyond the maximum Operating Ratings is not recommended.
Note 2: All voltages are measured with respect to GND = 0V, unless otherwise specified.
Note 3: When the input voltage at any pin exceeds the power supplies (that is, VIN < GND or VIN > VA), the current at that pin should be limited to 10 mA. The 50
mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 10 mA to five.
Note 4: The absolute maximum junction temperature (TJmax) for this device is 150°C. The maximum allowable power dissipation is dictated by TJmax, the
junction-to-ambient thermal resistance (θJA), and the ambient temperature (TA), and can be calculated using the formula PDMAX = (TJmax − TA)/θJA. The values
for maximum power dissipation listed above will be reached only when the ADC121S705 is operated in a severe fault condition (e.g. when input or output pins
are driven beyond the power supply voltages, or the power supply polarity is reversed). Such conditions should always be avoided.
Note 5: Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor. Machine model is a 220 pF capacitor discharged through 0 Ω. Charge
device model simulates a pin slowly acquiring charge (such as from a device sliding down the feeder in an automated assembler) then rapidly being discharged.
Note 6: Reflow temperature profiles are different for lead-free packages.
Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 8: Data sheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: While the maximum sample rate is fSCLK/16, the actual sample rate may be lower than this by having the CS rate slower than fSCLK/16.
Note 10: tDIS is the time for DOUT to change 10% while being loaded by the Timing Test Circuit.
Timing Diagrams
FIGURE 1. ADC121S705 Single Conversion Timing Diagram
20186701
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5 Page 
Typical Performance Characteristics VA = 5.0V, VREF = 2.5V, TA = +25°C, fSAMPLE = 1 MSPS, fSCLK =
16 MHz, fIN = 100 kHz unless otherwise stated.
DNL vs. TEMPERATURE
INL vs. TEMPERATURE
20186729
OFFSET ERROR vs. TEMPERATURE
20186730
GAIN ERROR vs. TEMPERATURE
SNR vs. VA
20186757
THD vs. VA
20186759
20186731
11
20186732
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| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ADC121S705.PDF ] | |
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