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ADC081C021 데이터시트 PDF




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부품번호 ADC081C021 기능
기능 (ADC081C021 / ADC081C027) 12-Bit Analog-to-Digital Converter
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ADC081C021 데이터시트, 핀배열, 회로
January 17, 2008
ADC121C021/ADC121C027
I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC)
with Alert Function
General Description
The ADC121C021 is a low-power, monolithic, 12-bit, analog-
to-digital converter(ADC) that operates from a +2.7 to 5.5V
supply. The converter is based on a successive approxima-
tion register architecture with an internal track-and-hold circuit
that can handle input frequencies up to 11MHz. The
ADC121C021 operates from a single supply which also
serves as the reference. The device features an
I2C-compatible serial interface that operates in all three speed
modes, including high speed mode (3.4MHz).
The ADC's Alert feature provides an interrupt that is activated
when the analog input violates a programmable upper or low-
er limit value. The device features an automatic conversion
mode, which frees up the controller and I2C interface. In this
mode, the ADC continuously monitors the analog input for an
"out-of-range" condition and provides an interrupt if the mea-
sured voltage goes out-of-range.
The ADC121C021 comes in a small TSOT-6 package with an
alert output. The ADC121C027 comes in a small TSOT-6
package with an address selection input. The ADC121C027
provides three pin-selectable addresses. Pin-compatible al-
ternatives are available with additional address options.
Normal power consumption using a +3V or +5V supply is
0.26mW or 0.78mW, respectively. The automatic power-
down feature reduces the power consumption to less than
1µW while not converting. Operation over the industrial tem-
perature range of −40°C to +105°C is guaranteed. Their low
power consumption and small packages make this family of
ADCs an excellent choice for use in battery operated equip-
ment.
The ADC121C021 and ADC121C027 are part of a family of
pin-compatible ADCs that also provide 8 and 10 bit resolution.
For 8-bit ADCs see the ADC081C021 and ADC081C027. For
10-bit ADCs see the ADC101C021 and ADC101C027.
Features
I2C-Compatible 2-wire Interface which supports standard
(100kHz), fast (400kHz), and high speed (3.4MHz) modes
Extended power supply range (+2.7V to +5.5V)
Up to four pin-selectable chip addresses
Out-of-range Alert Function
Automatic Power-down mode while not converting
Very small 6-pin TSOT packages
±8kV HBM ESD protection (SDA, SCL)
Key Specifications
Resolution
12 bits; no missing codes
Conversion Time
1µs (typ)
INL & DNL
±1 LSB (max) (up to 22kSPS)
Throughput Rate
188.9kSPS (max)
Power Consumption (at 22kSPS)
3V Supply
0.26 mW (typ)
5V Supply
0.78 mW (typ)
Applications
System Monitoring
Peak Detection
Portable Instruments
Medical Instruments
Test Equipment
Pin-Compatible Alternatives
All devices are fully pin and function compatible.
Resolution ALERT Output
ADDR Input
12-bit
ADC121C021
ADC121C027
10-bit
ADC101C021
ADC101C027
8-bit
ADC081C021
ADC081C027
Connection Diagrams
30020901
I2C® is a registered trademark of Phillips Corporation.
© 2008 National Semiconductor Corporation
300209
30020902
www.national.com
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ADC081C021 pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, VA
Voltage on any Analog Input Pin to
GND
Voltage on any Digital Input Pin to
GND
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Power Dissipation at TA = 25°C
ESD Susceptibility (Note 5)
VA, GND, VIN, ALERT,
ADDR pins:
Human Body Model
Machine Model
Charged Device Model (CDM)
SDA, SCL pins:
Human Body Model
Machine Model
Junction Temperature
Storage Temperature
-0.3V to +6.5V
−0.3V to (VA +0.3V)
−0.3V to 6.5V
±15 mA
±20 mA
See (Note 4)
2500V
250V
1250V
8000V
400V
+150°C
−65°C to +150°C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
Supply Voltage, VA
Analog Input Voltage, VIN
Digital Input Voltage (Note 7)
Sample Rate
−40°C TA +105°C
+2.7V to 5.5V
0V to VA
0V to 5.5V
up to 188.9 kSPS
Package Thermal Resistances
Package
θJA
6-Lead TSOT
250°C/W
Soldering process must comply with National
Semiconductor's Reflow Temperature Profile specifications.
Refer to www.national.com/packaging. (Note 6)
Electrical Characteristics
The following specifications apply for VA = +2.7V to +5.5V, GND = 0V, fSCL up to 3.4MHz, fIN = 1kHz for fSCL up to 400kHz,
fIN = 10kHz for fSCL = 3.4MHz unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25°C
unless otherwise noted.
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9) Units (Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
12 Bits
VA = +2.7V to +3.6V
INL Integral Non-Linearity (End Point fSCL up to 400kHz (Note 13)
Method)
VA = +2.7V to +5.5V. fSCL up to 3.4MHz
±0.5
+1.2
−0.9
±1 LSB (max)
LSB
LSB
DNL Differential Non-Linearity
VA = +2.7V to +3.6V
fSCL up to 400kHz (Note 13)
VA = +2.7V to +5.5V. fSCL up to 3.4MHz
+0.5
−0.5
+1.3
−0.9
+1
−0.9
LSB (max)
LSB (min)
LSB
LSB
VOFF Offset Error
GE Gain Error
VA = +2.7V to +3.6V
fSCL up to 400kHz (Note 13)
VA = +2.7V to +5.5V. fSCL up to 3.4MHz
+0.1
+1.4
-0.8
±1.6
±6
LSB (max)
LSB
LSB (max)
DYNAMIC CONVERTER CHARACTERISTICS
ENOB
SNR
THD
SINAD
Effective Number of Bits
VA = +2.7V to +3.6V
VA = +3.6V to +5.5V
Signal-to-Noise Ratio
VA = +2.7V to +3.6V
VA = +3.6V to +5.5V
Total Harmonic Distortion
VA = +2.7V to +3.6V
VA = +3.6V to +5.5V
Signal-to-Noise Plus Distortion Ratio VA = +2.7V to +3.6V
VA = +3.6V to +5.5V
11.7
11.5
72.5
71
−92
−87
72.6
71
11.3
70.4
−78
70
Bits (min)
Bits (min)
dB (min)
dB (min)
dB (max)
dB (max)
dB (min)
dB (min)
www.national.com
4
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ADC081C021 전자부품, 판매, 대치품
A.C. and Timing Characteristics
The following specifications apply for VA = +2.7V to +5.5V. Boldface limits apply for TMIN TA TMAX and all other limits are at
TA = 25°C, unless otherwise specified.
Symbol
Parameter
Conditions (Note 12)
Typical
(Note 9)
Limits
(Notes 9,
12)
Units
(Limits)
CONVERSION RATE
Conversion Time
1 µs
fCONV
Conversion Rate
DIGITAL TIMING SPECS (SCL, SDA)
fSCL = 100kHz
fSCL = 400kHz
fSCL = 1.7MHz
fSCL = 3.4MHz
5.56
22.2
94.4
188.9
kSPS
kSPS
kSPS
kSPS
fSCL Serial Clock Frequency
tLOW
SCL Low Time
tHIGH
SCL High Time
tSU;DAT Data Setup Time
Standard Mode
Fast Mode
High Speed Mode, Cb = 100pF
High Speed Mode, Cb = 400pF
Standard Mode
Fast Mode
High Speed Mode, Cb = 100pF
High Speed Mode, Cb = 400pF
Standard Mode
Fast Mode
High Speed Mode, Cb = 100pF
High Speed Mode, Cb = 400pF
Standard Mode
Fast Mode
High Speed Mode
100 kHz (max)
400 kHz (max)
3.4 MHz (max)
1.7 MHz (max)
4.7 us (min)
1.3 us (min)
160 ns (min)
320 ns (min)
4.0 us (min)
0.6 us (min)
60 ns (min)
120 ns (min)
250 ns (min)
100 ns (min)
10 ns (min)
Standard Mode (Note 14)
0 us (min)
3.45 us (max)
tHD;DAT Data Hold Time
Fast Mode (Note 14)
High Speed Mode, Cb = 100pF
0 us (min)
0.9 us (max)
0 ns (min)
70 ns (max)
High Speed Mode, Cb = 400pF
0 ns (min)
150 ns (max)
tSU;STA
Setup time for a start or a repeated
start condition
Standard Mode
Fast Mode
High Speed Mode
4.7 us (min)
0.6 us (min)
160 ns (min)
tHD;STA
Hold time for a start or a repeated start
condition
Standard Mode
Fast Mode
High Speed Mode
4.0 us (min)
0.6 us (min)
160 ns (min)
tBUF
Bus free time between a stop and start Standard Mode
condition
Fast Mode
4.7 us (min)
1.3 us (min)
tSU;STO Setup time for a stop condition
Standard Mode
Fast Mode
High Speed Mode
4.0 us (min)
0.6 us (min)
160 ns (min)
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