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ADC081C021 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC081C021
Beschreibung (ADC081C021 / ADC081C027) 12-Bit Analog-to-Digital Converter
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 30 Seiten
ADC081C021 Datasheet, Funktion
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
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ADC081C021 Datasheet, Funktion
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9)
POWER REQUIREMENTS
Supply Voltage Minimum
VA Supply Voltage Maximum
2.7
5.5
Continuous Operation Mode -- 2-wire interface active.
IN Supply Current
fSCL=400kHz
fSCL=3.4MHz
VA = 2.7V to 3.6V
VA = 4.5V to 5.5V
VA = 2.7V to 3.6V
VA = 4.5V to 5.5V
0.08
0.16
0.37
0.74
0.14
0.30
0.55
0.99
PN Power Consumption
fSCL=400kHz
fSCL=3.4MHz
VA = 3.0V
VA = 5.0V
VA = 3.0V
VA = 5.0V
0.26
0.78
1.22
3.67
Automatic Conversion Mode -- 2-wire interface stopped and quiet (SCL = SDA = VA). fSAMPLE = TCONVERT * 32
IA Supply Current
VA = 2.7V to 3.6V
VA = 4.5V to 5.5V
0.41
0.78
0.59
1.2
PA Power Consumption
VA = 3.0V
VA = 5.0V
1.35
3.91
Power Down Mode (PD1) -- 2-wire interface stopped and quiet. (SCL = SDA = VA).(Note 10)
IPD1 Supply Current
0.1 0.2
PPD1 Power Consumption
0.5 0.9
Power Down Mode (PD2) -- 2-wire interface active. Master communicating with a different device on the bus.
IPD2 Supply Current
fSCL=400kHz
fSCL=3.4MHz
VA = 2.7V to 3.6V
VA = 4.5V to 5.5V
VA = 2.7V to 3.6V
VA = 4.5V to 5.5V
13
27
89
168
45
80
150
250
PPD2 Power Consumption
fSCL=400kHz
fSCL=3.4MHz
VA = 3.0V
VA = 5.0V
VA = 3.0V
VA = 5.0V
0.04
0.14
0.29
0.84
Units (Limits)
V (min)
V (max)
mA (max)
mA (max)
mA (max)
mA (max)
mW
mW
mW
mW
mA (max)
mA (max)
mW
mW
µA (max)
µW (max)
µA (max)
µA (max)
µA (max)
µA (max)
mW
mW
mW
mW
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6 Page









ADC081C021 pdf, datenblatt
ENOB vs. Supply
SINAD vs. Supply
FFT Plot
30020928
FFT Plot
30020929
30020930
Offset Error vs. Temperature
30020931
Gain Error vs. Temperature
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30020932
12
30020933
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