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PDF ADC121C027 Data sheet ( Hoja de datos )
| Número de pieza | ADC121C027 | |
| Descripción | 12-Bit Analog-to-Digital Converter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
1 page  
Symbol
Parameter
Conditions
SFDR Spurious-Free Dynamic Range
Intermodulation Distortion, Second
Order Terms (IMD2)
IMD
Intermodulation Distortion, Third
Order Terms (IMD3)
FPBW Full Power Bandwidth (−3dB)
ANALOG INPUT CHARACTERISTICS
VA = +2.7V to +3.6V
VA = +3.6V to +5.5V
VA = +3.0V,
fa = 1.035 kHz, fb = 1.135 kHz
VA = +5.0V,
fa = 1.035 kHz, fb = 1.135 kHz
VA = +3.0V,
fa = 1.035 kHz, fb = 1.135 kHz
VA = +5.0V,
fa = 1.035 kHz, fb = 1.135 kHz
VA = +3.0V
VA = +5.0V
VIN
IDCL
CINA
Input Range
DC Leakage Current (Note 10)
Input Capacitance
Track Mode
Hold Mode
SERIAL INTERFACE INPUT CHARACTERISTICS (SCL, SDA)
VIH Input High Voltage
VIL Input Low Voltage
IIN Input Current (Note 10)
CIN Input Pin Capacitance
VHYST Input Hysteresis
ADDRESS SELECTION INPUT CHARACTERISTICS (ADDR)
VIH Input High Voltage
VIL Input Low Voltage
IIN Input Current (Note 10)
LOGIC OUTPUT CHARACTERISTICS, OPEN-DRAIN (SDA, ALERT)
VOL Output Low Voltage
IOZ
High-Impedence Output
Leakage Current (Note 10)
ISINK = 3 mA
ISINK = 6 mA
Output Coding
Typical
(Note 9)
90
87
−89
Limits
(Note 9)
76
Units (Limits)
dB (min)
dB (min)
dB
−91 dB
−88 dB
−88 dB
8 MHz
11 MHz
0 to VA
30
3
±1
V
µA (max)
pF
pF
0.7 x VA
0.3 x VA
±1
V (min)
V (max)
µA (max)
3 pF
0.1 x VA
V (min)
VA - 0.5V
0.5
±1
V (min)
V (max)
µA (max)
0.4 V (max)
0.6 V (max)
±1 µA (max)
Straight (Natural) Binary
5 www.national.com
5 Page 
Typical Performance Characteristics fSCL = 400kHz, fSAMPLE = 22kSPS, fIN = 1kHz, VA = 5.0V, TA =
+25°C, unless otherwise stated.
INL vs. Code - VA=3V
DNL vs. Code - VA=3V
INL vs. Code - VA=5V
30020922
DNL vs. Code - VA=5V
30020923
INL vs. Supply
30020924
DNL vs. Supply
30020925
30020926
11
30020927
www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADC121C027.PDF ] | |
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