ADC121C021CIMMX/NOPB National Semiconductor, ADC121C021CIMMX/NOPB Datasheet - Page 15

• Manufacturer Part Number: ADC121C021CIMMX/NOPB
• Description: IC ADC 12BIT I2C ALERT 8-MSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of ADC121C021CIMMX/NOPB

• Number Of Bits: 12
• Sampling Rate (per Second): 188.9k
• Data Interface: I²C, Serial
• Number Of Converters: 1
• Power Dissipation (max): 780µW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC121C021CIMMX

1.4 REFERENCE VOLTAGE
The ADC121C021 uses the supply (V
V
version will only be as precise as the reference (V
supply voltage should be free of noise. The reference should
be driven by a low output impedance voltage source.
The Applications section provides recommended ways to
drive the ADC reference input appropriately. Refer to Section
2.1 TYPICAL APPLICATION CIRCUIT
1.5 POWER-ON RESET
An internal power-on reset (POR) occurs when the supply
voltage transitions above the power-on reset threshold. Each
of the registers contains a defined value upon POR and this
data remains there until any of the following occurs:
•
A
must be treated as a reference. The analog-to-digital con-
The first conversion is completed, causing the Conversion
Result and Status registers to be updated.
A
) as the reference, so
for details.
FIGURE 5. Ideal Transfer Characteristic
A
), so the
15
•
•
The internal registers will lose their contents if the supply volt-
age goes below 2.4V. Should this happen, it is important that
the V
supply is raised again to properly reset the device and ensure
that the ADC performs as specified.
1.6 INTERNAL REGISTERS
The ADC121C021 has 8 internal data registers and one ad-
dress pointer. The registers provide additional ADC functions
such as storing minimum and maximum conversion results,
setting alert threshold levels, and storing data to configure the
operation of the device.
their corresponding address pointer values. All of the regis-
ters are read/write capable except the conversion result reg-
ister, which is read-only.
A different data word is written to a writable register.
The ADC is powered down.
A
supply be lowered to a maximum of 200mV before the
Figure 6
30020968
shows all of the registers and
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