ADC122S051CIMM/NOPB National Semiconductor, ADC122S051CIMM/NOPB Datasheet - Page 17

• Manufacturer Part Number: ADC122S051CIMM/NOPB
• Description: IC ADC 12BIT 2CHAN 500KSPS 8MSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of ADC122S051CIMM/NOPB

• Number Of Bits: 12
• Sampling Rate (per Second): 500k
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 10mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Number Of Elements: 1
• Resolution: 12Bit
• Architecture: SAR
• Sample Rate: 500KSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 5.25V
• Differential Input: No
• Power Supply Requirement: Single
• Single Supply Voltage (typ): 3.3/5V
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Differential Linearity Error: -1LSB/1.3LSB
• Integral Nonlinearity Error: ±1.1LSB
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: MSOP
• Input Signal Type: Single-Ended
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC122S051CIMM; ADC122S051CIMMTR

3.0 ADC122S051 TRANSFER FUNCTION
The output format of the ADC122S051 is straight binary.
Code transitions occur midway between successive integer
LSB values. The LSB width for the ADC122S051 is V
4.0 TYPICAL APPLICATION CIRCUIT
A typical application of the ADC122S051 is shown in
Figure 4. Power is provided, in this example, by the National
Semiconductor LP2950 low-dropout voltage regulator, avail-
able in a variety of fixed and adjustable output voltages. The
power supply pin is bypassed with a capacitor network locat-
ed close to the ADC122S051. Because the reference for the
ADC122S051 is the supply voltage, any noise on the supply
FIGURE 3. Ideal Transfer Characteristic
FIGURE 4. Typical Application Circuit
A
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The ideal transfer characteristic is shown in Figure 3. The
transition from an output code of 0000 0000 0000 to a code
of 0000 0000 0001 is at 1/2 LSB, or a voltage of V
Other code transitions occur at steps of one LSB.
will degrade device noise performance. To keep noise off the
supply, use a dedicated linear regulator for this device, or
provide sufficient decoupling from other circuitry to keep noise
off
ADC122S051's low power requirements, it is also possible to
use a precision reference as a power supply to maximize per-
formance. The four-wire interface is shown connected to a
microprocessor or DSP.
the
ADC122S051
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