ADC12H034CIMSA/NOPB National Semiconductor, ADC12H034CIMSA/NOPB Datasheet - Page 34

• Manufacturer Part Number: ADC12H034CIMSA/NOPB
• Description: ADC 12BIT W/S&H +SIGN 24-SSOP
• Manufacturer: National Semiconductor

Specifications of ADC12H034CIMSA/NOPB

• Number Of Bits: 12
• Data Interface: NSC MICROWIRE™, Serial
• Number Of Converters: 4
• Power Dissipation (max): 33mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Number Of Elements: 1
• Architecture: SAR
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 5V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 500mW
• Differential Linearity Error: ±1LSB
• Integral Nonlinearity Error: ±1LSB
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 24
• Package Type: SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC12H034CIMSA

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3.0 REFERENCE VOLTAGE
The difference in the voltages applied to the V
V
the voltage applied between two multiplexer inputs or the
voltage applied to one of the multiplexer inputs and analog
ground) over which 4095 positive and 4096 negative codes
exist. The voltage sources driving V
very low output impedance and noise. The circuit in is an
example of a very stable reference appropriate for use with
the device.
*Tantalum
The ADC12030/2/4/8 can be used in either ratiometric or ab-
solute reference applications. In ratiometric systems, the ana-
log input voltage is proportional to the voltage used for the
ADC's reference voltage. When this voltage is the system
power supply, the V
connected to ground. This technique relaxes the system ref-
erence stability requirements because the analog input volt-
age and the ADC reference voltage move together. This
maintains the same output code for given input conditions.
For absolute accuracy, where the analog input voltage varies
between very specific voltage limits, a time and temperature
stable voltage source can be connected to the reference in-
puts. Typically, the reference voltage magnitude will require
an initial adjustment to null reference voltage induced full-
scale errors.
Below are recommended references along with some key
specifications.
REF
−
defines the analog input span (the difference between
FIGURE 16. Low Drift Extremely
Stable Reference Circuit
REF
+
pin is connected to V
REF
+
and V
FIGURE 15. Fully Differential Biasing
REF
A
+
and V
−
must have
REF
REF
+
1135442
and
−
is
34
The reference voltage inputs are not fully differential. The
ADC12030/2/4/8 will not generate correct conversions or
comparisons if V
sions result when V
remain at all times between ground and V
mon mode range, (V
V
reference ladder should not go below 0.5V or above 3.0V.
Figure 17 is a graphic representation of the voltage restric-
tions on V
LM4041CI-Adj
LM4040AI-4.1
LM4120AI-4.1
LM4121AI-4.1
LM4050AI-4.1
LM4030AI-4.1
LM4140AC-4.1
Circuit of Figure 16
A
+
) to (0.6 × V
Part Number
REF
+
and V
A
+
REF
). Therefore, with V
REF
+
REF
REF
is taken below V
+
−
and V
+
.
+ V
Tolerance
Adjustable
REF
REF
Voltage
±0.05%
Output
±0.5%
±0.1%
±0.2%
±0.2%
±0.1%
±0.1%
−
−
)/2, is restricted to (0.1 ×
differ by 1V or more and
A
+
REF
= 5V the center of the
1135450
A
−
. Correct conver-
+
. The V
Temperature
Coefficient
±100ppm/°C
±100ppm/°C
±3.0ppm/°C
±50ppm/°C
±50ppm/°C
±50ppm/°C
±10ppm/°C
±2ppm/°C
REF
com-