MAX6133 Maxim Integrated Products, MAX6133 Datasheet - Page 11

• Manufacturer Part Number: MAX6133
• Description: Low-Dropout Voltage Reference
• Manufacturer: Maxim Integrated Products

As shown in Figure 2, the MAX6133 can be used to
develop a negative voltage reference using the
MAX400, a rail-to-rail op-amp with low power, low
noise, and low offset. The circuit only provides a good
negative reference and is ideal for space- and cost-
sensitive applications since it does not use resistors.
Figure 2. Negative Low-Power Voltage Reference
Figure 3. Temperature Coefficient vs. Operating Temperature Range for a 1LSB Maximum Error
0.1 F
0.1 F
Negative Low-Power Voltage Reference
TEMPERATURE
COEFFICIENT
(ppm/ C)
MAX400
V+
V-
10,000
1000
______________________________________________________________________________________
0.01
100
0.1
10
0.1 F
1
1
OUT
POSITIVE SUPPLY
3ppm/°C, Low-Power, Low-Dropout
MAX6133
GND
IN
-V
OPERATING TEMPERATURE RANGE (T
OUT
0.1 F
10
In a data converter application, the converter’s refer-
ence voltage must stay within a certain limit to keep the
error in the data converter smaller than the resolution
limit through the operating temperature range. Figure 3
shows the maximum allowable reference-voltage tem-
perature coefficient that keeps the conversion error to
less than 1LSB. This is a function of the operating tem-
perature range (T
tion as a parameter. The graph assumes the
reference-voltage temperature coefficient as the only
parameter affecting accuracy. In reality, the absolute
static accuracy of a data converter is dependent on the
combination of many parameters such as integral non-
linearity, differential nonlinearity, offset error, gain error,
as well as voltage reference changes.
TRANSISTOR COUNT: 656
PROCESS: BiCMOS
MAX
- T
MIN
) ( C)
Voltage Reference
Operating Temperature Range
MAX
Temperature Coefficient vs.
for a 1LSB Maximum Error
- T
MIN
Chip Information
) with the converter resolu-
100
10 BIT
12 BIT
14 BIT
16 BIT
18 BIT
20 BIT
8 BIT
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