Datasheet

MAX873/MAX875/MAX876
Low-Power, Low-Drift, +2.5V/+5V/+10V
Precision Voltage References
10 ______________________________________________________________________________________
Temp Output
The MAX873/MAX875/MAX876 provide a temperature
output proportional to die temperature. TEMP can be cal-
culated from the following formula:
TEMP (V) = T
J
(°K) x n
where T
J
= the die temperature,
n = the temperature multiplier,
T
A
= the ambient temperature.
Self-heating affects the die temperature and conversely,
the TEMP output. The TEMP equation assumes the output
is not loaded. If device power dissipation is negligible,
then T
J
≈ T
A
.
Applications Information
Bypassing/Output Capacitance
For the best line-transient performance, decouple the
input with a 0.1µF ceramic capacitor as shown in the
Typical Operating Circuit . Place the capacitor as close
to IN as possible. When transient performance is less
important, no capacitor is necessary.
The MAX873/MAX875/MAX876 do not require an output
capacitor for stability and are stable with capacitive
loads up to 100µF. In applications where the load or the
supply can experience step changes, a larger output
capacitor reduces the amount of overshoot (under-
shoot) and improves the circuit’s transient response.
Place output capacitors as close to the devices as pos-
sible for best performance.
Supply Current
The MAX873/MAX875/MAX876 consume 320µA (typ) of
quiescent supply current. This improved efficiency
reduces power dissipation and extends battery life.
Thermal Hysteresis
Thermal hysteresis is the change in the output voltage
at T
A
= +25°C before and after the device is cycled
over its entire operating temperature range. Hysteresis
is caused by differential package stress appearing
across the bandgap core transistors. The typical ther-
mal hysteresis value is 120ppm.
Turn-On Time
The MAX873/MAX875/MAX876 typically turn on and settle
to within 0.1% of the preset output voltage in 150µs
(2.5V output). The turn-on time can increase up to
150µs with the device operating with a 1µF load.
Short-Circuited Outputs
The MAX873/MAX875/MAX876 feature a short-circuit-pro-
tected output. Internal circuitry limits the output current
to 60mA when short circuiting the output to ground.
The output current is limited to 3mA when short circuit-
ing the output to the input.
n
VatTT
T
mV K
TEMP J
( )
./=
=
≅ °
0
0
19
TEMPERATURE
COEFFICIENT
(ppm/°C)
110
100
16-BIT
14-BIT
12-BIT
10-BIT
8-BIT
0.01
0.1
10
100
1000
1
10,000
18-BIT
20-BIT
OPERATING TEMPERATURE RANGE (T
MAX
- T
MIN
) (°C)
Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error