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ISL21400
Data Sheet
March 31, 2011
FN8091.3
Programmable Temperature Slope
Voltage Reference
The ISL21400 features a precision voltage reference
combined with a temperature sensor whose output voltage
varies linearly with temperature. The precision 1.20V
reference has a very low temperature coefficient (tempco),
and its output voltage is scaled by an internal DAC (V REF ) to
produce a temperature stable output voltage that is
programmable from 0V to 1.20V. The output voltage from the
temperature sensor (V TS ) is summed with V REF to produce
a temperature dependent output voltage.
The slope of the V TS portion of the output voltage can be
programmed to be positive or negative in the range
-2.1mV/°C to +2.1mV/°C. A programmable gain amplifier
(PGA) sums the V TS and the V REF voltages and provides
gains of 1x, 2x, and 4x to scale the output up to 4.8V and the
slope to ±8.4mV/°C.
The V REF and V TS terms are programmable with 8 bits of
resolution via an I 2 C bus and the values are stored in
non-volatile registers. The PGA gain is also set via the I 2 C
bus and the value is stored in a non-volatile register.
Non-volatile memory storage assures the programmed
settings are retained on power-down, eliminating the need
for software initialization at device power-up.
Temperature Characteristics Curve
Features
? Programmable reference voltage
? Programmable temperature slope
? Programmable Gain Amplifier
? Non-volatile storage of programming registers
? I 2 C serial interface
? 2% total accuracy over temperature and V CC range
? 200μA typical active supply current
? Operating temperature range = -40°C to +85°C
? 8 Ld MSOP package
? Pb-free (RoHS compliant)
Applications
? RF power amplifier bias compensation
? LCD bias compensation
? Laser diode bias compensation
? Sensor bias and linearization
? Data acquisition systems
? Variable DAC reference
? Amplifier biasing
3.0
2.5
A V = 2
Pinout
ISL21400
2.0
TS = 0
TS = 127
TS = 255
(8 LD MSOP)
TOP VIEW
1.5
1.0
A V = 1
A2
1
8
V CC
0.5
TS = 0
TS = 127
TS = 255
A1
A0
2
3
7
6
V OUT
SDA
0.0
-40
-15
10
35
60
85
V SS
4
5
SCL
TEMPERATURE (°C)
Pin Descriptions
MSOP
1
2
3
4
5
6
7
8
SYMBOL
A2
A1
A0
V SS
SCL
SDA
VOUT
V CC
DESCRIPTION
Hardwire slave address pin for I 2 C serial bus
Hardwire slave address pin for I 2 C serial bus
Hardwire slave address pin for I 2 C serial bus
Ground pin
Serial bus clock input
Serial bus data input/output
Output voltage
Device power supply
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2006-2008, 2011. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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