LSP2961 Datasheet, PDF (3/6 Pages) Agere Systems – Precision Log Ratio Amplifier

Advance Data Sheet
September 2001
Pin Information
LSP2961
Precision Log Ratio Amplifier
IN 1
GND 2
IREF_ADJ
3
VEE
4
8
VOS_ADJ
7
SCALE
FACTOR
6 OUTPUT
5
VCC
Figure 3. External Connections
2311(F)
Table 1. LSP2961 Pin Description
Pin
Number
1
2
3
4
5
6
7
8
Pin Name
IN
GND
IREF_ADJ
VEE
VCC
OUTPUT
SCALE FACTOR
VOS_ADJ
Function
Input
Ground
Sets the Reference Current to
Other than 1 µA
Power Supply
Power Supply
Output Voltage
Sets the Scale Factor to Other
than 1 V/decade
Offset Voltage Adjustment
Pin Total
Counts
Description
1 Input current.
1 Analog ground.
1 Used to set reference current with an
external resistor to GND or VCC.
1 –5 V power supply.
1 5 V power supply.
1 Output voltage.
1 Used to change the scale factor to
other than 1 V/decade (either less than
or greater than) with an external
resistor connecting to the OUTPUT pin
or GND.
1 Used to null offset voltage by
connecting to the wiper of an external
potentiometer between VCC and VEE.
Agere Systems Inc.
3