tc7650 Microchip Technology Inc., tc7650 Datasheet - Page 2

• Manufacturer Part Number: tc7650
• Description: Chopper Stabilized Operational Amplifier
• Manufacturer: Microchip Technology Inc.

TC7650
General Description
The TC7650 CMOS chopper stabilized operational
amplifier practically removes offset voltage error terms
from system error calculations. The 5µV maximum V
specification, for example, represents a 15 times
improvement over the industry standard OP07E. The
50nV/°C offset drift specification is over 25 times lower
than the OP07E. The increased performance elimi-
nates V
adjustment and the reliability problems caused by dam-
aged trimmers.
The TC7650 performance advantages are achieved
without the additional manufacturing complexity and
cost incurred with laser or "zener zap" V
niques.
Functional Block Diagram
DS21463B-page 2
OS
trim procedures, periodic potentiometer
Inputs
Output
Clamp
*
For 8-Pin DIP, connect to V ss
A
B
Output Clamp
NULL
Null
Main
Amplifier
Circuit
Null
Amplifier
OS
B
Compensation
trim tech-
Intermod
OS
The TC7650 nulling scheme corrects both DC V
errors and V
amplifier alternately corrects its own V
main amplifier V
stored on two user supplied external capacitors. The
capacitors connect to the internal amplifier V
points. The main amplifier input signal is never
switched. Switching spikes are not present at the
TC7650 output.
The 14-pin dual-in-line package (DIP) has an external
oscillator input to drive the nulling circuitry for optimum
noise performance. Both the 8 and 14-pin DIPs have
an output voltage clamp circuit to minimize overload
recovery time.
B
Oscillator
A
A
B
OS
drift errors with temperature. A nulling
*C
OS
TC7650
RETN
C
C
14-Pin DIP Only
B
A
error. Offset nulling voltages are
INT/EXT
EXT CLK IN
CLK OUT
©
2002 Microchip Technology Inc.
Output
OS
errors and the
OS
null
OS