TLE2141-EP Datasheet, PDF (11/22 Pages) Texas Instruments – Excalibur™ LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIER

FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34830 - Functional Block Diagram
Signal Path/ Signal Channel
Input Clamp
Level Shifter
Output Buffer
Bias
Voltage Bandgap
PTAT Current Generator
Constant Current Generator
Bandwidth Adjust
Shutdown
Signal Path
Bias
Bandwidth Adjust
Shutdown
Figure 22. Functional Internal Block Diagram
SIGNAL PATH/SIGNAL CHANNEL
INPUT CLAMP
This sets the DC level of the signal at the input if the input
is AC-coupled.
LEVELSHIFTER
The Level Shifter provides +250mV DC shift to the input
signal. This positions the signal within the input compliance
of the output buffer.
OUTPUT BUFFER
It provides gain of two as well as the current to drive the
load.
BIAS CIRCUITRY
The Bias Circuitry sets the operating points for the internal
blocks of the 34830. It consists of a bandgap voltage
reference, a PTAT current generator and a constant current
generator.
BANDWIDTH ADJUST
It consists of a variable PTAT current generator whose
current is set by an external resistor. Bias current variation is
inversely proportional to the external resistor value. By
varying the bias current for the level shifter and output buffer
we can adjust the channel bandwidth.
SHUTDOWN
Shutdown enables/disables internal blocks of the 34830
based on the state of the enable input (EN).
Analog Integrated Circuit Device Data
Freescale Semiconductor
34830
11