34830 datasheet(11/22 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34830

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

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).

PTAT Current Generator

MC34830 - Functional Block Diagram

Bias

Signal Path

Bandwidth Adjust

Constant Current Generator

Voltage Bandgap

Bias

Bandwidth Adjust

Signal Path/ Signal Channel

Output Buffer

Level Shifter

Input Clamp

Shutdown

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