March 1997

ML6401

*

8-Bit 20 MSPS A/D Converter

1

GENERAL DESCRIPTION

The ML6401 is a single-chip 8-bit 20 MSPS BiCMOS Video

A/D Converter IC, incorporating a differential input track

and hold, clock generation circuitry, and reference voltage.

The input track and hold consists of a low (4pF)

capacitance input and a fast settling operational amplifier.

The A/D conversion is accomplished through a pipeline

approach, reducing the number of required comparators

and latches. The non-over-lapping clocks required for this

architecture are all internally generated. Clock generation

circuitry requires only one 50% duty cycle clock input.

The use of error correction throughout the A/D converter

improves DNL. All bias voltages and currents required by

the A/D converter are internally generated. The digital

outputs are three-stateable.

FEATURES

s 5.0V

±10% single supply operation

s Internal reference voltage

s Power dissipation less than 200mW typical

s Replaces TMC1175MC20 and AD775JR,

functionally compatible to Sony CXD1175AM/AP

s 16-pin reduced pin count packages

available: ML6401CS-3

s Low input capacitance track and hold: 4pF

s Onboard non-overlapping clock generation to

minimize external components

s Three-state outputs and no missing codes

s 150MHz input track and hold

BLOCK DIAGRAM/TYPICAL APPLICATION

*Some Packages Are End Of Life

DIGITAL

ERROR

CORRECTION

OE

D7

D6

D5

D4

D3

D2

D1

D0

CLK

5V

CLOCK GENERATOR

20MHz

SUB

DAC

AMP

SUB

DAC

AMP

ADC 3

ADC 2

ADC 1

150MHz

T & H

INTERNAL

REFERENCES

1.5V

1.0V

1k

Ω

1k

Ω

75

Ω

VIDEO

INPUT

+

+

10

µF

47

µF

0.1

µF