Rainbow-electronics MAX108 Manual do Utilizador descarregar pdf (Página 12)

MAX108

±5V, 1.5Gsps, 8-Bit ADC with

On-Chip 2.2GHz Track/Hold Amplifier

12 ______________________________________________________________________________________

_______________Detailed Description

The MAX108 is an 8-bit, 1.5Gsps flash analog-to-digital

converter (ADC) with on-chip T/H amplifier and differ-

ential PECL-compatible outputs. The ADC (Figure 1)

employs a fully differential 8-bit quantizer and a unique

encoding scheme to limit metastable states, with no

error exceeding 1LSB max.

An integrated 8:16 output demultiplexer simplifies inter-

facing to the part by reducing the output data rate to

one-half the sampling clock rate. This demultiplexer

has internal reset capability that allows multiple

MAX108s to be time-interleaved to achieve higher

effective sampling rates.

When clocked at 1.5Gsps, the MAX108 provides a typi-

cal ENOB of 7.5 bits at an analog input frequency of

750MHz. The analog input of the MAX108 is designed

for differential or single-ended use with a ±250mV full-

scale input range. In addition, this fast ADC features an

on-chip +2.5V precision bandgap reference. If desired,

an external reference can also be used.

Figure 1. Simplified Functional Diagram

CLK-

RSTIN+

RSTIN-

VOSADJ

BANDGAP

REFERENCE

+2.5V

CLK+

CLKCOM

VIN-

VIN+

REF

OUT

REF

DEMUXEN

DIVSELECT

DEMUX

CLOCK

DRIVER

50Ω

RSTOUT

A0–A7

P0–P7

DREADY

DIFFERENTIAL

PECL OUTPUTS

T/H

CLOCK

DRIVER

ADC

CLOCK

DRIVER

REFERENCE

AMPLIFIER

DEMUX

CLOCK

GENERATOR

RESET

INPUT DUAL LATCH

RESET

PIPELINE

GNDI

GNDR

DELAYED

RESET

T/H AMPLIFIER

LOGIC

CLOCK

DRIVER

BIAS CURRENTS

OVERRANGE

BIT

AUXILIARY

DATA PORT

PRIMARY

DATA PORT

DATA

READY CLOCK

DEMUX

RESET OUTPUT

8-BIT

FLASH ADC

MAX108

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

±5V, 1.5Gsps, 8-Bit ADC with 1

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