fiers (I&Q) reduce this effect significantly, allowing pre-

cise digitizing of fast analog data at high conversion

rates. The input amplifiers buffer the input signal and

allow a full-scale signal input range of ±400mV

Internal Reference

The MAX107 features an integrated, buffered +2.5V

precision bandgap reference. This reference is internal-

ly scaled to match the analog input range specification

of ±400mV. The data converter’s reference output

(REF) can source up to 500µA. REF should be buffered,

if used to supply external devices.

LVDS Digital Outputs

The MAX107 provides data in two’s complement format

to differential LVDS outputs. A simplified circuit

2. All LVDS outputs are powered from separate I-chan-

supplies, which may be operated at +3.3V ±10%. The

MAX107 LVDS-outputs provide a typical ±270mV volt-

age swing around a common mode voltage of roughly

Dual, 6-Bit, 400Msps ADC with On-Chip,

Wideband Input Amplifier

12

______________________________________________________________________________________

Figure 1. MAX105 Flash Converter Architecture

INI-

INI+

2k

Ω

CLK+

CLK-

P0I+/P0I-

DREADY+/DREADY-

DOR+/DOR-

P5I+/P5I-

A0I+/A0I-

A5I+/A5I-

P0Q+/P0Q-

P5Q+/P5Q-

A0Q+/A0Q-

A5Q+/A5Q-

10k

Ω

10k

Ω

CM BUFFER

CM BUFFER

REFERENCE

PRIMARY

DATA PORT

P0I-P5I

AUXILIARY

DATA PORT

A0I-A5I

PRIMARY

DATA PORT

P0Q-P5Q

AUXILIARY

DATA PORT

A0Q-A5Q

I ADC

1:2

REF

MAX107

INQ-

INQ+

2k

Ω

PRE-AMP

Q ADC

REF

REF

DOR

PRE-AMP

MAX107

P0I+ - P5I+

A0I+ - A5I+

P0I- - P5I-

A0I- - A5I-

55

Ω

55

Ω

Figure 2. Simplified LVDS Output Model