MAX913CSA(2003) データシートの表示（PDF） - Maxim Integrated

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MAX913CSA
(Rev.:2003)

Single/Dual, Ultra-Fast, Low-Power Precision TTL Comparators

Maxim Integrated 

Single/Dual, Ultra-Fast, Low-Power

Precision TTL Comparators

Applications Information

Power Supplies and Bypassing

The MAX912/MAX913 are tested with ±5V power sup-

plies that provide an input common-mode range (VCM)

of 8.7V (-5.2V to +3.5V). Operation from a single +5V

supply provides a common-mode input range of 3.7V

(-0.2V to +3.5). Connect V- to GND for single-supply

operation. The MAX912/MAX913 will operate from a

minimum single-supply voltage of +4.5V.

The V+ supply provides power to both the analog input

stage and digital output circuits, whereas the V- supply

only powers the analog section. Bypass V+ and V- to

ground with 0.1µF to 1.0µF ceramic capacitors in parallel

with 10µF or greater tantalum capacitors. Connect the

ceramic capacitors very close to the MAX912/MAX913’s

supply pins, keeping leads short to minimize lead induc-

tance. For particularly noisy applications, use ferrite

beads on the power-supply lines.

Board Layout

As with all high-speed components, careful attention to

layout is essential for best performance.

1) Use a printed circuit board with an unbroken ground

plane.

2) Pay close attention to the bandwidth of bypass com-

ponents and keep leads short.

3) Avoid sockets; solder the comparator and other

components directly to the board to minimize

unwanted parasitic inductance and capacitance.

Input Slew Rate

The MAX912/MAX913 design eliminates the input slew-

rate requirement imposed on many standard compara-

tors. As long as LE is high after the maximum propaga-

tion delay and the input is greater than the

comparator’s total DC error, the output will be valid

without oscillations.

Maximum Clock (LE) and Signal Rate

The maximum clock and signal rate is 70MHz, based

on the comparator’s rise and fall time with a 5mV over-

drive at +25°C (Figure 1). With a 20mV overdrive, the

maximum propagation delay is 12ns and the clock sig-

nal rate is 85MHz.

IN+

IN-

HYSTERESIS

BAND*

Q

WITH HYSTERESIS

IDEAL (WITHOUT HYSTERESIS)

*WHEN HYSTERESIS IS ADDED, A COMPARATOR CANNOT RESOLVE ANY INPUT SIGNAL WITHIN THE HYSTERESIS BAND.

Figure 2. Effect of Hysteresis on Input Resolution

Chip Information

MAX912 TRANSISTOR COUNT: 285

MAX913 TRANSISTOR COUNT: 154

PROCESS: Bipolar

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