MAX9315 Просмотр технического описания (PDF) - Maxim Integrated

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MAX9315

1:5 Differential LVPECL/LVECL/HSTL Clock and Data Driver

Maxim Integrated 

1:5 Differential LVPECL/LVECL/HSTL

Clock and Data Driver

VEE connected to ground, the outputs are LVPECL. The

outputs are LVECL when VCC is connected to ground

and VEE is connected to a negative supply.

Input Bias Resistors

When the inputs are open, the internal bias resistors set

the inputs to low state. The inverting inputs (CLK0 and

CLK1) are each biased with a 75kΩ pullup to VCC and a

75kΩ pulldown to VEE. The noninverting inputs (CLK0

and CLK1) are each biased with a 75kΩ pulldown to VEE.

Differential Clock Input Limits

The maximum magnitude of the differential signal

applied to the clock input is 3.0V or VCC - VEE, whichev-

er is less. This limit also applies to the difference

between any reference voltage input and a single-ended

input. Specifications for the high and low voltages of a

differential input (VIHD and VILD) and the differential input

voltage (VIHD - VILD) apply simultaneously.

Single-Ended Clock Input and VBB

The differential clock inputs can be configured to

accept single-ended inputs. This is accomplished by

connecting the on-chip reference voltage, VBB, to the

inverting or noninverting input of a differential input as a

reference. For example, the differential CLK0, CLK0

input is converted to a noninverting, single-ended input

by connecting VBB to CLK0 and connecting the single-

ended input signal to CLK0. Similarly, an inverting con-

figuration is obtained by connecting VBB to CLK0 and

connecting the single-ended input to CLK0. With a dif-

ferential input configured as single ended (using VBB),

the single-ended input can be driven to VCC and VEE or

with a single-ended LVPECL/LVECL signal. Note that

single-ended input must be at least VBB ±100mV or a

differential input of at least 100mV to switch the outputs

to the VOH and VOL levels specified in the DC Electrical

Characteristics table.

If VBB is used, the supply must be in the VCC - VEE =

+2.725V to +3.8V range because one of the inputs

must be VEE + 1.2V or higher for proper input stage

operation. VBB must be at least VEE + 1.2V because it

becomes the high-level input when the other (single-

ended) input swings below it. Therefore, minimum VBB

= VEE + 1.2V. The minimum VBB output of the

MAX9315 is VCC - 1.525V. Substituting the minimum

VBB output into VBB = VEE + 1.2V results in a minimum

supply of +2.725V. Rounding up to standard supplies

gives the single-ended operating supply range of VCC -

VEE = +3.0V to +3.8V.

When using the VBB reference output, bypass it with a

0.01µF ceramic capacitor to VCC. If the VBB reference

is not used, leave it open. The VBB reference can

source or sink 0.5mA, which is sufficient to drive two

inputs. Use VBB only for inputs that are on the same

device as the VBB reference.

Applications Information

Supply Bypassing

Bypass VCC to VEE with high-frequency surface-mount

ceramic 0.1µF and 0.01µF capacitors in parallel as

close to the device as possible, with the 0.01µF capaci-

tor closest to the device. Use multiple parallel vias to

minimize parasitic inductance. When using the VBB ref-

erence output, bypass it with a 0.01µF ceramic capaci-

tor to VCC (if the VBB reference is not used, it can be

left open).

Controlled-Impedance Traces

Input and output trace characteristics affect the perfor-

mance of the MAX9315. Connect high-frequency input

and output signals with 50Ω characteristic impedance

traces. Minimize the number of vias to prevent imped-

ance discontinuities. Reduce reflections by maintaining

the 50Ω characteristic impedance through cables and

connectors. Reduce skew within a differential pair by

matching the electrical length of the traces.

Output Termination

Terminate outputs with 50Ω to VCC - 2V or use an

equivalent Thevenin termination. When a single-ended

signal is taken from a differential output, terminate both

outputs. For example, if Q0 is used as a single-ended

output, terminate both Q0 and Q0.

Chip Information

TRANSISTOR COUNT: 616

PROCESS: Bipolar

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