LG1605DXB datasheet(2/12 Pages) AGERE

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Data Sheet

LG1605DXB Limiting Amplifier

February 1999

Lucent Technologies Inc.

Functional Description (continued)

The amplifier has a virtually constant output delay for

input signal levels, varying across three decades. As a

result, the device has very low amplitude-to-phase con-

version, which makes it ultimately suitable for applica-

tions in highly sensitive fiber-optic systems. Although

the amplifier is most sensitive when the input is ac cou-

pled (see Figure 3), a low offset (<25 mV) and a large

common-mode input range of 2 V make it useful in

applications that require a high-speed comparator as

well.

A unique input coupling arrangement allows for a fre-

quency response down into the low kHz range while

using coupling capacitors that are small enough to

maintain a good input return loss at high frequencies.

The outputs, when ac coupled, provide a good RF ter-

mination up to very high frequencies. The associated

ability to absorb reflections returning from the receiving

end is essential for preventing intersymbol interference

in fiber-optic systems.

The amplifier is a natural step-up interface between

receivers, such as the Lucent Technologies Micro-

eletronics Group Optoelectronics unit 1319 and regen-

erators like the Lucent Technologies Microelectronics

Group LG1600. The referred wideband input noise

(168 µVrms typical) allows for a <1e–9 bit error rate

(BER) for inputs down to 2 mVp-p (S/N ratio of

21.5 dB).

In SAW based clock recovery systems, with clock fre-

quencies as high as 2.5 GHz, the device can provide a

clock-limiting function in systems.

The LG1605DXB is available in a hermetically sealed,

16-lead, glass-metal surface-mount package and uses

a standard ECL supply.

Pin Information

The pinout for the LG1605DXB is shown in Figure 2.

12-3223(F)

Figure 2. Pin Diagram

GND

V+REF

GND GND VBS

567

GND GND

VBF

V+IN

V–IN

V–REF

VSS

VBR

V+OUT

V–OUT

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