PHYSICAL LAYER PRODUCT

VSC7997, VSC7998

10.7 Gb/s Transimpedance Amplifier

BENEFITS:

High Gain with Low Power

Direct Connection to a Demux without a Post Amplifier

APD or PIN Diode Compatible

APPLICA TIONS:

SONET/SDH Networking

Transponder Modules

DWDM Systems

G.975/709 Forward Error Correction (FEC)

Gigabit Ethernet

Telecommunications Transmission Systems

Test Equipment

FEA TURES:

5KW Differential Transimpedance (VSC7997)

1.4KW Differential Transimpedance (VSC7998)

70mA Typical Supply Current

12pA/rtHz Typical Input Noise Current Density

Adjustable Output Offset

Low Group Delay

500

Ω

V

=0V

CC

+5V

4.8k

Ω

7.2k

Ω

10k

Ω

FBIN

10k

Ω

OFFP

OUTP

OUTN

OFFN

1957

µ

(77.0mil)

1957

µ (77.0mil)

1800

µ (70.9mil)

Top View

Pad 22

GND

Pad 23

GND

Pad 24

GND

Pad 25

IIN

Pad 26

GND

Pad 27

GND

Pad 28

GND

Pad 1

GND

Pad 2

VEE

Pad 3

VEE

Pad 4

VEE

Pad 5

VEE

Pad 6

VEE

Pad 7

GND

Pad 21

GND

Pad 20

FBIN

Pad 19

GND

Pad 18

OFFP

Pad 17

GND

Pad 16

OFFN

Pad 15

GND

Pad 14

GND

Pad 13

GND

Pad 12

OUTP

Pad 11

GND

Pad 10

OUTN

Pad 9

GND

Pad 8

GND

PA D DIAGRAM:

The outputs of the VSC7997 and VSC7998 are linear for inputs up to

250mAp-p and 1000mAp-p respectively. For higher inputs, the output limits at

typically 1000mV differential, increasing the dynamic range of the system by

reducing the possibility of exceeding the input voltage range of the limiting

amplifier or clock and data recovery circuit.

PB-VSC7997/7998-002

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