Datasheet VSC7958X, VSC7958CC Datasheet (VITESSE)

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7958

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

Features

• 2.5Gb/s Data Rates (OC-48/SDH-16)

• Input Offset Error Cancellation

• Single 5V Power Supply

• Fully Differential Architecture

General Description

The Vitesse high speed limiting amplifier is intended for use as a post amplifier in wide band fiber optic
links with data rates up to 2.5 Gb/s. Thi s amplifi er provi des ver y high sensit ivity an d broadband op erat ion wit h a
fully differential architecture. Additional features include on-chip, offset-correction circuitry to provide excel­lent pulse width distortion characteristics.

VSC7958 Block Diagram

VBR

VSS GND

VREF-

VIN-

VIN+

VREF+

50

50

Chip Boundary

A1 A2

+-

VBF VBS

VOUT­VOUT+

G52184-0, Rev 3.0 Page 1
05/14/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

VITESSE

SEMICONDUCTOR CORPORATION

2.5Gb/s High Speed Limiting Post Amplifier

Preliminary Data Sheet

for OC-48/SDH-16 Applications

T able 1: Electrical Specifications

All min and max values are tested at VSS = -4.5V and -5.5V, unless otherwise noted. All min and max values are guaranteed from
T

= 0°C to 85°C, unless otherwise noted.

CASE

Symbol Parameter Min Typ Max Units Conditions

(1)

VIN±

+) - (VIN-)

(V

IN

+) - (V

(V

REF

(V

+) - (V

OUT

V

OFFSET

PW% Output Pulse Width 90 100 110 %

, t

t

R

F

G Small Signal Gain 26 30 45 dB

(1)

f

MAX

(1)

f

MIN

(1)

S

11

(1)

S

22

I

SS

(1)

NF

(1)

V

NR

θ

JC

NOTE:(1) These values are not measured during production test. These values are results of engineering characterization.

Input Voltage Swing - - 800 mV

(1)

Input Voltage Swing - - 1600 mV

-) Input Offset Voltage Swing - 10 25 mV VIN = 0

REF

Single-ended source

p-p

Differential source

p-p

Differential Output Swing.

-) Output Voltage Swing 320 500 1200 mV

OUT

p-p

V

IN

Input peak-to -peak

Output DC Offset Voltage - -0.5 - V Measured to ground

Rise and Fall Time - 100 - ps

20%-80%, 25°C,
V

IN

V

IN

ended
Small Signal -3dB Bandwidth - 3 - GHz 25°C, VIN = 4mV
Low Frequency -3dB Cutoff - 30 - kHz 25°C, VIN = 4mV
Input Return Loss Reference to 50Ω - 15 - dB At 1. 5GHz
Output Return Loss Reference to 50Ω - 15 - dB At 1.5 GHz
Supply Current - 80 100 mA
Noise Figure - 15 - dB 8kHz to 18GHz

Total single-ended output
Input Referred Wide Band Noise - 170 - µV

noise voltage divided by

rms

small-signal gain. 8kHz to

18GHz
Thermal Resistance - 30 - °C/W Junction-to-case

= 8mV, Differential

= 50mV
= 4mV

VSC7958

single-

p-p

p-p

p-p

Page 2 G52184-0, Rev 3.0

© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca l le Pl an o • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

05/14/01

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7958

Figure 1: Typical Output Voltage vs. Input Voltage of Limiting Amplifier

1000

100

10

Single-Ended Output Voltage (mV)

Absolute Maximum Ratings

Output Voltage vs. Input Voltage

1

1

13

Single-Ended Input Voltage (mV)

(1)

(at TA = 25°C unless otherwise specified)

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

20 100 260 500

Power Supply Voltage (VSS) ...............................................................................................................-7V to -0.5V

Power Dissipation.............................................................................................................................................. 1W

All Pins............................................... ........ .........................................................................................V

SS

(VREF+) - (VIN+): ..........................................................................................................................................±2V

(VREF-) - (VIN-): ........................................................................................................................................... ±2V

Storage Temperature Range (T

)................................................................................................ -40°C to 125°C

STG

Operating Temperature Range ............................................................................................................0°C to 100°C

NOTE: (1) CAUTION: Stresses listed under “Absolute Maximum Ratings” may be applied to devices one at a time without caus-

ing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended
periods may affect device reliability.

to + .5V

Recommended Operating Conditions

Case Temperature Range (TC)..............................................................................................................0°C to 85°C

Negative Voltage Rail (V
Bit Rate = 2.488Gb/s NRZ and data pattern = 2

G52184-0, Rev 3.0 Page 3
05/14/01

).............................................................................................................-5.5V to -4.7V

SS

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

23

-1 PRBS, unless otherwise specified.

Internet: www.vitesse.com

VITESSE

SEMICONDUCTOR CORPORATION

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

Package Pin Descriptions

Figure 2: Pin Configuration

GND

GND

GND

1

VOUT+

VOUT-

GND

2

VSC7958

3

4

5678

GND

GND

(TOP VIEW)

.230

VBS

VSS

VBF

1315 1416

VBR

Preliminary Data Sheet

VSC7958

12

11

10

9

VREF+

.030

VIN+
VIN-

VREF-

.012

.366

.050

0.005

(SIDE VIEW)

*All values are typical in inches

Page 4 G52184-0, Rev 3.0

© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca l le Pl an o • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

05/14/01

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7958

Package Information

D1

D

A2

2.5Gb/s High Speed Limiting Post Amplifier

Figure 3: Package Dimensions

E1

A

e

for OC-48/SDH-16 Applications

E

Key Dimension Tolerance

A0.054REF
A1 0.003 ±0.003
A2 0.050 REF

D 0.366 ±0.010
D1 0.225 ±0.005

E 0.366 ±0.010
E1 0.225 ±0.005

L 0.020 ±0.005

e0.030REF
b0.012Typ.
θ 0-10

R 0.013 ±0.003
R1 0.013 ±0.003

Shoulder 0.020

All Dimensions in inches

R

— C — — C —

θ

L

G52184-0, Rev 3.0 Page 5
05/14/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Sholder

b

R1

LEAD COPLANARITY

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

A1

VITESSE

SEMICONDUCTOR CORPORATION

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

Die Information

Figure 4: Die Pad Information

1233µm

Pad 18

VREF_N

Pad19

VDD

Pad 20
VIN_N

Pad 21

VDD

Pad 22

VDD

Pad 17

VREFC_N

Pad 16

VBR

Pad 15
VSS_C

Pad 14

VSS

VSC7958

T op Vie w

1705

µm

Pad 13

VSS

Pad 12

VDD

Preliminary Data Sheet

VSC7958

Pad 11

VDD

Pad 10

VDD

Pad 9

EDGE_SENSE

Pad 8

VDD

Pad 7

VDD

Pad 15

Pad 6

GND

VOUT_N

Pad 5

VDD

Pad 4

VDD

Pad 23
VIN_P

Pad 24

VDD

Pad 25
VREF_P

Pad 26

VREFC_P

Pad 27

VBF

Pad 28

VBS

Maximum Total Die Size: 1233µm x 1705µm
Die Thickness: 305µm
Pad Size: 100µm x 100µm
Pad Passivation Opening: 90µm x 90µm

This device requires external components when used in die form.
Please contact your Vitesse sales representative for information.

Pad 29

VDD

Pad 30

VDD

Pad 31

VDD

Pad 3

VOUT_P

Pad 2

VDD

Pad 8

VDD

Page 6 G52184-0, Rev 3.0

© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca l le Pl an o • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

05/14/01

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7958

Table 2: Pin Identifications

Pin # Name Function

1, 4, 5, 6, 15 , 16,

and bottom heat

spreader

2 VOUT+ POSITIVE DATA OUTPUT
3 VOUT- NEGATIVE DATA OUTPUT
7 VSS NEGATIVE DC SUPPLY

8VBR

9VREF-

10 VIN- NEGATIVE DATA INPUT
11 VIN+ POSITIVE DATA INPUT

12 VREF+

13 VBF

14 VBS

GND

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

DEVICE GROUND
The package bottom heat spreader should be connected to ground for the optimum thermal
and electrical performance.

DEVICE REFERENCE VOLTAGE
This pin can either float or be set to an external -1.5V supply.

NEGATIVE DATA INPUT REFERENCE
This pin should be bypassed to ground with a 0.1µF cap and a 5Ω series resistor.

POSITIVE DATA INPUT R EFERENCE
This pin should be bypasSed to ground with a 0.1µF cap and a 5Ω series resistor.

INTERNAL TEST POINT
Do not connect.

INTERNAL TEST POINT
Do not connect.

Ordering Informatio n

The order number for this product is formed by a combination of the device number, and package style.

VSC7958

Device Type

VSC7958: 2.5Gb/s Limiting Amplifier

Notice

Vitesse Semiconductor Corporation (“Vitesse”) provides this document for informational purposes only. This document contains pre-production
information about Vitesse products in their con ce pt , development and/or testing phase . All i nformation in this document , inc lu d in g de scriptions of
features, functions, performan ce, technical specifications and availability, is subject to change wi th out notice at any ti me. Nothing contained in this
document shall be c ons trued as e xten ding an y w arran ty or pr omise , e xp ress or imp lied , th at a ny Vitesse produ ct wi ll b e av ail able as described or
will be suitable for or will accomp lis h any particular task.

Vitesse products are not intended for use in life support applia nc es, devices or systems. Use of a Vitesse product in such applications without writ­ten consent is prohibited.

G52184-0, Rev 3.0 Page 7
05/14/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

XX

Package Style

CC: (Metal Glass - Formed Leads)

X : (Bare Die)

VITESSE

SEMICONDUCTOR CORPORATION

2.5Gb/s High Speed Limiting Post Amplifier
for OC-48/SDH-16 Applications

This page left intentionally blank.

Preliminary Data Sheet

VSC7958

Page 8 G52184-0, Rev 3.0

© VITESSE SEMICONDUCTOR CORPORATION • 741 Ca l le Pl an o • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]

Internet: www.vitesse.com

05/14/01