Datasheet SE1230Q Datasheet (SIGE)

2

A

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Applications

 SONET/SDH-based transmission systems, test

equipment and modules

 OC-48 fibre optic modules
 Gigabit Ethernet
 Fibre Channel
 Wideband RF gain block

Features

 Single +3.3 V supply
 Power dissipation = 230 mW (typ)
 Noise figure < 12 dB
 Small signal gain = 23.5 dB differential
 Fully integrated AGC function
 On-chip 50 Ω input and output terminations
 Wide bandwidth (–3 dB) > 2.0 GHz
 Maximum input level of 200 mVpk
 AGC output level of 370 mVpk differential
 Loss of signal functionality
 Single-ended or differential operation
 Minimal external components
 Operating ambient temperature range = -40°C to

+85°C

 Equivalent to Nortel Networks AC10

Ordering Information

SE1230Q

Final

Product Description

SiGe Semiconductor offers a portfolio of optical
networking ICs for use in high-performance optical
transmitter and receiver functions, from 155 Mb/s up
to 12.5 Gb/s.

SiGe Semiconductor’s SE1230 is a fully integrated
AGC amplifier aimed primarily at SONET OC-48 and
SDH STM-16 systems. The device may also be used
in any datacom application with input data rates up to

2.5 Gb/s.

The device is designed with differential I/Os and
signal levels compatible with SiGe Semiconductor’s
SE1030 and SE1031 transimpedance amplifiers. A
system block diagram is shown after the functional
description, on page 4.

Optimum performance is provided by differential
connections but with appropriate terminations, the
device can also be used in single-ended mode if
required by the application.

Type Package Remark

SE1230Q 5 mm, 32 pin LQFP None

Functional Block Diagram

INP

INN

LOS

LOS_INIT

SE1230
AGC Amp

2.5 Gb/s

Recti fie r/

Comparator

Variable

OUTN OUTP

Gain

Vref

OUTP

Outp ut

Integr ator

Bandgap

Ref

Buffer

Recti fi er

Vref1

GC_ADJ

OUTN

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A

Pin Out Diagram

SE1230Q

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Final

Pin Out Description

GND

GND

INP

GND

INN

GND

VCC

VCC

VCC

VCC

323130

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15

GND

GND

DNC

DNC DNC

2928272625

Top

View

LOS

VCC

VCC

GC_ADJ

LOS_INIT

VCC VCC

24

23

22

21

20

19

18

17
16

16

GND

GND

GND

GND

OUTP

GND

OUTN

GND

VCC

VCC

Pin No. Name Description

1 GND Negative supply (0 V)

2 GND Negative supply (0 V)

3 INP

4 GND Negative supply (0 V)

5 INN

6 GND Negative supply (0 V)

7 VCC Positive supply (3.3 V)

8 VCC Positive supply (3.3 V)

9 GND Negative supply (0 V)

10 GND Negative supply (0 V)

11 LOS Loss of signal output (open collector)

12 VCC Positive supply (3.3 V)

13 VCC Positive supply (3.3 V)

14 LOS_INIT Sets initial state of LOS output

Non-inverting input (50 Ω impedance)

Inverting input (50 Ω impedance)

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LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Pin No. Name Description

15 GND Negative supply (0 V)

16 GND Negative supply (0 V)

17 VCC Positive supply (3.3 V)

18 VCC Positive supply (3.3 V)

19 GND Negative supply (0 V)

SE1230Q

Final

20 OUTN

21 GND Negative supply (0 V)

22 OUTP

23 GND Negative supply (0 V)

24 GND Negative supply (0 V)

25 VCC Positive supply (3.3 V)

26 VCC Positive supply (3.3 V)

27 AGC_ADJ AGC output level adjust

28 DNC Do not connect

29 DNC Do not connect

30 DNC Do not connect

31 VCC Positive supply (3.3 V)

32 VCC Positive supply (3.3 V)

Inverted output (50 Ω impedance)

Non-inverted output (50 Ω impedance)

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A

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Functional Description

The SE1230 is configured as a variable gain amplifier,
with automatic gain control. It comprises a variable-

gain block driving a 50 Ω output driver (see the

functional block diagram on page 1). The device
requires a single +3.3 V power supply.

System Inputs

The inputs INP and INN are differential and are each

internally terminated to 50 Ω. To avoid problems with

offset or common-mode voltage, use AC-coupling for
differential or single-ended connection (for the latter,

AC-couple the unused input to ground via 50 Ω). The

maximum input level is 200 mVpk, applied single­ended or differentially.

System Outputs

The outputs OUTP and OUTN are differential and are

each internally terminated to 50 Ω. To avoid

problems with offset or common-mode voltage, use
AC-coupling for differential or single-ended
connection (for the latter, AC-couple the unused

output to ground via 50 Ω). The default output level

(under AGC) is 370 mVpk differential.

System Block Diagram

SE1230Q

Final

Automatic Gain Control (AGC)

A rectifier compares the output signal voltage with a
reference level to invoke gain control. When
operating in the controlled gain region, the fully
integrated long time-constant integrator provides
filtered control voltages to the variable gain stages to
maintain a fixed output level. This output level may
be varied by injecting current into AGC_ADJ (leave
unconnected if adjustment is not required).

Loss of Signal

A two-level comparator block is used to detect the
input signal level. If it drops below the lower
threshold, LOS goes low. This output is an open
collector to allow wired-OR connection to other
system alarm signals; it requires an external pull-up
resistor. It goes high only when the input level
exceeds the upper comparator threshold level. If this
function is not required, LOS may be left
unconnected.

By connecting an external series-RC to the LOS_INIT
pin, LOS can be forced low on first power up if the
signal level is between the upper and lower
comparator thresholds. If this function is not required,
leave LOS_INIT unconnected.

Receiver Module

2.5 GHz

2.5 Gb/s

2

2

Clock

Clock & Data

Data

Recovery

2

SE1230Q

GC

2

SE1030/31

TZ

Amplifier

PIN

Amplifier

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SE1230Q

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Final

Absolute Maximum Ratings

These are stress ratings only. Exposure to stresses beyond these maximum ratings may cause permanent damage
to, or affect the reliability of the device. Avoid operating the device outside the recommended operating conditions
defined below.

Symbol Parameter Min Max Unit

VCC Supply Voltage –0.5 5.0 V

VIO Voltage at any input or output –0.5 VCC+0.5 V

I

IO

IIO Current sourced into pins OUTP and OUTN –40 40 mA

V

ESD

Tstg Storage Temperature –65 150

Recommended Operating Conditions

Symbol Parameter Min Typ Max Unit

Current sourced into any input or output, except
OUTP and OUTN

Electrostatic Discharge (100 pF, 1.5 kΩ), all pins

–20 20 mA

–2 2 kV

°C

VCC Supply Voltage 3.1 3.3 3.5 V

I

LOS Output Load Current 5 mA

LOS

R

LOS_INIT Resistor 1

LOSI

C

LOS_INIT Capacitor (increase value for slow

LOSI

I

AGC_ADJ

Ta Operating Ambient Temperature –40 85

Note 1: This current can be produced by connecting a suitable resistor between VCC and AGC_ADJ.

power supply rise time)

AGC Threshold Adjust Input Current (on

AGC_ADJ pin) – note 1

1

0 150

kΩ

µF

µA

°C

DC Electrical Characteristics

Symbol Parameter Min Typ Max Unit

ICC Supply current 70 100 mA

PD Power Dissipation 230 350 mW

V

V

RT Input/Output Termination Resistance 50

Open-circuit AGC_ADJ Voltage 0.37 V

AGC_ADJ

Output Low Voltage on LOS, with I

LOS

= 1 mA 0.4 V

LOS

Ω

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SE1230Q

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

AC Electrical Characteristics

Symbol Parameter Min Typ Max Unit

BW (3dB) Small Signal Bandwidth at –3dB point 2.0 GHz

Gain

Vin

Small Signal Gain (f = 100 MHz), differential input /
output

21 23.5 26 dB

Maximum Input Signal Level 200

Input Signal Level at AGC Threshold (I

0 µA) – note 2

AGC_ADJ =

25

Lower LOS Threshold (LOS = low) 5 8

Upper LOS Threshold (LOS = high) 12 18

mV pk

(differential)

Final

Output AGC Signal Level (I

V

out

Output AGC Signal Level (I

AGC_ADJ =

AGC_ADJ =

0 µA) – note 3
150 µA) – note

3

250 370 500

80 170 300

(differential)

mV pk

S11 Input Reflection Coefficient (< 1.3 GHz) –10 dB

S22 Output Reflection Coefficient (< 1.3 GHz) –10 dB

NF Noise Figure (diff. in / diff. out) 12 dB

tR / tF

Note 2: Vin at AGC threshold is calculated by dividing V
Note 3: Measured at Vin = 100 mV pk , f = 100 MHz. For intermediate values of I

Output Rise / Fall Time (Input rise / fall time = 20
ps)

by the small signal gain.

out

120 ps

AGC_ADJ

the output

amplitude can be estimated by linear interpolation.

DC and AC electrical characteristics are specified over the recommended operating conditions, and with load resistor
(R

) of 50 Ω, AC coupled via 100 nF, for each output. All characteristics are specified for differential signals on inputs

L

and outputs.

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LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Package Information

The device is packaged in a 5 mm, 32 pin plastic low profile quad flat pack (LQFP).

Package Outline

SE1230Q

Final

Package Dimensions

Dimension Min (mm) Nom (mm) Max (mm)

Lead Count 32

Lead Pitch (E) 0.5

Body Size (D1) 5.00

Component Tip-to-Tip (D) 7.00

Component Height (A) 1.60

Component Standoff 0.05 0.15

Body Thickness (A2) 1.35 1.40 1.45

Lead width (plated) (B) 0.17 0.22 0.27

Lead Thickness (plated) (C) 0.09 0.175

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SE1230Q

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Final

Applications Information

For optimum performance it is recommended that the device be used in differential mode with the circuit shown in the
diagram below. Components connected to LOS, LOS_INIT and AGC_ADJ are optional, depending on whether or not
the loss of signal and/or AGC adjust functions are required.

+3.3 V

TZ Amp,

50 Ω outputs

10 kΩ

LOS

OUTP

OUTN

LOS_INIT

VCC

100 nF

INP

INN

100 nF

GC_ADJ

AGC Amp

SE1230Q

GND

100 nF

100 nF

To system
alarm circuits

CDR,

50 Ω inputs

R

I

AGC_ADJ

0 V

LOSI

1 kΩ

C

LOSI

µ

1

F

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SE1230Q

LightCharger™ 2.5 Gb/s Automatic Gain Control Amplifier

Final

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Product Preview
The datasheet contains information from the product concept specification. SiGe Semiconductor Inc. reserves the right to change
information at any time without notification.

Preliminary Information
The datasheet contains information from the design target specification. SiGe Semiconductor Inc. reserves the right to change
information at any time without notification.

Final
The datasheet contains information from the final product specification. SiGe Semiconductor Inc. reserves the right to change
information at any time without notification. Production testing may not include testing of all parameters.

Information furnished is believed to be accurate and reliable and is provided on an “as is” basis. SiGe Semiconductor Inc. assumes
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49-DST-01  Rev 1.4  Apr 29/02 9 of 9