Datasheet

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General Description

The MAX3654 analog transimpedance amplifier (TIA) is

designed for CATV applications in fiber-to-the-home

(FTTH) networks. This high-linearity amplifier is intended

for 47MHz to 870MHz subcarrier multiplexed (SCM) sig-

nals in passive optical networks (PON). A gain-control

input supports AGC operation with optical inputs hav-

ing -6dBm to +2dBm average power. With 62dBΩ max-

imum gain at 47MHz and 18dB gain control range, the

minimum RF output level is 14dBmV/channel at -6dBm

optical input. A compact 4mm x 4mm package

includes all of the active RF circuitry required to convert

analog PIN photocurrent to a 75Ω CATV output.

This 700mW SiGe RF IC provides a low-cost, low-power

integrated analog CATV receiver solution for FTTH ONTs.

Applications

FTTH Optical Network Termination (ONT)

Features

♦ 47MHz to 870MHz Operation

♦ -6dBm to +2dBm Optical Input Range

♦ 21dBm OIP3, 47dBm OIP2

♦ 5.5pA/√Hz EIN (Amplifier Alone)

♦ 62dB Gain at 47MHz

♦ 18dB Transimpedance (Gain) Control

♦ Integrated +4dB Gain Tilt (with Typical Photodiode)

♦ +5V Single-Supply Operation

♦ 700mW Power Dissipation

♦ -40°C to +85°C Operating Temperature Range

♦ 4mm x 4mm TQFN Package

MAX3654

47MHz to 870MHz Analog CATV

Transimpedance Amplifier

________________________________________________________________ Maxim Integrated Products 1

19-3745; Rev 0; 7/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG-CODE

MAX3654ETE+

-40°C to +85°C 16 TQFN - E P *

T1644F-4-A

Pin Configuration appears at end of data sheet.

+ Denotes lead-free package.

*EP = Exposed pad.

DRIVE

OUT+

-6 TO

+2dBm

+5V TO

+12V

0.001µF

10µH

FERRITE BEAD

1kΩ

1kΩ 100kΩ

0.001µF

OUT-

IN+

IN-

MUTE

HYST

75Ω

1:1

HYSTVAGC

OPAMP

MAX3654

FTTH VIDEO TIA

+5V

TIA

Typical Application Circuit

Summary of content (8 pages)

PAGE 1
9-3745; Rev 0; 7/05 47MHz to 870MHz Analog CATV Transimpedance Amplifier Features The MAX3654 analog transimpedance amplifier (TIA) is designed for CATV applications in fiber-to-the-home (FTTH) networks. This high-linearity amplifier is intended for 47MHz to 870MHz subcarrier multiplexed (SCM) signals in passive optical networks (PON). A gain-control input supports AGC operation with optical inputs having -6dBm to +2dBm average power.
PAGE 2
MAX3654 47MHz to 870MHz Analog CATV Transimpedance Amplifier ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC.............................................-0.3V to +6.0V IN+, IN-, VAGC, OUT+, OUT-, MUTE, HYST.........-0.3V to +5.5V TEST1, TEST2........................................................-0.3V to +5.5V Output Current (OUT+, OUT-) ............................................56mA Continuous Power Dissipation, 16-Lead TQFN-EP Package (TA = +70°C) (derate 16.9mW/°C above +70°C)....1349.
PAGE 3
47MHz to 870MHz Analog CATV Transimpedance Amplifier MAX3654 +5V MINI-CIRCUITS ADTL 1-12* 0.001µF 12Ω* MINI-CIRCUITS ADTL 0.001µF 1-18-75 VCC IN+ OUT+ 0.001µF MAX3654 12Ω* 75Ω OUT- IN- 0.001µF VAGC GND *FOR 75Ω INPUT IMPEDANCE USE 25Ω RESISTORS AND ADTL 1-18-75 OIP2, OIP3 TEST CIRCUIT +5V ** * +5V 1kΩ 0.001µF VCC 0.001µF IN+ 75Ω OUT+ MAX3654 0.001µF SEE PHOTODIODE MODEL IN FIGURE 2 MINI-CIRCUITS ADTL 1-18-75 OUT- IN- 0.001µF VAGC GND 1kΩ ** * GAIN, GAIN vs.
PAGE 4
MAX3654 47MHz to 870MHz Analog CATV Transimpedance Amplifier 5Ω 5nH 1nH 44dB TO 50dB 0.6pF 0.1pF 0.6pF 5Ω 0.6pF 50dB TO 56dB TIA IN+/- 5nH 1nH 0.1pF 56dB TO 62dB OUT+/- MAX3654 MUTE Figure 2. Photodiode and Header Model HYST VAGC Figure 3. Functional Diagram Typical Operating Characteristics (VCC = +5.0V, TA = +25°C, unless otherwise noted.) MAXIMUM GAIN vs. FREQUENCY (VAGC = 0V) 65 64 63 62 5.5 5.0 55 50 4.5 -40°C 4.0 +25°C 3.5 +85°C 3.0 45 61 2.
PAGE 5
47MHz to 870MHz Analog CATV Transimpedance Amplifier -4 -6 0.2 -8 S22 (dB) 0.4 0 -0.2 20 18 16 14 -10 -12 12 -0.6 -16 4 -0.8 -18 2 6 -20 +85°C NO PHOTODIODE 0 0 200 400 600 FREQUENCY (MHz) 800 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) 1000 OIP3 vs. CONTROL VOLTAGE OIP2 vs.
PAGE 6
47MHz to 870MHz Analog CATV Transimpedance Amplifier MAX3654 Pin Description PIN NAME FUNCTION 1, 4, 9, 12 VCC 2 IN+ Positive Analog Photodiode Input Connection. Typically connected to photodiode cathode. 3 IN- Negative Analog Photodiode Input Connection. Typically connected to photodiode anode. 5 VAGC AGC Control Input. Range is 0 to 1.4V. See the Typical Operating Characteristics Gain vs. Control Voltage graph. 6 MUTE Mute Control Input, TTL. MUTE < 0.8V to mute output. +5.
PAGE 7
47MHz to 870MHz Analog CATV Transimpedance Amplifier When connected as shown in the Typical Applications Circuit, the MAX3654 will maintain the electrical output constant (15dBmV/ch) for optical signals in the -6dBm to +2dBm range. TOP VIEW VCC  175mV  ZT(dBΩ) = 62dBΩ + 20 × log   VAGC(mV)  (0.175V ≤ VAGC ≤ 1.4V).
PAGE 8
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) For the latest package outline information, go to www.maxim-ic.com/packages.) (TQFN 4mm x 4mm x 0.8mm, Package Code: T1644.) 24L QFN THIN.EPS MAX3654 47MHz to 870MHz Analog CATV Transimpedance Amplifier PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.