MAX2991
Power-Line Communications (PLC) Integrated
Analog Front-End Transceiver
General Description
The MAX2991 power-line communication analog front-
end (AFE) is a state-of-the-art integrated circuit that
delivers high integration and superb performance, while
reducing the total system cost. The MAX2991 is the first
AFE specifically designed for OFDM (orthogonal fre-
quency division multiplexing) modulated signal transmis-
sion over power lines. Operating in the 10kHz to 490kHz
band, the programmable filters allow compliance with
CENELEC, FCC, and ARIB standards using the same
device.
The MAX2991 transceiver provides two main paths:
transmit (Tx) path and receive (Rx) path. The transmit
path injects an OFDM modulated signal into the AC or
DC line. The transmit path is composed of a digital IIR
filter, digital-to-analog converter (DAC), followed by a
lowpass filter, and a preline driver. The receiver path is
for the signal enhancement, filtering, and digitization of
the received signal. The receiver is composed of a low-
pass and a highpass filter, a two-stage automatic gain
control (AGC), and an analog-to-digital converter (ADC).
The integrated AGC maximizes the dynamic range of the
signal up to 60dB, while the lowpass filter removes any
out-of-band noise, and selects the desired frequency
band. The ADC converts the enhanced and amplified
input signal to a digital format. An integrated offset can-
cellation loop minimizes the DC offset.
The MAX2991, along with the MAX2990 PLC baseband
modem, delivers the most cost-effective data communi-
Functional Diagrams
cation solution over power-line networks in the market.
The MAX2991 is specified over the -40NC to +85NC
temperature range and is available in a 48-pin LQFP
package.
Baseband
S
Integrated Band Select Filter, AGC, and 10-Bit
AVAILAB
LE
Features
S
Optimized to Operate with the MAX2990 PLC
ADC for Rx Path
S
Integrated Wave-Shaping Filter, Programmable
Predriver Gain, and 10-Bit DAC for Tx Path
S
Variable Sampling Rate Up to 1.2Msps
S
Built-In 60dB Dynamic Range AGC and DC Offset
Cancellation
S
Programmable Filters Operate in the CENELEC,
FCC, and ARIB Frequency Bands
S
Single 3.3V Power Supply
S
70mA Typical Supply Current (Half-Duplex Mode)
S
Extended Operating Temperature Range
Applications
Automatic Meter Reading
Home Automation
Heating Ventilation and Air Conditioning (HVAC)
Building Automation
Industrial Automation
Lighting Control
Sensor Control and Data Acquisition (SCADA)
Remote Monitoring and Control
Security Systems/Keyless Entry
Smart Grid
Ordering Information
PART
MAX2991ECM+
TEMP RANGE
-40NC to +85NC
PIN-PACKAGE
48 LQFP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit
MAX2990
MAX2991
HOST
APPLICATION
µC
MCU
INTERFACE
PHY
Tx BLOCK
AFE
Rx BLOCK
LINE
DRIVER
LINE
COUPLER
AC POWER
LINE
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5125; Rev 0; 1/10
MAX2991
Power-Line Communications (PLC) Integrated
Analog Front-End Transceiver
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND..........................................................-0.3V to +3.9V
All Other Inputs/Outputs.......................................-0.3V to +3.9V
Continuous Power Dissipation (T
A
= +70NC)
48-Pin LQFP (derate 25mW/NC above +70NC) ..........1535mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range .......................... -60NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.3V, V
GND
= 0V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER
Supply Voltage
Supply Current
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current
Shutdown Current
TRANSMITTER
DAC Resolution
DAC Sampling Rate
DAC Integral Nonlinearity
DAC Differential Nonlinearity
Lowpass Filter Cutoff-Frequency
Accuracy
INL
DNL
FCC, ARIB
CEN A
Narrowband
Full band
FCC, ARIB
Lowpass Filter -3dB Cutoff
Frequency (Note 1)
CEN A
Narrowband (Note 2)
Full band
FCC, ARIB
Stopband Attenuation
Includes digital IIR
filter
CEN A
Narrowband
Full band
Output-Voltage Swing
Total Cascaded IM3
Predriver Gain Range
2
SYMBOL
V
DD
I
DD
V
IH
V
IL
V
OH
V
OL
I
IL
I
SHDN
Source 5mA
Sink 5mA
Rx mode
Tx mode
CONDITIONS
MIN
3
TYP
3.3
70
36
MAX
3.6
100
50
0.8
UNITS
V
mA
V
V
V
V
FA
FA
DC CHARACTERISTICS (f
S
= 1200ksps)
2
2.4
0.4
-5
Global power-down mode
+5
+5
AC CHARACTERISTICS (f
S
= 1200ksps)
10
1200
Q2
Q0.5
Q5.0
Q3.0
Q5.0
Q5.0
470
90
134
560
28
28
28
28
1.5
-56
16
-50
V
P-P
dBc
dB
Maxim Integrated
Bits
ksps
LSB
LSB
%
kHz
dB
Predriver gain = 0dB,
frequency = 50kHz, 50I single-ended
IM3
In-band (Note 3)
MAX2991
Power-Line Communications (PLC) Integrated
Analog Front-End Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.3V, V
GND
= 0V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER
RECEIVER (Note 4)
Input Impedance
Receiver Dynamic Range
FCC, ARIB
Lowpass Filter Cutoff-Frequency
Accuracy
CEN A
Narrowband
Full band
FCC, ARIB
Lowpass Filter -3dB Cutoff
Frequency (Note 1)
CEN A
Narrowband (Note 2)
Full band
FCC, ARIB
Stopband Attenuation
CEN A
Narrowband
Full band
ADC Resolution
ADC Sampling Rate
ADC Integral Nonlinearity
ADC Differential Nonlinearity
Total Cascaded IM3
INL
DNL
IM3
Q0.5
Q0.5
-70
-60
At maximum gain
850
60
Q5.0
Q3.0
Q5.0
Q5.0
490
100
140
560
32
32
32
32
10
1200
Bits
ksps
LSB
LSB
dBc
dB
kHz
%
I
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Rx and Tx filter transfer functions for different bands are shown in Figure 1.
Note 2:
The
Applications Information
section shows how to configure the Tx and Rx corner frequencies for different bands.
Note 3:
Devices are tested with each tone at 0.7V
P-P
differential using the following two input frequencies:
f
IN1
= 200kHz and f
IN2
= 150kHz for FCC and ARIB
f
IN1
= 50kHz and f
IN2
= 80kHz for CENELEC A
f
IN1
= 60kHz and f
IN2
= 100kHz for narrowband
f
IN1
= 200kHz and f
IN2
= 300kHz for full band
Note 4:
The parameters were tested using the external highpass filter circuit in Figure 10.
Maxim Integrated
3
MAX2991
Power-Line Communications (PLC) Integrated
Analog Front-End Transceiver
Tx FILTER TRANSFER FUNCTION (CENELEC A)
MAX2991 toc00
Tx FILTER TRANSFER FUNCTION (NARROWBAND)
0
-10
AMPLITUDE (dBm)
-20
-30
-40
-50
-60
-70
MAX2991 toc01
10
0
AMPLITUDE (dBm)
-10
-20
-30
-40
-50
-60
50
60
70
80
90
100
110
10
120
50
80
110
140
170
200
FREQUENCY (kHz)
FREQUENCY (kHz)
Tx FILTER TRANSFER FUNCTION (FCC)
MAX2991 toc02
Tx FILTER TRANSFER FUNCTION (FULL BAND)
0
-10
AMPLITUDE (dBm)
-20
-30
-40
-50
-60
-70
MAX2991 toc03
10
0
-10
AMPLITUDE (dBm)
-20
-30
-40
-50
-60
-70
50
200
350
500
650
10
800
50
200
350
500
650
800
950
FREQUENCY (kHz)
FREQUENCY (kHz)
Rx FILTER TRANSFER FUNCTION (CENELEC A)
MAX2991 toc04
Rx FILTER TRANSFER FUNCTION (NARROWBAND)
0
AMPLITUDE (dBm)
-10
-20
-30
-40
-50
-60
MAX2991 toc05
10
0
AMPLITUDE (dBm)
-10
-20
-30
-40
-50
-60
50
70
90
110
130
10
150
50
80
110
140
170
200
FREQUENCY (kHz)
FREQUENCY (kHz)
Rx FILTER TRANSFER FUNCTION (FCC)
MAX2991 toc06
Rx FILTER TRANSFER FUNCTION (FULL BAND)
0
AMPLITUDE (dBm)
-10
-20
-30
-40
-50
-60
MAX2991 toc07
10
0
AMPLITUDE (dBm)
-10
-20
-30
-40
-50
-60
50
200
350
500
650
10
800
50
150 250 350 450 550 650 750 850
FREQUENCY (kHz)
FREQUENCY (kHz)
Figure 1. Rx and Tx Filter Transfer Functions for Different Bands
4
Maxim Integrated
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