MAX2991ECM+T Maxim Integrated Products, MAX2991ECM+T Datasheet - Page 20

• Manufacturer Part Number: MAX2991ECM+T
• Description: IC TXRX FRONT-END 48LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX2991ECM+T

• Function: Analog Front-End Transceiver
• Interface: SPI Serial
• Number Of Circuits: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 36mA, 70mA
• Power (watts): 1.54W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Includes: Automatic Gain Control (AGC)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power-Line Communications (PLC) Integrated
Analog Front-End Transceiver
During normal data transmission bit C3 (= 0) is used to
indicate that a normal data packet is received and bits
C2, C1, and C0 are used to change the predriver gain
dynamically. In this case, C<2:0> maps onto predriver
gain-control bits as shown in Table 5.
This mode of operation is enabled if the bit PREDRDYN
in the Tx configuration register is set to 1.
Table 5. Predriver Dynamic Gain Programming
Table 6. External Highpass Filter Components for Different 3dB Frequencies
20
C3
0
0
0
0
0
0
0
0
_____________________________________________________________________________________
3dB CORNER (kHz)
Dynamic Predriver Gain Programming
C2
0
0
0
0
1
1
1
1
125
140
32
90
9
C1
0
0
1
1
0
0
1
1
During the Data Transmission
C0
0
1
0
1
0
1
0
1
PREDRIVER
Unchanged
GAIN (dB)
-8
-6
-4
0
2
4
6
C SELECTION (pF)
1000
270
100
68
68
PREDRVGAIN
Unchanged
<3>
0
0
0
0
0
0
1
Figure 10. External Highpass Filter Circuitry
R1 (kI) 1% TOLERANCE
PREDRVGAIN
Unchanged
<2>
0
0
0
1
1
1
0
8.25
8.66
8.25
8.66
7.87
LPFOUT
LPFOUT
C
C
PREDRVGAIN
C
C
Unchanged
External Highpass Filter
R1
R1
<1>
0
1
1
0
1
1
0
C
C
R2 (kI) 1% TOLERANCE
R2
R2
37.4
38.3
37.4
39.2
35.7
HPFOUT
HPFIN
HPFIN
HPFOUT
PREDRVGAIN
Unchanged
<0>
1
0
1
1
0
1
0