MAX3946ETG+T Maxim Integrated Products, MAX3946ETG+T Datasheet - Page 17

• Manufacturer Part Number: MAX3946ETG+T
• Description: IC LASER DVR SFP 11.3GBPS 24TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Driverr

Specifications of MAX3946ETG+T

• Data Rate: 11.3Gbps
• Number Of Channels: 1
• Voltage - Supply: 2.85 V ~ 3.63 V
• Current - Supply: 68mA
• Current - Modulation: 80mA
• Current - Bias: 80mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 12-WFQFN, Exposed Pad
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 5. Timing for 3-Wire Digital Interface
Bits 5 and 4: TXDE_MD[1:0]. Controls the mode of the transmit output deemphasis circuitry.
00 = deemphasis is fixed at 6.25% of the modulation amplitude
01 = deemphasis is fixed at 3.125% of the modulation amplitude
10 = deemphasis is programmed by the SET_TXDE register setting
11 = deemphasis is at its maximum of approximately 9%
Bit 3: TXEQ_EN. Enables or disables the input equalization circuitry.
0 = disabled
1 = enabled
Bit 2: SOFTRES. Resets all registers to their default values.
0 = normal
1 = reset
Bit 1: TX_POL. Controls the polarity of the signal path.
0 = inverse
1 = normal
Bit 0: TX_EN. Enables or disables the output circuitry.
0 = disabled
1 = enabled
Bit #
Name
Default Value
CSEL
CSEL
SCL
SDA
SCL
SDA
WRITE MODE
READ MODE
1.0625Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
t
t
L
L
A6
A6
______________________________________________________________________________________
7
X
X
t
t
CH
CH
0
0
t
t
CL
CL
A5
A5
1
1
t
t
DS
6
X
X
DS
A4
A4
2
2
A3
A3
TXDE_MD[1] TXDE_MD[0] TXEQ_EN
t
t
3
3
DH
DH
A2
A2
5
0
4
4
A1
A1
5
5
A0
A0
6
6
4
0
RWN
RWN
7
7
D7
8
8
D7
D6
3
0
9
9
D6
t
D
D5
10
10
SOFTRES
D5
Transmitter Control Register (TXCTRL)
D4
11
11
2
0
D4
D3
12
12
D3
TX_POL
D2
13
13
1
1
D2
D1
14
14
D1
TX_EN
D0
15
15
0
1
D0
t
t
T
T
ADDRESS
H0x05
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