MAX3946ETG+ Maxim Integrated Products, MAX3946ETG+ Datasheet - Page 18

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

Specifications of MAX3946ETG+

• 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

1.0625Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
Bit 7: FST[7]. When the V
voltage is above 2.75V, the POR resets all registers to their default values and the fault is cleared.
Bit 6: FST[6]. When the voltage at BMON is above V
Bit 4: FST[4]. When the voltage at BMAX goes above 1.3V, a HARD FAULT is reported.
Bit 3: FST[3]. When the common-mode voltage at V
Bit 2: FST[2]. When the voltage at V
Bit 1: FST[1]. When the BIAS voltage goes below 0.44V, a HARD FAULT is reported.
Bit 0: TX_FAULT. Copy of a FAULT signal in FST[7:6] and FST[4:1]. A POR resets the FST bits to 0.
Bit 3: IMODERR. Any attempt to modify SET_IMOD[8:1] above IMODMAX[7:0] flags a warning at IMODERR. (See the
Programming Modulation Current section.)
Bit 2: IBIASERR. Any attempt to modify SET_IBIAS[8:1] above IBIASMAX[7:0] flags a warning at IBIASERR. (See the
Programming Bias Current section.)
Bit 1: TXED. This indicates the absence of an AC signal at the transmit input.
Bits 7 to 0: SET_IBIAS[8:1]. The bias current DAC is controlled by a total of 9 bits. The SET_IBIAS[8:1] bits are used
to set the bias current with even denominations from 0 to 510 bits. The LSB (SET_IBIAS[0]) is controlled by the BIASINC
register and is used to set the odd denominations in the SET_IBIAS[8:0]. Any direct write to SET_IBIAS[8:1] resets the
LSB.
18
Bit #
Name
Default Value
Bit #
Name
Default Value
Bit #
Name
Default Value
_____________________________________________________________________________________
SET_IBIAS
(STICKY)
[8] (MSB)
FST[7]
7
X
7
X
X
7
0
CCT
SET_IBIAS
(STICKY)
FST[6]
[7]
6
X
supply voltage is below 2.3V, the POR circuitry reports a fault. Once the V
6
X
X
6
0
TOUTQ
SET_IBIAS
(STICKY)
[6]
5
X
X
5
X
X
5
0
goes below V
SET_IBIAS
(STICKY)
FST[4]
TOUTQ
CC
[5]
4
X
4
X
X
4
0
- 0.5V, a SOFT FAULT is reported.
CC
goes below V
- 0.8V, a HARD FAULT is reported.
SET_IBIAS
IMODERR
(STICKY)
(STICKY)
FST[3]
[4]
3
X
3
X
3
0
SET_IBIAS
IBIASERR
Bias Current Setting Register (SET_IBIAS)
(STICKY)
(STICKY)
CC
FST[2]
Transmitter Status Register 1 (TXSTAT1)
Transmitter Status Register 2 (TXSTAT2)
[3]
2
X
- 1.3V, a SOFT FAULT is reported.
2
X
2
0
SET_IBIAS
(STICKY)
(STICKY)
FST[1]
TXED
[2]
1
X
1
X
1
0
TX_FAULT
SET_IBIAS
(STICKY)
(STICKY)
[1]
0
X
0
X
X
0
1
CCT
ADDRESS
ADDRESS
ADDRESS
H0x06
H0x07
H0x08
supply