Rainbow-electronics MAX3799 Bedienungsanleitung PDF herunterladen (Seite 25)

Bit 2: IBIASERR. When the bias incremented result is greater than IBIASMAX, then a SOFT FAULT is reported. See

the

Programming Bias Current

section.

Bit 1: TXED. This only indicates the absence of an AC signal at the transmit input. This is not an LOS indicator.

Bias Current Setting Register (SET_IBIAS)

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]) bit is controlled by

the BIASINC register and is used to set the odd denominations in the SET_IBIAS[8:0].

Modulation Current Setting Register (SET_IMOD)

Bits 7 to 0: SET_IMOD[8:1]. The modulation current DAC is controlled by a total of 9 bits. The SET_IMOD[8:1] bits

are used to set the modulation current with even denominations from 0 to 510 bits. The LSB (SET_IMOD[0]) bit is

controlled by the MODINC register and is used to set the odd denominations in the SET_IMOD[8:0].

Maximum Modulation Current Setting Register (IMODMAX)

Bits 7 to 0: IMODMAX[7:0]. The IMODMAX register is an 8-bit register that can be used to limit the maximum modu-

lation current. IMODMAX[7:0] is continuously compared to the SET_IMOD[8:1].

Maximum Bias Current Setting Register (IBIASMAX)

Bits 7 to 0: IBIASMAX[7:0]. The IBIASMAX register is an 8-bit register that can be used to limit the maximum bias

current. IBIASMAX[7:0] is continuously compared to the SET_IBAS[8:1].

MAX3799

1Gbps to 14Gbps, SFP+ Multirate Limiting

Amplifier and VCSEL Driver

______________________________________________________________________________________ 25

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name

SET_IBIAS

[8] (MSB)

SET_IBIAS

[7]

SET_IBIAS

[6]

SET_IBIAS

[5]

SET_IBIAS

[4]

SET_IBIAS

[3]

SET_IBIAS

[2]

SET_IBIAS

[1]

Default Value 0 0 0 0 0 1 0 0

H0x08

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name

SET_IMOD

[8] (MSB)

SET_IMOD

[7]

SET_IMOD

[6]

SET_IMOD

[5]

SET_IMOD

[4]

SET_IMOD

[3]

SET_IMOD

[2]

SET_IMOD

[1]

Default Value 0 0 0 1 0 0 1 0

H0x09

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name

IMODMAX

[7] (MSB)

IMODMAX

[6]

IMODMAX

[5]

IMODMAX

[4]

IMODMAX

[3]

IMODMAX

[2]

IMODMAX

[1]

IMODMAX

[0] (LSB)

Default Value 0 0 1 1 0 0 0 0

H0x0A

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name

IBIASMAX

[7] (MSB)

IBIASMAX

[6]

IBIASMAX

[5]

IBIASMAX

[4]

IBIASMAX

[3]

IBIASMAX

[2]

IBIASMAX

[1]

IBIASMAX

[0] (LSB)

Default Value 0 0 0 1 0 0 1 0

H0x0B

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 34 35

Amplifier and VCSEL Driver 1

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