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參數資料
| 型號： | MAX3798ETJ+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 20/35頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIMITING AMP/VCSEL DVR 32TQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 放大器類型： | 限制 |
| 電路數： | 1 |
| 輸出類型： | 差分 |
| 電流 - 電源： | 97mA |
| 電壓 - 電源，單路/雙路(±)： | 2.85 V ~ 3.63 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 32-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
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Design Procedure
Programming Bias Current
1) IBIASMAX[7:0] = Maximum_Bias_Current_Value
2) SET_IBIASi[8:1] = Initial_Bias_Current_Value
Note: The total bias current value is calculated using
the SET_IBIAS[8:0] register. SET_IBIAS[8:1] are the bits
that can be manually written. SET_IBIAS[0] can only be
updated using the BIASINC[4:0] register.
When implementing an APC loop it is recommended to
use the BIASINC[4:0] register, which guarantees the
fastest bias current update.
3) BIASINCi[4:0] = New_Increment_Value
4) If (SET_IBIASi[8:1]
≤ IBIASMAX[7:0]),
then (SET_IBIASi[8:0] = SET_IBIASi-1[8:0] + BIASINCi[4:0])
5) Else (SET_IBIASi[8:0] = SET_IBIASi-1[8:0])
The total bias current can be calculated as follows:
6) IBIAS = [SET_IBIASi[8:0] + 20] x 40μA
Programming Modulation Current
1) IMODMAX[7:0] = Maximum_Modulation_Current_Value
2) SET_IMODi[8:1] = Initial_Modulation_Current_Value
Note: The total modulation current value is calculated
using the SET_IMOD[8:0] register. SET_IMOD[8:1] are
the bits that can be manually written. SET_IMOD[0] can
only be updated using the MODINC[4:0] register.
When implementing modulation compensation, it is rec-
ommended to use the MODINC[4:0] register, which
guarantees the fastest modulation current update.
3) MODINCi[4:0] = New_Increment_Value
4) If (SET_IMODi[8:1]
≤ IMODMAX[7:0]),
then (SET_IMODi[8:0] = SET_IMODi-1[8:0] + MODINCi[4:0])
5) Else (SET_IMODi[8:0] = SET_IMODi-1[8:0])
The following equation is valid with assumption of 100
Ω
on-chip and 100
Ω external differential load (Rextd). The
maximum value that can be set for SET_TXDE[3:0] = 11.
6)
IMOD(Rextd=100Ω) = [(20 + SET_IMODi[8:0]) x 40μA]
For general Rextd, the modulation current that is
achieved using the same setting of SET_IMODi[8:0] as
for Rextd = 100
Ω is shown below. It can be written as a
function of IMOD(Rextd=100Ω), still assuming a 100Ω on-
chip load.
7)
Programming LOS Threshold
LOSTH = (SET_LOS[5:0] x 1.5mV)
Programming Transmit Output
Deemphasis
The TXDE_EN bit must be set to 1 to enable the deem-
phasis function. The SET_TXDE register value is used
to set the amount of deemphasis, which is a percent-
age of the modulation current. Deemphasis percentage
is determined as:
Where the maximum SET_TXDE[3:0] = 11.
For an IMOD value of 10mA, the maximum achievable
deemphasis value is approximately 20%. Maximum
deemphasis achievable for full IMOD range of 12mA is
limited to 15%.
With deemphasis enabled, the value of the modulation
current amplitude is reduced by the calculated deem-
phasis percentage. To maintain the modulation current
amplitude constant, the SET_IMOD[8:0] register must
be increased by the deemphasis percentage. If the sys-
tem conditions like temperature, required IMOD value,
etc., change during the transmit operation, the deem-
phasis setting might need to be readjusted. For such an
DE
SET TXDE
(%)
_[ : ]
=
×+
()
100
2
3 0
64
II
xt
MOD
xtd
MOD
xtd
(Re
)
(Re
)
Re
=×
+
=Ω
2
100
× +
_[ : ]
1
23 0
64
SET TXDE
Transmitter Deemphasis Control Register (SET_TXDE)
Bits 3 to 0: SET_TXDE[3:0]. This is a 4-bit register used to control the amount of deemphasis on the transmitter out-
put. When calculating the total modulation current, the amount of deemphasis must be taken into account. The
deemphasis is set as a percentage of modulation current.
MAX3798
1.0625Gbps to 10.32Gbps, Integrated, Low-
Power SFP+ Limiting Amplifier and VCSEL Driver
______________________________________________________________________________________
27
Bit #
7
6
5
4
3
2
1
0
ADDRESS
Name
X
SET_TXDE
[3] (MSB)
SET_TXDE
[2]
SET_TXDE
[1]
SET_TXDE
[0] (LSB)
Default Value
X
0
H0x10
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相關代理商/技術參數 |
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|---|---|
| MAX3799E/D | 功能描述:限幅放大器 1Gbps to 14Gbps SFP+ Multirate Limiting Amplifier and VCSEL Driver RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3799ETJ+ | 功能描述:限幅放大器 1-14Gbps SFP w/VCSEL Driver RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3799ETJ+T | 功能描述:限幅放大器 1-14Gbps SFP w/VCSEL Driver RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3799EVKIT+ | 功能描述:限幅放大器 Maxim Evaluation Kit RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
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