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參數(shù)資料
| 型號(hào)： | MAX3762EEP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LIMITING 622MBPS 20-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 限幅放大器 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-QSOP |
| 包裝： | 帶卷 (TR) |
__________Applications Information
Converting Average Optical Power to
Signal Amplitude
Many of the MAX3761/MAX3762’s specifications relate
to input-signal amplitude. When working with fiber optic
receivers, the input is usually expressed in terms of
average optical power and extinction ratio. The rela-
tions given in Table 1 are helpful for converting optical
power to input signal when designing with the
MAX3761/MAX3762.
In an optical receiver, the input voltage to the limiting
amplifier can be found by multiplying the relationship in
Table 1 with the photodiode responsivity (p) and tran-
simpedance amplifier gain (G).
Optical Hysteresis
Power and hysteresis are often expressed in decibels.
By definition, decibels are always 10log (power). At the
inputs to the MAX3761/MAX3762 limiting amplifier, the
power is VIN2/R. If a receiver’s optical input power (x)
increases by a factor of two, and the preamplifier is lin-
ear, then the voltage input to the MAX3761/MAX3762
also increases by a factor of two.
The optical power change is 10log(2x / x) = 10log(2) =
+3dB
At the MAX3761/MAX3762, the voltage change is:
In an optical receiver the dB change at the MAX3761/
MAX3762 will always equal 2x the optical dB change.
The MAX3761/MAX3762’s typical voltage hysteresis is
3.6dB. This provides an optical hysteresis of 1.8dB.
Input Sensitivity
The receiver’s gain sensitivity defines the smallest signal
input that results in fully limited PECL-compatible data
outputs. Smaller signals result in nonlimited outputs. The
MAX3761/MAX3762’s input sensitivity (SGAIN) is 4mVp-p:
SGAIN = 4mV
Optical gain sensitivity (in dBm) is:
In a receiver with G = 6k
Ω, re = 10, and ρ = 0.8A/W,
gain sensitivity is 510nW, or -32.9dBm.
622Mbps ATM Component Selection
As an example, a preamplifier with a 150kHz low-
frequency cutoff and a 950mVp-p maximum output has
the best performance with the following selections:
CIN = 5.6nF, so that fC = 15kHz (one decade below the
150kHz cutoff)
CAZ = 150pF, so that fOC < 1.5kHz (one decade
below fC)
CFILTER = 100pF, so that the integration frequency
equals 3MHz.
These selections should provide data-dependent jitter
less than 110ps p-p when the input consists of PRBS
data with no more than 72 consecutive bits.
10log
S
2G
xx
GAIN
ρ
r
e
+
1
1000
10
2
20
2
log
log(
)
log
2V
/ R
V/ R
IN
()
==
(()
26
=+ dB
MAX3761/MAX3762
Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
_______________________________________________________________________________________
9
Table 1. Optical-Power Relations*
TIME
P0
P1
PAVE
Figure 4. Optical-Power Relations
SYMBOL
RELATION
Average
Power
PAVE
PARAMETER
Extinction
Ratio
re
Optical Power
of a “1”
P1
Optical Power
of a “0”
P0
Signal
Amplitude
PIN
P= P0 + P1
AVE
() /2
r= 1 / P0
e
P
PP
r
AVE
e
12
1
=
+
PP
r
AVE
e
02
1
=+
()
/
PP
P
r
IN
AVE
e
=
()
+
10
2
1
OPTICAL
POWER
* Assuming a 50% average input data duty cycle (true for SONET/ATM data).
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