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參數(shù)資料
| 型號： | MAX3861ETG+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 0K |
| 描述： | IC AMP POST W/AGC 24-TQFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 后置放大器 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
IN+
IN-
50
VCC
VCC
OUT-
OUT+
50
Figure 2. Input Interface
Figure 3. Output Interface
MAX3861
Select the Coupling Capacitors
When AC-coupling is desired, select coupling capaci-
tors CIN and COUT to minimize the receiver’s determin-
istic jitter. Jitter is decreased as the input low-frequency
cutoff (fIN) is decreased.
For ATM/SONET or other applications using scrambled
NRZ data, select (CIN, COUT) ≥ 0.1F, which provides
fIN < 32kHz. For Fibre Channel, Gigabit Ethernet, and
other applications using 8B/10B data coding, select
(CIN, COUT) ≥ 0.01F, which provides fIN < 320kHz.
Setting the Offset-Cancellation Loop Time
Constant for Input Signal Detection
Circuitry (Selecting CCD)
The capacitor between CD+ and CD- determines the
time constant of the input signal detection DC offset-
cancellation loop. A value of 0.1F for CCD provides a
low-frequency cutoff (fC) below 10kHz. If a lower cutoff
frequency is desired, 0.22F gives fC = 4.5kHz and
0.47F gives fC = 2.1kHz. To guarantee stable opera-
tion, do not use a capacitor of less than 0.01F.
Setting the Offset-Cancellation Loop Time
Constant for the Main Signal Path
(Selecting CCZ)
The capacitor between CZ+ and CZ- determines the
time constant of the signal path DC offset-cancellation
loop. To maintain stability, keep a one-decade separa-
tion between fIN and the low-frequency cutoff (fOC)
associated with the DC offset-cancellation circuit. For
SONET applications, fIN < 32kHz, so fOCMAX < 3.2kHz.
Therefore, CCZ = 0.22F (fOC = 2.99kHz), CCZ =
0.47F (fOC = 1.4kHz), or a greater value can be used.
To guarantee stable operation, do not use a capacitor
of less than 0.01F.
Setting the Automatic Gain-Control Loop
Time Constant (Selecting CCG)
The automatic gain-control loop time constant is deter-
mined by the external capacitor connected between CG+
and CG-. Maxim recommends a value of at least
0.0022F.
Programming the Output Amplitude
(Programming the SC Pin)
Output amplitude can be programmed from 400mVP-P
to 920mVP-P by applying a voltage to the SC pin. See
the Output Signal Amplitude vs. SC Pin Voltage graph
in the Typical Operating Characteristics.
f
C
IN
=
()( )
[]
1
250
π
2.7Gbps Post Amp with Automatic Gain Control
8
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