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参数资料
| 型号： | ADN2531ACPZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 11.3GBPS 16LFCSP |
| 标准包装： | 1 |
| 类型： | 激光二极管驱动器 |
| 数据速率： | 11.3Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 36mA |
| 电流 - 调制： | 80mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 安装类型： | 表面贴装 |
| 其它名称： | ADN2531ACPZ-R2DKR |
Data Sheet
The equivalent circuits for the MSET, IMODP, and IMODN pins
are shown in Figure 32 and Figure 33. The two 50 ? resistors in
200
190
180
170
ADN2531
V CC
V CC
160
150
MAXIMUM
140
MSET
400?
200?
130
120
110
100
90
TYPICAL
MINIMUM
Figure 32. Equivalent Circuit of the MSET Pin
80
70
60
V CC
IMODN
IMODP
V CC
50
50?
50?
0
10
20 30 40
DIFFERENTIAL R LOAD (?)
50
60
Figure 35. MSET Voltage to Modulation Current Ratio vs.
7.7?
7.7?
Differential Load Resistance
Using the resistance of the TOSA, the user can calculate the
voltage range that should be applied to the MSET pin to
Figure 33. Equivalent Circuit of the IMODP and IMODN Pins
The recommended configuration of the MSET, IMODP, and
IMODN pins is shown in Figure 34. See Table 6 for recom-
mended components. When the voltage on DATAP is greater
than the voltage on DATAN, the modulation current flows into
the IMODP pin and out of the IMODN pin, generating an
optical Logic 1 level at the TOSA output when the TOSA is
IBIAS
V CC
generate the required modulation current range (see the
example in the Applications Information section).
The circuit used to drive the MSET voltage must be able to
drive the 600 ? resistance of the MSET pin. To be able to drive
80 mA modulation currents through the differential load, the
output stage of the ADN2531 (IMODP and IMODN pins) must
be ac-coupled to the load. The voltages at these pins have a dc
component equal to V CC and an ac component with single-ended
peak-to-peak amplitude of I MOD × 50 ?. This is the case when the
load impedance (R TOSA ) is less than 100 ? differential because
the transmission line characteristic impedance sets the peak-to-
ADN2531
IMODP
L
Z 0 = 25?
C
Z 0 = 25?
L
peak amplitude. For the case where R TOSA is greater than 100 ?,
the single-ended, peak-to-peak amplitude is I MOD × R TOSA ÷ 2.
For proper operation of the output stage, the voltages at the
V MSET
MSET
IMODN
GND
Z L = 100?
Z 0 = 25?
L
C
Z 0 = 25?
L
FP/DFB
TOSA
IMODP and IMODN pins must be between the compliance
voltage specifications for this pin over supply, temperature, and
modulation current range, as shown in Figure 36. See the
Headroom Calculations section for examples of headroom
calculations.
V IMODP, V IMODN
V CC
Figure 34. Recommended Configuration for the
MSET, IMODP, and IMODN Pins
V CC
The ratio between the voltage applied to the MSET pin and the
differential modulation current available at the IMODP and
V CC + 1.1V
IMODN pins is a function of the load resistance value, as shown
V CC
NORMAL OPERATION REGION
V CC – 1.1V
Figure 36. Allowable Range for the Voltage at IMODP and IMODN
Rev. A | Page 13 of 20
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