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参数资料
| 型号： | ADN2873ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 4.25GBPS 24LFCSP |
| 标准包装： | 1,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 31mA |
| 电流 - 调制： | 90mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
ADN2873
PHOTODIODE
V CC
PAVSET
ADN2873
Power consumption can be calculated as
I CC = I CC min + 0.3 I MOD
P = V CC × I CC + ( I BIAS × V BIAS_PIN ) + I MOD ( V MODP_PIN + V MODN_PIN )/2
T DIE = T AMBIENT + θ JA × P
MICROCONVERTER
ADC
INPUT
R
Thus, the maximum combination of I BIAS + I MOD must be
calculated, where:
Figure 34. Recommended Method of I MPD Measurement Across a
Sense Resistor in Resistor Setting Mode
LOOP BANDWIDTH SELECTION
To ensure that the ADN2873 control loop has sufficient
bandwidth, the average power loop capacitor (PAVCAP) is
calculated using the slope efficiency of the laser (watts/amps)
and the average power required.
with I BIAS = I MOD = 0.
T DIE is the die temperature.
V BIAS_PIN is the voltage at the IBIAS pin.
V MODP_PIN is the voltage at the IMODP pin.
V MODN_PIN is the voltage at the IMODN pin.
T AMBIENT is the ambient temperature.
AUTOMATIC LASER SHUTDOWN (T X _DISABLE)
For resistor setpoint control,
PAVCAP = 3 . 2 × 10 ? 6 ×
LI
P AV
(Farad)
ALS (T X _DISABLE) is an input that is used to shut down the
optical output of the transmitter. The ALS pin is pulled up
internally with a 6 kΩ resistor and conforms to SFP MSA
specifications. When ALS is logic high or when open, both the
PAVCAP = 1 . 28 × 10 ? 6 ×
For voltage setpoint control,
LI
(Farad)
P AV
where:
LI is the typical slope efficiency at 25°C of a batch of lasers that
P AV is the average power required (mW).
are used in a design (mW/mA).
LI can be calculated as
bias and modulation currents are turned off. If an alarm has
been triggered and the bias and modulation currents are turned
off, ALS can be brought high and then low to clear the alarm.
BIAS AND MODULATION MONITOR CURRENTS
IBMON and IMMON are current-controlled current sources
that mirror a ratio of the bias and modulation current. The
monitor bias current, IBMON, and the monitor modulation
current, IMMON, should both be connected to ground through
a resistor to provide a voltage proportional to the bias current
MOD
LI =
P1 ? P0
I
(mW/mA)
and modulation current, respectively. When using a micro-
controller, the voltage developed across these resistors can be
connected to two of the ADC channels, making a digital
V CC ? V IBIAS
where:
P1 is the optical power (mW) at the one level.
P0 is the optical power (mW) at the zero level.
The capacitor value equation is used to obtain a centered value
for the particular type of laser that is used in a design and an
average power setting. The laser LI can vary by a factor of 7
between different physical lasers of the same type and across
temperatures without the need to recalculate the PAVCAP value.
This capacitor is placed between the PAVCAP pin and ground.
It is important that the capacitor is a low leakage, multilayer
ceramic type with an insulation resistance greater than 100 GΩ
or a time constant of 1000 sec, whichever is less. Pick a standard
off-the-shelf capacitor value such that the actual capacitance is
within ±30% of the calculated value after the capacitor’s own
tolerance is taken into account.
POWER CONSUMPTION
The ADN2873 die temperature must be kept below 125°C. The
representation of the bias and modulation current available.
IBIAS PIN
The ADN2873 IBIAS pin has one on-chip, 800 Ω pull-up resistor.
The current sink from this resistor is V IBIAS dependent.
I UP = (mA)
0 . 8
where V IBIAS is the voltage measured at the IBIAS pin after setup
of one laser bias current, I BIAS .
Usually, when set up, a maximum laser bias current of 100 mA
results in a V IBIAS to about 1.2 V. In a worst-case scenario, V CC =
3.6 V, V IBIAS = 1.2 V, and I UP (the current bypass through the 800 Ω
resistor) ≤ 3 mA.
This on-chip resistor damps out the low frequency oscillation
observed from some inexpensive lasers. If the on-chip resistance
may be necessary.
LFCSP has an exposed paddle, which should be connected so
that it is at the same potential as the ADN2873 GND pins.
Rev. 0 | Page 16 of 20
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相关代理商/技术参数 |
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| ADN2873ACPZ-RL | 功能描述:IC LASER DRIVER 4.25GBPS 24LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 激光驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:激光二极管驱动器 数据速率:- 通道数:4 电源电压:3.3V 电流 - 电源:- 电流 - 调制:- 电流 - 偏置:- 工作温度:0°C ~ 70°C 封装/外壳:40-TQFN 裸露焊盘 供应商设备封装:40-TQFN EP 包装:托盘 安装类型:表面贴装 |
| ADN2873ACPZ-RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver |
| ADN2873XCPZ | 功能描述:IC LASER DRIVER CSP 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
| ADN2880 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier |
| ADN2880ACHIPS | 制造商:Analog Devices 功能描述:3.2 GBPS 3.3V LOW NOISE TIA |
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