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参数资料
| 型号： | TZA3047BVH/C1,551 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 1.25GBPS 32-HBCC |
| 标准包装： | 490 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 1.25Gbps |
| 通道数： | 1 |
| 电源电压： | 3.14 V ~ 3.47 V |
| 电流 - 电源： | 40mA |
| 电流 - 调制： | 100mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-HBCC |
| 供应商设备封装： | 32-HBCC（5x5） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
| 其它名称： | 568-1189 935270561551 TZA3047BVHW-S |
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Philips Semiconductors
30 Mbits/s up to 1.25 Gbits/s laser drivers
Product speci?cation
TZA3047A; TZA3047B
7.5
Dual-loop control
7.9
Alarm functions
The TZA3047 incorporates a dual-loop control for a
constant, accurate and temperature-independent control
of the optical average power level and the extinction ratio.
The dual-loop guarantees constant optical ‘one’ and ‘zero’
levels which are independent of the laser temperature and
the laser age.
The dual-loop operates by monitoring the current of the
monitor photodiode which is directly proportional to the
laser emission. The ‘one’ and ‘zero’ current levels of the
The TZA3047 features two alarm functions for the
detection of excessive laser operating current and monitor
diode current due to laser ageing, laser malfunctioning or
a too high laser temperature. The alarm threshold levels
are programmed by a resistor or a current source. In the
TZA3047A, for the AC-coupled application, the operating
current is equal to the bias current. In the TZA3047B, for
the DC-coupled application, the operating current equals
the bias current plus half of the modulation current.
monitor diode are captured by the detector of the dual-loop
control. Pin MON for the monitor photodiode current is an
7.10
Enable
RF input.
The average monitor current is programmable over a wide
current range from 150 to 1300 μ A for both the dual-loop
control and the average loop control. The extinction ratio is
A LOW level on the enable input disables the bias and
modulation current sources: the laser is off. A HIGH level
on the enable input or an open enable input switches both
current sources on: the laser is operational.
programmable from 5 to 15.
7.11
Reference block
The maximum allowable capacitive load on pins AVR, ER,
BIASOUT and MODOUT is 100 pF.
The reference voltage is derived from a band gap circuit
and is available at pin RREF. An accurate (1%) 10 k ?
7.6
Average loop control
resistor has to be connected to pin RREF to provide the
internal reference current. The maximum capacitive load
The average power control loop maintains a constant
average power level of the monitor current over
temperature and lifetime of the laser. The average loop
control is activated by short-circuiting pin ER to ground.
on pin RREF is 100 pF.
The reference voltage on the setting pins (MAXOP,
MAXMON, PWA, ER and AVR) is buffered and derived
from the band gap voltage.
7.7
Direct current setting
The output voltage on pin VTEMP reflects the junction
The TZA3047 can also operate in open-loop mode with
direct setting of the bias and modulation currents. The bias
and modulation current sources are transconductance
amplifiers and the output currents are determined by the
BIASIN and MODIN voltages respectively. The bias
current source has a bipolar output stage with minimum
output capacitance for optimum RF performance.
temperature of the TZA3047, the temperature coefficient
of V VTEMP equals ? 2.2 mV/K.
7.8
Soft start
At power-up the bias and modulation current sources are
released when V CCA > 2.7 V and the reference voltage has
reached the correct value of 1.2 V.
The control loop starts with minimum bias and modulation
current at power-up and when the device is enabled. The
current levels increase until the MON input current
matches the programmed average level and, in the case
of dual-loop control, the extinction ratio.
2003 Jun 05
8
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相关代理商/技术参数 |
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