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| 型号： | ADN2847ACPZ-32 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 3.3GBPS 3.6V 32LFCSP |
| 标准包装： | 1 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 3.3Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 50mA |
| 电流 - 调制： | 80mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
Data Sheet
REF CLOCK
20MHz TO 180MHz
ADN2847
CLKIN
9
AD9850/AD9851
AD9834
DDS
12
R SET
1.25mA TO 20mA
21
I OUT
50 ?
20
I OUT
50 ?
LP FILTER
(DC-COUPLED)
1/2
AD8602
10kHz TO 1MHz
0.125mA TO 2mA
BC550
500 ?
35 IDTONE
ADN2847
CONTROLLER
37.5μA TO 600μA
BC550
1/2
AD8602
50μA TO 800μA
1k ?
32
IMMON
1.3k ?
Figure 12. Application Circuit to Allow Fiber Identification Using the AD9850/AD9851
ALARM INTERFACES
The FAIL and DEGRADE outputs have an internal pull-up
resistor of 30 kΩ, used to pull the digital high value to V CC .
However, the alarm can be overdriven with an external resistor
allowing alarm interfacing to non-V CC levels. Non-V CC alarm
output levels must be below the V CC used for the ADN2847.
POWER CONSUMPTION
The ADN2847 die temperature must be kept below 125°C. Both
LFCSP packages have an exposed paddle that should be connected
in such a manner that is at the same potential as the ADN2847
ground pins. The θ JA for both packages is specified in the
calculated using
I CC = I CCMIN + 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
Thus, the maximum combination of I BIAS + I MOD must be
calculated, where:
I CCMIN = 50 mA (typical value of I CC provided in the
Specifications section)
AC coupling the driver to the laser diode removes this
headroom constraint.
Caution must be taken when choosing component values for
ac coupling (see Figure 15) to ensure that the time constants
(L/R and RC) are sufficiently long for the data rate and expected
number of consecutive identical digits (CIDs). Failure to do this
can lead to pattern dependent jitter and vertical eye closure.
For designs with low series resistance, or where external
components become impractical, the ADN2847 supports direct
connection to the laser diode (see Figure 14). In this case, care
must be taken to ensure that the voltage drop across the laser
diode does not violate the minimum compliance voltage on the
IMODP pin.
OPTICAL SUPERVISOR
The PSET and ERSET potentiometers can be replaced with a
dual-digital potentiometer, the ADN2850 (see Figure 13). The
ADN2850 provides an accurate digital control for the average
optical power and extinction ratio and ensures excellent
stability over temperature.
V CC
I BIAS = I MOD = 0
T DIE = die temperature
T AMBIENT = ambient temperature
V BIAS_PIN = voltage at I BIAS pin
Tx
V CC
ADN2850
SDI
IMPD
ADN2847
IMODP
I BIAS
V CC
V CC
R Z
V MODP_PIN = average voltage at IMODP pin
V MODN_PIN = average voltage at IMODN pin
LASER DIODE INTERFACING
Rx
CLK
CS
SDO
CLK
CS
DAC1
DAC2
PSET
ERSET
Many laser diodes designed for 2.5 Gbps operation are packaged
with an internal resistor to bring the effective impedance up to
25 Ω to minimize transmission line effects. In high current
applications, the voltage drop across this resistor combined
with the laser diode forward voltage makes direct connection
between the laser and the driver impractical in a 3 V system.
Rev. B | Page 11 of 16
DATAP
DATAN
IDTONE
Figure 13. Application Using the ADN2850 a Dual 10-Bit Digital
Potentiometer with an Extremely Low Temperature Coefficient
as an Optical Supervisor
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| ADN2847ACPZ-32-RL | 功能描述:IC LSR DRVR 3.3GBPS 3.6V 32LFCSP 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 |
| ADN2847ACPZ-32-RL7 | 功能描述:IC LSR DRVR 3.3GBPS 3.6V 32LFCSP 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 |
| ADN2847ACPZ-48 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADN2847CSURFC | 制造商:Analog Devices 功能描述: |
| ADN2848 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:ADN2848: 3V Dual Loop 50Mbps to 622Mbps Laser Diode Driver Data Sheet (Rev. 0. 1/03) |
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