AD9662ARQZ-REEL7 Analog Devices Inc, AD9662ARQZ-REEL7 Datasheet - Page 11

IC LASER DIODE DRIVER 3CH 16QSOP

AD9662ARQZ-REEL7

Manufacturer Part Number
AD9662ARQZ-REEL7
Description
IC LASER DIODE DRIVER 3CH 16QSOP
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (CD/DVD)r
Datasheet

Specifications of AD9662ARQZ-REEL7

Number Of Channels
3
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Package / Case
16-LSSOP (0.154", 3.91mm Width)
Mounting Type
Surface Mount
Operating Supply Voltage (max)
5.5V
Operating Temperature (min)
0C
Mounting
Surface Mount
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
AD9662ARQZ-REEL7
AD9662ARQZ-REEL7TR
The change in junction temperature can then be determined.
This 2-point measurement allows the rise in die temperature to
be calculated for any given power dissipation. The θ
system can be calculated using the power dissipation of the LDD.
Figure 16 shows a graph of the measured voltage between ENR
and V
constructed using a 2-layer evaluation board for the AD9662
(see Figure 17).
T
P
θ
10V
5V
JA
CC
D
J
= T1 + ΔV
= V
= (T
(V
Figure 15. Junction Temperature Measurement Circuit
ENR
CC
J
– T1)/P
× I
1M Ω
− V
CC
V1, V2
BE
+
CC
– V
/(1.9 mV/°C)
) vs. the die temperature. This graph was
D
ENR
V
DIODE
CC
× I
DIODE
R
S
I
CC
AD9662
I
BE
JA
of the
Rev. C | Page 11 of 16
Using the preceding method, actual data was taken to
determine the θ
Immediately after power-up, V1 was measured to be 593 mV.
The supply current was 27 mA. The AD9662 was adjusted to
deliver 200 mA into a 10 Ω load. This resulted in a total supply
current of 244 mA. After allowing the part to reach thermal
equilibrium, V2 measured 412 mV. The voltage drop across the
120 mΩ internal resistor due to the change in supply current
was then calculated.
This 26 mV internal voltage drop was then added to the
measured voltage reduction to determine the actual ΔV
The die temperature change measured 82.4°C. The output of
the AD9662 was at a voltage of 2 V. The part dissipated an
additional 600 mW of power (3 V × 200 mA). The θ
AD9962 mounted on its 2-layer board was calculated to be:
600 mW/82.4°C = 137°C/W.
(244 mA – 27 mA) × 120 mΩ = 26 mV
ΔV
0.7
0.6
0.5
0.4
0.3
0.2
0.1
BE
0
20
= (593 mV – 412 mV + 26 mV) = 207 mV
Figure 16. V
40
JA
of the AD9662 in the evaluation board.
60
ENR
TEMPERATURE (°C)
− V
CC
80
vs. Internal Temperature
100
120
140
AD9662
JA
for the
BE.
160

Related parts for AD9662ARQZ-REEL7