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參數(shù)資料
| 型號： | M61880FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Laser-diode driver / controller |
| 中文描述： | 激光二極管驅(qū)動器/控制器 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 160K |
| 代理商： | M61880FP |
( / )
MITSUBISHI
<
DIGITAL ASSP
>
M61880FP
Laser-diode driver / controller
FUNCTION TABLE
Input
ENB
S/H
Vm,Vr
H
H
L
X
DATA
Switch condition
SW1
SW2
Tr1
Output
X
X
X
X
X
L
L
L
H
Vm < Vr
Vm > Vr
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
Fixed to "L"
High impedance state (hold)
High impedance state (hold)
Constant current sourcing (sample)
Constant current sinking (sample)
(2) APC Timing Chart
The following diagram is an APC timing chart, operation
of which is based on sample hold control signals.
Note that in the example it is assumed that the leak current
occurring at the C
H
pin under hold condition flows into
the M61880 (in the positive direction).
X : Don't care
7.Vcc and GND Pins
Pins related to the power supply function are Vcc1, Vcc2,
GND1, and GND2. The role of these pins in terms of the in-
ternal circuits are as follows.
Vcc1, GND1: connected to analog circuits
Vcc2, GND2: connected to digital circuits
In practical wiring, the following should be noted.
(1) Secure as much a width as possible for conductors and
avoid lengthy wiring.
(2) Allocate electrolytic capacitors for stable voltage near
Vcc1 and GND1.
(3) Allocate by-pass capacitors near Vcc2 and GND2.
Notes on the Wiring for Peripheral Components
Lay out peripheral components necessary for the M61880 to
operate in closest possible proximity to the M61880.
Calculation Method for Power Dissipation
The approximate power dissipation, P, of the M61880FP is
determined by the following equation.
P = Icc x Vcc + I(RO) x V(RO) + I(LD) x V(LD) where
V(RO):voltage at RO pin
V(LD): voltage at LD pin
I(RO): load current at RO pin
I(LD) : load current at LD pin
If, for example, Vcc = 5.25V, V(RO) = V(LD) = 2.5V, and I(RO)
= I(LD) = 100mA, power dissipation at times of turning laser
on and off will be as follows.
(1) Laser ON (DATA = "L" and Icc = 55mA)
PON = 55 x 5.25 + 0 + 100 x 2.5 = 538.8(mW)
(2) Laser OFF (DATA = "H" and Icc = 55mA)
POFF = 55 x 5.25 +0+100 x 2.5 = 538.8(mW)
An example of APC Timing Chart
DATA input
ENB input
S / H input
I
LD
sample
hold
Vcc
sample
hold
sample
Laser drive current
hold
4
11
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