I
NTEGRATED
C
IRCUITS
D
IVISION
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2
R04
LIA120
Absolute Maximum Ratings are stress ratings. Stresses in
excess of these ratings can cause permanent damage to
the device. Functional operation of the device at conditions
beyond those indicated in the operational sections of this
data sheet is not implied.
Parameter Conditions Symbol Min Typ Max Units
Input Characteristics @ 25ºC
LED forward voltage I
LED
= 5 mA, V
COMP
= V
FB
(Fig.1) V
F
0.8 1.2 1.4 V
Reference voltage I
LED
= 10 mA, V
COMP
= V
FB
(Fig.1)
T
A
= -40 to +85°C
V
REF
1.210 - 1.265
V
T
A
= 25°C 1.228 1.24 1.252
Deviation of V
REF
over temperature - See Note 1 T
A
= -40 to +85°C V
REF (DEV)
-32 - mV
Transfer Characteristics @ 25ºC
Current Transfer Ratio in Feedback (I
REF
/I
LED
)I
LED
= 5mA, V
REF
= 0.5V (Fig.2) K
1
1.0 2 3.0 %
Current transfer ratio (I
KA
/I
LED
)I
LED
= 5 mA, V
COMP
= V
FB
, V
KA
= 5 V (Fig. 4) K
2
1.0 2 3.0 %
Current Transfer Ratio Matching (I
KA
/I
REF
)I
LED
= 5mA, V
KA
= 5.0V K
3
85 100 115 %
Feedback input current I
LED
= 10 mA, R1 = 10 kΩ (Fig.2) I
REF
- 226 - µA
Deviation of I
REF
over temperature - See Note 1 T
A
= -40 to +85°C I
REF (DEV)
- 110 - µA
Minimum drive current V
COMP
= V
FB
(Fig.1) I
LED (MIN)
1- -mA
Off-state error amplifier current V
IN
= 6 V, V
FB
= 0 (Fig.3) I
OFF
- 0.001 0.1 µA
Error amplifier output impedance - See Note 2 I
LED
= 0.1 mA to 15 mA, V
COMP
= V
FB
, f<1 kHz (Fig.1) IZ
OUT
I - 0.21 -
Output Characteristics @ 25ºC
Cathode dark current V
IN
= Open, V
KA
= 10V (Fig. 3) I
KAO
- 0.3 100 nA
Cathode-Anode voltage breakdown I
KA
= 1µA BV
KA
20 - - V
Isolation Characteristics @ 25ºC
Withstand insulation voltage RH ≤ 50%, T
A
= 25°C, t = 1 min (Note 3) V
ISO
3750 - - V
rms
Resistance (input to output) V
I-O
= 500 V
DC
(Note 3) R
I-O
-10
12
-
AC Characteristics @ 25ºC
Bandwidth (LED) - See Note 4 -B
W
- 100 - kHz
Common mode rejection ratio - See Note 5 I
LED
= 1.0 mA,
R
L
=100 kΩ, f=100 Hz (Fig. 5) CMRR - 70 - dB
Linearity I
LED
= 5 mA, 100 mV
PP
THD - 70 - dB
1. The deviation parameters V
REF(DEV)
and I
REF(DEV)
are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average
full-range temperature coefficient of the reference input voltage, ∆V
REF
, is defined as:
|∆V
REF
| (ppm/°C) = {V
REF (DEV)
/V
REF
(T
A
25°C)} X 10
6
/ ∆T
A
where ∆T
A
is the rated operating free-air temperature range of the device.
2. The dynamic impedance is defined as |Z
OUT
| = ∆V
COMP
/∆I
LED
, for the application circuit in Figure 6, |Zout| = K
1
R
1
3. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.
4. See compensation section for calculating bandwidth of LIA120.
5. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will
remain high. Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will
remain low.
Electrical Characteristics:
Parameter Symbol Ratings Units
Photodiode Cathode-Anode Voltage V
KAO
20 V
Photodiode Anode-Cathode Voltage V
AKO
0.5 V
Input Voltage V
LED
9V
Input DC Current I
LED
20 mA
Total Power Dissipation (note 1) P
D
145 mW
Operating Temperature T -40 to +85 ºC
Storage Temperature T -40 to +125 ºC
Absolute Maximum Ratings (@ 25ºC)
1
Derate linearly from 25°C at a rate of 2.42 mW/ °C.
