NJM2559
Output Coupling Capacitor-less Video Amplifier
with Power Supply Short-circuit Protection
s
GENERAL DESCRIPTION
The
NJM2559
is a output coupling capacitor-less video amplifier
with power supply short-circuit protection.*
When the DC voltage is impressed to the output terminal, it
becomes a power saving mode, and IC is protected.
The NJM2559 is suitable for the video application at risk of power
supply short-circuit.
*DC coupling
s
PACKAGE OUTLINE
NJM2559RB1
s
FEATURES
q
Operating Voltage
4.5 to 5.5V
q
Output Coupling Capacitor-less (0.5V DC Output)
q
Power Supply Short-circuit Protection Circuit
q
Internal LPF
-32dB typ. at 19MHz
q
12dB Amplifier
q
75Ω Driver
q
Power-save Circuit
q
Bipolar Technology
q
Package Outline
TVSP8
s
PIN CONNECTION
1
2
3
4
8
7
6
5
1: NC
2: GND
3: REF
4: Vout
5: V+
6: Vin
7: Power save
8: NC
s
BLOCK DIAGRAM
VCC
GND
12dB
LPF
PS
75ΩDRV
IN
50Ω
75Ω
0.1u
OUT
75Ω
120Ω
120Ω
CLAMP
REF
REF
33uF
+
120Ω
120Ω
Ver.0
-1-
NJM2559
s
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
+
Supply Voltage
V
7.0
V
Output Terminal Voltage
Vo
13.5
Power Dissipation
P
D
580 *1
mW
Operating Temperature Range
Topr
-40 to +85
°C
Storage Temperature Range
Tstg
-40 to +150
°C
(Note) At on a board of EIA/JEDEC specification. (114.3 x 76.2 x 1.6mm Two layers, FR-4)
s
ELECTRICAL CHRACTERISTCS 1(
V =5V, RL= refer to test circuit, Ta=25°C)
PARAMETER
Operating Voltage
Supply Current
Supply Current
at Power Save Mode
Power Supply
Short-circuit Voltage
Output Terminal Voltage at
Power Supply Short-circuit
REF Terminal Voltage 1 at
Power Supply Short-circuit
REF Terminal Voltage 2 at
Power Supply Short-circuit
Maximum Output Level
Voltage Gain
Low Pass Filter
Characteristic
Differential Gain
Differential Phase
Output DC Voltage
SW Voltage High Level
SW Voltage Low Level
SYMBOL
Vopr
I
CC
Isave
VoDCIN
No signal
Power save mode
75Ω series resistance connection
TEST CONDITION
MIN.
4.5
-
-
-
-
1.2
0.8
2.2
11.9
-0.6
-
-
-
-
1.8
0
TYP.
5.0
9.0
40
-
-
1.5
1.1
2.5
12.3
-0.1
-32
0.5
1.5
0.5
-
-
MAX.
5.5
12.0
100
16
13.5
1.8
1.4
-
12.7
0.4
-22
-
-
0.65
+
V
0.3
UNIT
V
mA
uA
V
V
V
V
Vp-p
dB
dB
%
deg
V
V
+
VoutDCIN 75Ω series resistance connection
VthREF1
VthREF2
Vom
Gv
Gfy4.5M
Gfy19M
DG
DP
VoDC
VthPSH
VthPSL
Power supply short-circuit protection
OFF→ON
Power supply short-circuit protection
ON→OFF
f=100kHz, THD=1%, sin-signal
Vin=100kHz,0.5Vp-p, sin-signal
Vin=4.5MHz/100kHz, 0.5Vp-p
Vin=19MHz/100kHz, 0.5Vp-p
Vin=0.5Vp-p, 10step video signal,
RL=75Ω
Vin=0.5Vp-p, 10step video signal,
RL=75Ω
No signal
Power save terminal switch voltage
Power save terminal switch voltage
s
CONTROL TERMINAL
PARAMETER
R
E
F
STATUS
H
L
H
P o w e r
S a v e
L
OPEN
Power save: ON
Power save: OFF
Power save: OFF
Power save: ON
Power save: ON
MODE
Non-Active mode (Mute)
Active mode (Mute)
Active mode
Non-Active mode (Mute)
Non-Active mode (Mute)
Ver.0
-2-
NJM2559
s
TEST CIRCUIT
1
NC
NC
8
2
GND
Power
Save
7
3
REF
VIN
6
0.1uF
75Ω
75Ω
4
75Ω
120Ω
120Ω
120Ω
VOUT
V+
5
10uF
0.1uF
33uF
+
120Ω
s
APPLICATION
Please connect the capacitor of power supply terminal (pin 5) near IC.
DC coupling is recommended. Please do not connect the output coupling capacitor.
External resistance must use power dissipation :125mW or more.
When 120Ω x3 are replaced with 360Ω, 400mW or more is recommended.
Ver.0
-3-
NJM2559
s
APPLICATION CIRCUIT:
Power Supply Short-circuit for 18Vmax)
1
NC
NC
8
2
GND
Power
Save
7
3
REF
VIN
6
0.1uF
75Ω
75Ω
4
75Ω
500Ω
360Ω
VOUT
V+
5
10uF
0.1uF
33uF
+
120Ω
s
APPLICATION
Please connect the capacitor of power supply terminal (pin 5) near IC.
DC coupling is recommended. Please do not connect the output coupling capacitor.
The power dissipation of external resistance is as follows.
When the power supply short-circuit voltage is 18Vmax, the current that flows to each resistance is as follows.
- 75Ω (series resistance): about 60mA
- 360Ω,120Ω (power supply short-circuit detection resistance): about 30mA
- 500Ω(pull-down resistance): about 30mA
The power dissipation recommendation value of each resistance is as follows.
- 75Ω (series resistance): 300mW or more
- 360Ω(power supply short-circuit detection resistance): 400mW or more
- 120Ω(power supply short-circuit detection resistance): 125mW or more
- 500Ω(pull-down resistance): 500mW or more
The load resistance of NJM2559 is about 93Ω in this application circuit.
Please use it more than 93Ω.
Moreover, supply current increases by 1mA when comparing with test circuit.
Ver.0
-4-
NJM2559
s
TYPICAL CHARACTERICS
V+ vs Icc
15
100
V+ vs Isave
75
10
Isave[uA]
Icc[mA]
50
5
25
0
4
4.5
5
V+ [V]
5.5
6
0
4
4.5
5
V+ [V]
5.5
6
V+ vs Protect Mode1
16
14
12
OUT1/VOUT1/REF1[V]
10
8
6
4
2
0
4
4.5
5
V+ [V]
5.5
6
OUT2/VOUT2/REF2[V]
OUT1
VOUT1
REF1
16
14
12
10
8
6
4
2
0
4
V+ vs Protect Mode2
OUT2
VOUT2
REF2
4.5
5
V+ [V]
5.5
6
Mode1: Power supply short-circuit protection OFF→ON
→
The voltage is applied to OUT from 0V in the step of +0.1V.
Each voltage when the voltage of VIN began to fall
on Low is measured.
Mode2: Power supply short-circuit protection ON→OFF
→
The voltage is applied to OUT from 16V in the step of -0.1V.
Each voltage when the voltage of VIN becomes 1.4V is measured.
Power supply short-circuit protection
internal impedance: about 4kΩ
V
+
Iout
OUT1
OUT2
OFF
GND
VOUT1
VOUT2
120Ω
120Ω
75Ω
to REF
REF1
REF2
120Ω
120Ω
Ver.0
-5-
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