AK4250 Datasheet PDF - Asahi Kasei Microsystems

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AK4250
Asahi Kasei Microsystems

Part Number AK4250
Description Output Coupling Capacitor-less Video Amp
Page 8 Pages


AK4250 datasheet pdf
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ASAHI KASEI
[AK4250]
AK4250
Output Coupling Capacitor-less Video Amp with LPF
GENERAL DESCRIPTION
The AK4250 is a Video Amp with LPF. The output coupling capacitor can be removed because the
AK4250 includes the negative power supply circuit. The AK4250 is housed in a space-saving 8-pin
USON package.
FEATURE
1. Video Function
A Composite Video Input
A Video-Amp (+6dB) for Composite Video Signal
Low Pass Filter
www.DataSheet4U.coCmharge pump circuit for negative power supply
2. Ta = -40 85 °C
3. Power Supply: 2.7 3.6V (typ. 3.0V)
4. Power Supply Current: 10 mA
5. Package: 8 pin USON
Block Diagram
PDN
VIN
VDD
Clamp
Charge
Pump
LPF
Clock
Generator
CP CN VSS
VEE
MS0540-E-00
Figure 1. AK4250 Block Diagram
-1-
VOUT
2007/03



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ASAHI KASEI
Ordering Guide
AK4250VU
AKD4250
Pin Layout
40 +85°C
8 pin USON (0.5mm pitch)
Evaluation board for AK4250
www.DataSheet4U.com
CP 1
VDD 2
VIN 3
PDN 4
Top
View
8 CN
7 VEE
6 VSS
5 VOUT
[AK4250]
MS0540-E-00
-2-
2007/03



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ASAHI KASEI
[AK4250]
No. Pin Name
1 CP
2 VDD
3 VIN
4 PDN
5 VOUT
6 VSS
7 VEE
8 CN
PIN/FUNCTION
I/O Function
O Positive Charge Pump Capacitor Terminal Pin
- Power Supply Pin.
I Composite Video Signal Input Pin
Power-Down Mode Pin. Internal Pull Down 100kΩ.
I H: Power up, L: Power down.
O Composite Video Signal Driver Pin
- Ground Pin
O Negative Voltage Output Pin for Video Amplifier
I Negative Charge Pump Capacitor Terminal Pin
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ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note1)
Parameter
Symbol
min
Power Supplies:
VDD
0.3
Input Current, Any Pin Except Supplies
IIN -
Input Voltage (Note 2)
VIN 0.3
Ambient Temperature (powered applied)
Ta 40
Storage Temperature
Tstg 65
max
4.0
±10
(VDD+0.3) or 4.0
85
150
Units
V
mA
V
°C
°C
Note 1. All voltages are with respect to ground.
Note 2. VIN, PDIN pins. Max is smaller value between (VDD+0.3)V and 4.0V
VOUT pin becomes Hi-Z at PDN pin = “L”. Therefore VOUT pin is available to signal line from another device
by Wired-OR. The input signal to VOUT pin mustn’t exceeds this input voltage range.
Any voltage must not be applied to the CN pin.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
(VSS=0V; Note1)
Parameter
Power Supplies
RECOMMENDED OPERATING CONDITIONS
Symbol
VDD
min typ
2.7 3.0
Note 1. All voltages with respect to ground.
* AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
max Units
3.6 V
MS0540-E-00
-3-
2007/03



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ASAHI KASEI
[AK4250]
ANALOG CHRACTERISTICS
(Ta=25°C; VDD =3.0V; VSS = 0V; unless otherwise specified)
Parameter
Conditions
min typ
max Units
V Input Characteristics
Input Voltage
- - 1.5 Vpp
Input Sync Chip Clamp Voltage (Note 3)
-0.386 -0.286 -0.186 V
V Output Characteristics (Note 4)
Output Gain
VIN=100kHz, 0.2Vpp
5.0 6.0 7.0 dB
Maximum output voltage
S/N
VIN=100kHz , THD=-30dB
BW=100kH 6MHz, (Note 5)
2.52 -
- 65
- Vpp
- dB
Secondary Distortion
VIN=3.58MHz, 0.2Vpp (Sin Wave)
- -45 - dB
Load Resistance
140 150
-
Ω
Load Capacitance
LPF
C1 (Figure 2)
C2 (Figure 2)
- - 15 pF
- - 400 pF
Frequency Response
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Input= 0.2Vpp, Sin Wave
(0dB at 100kHz)
Group Delay
Power Supplies
Response at 6.75MHz
Response at 27MHz
|GD3MHz - GD6MHz|
-3 -0.5
-
dB
- -40 -20 dB
- 10 100 nsec
Power Up
Black signal is output and no load
resistance.
-
10 15 mA
Power Down
PDN pin = 0V
- 1 20 μA
Note 3. The Charge Pump circuit doesn’t work well, if the sync chip clamp voltage input to VIN pin isn’t within this
voltage range. This sync chip clamp voltage is the voltage from the pedestal voltage
Note 4. The measurement point is the point A in Figure 2
Note 5. The reference signal is the 100% white signal.
Measurement Point A
Video Signal Output
C1
75 ohm
R1
C2
R2
75 ohm
Figure 2. Load Capacitance C1 and C2
(Ta=25°C; VDD=2.7 3.6V)
Parameter
High-Level Input Voltage
Low-Level Input Voltage
DC CHRACTERISTICS
(PDN pin)
(PDN pin)
Symbol
VIH
VIL
min
1.5
-
typ max Units
- -V
- 0.6 V
MS0540-E-00
-4-
2007/03



AK4250 datasheet pdf
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AK4250 pdf
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