Ic1301 (Vhinjm2750M-1Y); Ic1401 (Vhism5309Av-1Y) - Sharp LC-32D44E Service Manual

Pin No.
26
Power supply
19, 24, 31, 38, 45, 51, 55, 62
22, 28, 34, 41, 50, 56, 63

2. IC1301 (VHINJM2750M-1Y)

The NJM2750 is a 4-input/1-output stereo audio selector. It contains a switch operational amplifier and shows lower noise, lower distortion and higher
channel separation than an ordinary multiplexer or analog switch.
Description:
• Operating voltage (4.7 - 13V)
• 4-input/1-output audio selector
• Stereo 2-channel
• Low output noise (-110dBV typ.)
• Low distortion (0.005% typ.)
Pin No. Pin Name
1 IN1a
2 CNT1
3 IN2a
4 CNT2
5 IN4a
6 IN1b
7 IN2b
8 IN4b
9 IN3b
10 (N.C)
11 OUTb
12 Vref
13 IN3a
14 V+
15 OUTa
16 GND

3. IC1401 (VHISM5309AV-1Y)

The SM5309A is a 3ch video buffer with a built-in 5th-order low pass filter. The cutoff frequency of the low pass filter can be adjusted between 4MHz
and 40MHz in 256 steps. The low pass filter supports analog inputs/outputs of video signal device of 480i to 1080i format. When it is used as an input
system, it functions as an antialiasing filter of the rear-stage ADC system. If used as an output system, aliasing noise from the video DAC or exoge-
nous noise is eliminated, and the terminating resistance of up to 300Ω can be driven. The cutoff frequency or signal input method can be controlled by
I2C-BUS.
Description:
• Supply voltage: Analog: 4.75 - 5.25V
Digital: 3.0 - 5.5V
• Low pass filter function where cutoff frequency can be adjusted in 256 steps
Cutoff frequency range: 4MHz - 40MHz (RISET = 1.8kΩ)
• Filter bypath mode function supporting the resolution of SXGA
• Switchable to the half fc mode suitable for the component signal (CH-2, CH-3)
• 2-input multiplexer function (switchable by the I2C-BUS or MUXSEL terminal)
• For the video input terminal, the sync-tip clamp/bias/direct input can be selected per channel.
• Possible to drive the terminating resistance of up to 300Ω
• Output gain: 0dB
• Power down function
– Consumption current at power down: 1mA or less
• Control by I2C-BUS interface
– Transfer rate: First mode (400kbit/s) supported
Pin No. Pin Name
1 IN1A
2 IN1B
3 GND
4 ISET
Pin Name I/O
CS1 I Chip select MSB
VDD_1V0 --- Digital core supply (1.0 V)
VDD_3V3 --- Digital I/O supply (3.3 V)
I/O
I A-ch input selector 1.
I control 1.
I A-ch input selector 2.
I control 2.
I A-ch input selector 4.
I B-ch input selector 1.
I B-ch input selector 2.
I B-ch input selector 4.
I B-ch input selector 3.
--- No connection.
O B-ch output.
I Reference voltage.
I Ach input selector 3.
--- Power supply.
O A-ch output.
--- Ground.
I/O
I Video signal input terminal (CH-1, A input)
I Video signal input terminal (CH-1, B input)
--- Ground.
--- Resister (RISET) connection terminal for internal current setting.
5 – 2
LC32D44E/S/RU-BK/GY (1st Eddition)
Pin Function
Pin Function
Pin Function