LC-26D44E (serv.man6). Major IC Informations - Sharp TV Service Manual (repair manual). Page 2

LC-26D44E/S/RU-BK/GY

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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.)

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 300

Ω 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 = 1.8k

Ω)

• 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 300

Ω

• 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

26

CS1

I

Chip select MSB

Power supply
19, 24, 31, 38, 45, 51, 55, 62

VDD_1V0

---

Digital core supply (1.0 V)

22, 28, 34, 41, 50, 56, 63

VDD_3V3

---

Digital I/O supply (3.3 V)

1

IN1a

I

A-ch input selector 1.

2

CNT1

I

control 1.

3

IN2a

I

A-ch input selector 2.

4

CNT2

I

control 2.

5

IN4a

I

A-ch input selector 4.

6

IN1b

I

B-ch input selector 1.

7

IN2b

I

B-ch input selector 2.

8

IN4b

I

B-ch input selector 4.

9

IN3b

I

B-ch input selector 3.

10

(N.C)

---

No connection.

11

OUTb

O

B-ch output.

12

Vref

I

Reference voltage.

13

IN3a

I

Ach input selector 3.

14

V+

---

Power supply.

15

OUTa

O

A-ch output.

16

GND

---

Ground.

1

IN1A

I

Video signal input terminal (CH-1, A input)

2

IN1B

I

Video signal input terminal (CH-1, B input)

3

GND

---

Ground.

4

ISET

---

Resister (RISET) connection terminal for internal current setting.