MC44BC374EJB Freescale Semiconductor, MC44BC374EJB Datasheet - Page 14

• Manufacturer Part Number: MC44BC374EJB
• Description: IC MODULATOR ANT BOOSTER 24TSSOP
• Manufacturer: Freescale Semiconductor
• Type: Modulatorr

Specifications of MC44BC374EJB

• Applications: Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Modulator Operation
12 Modulator Operation
12.1 Power-ON Settings
At power-ON, the MC44BC373 and MC44BC374 configuration is as follows:
The settings indicated can be customized in the special masked version.
12.2 Power Supply
The five device Vcc pins (13, 15, 16, 21, 23) must be applied at the same time to ensure all internal blocks
are correctly biased. All other pins must not be biased before Vcc is applied to the device. The printed
circuit board layout of the Vcc supplies must be designed to ensure maximum isolation of the I/P to O/P
and also between the two O/Ps.
12.3 Standby Mode
During standby mode, the modulator is switched to low power consumption; the sound oscillator, UHF
oscillator, video and sound modulator sections bias are internally turned OFF.
The I
The modulator can be programmed in standby mode using a combination of three bits:
C1—High Order Bits
C0—Low Order Bits
FM—High Order Bits
FL—Low Order Bits
Note:
Note:
Note:
Note:
Note:
Note:
1. OSC=1
2. SO=1
3. ATT=1
2
C bus and booster sections remain active.
1. N0 to N11 are set to have the UHF oscillator on channel 36 (591.25MHz).
2. Peak White Clip is ON.
3. Sound frequency is 5.5MHz.
4. Sound auxiliary input is disabled.
5. Logic Output Port is low voltage.
6. Picture-to-sound ratio is 12dB.
WRITE MODE
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit 7
N5
MC44BC373/374 Technical Data
1
0
0
Go to: www.freescale.com
Bit 6
N4
0
0
0
Bit 5
N11
N3
0
0
Bit 4
N10
N2
0
0
Bit 3
N9
N1
0
1
Bit 2
N8
N0
0
0
Bit 1
N7
0
0
0
Bit 0
N6
0
0
0
ACK
ACK
ACK
ACK
ACK