MC44BC374EJB Freescale Semiconductor, MC44BC374EJB Datasheet - Page 15

• 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

12.4 Test Bit TB1
This test bit allows an initial evaluation of MC44BC373 and MC44BC374 using software developed for
MC443535:
12.5 System L or B / G Selection
SYSL bit internally switches the following functions:
12.6 Transient Output Inhibit
To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the
desired frequency, the Sound and Video modulators are turned OFF for each of the following two cases:
CA-CHIP ADDRESS
C1-High Order Bits
C0-Low Order Bits
FM-High Order Bits
FL-Low Order Bits
Note:
Note:
Note:
PS = 0 is for picture-to-sound ratio = 12dB,
PS = 1 is for picture-to-sound ratio = 16dB
Note:
lets a sound frequency between 4.5MHz, 5MHz, 5.5MHz, and 6.5MHz be selected.
Note:
selectable.
Note:
•
•
•
•
1. Power-ON from zero (i.e., all Vcc is switched from 0V to 5V).
2. UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 1 to 0)
1. Case TB1=1, compatible with MC44353
2. All “—” are don’t care bits.
3. PS bit replaces PSD2 bit in MC44353 bus format:
4. SFD1 and SFD0 bits have the same definition for both bus formats (MC44353 and MC44BC373/374) and
5. SYSL bit has same definition for bus formats MC44353 and MC44BC373/374; either system L or B/G is
6. All MC44BC373/374 functions are set to their default values.
TB1= 0 — All MC44BC373/374 functions available—normal mode.
TB1= 1 — Limited software compatibility with MC44353; MC44BC373/374 functions not
available.
SYSL = 0; enables B/G system
— Video modulation polarity—Negative
— Video modulation depth—80% Typical (See Video Characteristics on page 10.)
— Sound modulation type—FM
SYSL = 1; enables L system
— Video modulation polarity—Positive
— Video modulation depth—90% Typical (See Video Characteristics on page 10.)
— Sound modulation type—AM
WRITE MODE
1
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit 7
N5
—
MC44BC373/374 Technical Data
1
1
0
Go to: www.freescale.com
TPEN
Bit 6
N4
—
1
Bit 5
N11
N3
—
—
0
SFD1
Bit 4
N10
N2
—
0
SFD0
Bit 3
PS
N9
N1
1
Bit 2
N8
N0
—
0
1
Bit 1
Modulator Operation
N7
—
—
1
0
SYSL
Bit 0
N6
—
0
0
ACK
ACK
ACK
ACK
ACK
ACK