Motorola Master Selection Guide Analog and Interface Integrated Circuits4.8–15
Video Circuits (continued)
PLL Tuning Circuit with 3–Wire Bus
MC44827DTB, BDTB
Case 948F
The MC44827 is a tuning circuit for TV and VCR tuner
applications. This device contains on one chip all the functions
required for PLL control of a VCO. This integrated circuit also
contains a high frequency prescaler and thus can handle
frequencies up to 1.3 GHz.
The MC44827 is controlled by a 3–wire bus. It has the
same function as the MC44828 which is I2C bus controlled.
The MC44827 and MC44828 can replace each other to allow
conversion between 3–wire bus and I2C bus control.
The MC44827 is manufactured on a single silicon chip
using Motorola’s high density bipolar process, MOSAIC
(Motorola Oxide Self Aligned Implanted Circuits).
The MC44827 has the same features as MC44817 with the
following dif ferences:
•Lower Power Consumption, 200 mW Typical
•Improved Prescaler with Higher Margins for Sensitivity
and Temperature Range. (A typical device is functional in
a temperature range greater than –40 to 100°C.)
•Lock Detector with Push–Pull Output
•No Bypass of Divide–by–8 Prescaler
•TSSOP Package
PLL Tuning Circuit with I2C Bus
MC44828DTB
Case 948F
The MC44828 is a tuning circuit for TV and VCR tuner
applications. This device contains on one chip all the functions
required for PLL control of a VCO. This integrated circuit also
contains a high frequency prescaler and thus can handle
frequencies up to 1.3 GHz.
The MC44828 is controlled by an I2C bus. It has the same
function as the MC44827 which is 3–wire bus controlled. The
MC44827 and MC44828 can replace each other to allow
conversion between 3–wire bus and I2C bus control.
The MC44828 is manufactured on a single silicon chip
using Motorola’s high density bipolar process, MOSAIC
(Motorola Oxide Self Aligned Implanted Circuits).
The MC44828 has the same features as MC44818 with the
following dif ferences:
•Lower Power Consumption, 200 mW Typical
•Improved Prescaler with Higher Margins for Sensitivity
and Temperature Range. (A typical device is functional in
a temperature range greater than –40 to 100°C.)
•Lock Detector with Push–Pull Output
•TSSOP Package
PLL Tuning Circuit with DC/DC Converter and I2C Bus
MC44871DTB
Case 948F
The MC44871 is a tuning circuit for TV, VCR and
Multimedia tuner applications. This device contains on one
chip all the functions required for PLL control of a VCO. This
integrated circuit also contains a high frequency prescaler and
therefore can handle frequencies up to 1.3 GHz.
The MC44871 has an integrated dc/dc converter to
generate the 30 V supply voltage for the tuning amplifier on the
chip. A tuner using the MC44871 does not need an external
30 V supply.
The MC44871 is controlled by a I2C bus, and has a chip
address function. The MC44871 data format is the same as
the MC44818/MC44828.
The MC44871 is manufactured on a single silicon chip
using Motorola’s high density bipolar process, MOSAIC
(Motorola Oxide Self Aligned Implanted Circuits).
The differences compared with the MC44828 are
described hereafter:
•The Pin Called VCC2 for the MC44828 is Now Called CP
(Charge Pump). This Pin is the Output of the dc/dc
Converter; it Only Needs an External Capacitor (1.0 nF)
Instead of the 30 V Supply Line
•High Speed I2C Bus (500 kHz)
•I2C Bus Read Mode for Lock Detector and A to D
Converters
•HF Input is Symmetric
•MC44871 has Three PNP High Current (30 mA) Band
Buffers (B0, B1, B2) and One NPN Low Current (5.0 mA)
Band Buffer (B4)
•The Tuning Voltage Pin Needs an External pull–up
Resistor (560 kΩ)
•Phase Comparator Output Current Has Been Decreased