MC44871 Datasheet, PDF (1/12 Pages) Motorola, Inc – PLL TUNING CIRCUIT WITH HIGH SPEED I2C BUS AND 30 V TUNING SUPPLY

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Advance Information
PLL Tuning Circuit with DC-DC
Converter, I2C Bus and ADC
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 thus 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 require 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.
The MC44871 is manufactured on a single silicon chip using Motorola’s
high density bipolar process, MOSAIC™ (Motorola Oxide Self Aligned
Implanted Circuits).
• The Pin Called VCC2 for the MC44818 is Now Called CP (Charge
Pump). This Pin is the Output of the DC/DC Converter; a 1.0 nF
Capacitor Replaces the Need for an External 30 V Supply
• High Speed I2C Bus (up to 800 kHz)
• I2C Bus Read Mode for Lock Detector and AFC Level
• HF Input is Balanced
• MC44871 has Three PNP High Current (30 mA) Band Buffers (B0, B1,
B2) and One NPN Low Current (5.0 mA) Band Buffer (B4)
• VCC Internally Supplies PNP Band Buffers
• The Tuning Voltage is Generated Through an External Pull–Up
Resistor (750 kΩ)
• Less Phase Comparator Output Current
• Single 5.0 V Supply Operation
MOSAIC is a trademark of Motorola, Inc.
Device
MC44871DTB
ORDERING INFORMATION
Operating
Temperature Range
TA = –20° to +85°C
Package
TSSOP–16
MC44871
PLL TUNING CIRCUIT
WITH HIGH SPEED I2C BUS
AND 30 V TUNING SUPPLY
SEMICONDUCTOR
TECHNICAL DATA
16
1
DTB SUFFIX
PLASTIC PACKAGE
CASE 948F
(TSSOP–16)
PIN CONNECTIONS
(16 Pin TSSOP)
VTUN ₁
CP 2
HF1 3
HF2 4
Gnd 5
B2 6
B1 7
B0 8
16 ^{Amp In}
15 Xtal
14 SCL
13 SDA
12 ADD
11 VCC
10 ADC
9 B4
(Top View)
This document contains information on a new product. Specifications and information herein
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© Motorola, Inc. 1998
Rev 1
1