Motorola MC44871DTB Datasheet



SEMICONDUCTOR

TECHNICAL DATA

PLL TUNING CIRCUIT

PIN CONNECTIONS

(16 Pin TSSOP)

Order this document by MC44871/D

116

15

14

13

12

11

10

9

2

3

4

5

6

7

8

V

TUN

CP

HF1

B2

B1

B0

Amp In

B4

DTB SUFFIX

PLASTIC PACKAGE

CASE 948F

(TSSOP–16)

16

1

HF2

Gnd

Xtal

SCL

SDA

ADD

V

CC

ADC

(Top View)

WITH HIGH SPEED I2C BUS

AND 30 V TUNING SUPPLY

1

MOTOROLA ANALOG IC DEVICE DATA

 

    
    

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 V

CC2

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 I

2

C Bus (up to 800 kHz)

• I

2

C 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)

• V

CC

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.

ORDERING INFORMATION

Device

Operating

Temperature Range

Package

MC44871DTB TA = –20° to +85°C TSSOP–16

This document contains information on a new product. Specifications and information herein
are subject to change without notice.

 Motorola, Inc. 1998 Rev 1

MC44871

2

MOTOROLA ANALOG IC DEVICE DATA

92

CP

687115.0 V

Figure 1. Representative Block Diagram

This device contains 3,204 active transistors.

Gnd

Test

Logic

Buffers

Latches

P–On
Reset

I2C Bus

Receiver

Latches

Phase
Comp

Ref

Divider

Latch Control

Program Divider

15 Bit

Latches B

Latches A

÷

8

Prescaler

Preamp

DTB2

POR

Operational

Amplifier

V

ref

DTB1

CLO
Data

RL

DTF

F

out

TDI

F

out

F

ref

T10, T11

T14

T13

4

6

15

1

F

out

F

ref

5

13

14

12

4

SDA

SCL

ADD

HF2

V

CC

V

TUN

Amp In

Xtal

B4 B2 B1 B0

DTS

512/1024

16

15

Shift Register

15 Bit

Approximate values of the external components for generation of the tuning voltage are:

C1 = 1.0 nF Charge Pump filter capacitor

R1 = 750 kΩ (560 kΩ minimum) Pull–up resistor

C4 = 330 pF V

TUN

filter capacitor
C2 = 47 nF, C3 = 22 nF, R2 = 39 kΩ Loop filter
These component values depend on the application.

ADC

10

ADC

3.2 or 4.0 MHz
Osc

3

HF1

C1

R1

C4

C3

R2

V

TUN

C2

Bands Out

DC/DC

Converter

MC44871

3

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS (Maximum ratings are those values beyond which

permanent damage to the device may occur. Exposure to those limits may also affect device
reliability; TA = 25°C, unless otherwise noted.)

Rating

Pin Value Unit

Power Supply Voltage (VCC) 11 6.0 V
Storage Temperature – –65 to +150 °C
Operating Temperature Range – –20 to +85 °C
Operational Amplifier Output Voltage 1 40 V
RF Input Level 80 MHz to 1.3 GHz 3, 4 1.5 Vrms
NPN Band Buffer ”Off” Voltage 9 10 V
NPN Band Buffer ”On” Current 9 15 mA
PNP Band Buffer “Off” V oltage 6, 7, 8 6.0 V
PNP Band Buffer “On” Current 6, 7, 8 50 mA
PNP Band Buffer – Short Circuit Duration (Note 1) 6, 7, 8 Continuous –
Band Buffer Operation at 40 mA 6, 7, 8 10 s

all PNP Buffers “On”

NOTES: 1. At VCC = 5.0 V and TA = –20° to +80°C one buffer “On” only.

2.ESD data available upon request.

ELECTRICAL CHARACTERISTICS (Parameter Type: A–100% Tested, B–100% Correlation T ested, C–Characterized on

Samples, D–Design Parameter, VCC = 5.0 V , TA = 25°C, unless otherwise specified, 750 kΩ pull–up resistor between CP [Pin2] and
V

TUN

[Pin 1].)

Characteristic

Pin Min Typ Max Unit Type

VCC Supply Voltage Range 11 4.5 5.0 5.5 V A
VCC Supply Current (All Buffers “Off”)

– 35 45

A
One Buffer “On” when Open 11 – 40 50 mA B
One Buffer “On” at 40 mA – 80 90 B

PNP Band Buffer B0, B1, B2 Leakage Current when “Off” 6, 7, 8 – 0.01 1.0 µA A
PNP Band Buffer B0, B1, B2 Saturation Voltage when “On” at 30 mA 6, 7, 8 – 200 500 mV B
NPN Band Buffer B4 Leakage Current when “Off” 9 – 0.01 1.0 µA A
NPN Band Buffer ”Off” Voltage 9 0 – 5.5 V D
NPN Band Buffer B4 Saturation Voltage when “On” at 1.0 µA 9 – 50 100 mV A
NPN Band Buffer B4 Voltage when ”On” @ 5.0 mA 9 – 1.2 1.6 V A
Reference Oscillator Frequency Range 15 3.15 3.2 4.05 MHz D
Phase Comparator 3–State Current 16 –15 0 15 nA A
Phase Comparator Output Current – High Value 16 12 20 28 µA A
Phase Comparator Output Current – Low Value 16 2.0 6.0 10 µA A
DC–DC Converter Output Voltage, Sourcing 50 µA 2 28 31 34.5 V A
DC–DC Converter Maximum Current, Output Short Circuited 2 – 200 350 µA A
DC–DC Converter setting time from VCC >4.5 V to DC–DC Converter

Voltage > 28 V @ Load = 750 kΩ/1.0 nF

2 – – 25 ms C

Operational Amplifier Internal Reference Voltage (V

ref

) – 1.3 1.9 2.5 V A
Operational Amplifier Input Current 16 –15 0 15 nA A
Operational Amplifier DC Open Loop Gain – 100 300 – – A
Operational Amplifier Gain Bandwidth Product (CL = 1.0 nF) – 0.3 – – MHz D
Operational Amplifier Low Output Voltage, Sinking 50 µA 16 – 0.2 0.4 V D
Oscillator – Negative Resistance 15 1.0 – – kΩ D

MC44871

4

MOTOROLA ANALOG IC DEVICE DATA

PIN FUNCTION DESCRIPTION (see Figure 1)

Pin Symbol Description

1 V

TUN

Operational amplifier output which provides the tuning voltage

2 CP DC–DC Converter output (Charge Pump)

3, 4 HF1, HF2 Symmetrical HF inputs

5 Gnd Ground

6, 7, 8 B2, B1, B0 PNP Band Buffer outputs

9 B4 NPN Band Buffer output
10 ADC Three bit ADC for Automatic Frequency Tuning, readable through the bus
11 V

CC

Positive supply of the circuit (5.0 V)
12 ADD Chip address function
13 SDA I2C bus Data Input/Output
14 SCL I2C bus Clock
15 Xtal Crystal Oscillator (3.2 MHz or 4.0 MHz)
16 Amp In Operational amplifier input

HF INPUT SENSITIVITY AND OVERLOAD CHARACTERISTICS (V

CC

= 5.0 V , TA = 25°C.) (See Figure 2.)

Characteristics

Pin Min Typ Max Unit Type

DC Bias (Internal) 3, 4 – 1.6 – V A

80–150 MHz 3, 4 10 – 315 mVrms C
150–600 MHz 3, 4 5.0 – 315 mVrms C
600–950 MHz 3, 4 10 – 315 mVrms C
950–1300 MHz 3, 4 50 – 315 mVrms C

50 Ω Cable

Figure 2. HF Sensitivity Test Circuit

NOTE: 1.Device is in test mode. B1, B2 are “On” and B0, B4 are “Off”.

Sensitivity is level of HF generator on 50 Ω load.

13 14

HF13Gnd5B08B17B26B4

9

Bus Controller

HF Generator
HF Out Gnd

11VCC = 5.0 V

Counter
In

Bus

1.0 k

Ω

50

Ω

1.0 nF

MC44871

4

1.0 nF

1.0 k

Ω

1.0 k

Ω

Guaranteed Sensitivity Performance

RF LEVEL (dBm)

FREQUENCY (MHz)

Figure 3. Typical HF Sensitivity Performance

(VCC = 5.0 V, Temperature = 25°C)

10

0
–10
–20
–30
–40
–50
–60

0 200 400 600 800 1000 1200 1400