MOTOROLA MC100EL1648 Technical data

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The MC100EL1648 requires an external parallel tank circuit consisting of
the inductor (L) and capacitor (C). A varactor diode may be incorporated into
the tank circuit to provide a voltage variable input for the oscillator (VCO).
This device may also be used in many other applications requiring a fixed
frequency clock.

The MC100EL1648 is ideal in applications requiring a local oscillator.
Systems include electronic test equipment and digital high–speed
telecommunications.

The MC100EL1648 is based on the VCO circuit topology of the MC1648.
The MC100EL1648 has been realized utilizing Motorola’s MOSAIC III
advanced bipolar process technology which results in a design which can
operate at a much higher frequency than the MC1648 while utilizing half the
current.

The ECL output circuitry of the MC100EL1648 is not a traditional open
emitter output structure and instead has an on–chip termination resistor with
a nominal value of 500 ohms. This facilitates direct ac–coupling of the output
signal into a transmission line. Because of this output configuration, an
external pull–down resistor is not required to provide the output with a dc
current path. This output is intended to drive one ECL load. If the user
needs to fanout the signal, an ECL buffer such as the MC10EL16 Line
Receiver/Driver should be used.

NOTE: The MC100EL1648 is NOT useable as a crystal oscillator.

• Typical Operating Frequency Up to 1100 MHz

• Low–Power 20 mA at 5.0 Vdc Power Supply

• 8–Pin SOIC Package

• Phase Noise –90 dBc/Hz at 25 kHz Typical

LOW POWER

VOLTAGE CONTROLLED

OSCILLATOR

SEMICONDUCTOR

TECHNICAL DATA

8

1

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

PIN CONNECTIONS

V

GND

GND

AGC

6

5

8

ref

7

BLOCK DIAGRAM

(Typical Test Circuit)

0.1µF

V

in

51K

Ω

VCC = 4.5 to 5.5 V

0.01µF

reserves the right to change or discontinue this product without notice.

MOTOROLA RF/IF DEVICE DATA

0.1µF

7865

V

GND GND AGC

ref

TANK VCCV

100

µ

CCO

2134

F

OUT

0.1µF

* The 1200 Ω resistor
and the scope
termination impedance
constitute a 25:1
attenuator probe.

1200Ω*

0.1µF 0.01µF100µF

F

out

VCCO

1

2

3

4

TANK

V

V

CCO

OUT

CC

(Top View)

ORDERING INFORMATION

Operating

Device

MC100EL1648D TA = –40 to 85°C SO–8

 Motorola, Inc. 1999 Rev 0, 08/1999This document contains information on a product under development. Motorola

Temperature Range

Package

1

MAXIMUM RATINGS

Parameter

Power Supply Voltage, Pins 2, 3 V
Operating Temperature Range T
Storage Temperature Range T

NOTE: ESD data available upon request.

MC100EL1648

Symbol Value Unit

CC

A

stg

–0.5 to 7.0 Vdc

–40 to 85 °C

–65 to 150 °C

ELECTRICAL CHARACTERISTICS (V

Characteristic

Supply Current I
Output Level HIGH (1.0 MΩ Impedance) V
Output Level LOW (1.0 MΩ Impedance) V
CSR @ 25 kHz Offset, 1.0 Hz BW
CSR @ 1.0 MHz Offset, 1.0 Hz BW
SNR (Signal to Noise Ratio from Carrier) SNR – 40 – dB
Frequency Stability Supply Drift Fsts – 3.6 – KHz/mV

Second Harmonic (from Carrier) H2 – –25 – dBc

= 5.0 V; TA = –40 to 85°C, unless otherwise noted.)

CC

Symbol Min Typ Max Unit

CC

OH

OL

L

(f)

L

(f)

Thermal Drift Fstt – 0.1 – KHz/°C

– 19 25 mA

3.95 4.17 4.61 V

3.04 3.41 3.60 V
– –90 – dBc/Hz
– –120 – dBc/Hz

Figure 1. Circuit Schematic

V

CC

2

V

CCO

3

Q10Q11

GND

Q9

Q3 Q2

Q4

Q7 Q6

D1

Q5

D2

6

8

TANK

V

ref

Q8

1

7

GND

5

AGC

Q1

510

4

OUT

Ω

2

MOTOROLA RF/IF DEVICE DATA