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SA612AD
(Rev.:1997)

Double-balanced mixer and oscillator

Philips Electronics 

Philips Semiconductors

Double-balanced mixer and oscillator

Product specification

SA612A

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

VCC

TSTG

TA

Maximum operating voltage

Storage temperature

Operating ambient temperature range SA612A

RATING

9

-65 to +150

-40 to +85

UNIT

V

°C

°C

AC/DC ELECTRICAL CHARACTERISTICS

TA=25°C, VCC = 6V, Figure 3

SYMBOL

PARAMETER

VCC

fIN

fOSC

RIN

CIN

Power supply voltage range

DC current drain

Input signal frequency

Oscillator frequency

Noise figured at 45MHz

Third-order intercept point at 45MHz

Conversion gain at 45MHz

RF input resistance

RF input capacitance

Mixer output resistance

DESCRIPTION OF OPERATION

The SA612A is a Gilbert cell, an oscillator/buffer, and a temperature

compensated bias network as shown in the equivalent circuit. The

Gilbert cell is a differential amplifier (Pins 1 and 2) which drives a

balanced switching cell. The differential input stage provides gain

and determines the noise figure and signal handling performance of

the system.

The SA612A is designed for optimum low power performance.

When used with the SA614A as a 45MHz cordless phone/cellular

TEST CONDITION

RFIN=-45dBm

(Pin 4 or 5)

LIMITS

Min

Typ

Max

4.5

8.0

2.4

3.0

500

200

5.0

-13

14

17

1.5

3

1.5

UNIT

V

mA

MHz

MHz

dB

dBm

dB

kΩ

pF

kΩ

radio 2nd IF and demodulator, the SA612A is capable of receiving

-119dBm signals with a 12dB S/N ratio. Third-order intercept is

typically -15dBm (that’s approximately +5dBm output intercept

because of the RF gain). The system designer must be cognizant of

this large signal limitation. When designing LANs or other closed

systems where transmission levels are high, and small-signal or

signal-to-noise issues not critical, the input to the SA612A should be

appropriately scaled.

1997 Nov 07

3

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