Philips Semiconductors

Product specification

NE/SA612A

Double-balanced mixer and oscillator

1990 Sep 17

2

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNIT

Maximum operating voltage

9

V

Storage temperature

-65 to +150

°C

Operating ambient temperature range

NE

SA

0 to +70

-40 to +85

°C

AC/DC ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

TEST CONDITION

LIMITS

UNIT

SYMBOL

PARAMETER

TEST CONDITION

Min

Typ

Max

UNIT

Power supply voltage range

4.5

8.0

V

DC current drain

2.4

3.0

mA

Input signal frequency

500

MHz

Oscillator frequency

200

MHz

Noise figured at 45MHz

5.0

dB

Third-order intercept point at 45MHz

-13

dBm

Conversion gain at 45MHz

14

17

dB

RF input resistance

1.5

k

Ω

RF input capacitance

3

pF

Mixer output resistance

(Pin 4 or 5)

1.5

k

Ω

DESCRIPTION OF OPERATION

The NE/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 NE/SA612A is designed for optimum low power performance.

When used with the NE614A as a 45MHz cordless phone/cellular

radio 2nd IF and demodulator, the NE/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

NE/SA612A should be appropriately scaled.