Philips Semiconductors

Product specification

SA621

1GHz low voltage LNA, mixer and VCO

2

1997 Nov 07

853-1849 018660

DESCRIPTION

The SA621 is a combined low-noise amplifier, mixer and VCO

designed for high-performance low-power communication systems

from 800-1000MHz. The low-noise preamplifier has a 1.7dB noise

figure at 881MHz with 15dB gain and an IP3 intercept of -7dBm at

the input. The gain is stabilized by on-chip compensation to vary

less than

±0.2dB over -40 to +85°C temperature range. The

wide-dynamic-range mixer has a 12dB noise figure and IP3 of

+4.5dBm at the input at 881MHz. The integrated VCO circuit with

external resonator produces a high quality LO signal that drives the

mixer and is buffered to an external PLL synthesizer IC. The

nominal current drawn from a single 3V supply is 13.3mA.

Additionally, the entire circuit can be powered down to further reduce

the supply current to less than 20

µA.

FEATURES

PIN CONFIGURATION

SR01429

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

19

18

17

16

15

GND

LNA OUT

VCC

LNA IN

GND

GND

MIXER IN

MIXER OUT

MIXER OUT

GND

GND

BYPASS

GND

TANK

GND

GND

LO OUT

PD2

PD1

GND

Figure 1. Pin Configuration

APPLICATIONS

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Thin Shrink Small Outline Package (Surface-mount, TSSOP)

-40 to +85

SA621DH

SOT360-1

BLOCK DIAGRAM

SR01428

4

3

2

15

20

19

18

17

16

7

610

9

8

15

14

13

12

11

LO

GND

BYPASS

GND

LNA

IN

GND

MIXER

IN

MIXER

OUT

MIXER

OUT

PD1

PD2

GND

LNA

OUT

GND

OUT

GND

TANK

LNA

GND

GND

GND

10pF

10pF

Figure 2. SA621 Block Diagram