CX74001

Rx ASIC for CDMA, AMPS, and PCS Applications

12

Skyworks

101134A

Proprietary Information and Specifications are Subject to Change

March 5, 2002

Table 8. Logic Control for LNA Gain Step

LNA_CTRL0

LNA_CTRL1

AMPS

CELL CDMA

PCS CDMA

0

0

HIGH

HIGH

HIGH

1

0

MEDIUM (Note 1)

MEDIUM

BYPASS

0

1

BYPASS (Note 1)

BYPASS

HIGH

1

1

BYPASS (Note 1)

BYPASS

BYPASS

Key: 0 = Low, OFF

1 = High, ON

X = Do not care

Note 1: These modes are available but not used to meet the IS-98 Specifications.

8

9

10

11

12

13

14

15

16

17

18

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

3.5

Vcc (V)

-30 deg C

25 deg C

85 deg C

Figure 3. PCS LNA Gain at 1960 MHz

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

3.5

Vcc (V)

-30 deg C

25 deg C

85 deg C

Figure 5. PCS LNA IIP3 at 1960 MHz

0

0.5

1

1.5

2

2.5

3

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

3.5

Vcc (V)

-30 deg C

25 deg C

85 deg C

Figure 4. PCS LNA NF at 1960 MHz

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

3.5

Vcc (V)

-30 deg C

25 deg C

85 deg C

Figure 6. PCS LNA Gain at 1960 MHz(Bypass Mode)