beautypg.com

Electrical characteristics: general (continued) – Rainbow Electronics ATA5746 User Manual

Page 32

background image

32

4596A–RKE–05/06

ATA5745/ATA5746 [Preliminary]

3.11 Intermediate frequency

f

RF

= 433.92 MHz

f

IF

440

kHz

A

f

RF

= 315 MHz

f

IF

440

kHz

A

3.12 System bandwidth

3 dB bandwidth
This value is for
information only!

Note that for crystal and
system frequency offset
calculations,

∆f

OFFSET

must be used.

(14)

SBW

435

kHz

A

3.13

System out-band
3rd-order input intercept
point

∆f

meas1

= 1.8 MHz

∆f

meas2

= 3.6 MHz

f

RF

= 315 MHz

(14)

IIP3

–24

dBm

C

f

RF

= 433.92 MHz

(14)

IIP3

–23

dBm

C

3.14

System outband input
1-dB compression point

∆f

meas1

= 1 MHz

f

RF

= 315 MHz

(14)

I1dBCP

–31

–36

dBm

C

f

RF

= 433.92 MHz

(14)

I1dBCP

–30

–35

dBm

C

3.15 LNA input impedance

f

RF

= 315 MHz

14

Z

in_LNA

(72.4 – j298)

C

f

RF

= 433.92 MHz

14

Z

in_LNA

(55 – j216)

C

3.16

Maximum peak RF input
level, ASK and FSK

BER < 10

3

, ASK: 100%

(14)

P

IN_max

+5

–10

dBm

C

FSK: f

DEV

= ±38 kHz

(14)

P

IN_max

+5

–10

dBm

C

3.17 LO spurs at LNA_IN

f < 1 GHz

(14)

–57

dBm

C

f >1 GHz

(14)

–47

dBm

C

f

LO

= 315.44 MHz

2

× f

LO

4

× f

LO

(14)

–90
–94
–68

dBm

C

f

LO

= 434.36 MHz

2

× f

LO

4

× f

LO

(14)

–92
–88
–58

dBm

C

3.18 Image rejection

With the complete image
band
f

RF

= 315 MHz

(14)

24

30

dB

A

f

RF

= 433.92 MHz

(14)

24

30

dB

A

3.19

Useful signal to interferer
ratio

Peak level of useful signal
to peak level of interferer
for BER < 10

3

with any

modulation scheme of
interferer

FSK BR_Ranges 0, 1, 2

(14)

SNR

FSK0-2

2

3

dB

B

FSK BR_Range_3

(14)

SNR

FSK3

4

6

dB

B

ASK (P

RF

< P

RFIN_High

)

(14)

SNR

ASK

10

14

dB

B

13. Electrical Characteristics: General (Continued)

All parameters refer to GND and are valid for T

amb

= –40°C to +105°C, V

VS3V_AVCC

= V

VS5V

= 2.7V to 3.3V, and V

VS5V

= 4.5V to 5.5V.

Typical values are given at V

VS3V_AVCC

= V

VS5V

= 3V, T

amb

= 25°C, and f

RF

= 315 MHz unless otherwise specified. Details about current

consumption, timing, and digital pin properties can be found in the specific sections of the “Electrical Characteristics”.

No. Parameters

Test Conditions

Pin

(1)

Symbol

Min.

Typ.

Max.

Unit

Type*

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

Note:

1. Pin numbers in parenthesis were measured with RF_IN matched to 50

Ω according to

Figure 2-1 on page 6

with component

values as in

Table 2-2 on page 6

(RF

IN

).