beautypg.com

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

Page 34

background image

34

4596A–RKE–05/06

ATA5745/ATA5746 [Preliminary]

4

XTO

4.1

Transconductance XTO at
start

At startup; after startup
the amplitude is regulated
to V

PPXTAL

7,8

g

m, XTO

20

mS

B

4.2

XTO start-up time

C

0

≤ 2.2 pF

C

m

< 14 fF

R

m

≤ 120Ω

7,8

T

XTO_Startup

300

800

µs

A

4.3

Maximum C

0

of XTAL

7,8

C

0max

3.8

pF

D

4.4

Pulling of LO frequency
f

LO

due to XTO, C

L1

and

C

L2

versus temperature

and supply changes

1.0 pF

≤ C

0

≤ 2.2 pF

C

m

= 4.0 fF to 7.0 fF

R

m

≤ 120Ω

3

∆f

XTO

–5

+5

ppm

C

4.5

Amplitude XTAL after
startup

C

m

= 5 fF, C

0

= 1.8 pF

R

m

= 15Ω

V(XTAL1, XTAL2)
peak-to-peak value

7,8

V

PPXTAL

700

mVpp

C

V(XTAL1)
peak-to-peak value

7,8

V

PPXTAL

350

mVpp

C

4.6

Maximum series
resistance R

m

of XTAL at

startup

C

0

≤ 2.2 pF, small signal

start impedance, this
value is important for
crystal oscillator startup

7,8

Z

XTAL12_START

–1400

–2000

B

4.7

Maximum series
resistance R

m

of XTAL

after startup

C

0

≤ 2.2 pF

C

m

< 14 fF

7,8

R

m_max

15

120

B

4.8

Nominal XTAL load
resonant frequency

f

RF

= 433.92 MHz

f

RF

= 315 MHz

7,8

f

XTAL

13.57375

13.1433

MHz

D

4.9

External CLK_OUT
frequency

CLK_OUT_CRTL1 = 0
CLK_OUT_CTRL0 = 0
--> CLK_OUT disabled

3

f

CLK_OUT

f

CLK

disabled (low level on pin

CLK_OUT)

MHz

A

CLK_OUT_CRTL1 = 0
CLK_OUT_CTRL0 = 1
--> division ratio = 3

CLK_OUT_CRTL1 = 1
CLK_OUT_CTRL0 = 0
--> division ratio = 6

CLK_OUT_CRTL1 = 1
CLK_OUT_CTRL0 = 1
--> division ratio = 12

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

).

f

CLK

f

XTO

3

-----------

=

f

CLK

f

XTO

6

-----------

=

f

CLK

f

XTO

12

-----------

=