TLC2943

HIGH-PERFORMANCE DUAL PHASE-LOCKED BUILDING BLOCK

SLAS249 – NOVEMBER 1999

11

POST OFFICE BOX 655303

VCO section

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

f(OSC)

Oscillation frequency

RBIAS = 2.4 kΩ ,

VCOIN = 1/2VDD

38

48

58

MHz

t(STB)

Time to stable oscillation

See Note 10

10

µs

tr

Output rise time

CL = 15 pF,

See Figure 5

3.3

10

ns

tf

Output fall time

CL = 15 pF,

See Figure 5

2

8

ns

f(DUTY)

Duty cycle

RBIAS = 2.4 kΩ ,

VCOIN = 1/2VDD

45%

50%

55%

f(TA)

Temperature coefficient of oscillation

frequency

RBIAS = 2.4 kΩ ,

Top = –20

°C to 75°C

VCOIN = 1/2VDD

0.03

%/

°C

f(VDD)

Supply voltage coefficient of oscillation

frequency supply

RBIAS = 2.4 kΩ ,

VDD = 2.85 V to 3.15 V

VCOIN = 1.5 V,

0.04

%/mV

NOTE 10: The time period to the stable VCO oscillation frequency after the VCO INHIBIT terminal is changed to a low level.

PFD section

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

fMAX

Maximum operating frequency

30

MHz

tPLZ

PFD output disable time from low level

20

40

ns

tPHZ

PFD output disable time from high level

See Figure 6 and Figure 7 and Table 5

18

40

ns

tPZL

PFD output enable time to low level

See Figure 6 and Figure 7, and Table 5

4.1

18

ns

tPZH

PFD output enable time to high level

4.8

18

ns

tr

Rise time

CL =15 pF

See Figure 6

3.1

9

ns

tf

Fall time

CL = 15 pF,

See Figure 6

1.5

9

ns