Datasheet
Analog Integrated Circuit Device Data
Freescale Semiconductor 68
MC34708
Functional Block Description
noise injection must be avoided and filtering added, if necessary to ensure suitable PLL performance. The VPLL regulator has a
dedicated input supply pin.
VINPLL can be connected to either BP or a 1.8 V switched mode power supply rail such as from SW5 for the two lower set points
of each regulator VPLL[1:0] = [00], [01]. In addition, when the two upper set points (VPLL[1:0] = [10],[11]) are used, the VINPLL
inputs can be connected to either BP or a 2.2 V nominal external switched mode power supply rail, to improve power dissipation.
Table 56. VPLL Voltage Control
Parameter Value Function ILoad max Input Supply
VPLL[1:0] 00 output = 1.2 V 50 mA BP or 1.8 V
01 output = 1.25 V 50 mA BP or 1.8 V
10 output = 1.50 V 50 mA BP or External switch
11 output = 1.8 V 50 mA BP or External switch
Table 57. VPLL Electrical Specification
Characteristics noted under conditions BP = 3.6 V, V
BUS
= 5.0 V,- 40 C T
A
85 C, unless otherwise noted. Typical values at
BP = 3.6 V and T
A
= 25 °C under nominal conditions, unless otherwise noted.
Symbol Characteristic Min Typ Max Unit Notes
GENERAL
V
INPLL
Operating Input Voltage Range
• VPLL all settings, BP biased
• VPLL [1:0] = 00, 01 (SW5 = 1.8 V)
• VPLL, [1:0] = 10, 11, External Switch
UVDET
1.75
2.15
-
1.8
2.2
4.5
4.5
4.5
V
I
PLL
Operating current Load range
- - 50 mA
VPLL ACTIVE MODE – DC
V
PLL
Output Voltage V
OUT
•V
INMIN
< V
IN
< V
INMAX
,
•IL
MIN
< IL < IL
MAX
V
NOM
– 0.05
V
NOM
V
NOM
+ 0.05
V
V
PLL-LOPP
Load Regulation
•1.0 mA < IL < IL
MAX
For any V
INMIN
< V
IN
< V
INMAX
- 0.35 -
mV/mA
V
PLL-LIPP
Line Regulation
•V
INMIN
< V
IN
< V
INMAX
For any IL
MIN
< IL < IL
MAX
- 5.0 -
mV
I
PLL-Q
Quiescent Current
•V
INMIN
< V
IN
< V
INMAX
IL = 0
- 8.0 -
µA
VPLL ACTIVE MODE – AC
VPLL
PSRR
PSRR, IL = 75% of IL
MAX
, 20 Hz to 20 kHz
•V
IN
= UVDET
•V
IN
= V
NOM
+ 1.0 V, > UVDET
-
-
70
75
-
-
dB
t
ON-VPLL
Turn-on Time
• Enable to 90% of end value V
IN
= V
INMIN
, V
INMAX
IL = 0
- - 120
µs
t
OFF-VPLL
Turn-off Time
• Disable to 10% of initial value V
IN
= V
INMIN
, V
INMAX
, IL = 0
0.05 - 10
ms
VPLL
OS-
START
Start-up Overshoot
•V
IN
= V
INMIN
, V
INMAX
IL = 0
- 1.0 2.0
%