BB814
Jul-05-20011
Silicon Variable Capacitance Diode
For FM radio tuners with extended frequency band
High tuning ratio at low supply voltage (car radio)
Monolithic chip (common cathode) for perfect
dual diode tracking
Coded capacitance groups and group matching
available
1
2
3
VPS05161
EHA07179
3
12
A1 A2
C1/C2
Type Marking Pin Configuration Package
BB814
BB814 SH1
SH2 1=A1
1=A1 2=A2
2=A2 3=C1/2
3=C1/2 SOT23
SOT23
Maximum Ratings
Unit
Parameter Symbol Value
VDiode reverse voltage 18
VR
Peak reverse voltage VRM 20 V
50
IFmAForward current
Top -55 ... 125Operating temperature range °C
Storage temperature Tst
g
-55 ... 150
BB814
Jul-05-20012
Electrical Characteristics at TA = 25°C, unless otherwise specified.
Parameter Values UnitSymbol
min. max.typ.
DC characteristics
IR- -Reverse current
VR = 16 V nA20
200-
IR-Reverse current
VR = 16 V, TA = 60 °C
AC characteristics
Diode capacitance
VR = 2 V, f = 1 MHz
VR = 8 V, f = 1 MHz
CT
46.5
22.7
44.75
20.8
43
19.1
pF
Capacitance ratio
VR = 2 V, VR = 8 V, f = 1 MHz 2.152.05 -2.25
CT2/CT8
Capacitance matching
VR = 2 V, VR = 8 V, f = 1 MHz
CT/CT- 3 %-
Series resistance
VR = 2 V, f = 100 MHz 0.18-
rs-
Q- 200Q factor
VR = 2 V, f = 100 MHz - -
CT Capacitance groups, coded 1, 2
Code CT (2V) CT (8V) Unit
1 43 ... 45 19.1 ... 21.95 pF
2 44.5 ... 46.5 19.75 ... 22.7 pF
BB814
Jul-05-20013
Capacitance ratio CTref / CT = f (VR)
per diode, Vref = parameter, f = 1MHz
0
0
EHD07057BB 814
C
T
R
V
Tref
C
51015V20
1
2
3
4
5
6
V
ref
= 1 V
2 V
3 V
Diode capacitance CT = f (VR)
f = 1MHz
10
EHD07054BB 814
CT
R
V
-1 0
10 1
10 2
10V
0
10
20
30
40
50
60
70
pF
80
