AK2401 Datasheet, PDF (95/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

16. Recommended External Circuits
16.1. Recommended External Circuits
OPTIONAL
LPF
VCO
[AK2401]
LG
LD
VDD
RL
L1
OPTIONAL BPF
L3
C4 C5
L2
RO2
CS4
T1
RO1
C1
28. LNAIN
D1
C2
29. LNACONT
LS
31. BIAS1
RB1
33. AOUT_P
34. AOUT_N
CB15
38. VCOM_AD
CS1
RS3 _CS3
RS2'
RS2
CS2
9. TCXOIN
10. VREF2
8. VREF1
6. SMFOUT
5. BIAS2
TAB
C7
CB14
CB13
CP13
RB2
MCU/DSP
16.2.
List of Parts
Table 11. Parts List for External Circuit Connection
Ref. Value
Description
Ref. Value
Description
LG 30nH
T1
4:1
RFOUT=450MHz
JTX-4-10T
LS 3.3nH
RO1 100Ω
C2 3.6pF
LNAIN=450MHz
RO2 100Ω
C1
100pF ^{Normal Power Mode} RS2
-
LD
-
RS2’
-
D1
-
LG 47nH
RS3
-
CS1
-
LOOP FILTER
LS 3.3nH
CS2
-
C2 1.3pF
C1 100pF
LNAIN=450MHz
Low Power Mode
CS3
-
CS4 1000pF
LD
-
C7 100pF
D1
-
CB13 10μF
RL 200Ω
CP13 100pF
L1
27nH LNAOUT=450MHz CB14 0.47μF
C4 3.9pF
CB15 2.2μF
L2 220nH
RB1 47kΩ ±1% recommended
L3
22nH
DEMIN=450MHz
RB2 27kΩ ±1% recommended
C5
20pF
*Coil inductors are used.
*Matching circuit examples at frequencies other than 450 MHz are prepared as application notes.
Contact us separately.
*DAN217UM is used for the diode LD.
017003093-E-00
95
2017/3