AK2365A Datasheet, PDF (19/33 Pages) Asahi Kasei Microsystems – FM IF Detector with Narrow Band Filter

[AK2365A]
2) Description of registers
Address 0x01 (Control Register 1)
Name
D7(MSB) D6
D5
Control Register 1
BS[2:0]
Initial Value
0
1
0
D4
BAND
0
D3
D2
BPF_BW[1:0]
0
0
D1 D0(LSB)
LOFREQ[1:0]
0
1
BS[2:0]: Operation mode setting
PDN
pin
BS[2]
BS[1]
BS[0]
Mode
name
Mode 0
0
-
-
-
(Power-
down)
1
0
0
1
Mode 1
(Note1)
Mode 2
1
0
1
0
(initial
value)
1
0
1
1 Mode 3
LDOD
LDOA,
AGNDIN
OFF OFF
ON OFF
ON ON
ON ON
VREF
OFF
OFF
OFF
ON
MIX
AGC,
BPF,
Divider
OFF
IFBUF
OFF
OFF OFF
OFF OFF
OFF OFF
Limiter,
RSSI
OFF
OFF
OFF
OFF
DISCRI,
Noise
Squelch
OFF
OFF
OFF
OFF
1
1
0
0 Mode 4 ON ON
ON
ON
ON
OFF
OFF
1
1
0
1 Mode 5 ON ON
ON
ON
ON
ON
OFF
1
1
1
0 Mode 6 ON ON
ON
ON OFF
ON
ON
1
1
1
1 Mode 7 ON ON
ON
ON
ON
ON
ON
Note1: Do not use Mode1.
Note2: Do not set the combination of the code which is not defined in the table given above.
BAND：Demodulated signal level setting
BAND
Function
0
Narrow
1
Wide
Note1: When {BAND} register is set to “0”, demodulated signal level at AUDIOOUT pin, when input
signal is f=1.5kHz dev, is 100mVrms typ. When {BAND} register is set to “1”, demodulated signal
level at AUDIOOUT pin, when input signal is f=3.0kHz dev, is 100mVrms typ.
BPF_BW[1:0]: BPF band width setting
BPF_BW
[2]
BPF_BW
[1]
BPF_BW
[0]
1
0/1
0/1
0
0
0
0
0
1
0
1
0
0
1
1
MS1591-E-03
name
F0
F1
F2
F3
F4
6dB
attenuation
±7.5kHz
±6kHz
±4.5kHz
±3kHz
±2kHz
- 19 -
Attenuation
band width
±15kHz
±12.5kHz
±11kHz
±9kHz
±7kHz
2015/4