BH4126FV
Communication ICs
Wide band IF detector for RF remote
control units
BH4126FV
The BH4126FV is an IC equipped with internal mixer, IF amplifier, and FM detector circuits, developed for use with RF
remote control units.
!Applications
Keyless entry
!Features
1) Equipped with internal mixer, IF, RSSI, and FM
detection circuits.
2) Can be operated at mixer input frequencies ranging
from 20MHz to 300MHz.
3) Equipped with a battery power saving function.
4) Fast RSSI response.
5) High FM detection sensitivity. (21.2mV / kHz)
BH4126FV
Communication ICs
!
!!
!Block diagram
16 15 14 13 12 11 10
8765432
1
9
IF output
IF input FM detector
output
RSSI
V
CC
V
CC
V
CC
V
CC
RSSI
IF
Battery save
Local
Local OSC.
Quadrature
DET.
!
!!
!Absolute maximum ratings (Ta=25°C, for measurement circuit)
Parameter Symbol Limits Unit
Power supply voltage V
CC
7.0 V
mW
Power dissipation P
D
350
Storage temperature Tstg -55~+125 ˚C
*1 Reduced by 3.5 mW for each increase in Ta of 1
˚C
over 25
˚C
.
*1
!
!!
!Operating range
Parameter Symbol Limits Unit
Operating power supply voltage
V
CC
2.3~5.5 V
˚C
Operating temperature Topr -40~+85
BH4126FV
Communication ICs
!
!!
!Pin descriptions
V
CC
To MIXER
5k
1
2
3
4
30k
270
V
CC
Pin No.
1
Local oscillator pin (base)
Connect crystal resonator
and capacitor
2
Local oscillator pin (emitter)
Connect capacitor or input local signal
from external oscillator
3
Battery save pin
"Pin 3 voltage" ≤ 0.2 : Battery save
2 V ≤ "Pin 3 voltage" ≤ V
CC
: Active
4
Mixer output pin
Connect ceramic filter
Output impedance: 330Ω
5
V
CC
- 0.6
V
CC
-
V
CC
- 1.5
GND
GND pin GND for IF stages and FM detection stages
Function DC voltage(V)Internal peripheral circuit
BH4126FV
Communication ICs
10
6
7
VCC
170
170
3k
15k
VCC
11
VCC
100
Pin No.
6
IF amplifier bypass pin
Connect capacitor
7
IF amplifier input pin
Connect ceramic filter
Input impedance: 330Ω
9
8
V
CC
pin 1
V
CC
pin 2
Vcc for MIX stages and IF front stage
Vcc for IF rear stage and FM detection stage
10
RSSI output pin
Connect capacitor
11
12
V
CC
V
CC
V
CC
V
CC
0.1
V
CC
-
1
IF amplifier output pin
Pins 11 and 12 are opposite-phase
output
Function DC voltage (V)Internal peripheral circuit
BH4126FV
Communication ICs
13
V
CC
500
14
V
CC
330
16
V
CC
2.4k
2.4k
Pin No.
13
Discriminator pin
Connect phase shift
coil or ceramic discriminator
FM demodulation signal output pin
Output impedance is 360Ω
15
14
16
GND pin GND for MIX stage
Mixer pin
Connect first IF signal from DC cutoff
V
CC
0.9
GND
1.0
Function DC voltage(V)
Internal peripheral circuit
BH4126FV
Communication ICs
!
!!
!Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=3.0V)
_ Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz, 100dBµV
_ AC level to be indicated by termination
Parameter Symbol Min. Typ. Max. Unit Conditions
Quiescent current
I
Q
I
Q (BS)
V
TH-H
V
TH-L
5.5 mA With local oscillation OFF
Active
Battery save
Battery save quiescent current
Battery save function input voltage
4.4
0-
-2
-GND
6.6
µA5
VV
CC
V0.2
〈 MIX - Oscillator section 〉
f
MIX
G
VC
V
OM
IP3
NF
Y
IN (MIX)
R
O (MIX)
f
LO
V
IN (LO)
Y
IN (LO)
V
IN (MIX)
= 60dBµV
f1=248.75MHz,f2=249.05MHz
LC matching input
Mixer operating frequency
Mixer conversion gain
3rd order intercept point
Noise figure
Mixer input admittance
Mixer output resistance
Local oscillator operating frequency
Local input level
Local input admittance
-1dB compression output level
-20
-
-
-
-
20
95
-
2016
103
110
9.7
1.25+j7.47
330
-
100
1.36+j9.72
-
MHz300
dB24
dBµV
dBµV
dB
ms
Ω
MHz
dBµV
ms
-
-
-
-
-
120
105
-
f=248.45MHz
f=237.75MHz
BH4126FV
Communication ICs
Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz,100dBµV, fIN (IF) = 10.7MHz;
AC level to be indicated by termination
Parameter Symbol Min. Typ. Max. Unit Conditions
〈 IF section 〉
DR
DR
No input
IF operating frequency
IF amplifier gain
IF output level
IF duty ratio
〈 RSSI section 〉
Output voltage 1
Output voltage 2
Output voltage 3
Dynamic range
Output resistance
Rise time at power on
Fall time at power off
RSSI rise time
RSSI fall time
IF input resistance
-4
0.4
40
-
1.0
1.8
-
12
-
-
-
-
75-
330
0.5
50
0.15
1.2
2.0
70
15
20
5
9
11
-
MHz15
dB-
Ω
%
V
V
V
dB
-
0.6
60
0.4
1.4
2.2
-
18
-
-
-
-
f
IF
GV
RIN (IF)
VOIF
VRSSI1
VP-P VIN (IF) = 80dBµV
VIN (IF) = 80dBµV, CL = 10pF
VRSSI2
VRSSI3
RO (RSSI)
TON
TOFF
TR
TF
VIN (IF) = 70dBµV
VIN (IF) = 100dBµV
kΩ
µs
µs
µs
µs
CL = 100pF, VIN (MIX) = 60dBµV
CL = 100pF, VIN (MIX) = 60dBµV
CL = 100pF, VIN (MIX) = 60dBµV
CL = 100pF, VIN (MIX) = 60dBµV
Signal source : fIN (IF) =10.7MHz, ∆f=±10kHz dev, fm=1kHz;
AC level to be indicated by termination
Parameter Symbol Min. Typ. Max. Unit Conditions
〈 Detector unit 〉
SDET
VO
fDET
S (12dB)
S / N
AMR
VIN (IF) = 80dBµV
VIN (IF) = 80dBµV, AM = 30%
Detection sensitivity
Detection output level
12 dB SINAD sensitivity
S / N ratio
AM rejection ratio
Detection frequency
21.2-
12
40
-
150110
100
16
48
40
-
mV / kHz
-
mVrms195
kHz
dBµV
dB
dB
-
20
-
-
VIN (IF) = 80dBµV
VIN (IF) = 80dBµV
VIN (IF) = 80dBµV
BH4126FV
Communication ICs
!
!!
!Measurement circuit
16 15 14 13 12 11 10 9
87654321
V
~V
~V
~
A
V
~
V
V
V
SG1
f
IN
=248.45MHz
V
IN
=60dBµV
51
4.7k
100p
CL
CL
1000p
V6 V6 V5
V4
RIN=100kΩ
30kHz LPF T1
3p
CL=10pF
(Includes the capacity of the measurement system.)
T1: 4162-JPS-024 (SUMIDA)
V
CC
V
CC
V
CC
RSSI
IF
Quadrature
DET.
Local OSC.
0.1
10
62 0.01
0.01
1000p
1000p
3k
51
I1
SW4
SW3SW2
SW1
2
1
V3
SG3
f
IN
=10.7MHz
2
21
1
0.3V
1.9V
1
2
V1
V2
SG2
f
IN
=237.75MHz
V
IN
=100dBµV
Units Resistance : Ω
Capacitance :
µ
V
Fig. 1
BH4126FV
Communication ICs
!
!!
!Application example
16 15 14 13 12 11 10 9
876543
21
fIN=248.45MHz
100p
0.1 10
1000p
IF OUT
FM Detector Out RSSI
T1
3p
Without FM detector.
T1: 4162-JPS-024 (SUMIDA)
VCC
IF OUT
VCC
VCC
VCC
RSSI
IF
Quadrature
DET.
Local OSC.
0.01
1000p
BS
fLO=237.75MHz
VIN=100dBµVUnits Resistance
: Ω
Capacitance : µF
Fig. 2
0.1
12
121314
Open
BH4126FV
Communication ICs
!
!!
!External dimensions (Units: mm)
SSOP - B16
9
8
16
1
0.1
6.4±0.3
4.4±0.2
5.0±0.2
0.1
0.15±0.1
0.22±0.1
0.65
1.15±0.1
0.3Min.
Appendix
Appendix1-Rev1.0
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
