U3741BM Datasheet PDF - TEMIC Semiconductors
| Part Number | U3741BM | |
| Description | UHF ASK/FSK Receiver | |
| Manufacturers | TEMIC Semiconductors | |
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UHF ASK/FSK Receiver
U3741BM
Description
The U3741BM is a multi-chip PLL receiver device
supplied in an SO20 package. It has been specially
developed for the demands of RF low-cost data
transmission systems with low data rates from 1 kBaud to
10 kBaud (1 kBaud to 3.2 kBaud for FSK) in Manchester
or Bi-phase code. The receiver is well suited to operate
with the TEMIC PLL RF transmitter U2741B. Its main
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Features
D Minimal external circuitry requirements, no RF
components on the PC board except adaptation to the
receiver antenna
D High sensitivity, especially at low data rates
D Sensitivity reduction possible even while receiving
D Fully integrated VCO
D Low power consumption due to configurable self
polling with a programmable timeframe check
D Supply voltage 4.5 V to 5.5 V,
operating temperature range –40°C to 105°C
D Single-ended RF input for easy adaptation to
l/4 antenna or printed antenna on PCB
D Low-cost solution due to high integration level
applications are in the areas of telemetering, security
technology and keyless-entry systems. It can be used in
the frequency receiving range of f0 = 300 MHz to
450 MHz for ASK or FSK data transmission. All the
statements made below refer to 433.92-MHz and
315-MHz applications.
D ESD protection according to MIL-STD. 883
(4KV HBM) except Pin POUT (2KV HBM)
D High image frequency suppression due to 1 MHz IF
in conjunction with a SAW front-end filter. Up to
40 dB is thereby achievable with newer SAWs.
D Programmable output port for sensitivity selection or
for controlling external periphery
D Communication to m C possible via a single,
bi-directional data line
D Power management (polling) is also possible by
means of a separate pin via the m C
D 2 different IF bandwidth versions are available
(300 kHz and 600 kHz)
System Block Diagram
1 Li cell
Encoder
Keys M44Cx9x
UHF ASK/FSK
Remote control transmitter
U2741B
UHF ASK/FSK
Remote control receiver
U3741BM
Demod.
Control
XTO
PLL
VCO
Antenna Antenna
IF Amp
PLL
XTO
1...3
mC
Power
amp.
LNA
Figure 1. System block diagram
VCO
14917
Rev. A1, 15-Oct-98
Preliminary Information
1 (25)
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U3741BM
8 LNAGND
U3741BM
C3 L 9 LNA_N
22p 25n
8 LNAGND
U3741BM
C3 L 9 LNA_N
47p 25n
C16 C17
C16 C17
fRF = 433.92 MHz
100p
8.2p
L3
27n
TOKO LL2012
F27NJ
fRF = 315 MHz
100p
22p
L3
47n
TOKO LL2012
F47NJ
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RFIN
L2
TOKO LL2012
F33NJ
1 IN
B3555
OUT
C2 33n 2 IN_GND
OUT_GND
CASE_GND
8.2p 3,4 7,8
5
6
14105
RFIN
L2
TOKO LL2012
F82NJ
1 IN
B3551
OUT 5
C2 82n 2 IN_GND
OUT_GND 6
CASE_GND
10p 3,4 7,8
14106
Figure 5. Input matching network with SAW filter
fRF = 433.92 MHz
15p 25n
8 LNAGND
U3741BM
9 LNA_N
fRF = 315 MHz
33p 25n
8 LNAGND
U3741BM
9 LNA_N
RFIN
RFIN
3.3p 100p
22n TOKO LL2012
F22NJ
14107
3.3p 100p
39n TOKO LL2012
F39NJ
Figure 6. Input matching network without SAW filter
14108
Please notify that for all coupling conditions (see
figures 5 and 6), the bond wire inductivity of the LNA
ground is compensated. C3 forms a series resonance
circuit together with the bond wire. L = 25 nH is a feed
inductor to establish a DC path. Its value is not critical but
must be large enough not to detune the series resonance
circuit. For cost reduction this inductor can be easily
printed on the PCB. This configuration improves the
sensitivity of the receiver by about 1 dB to 2 dB.
Analog Signal Processing
IF Amplifier
The signals coming from the RF front end are filtered by
the fully integrated 4th-order IF filter. The IF center
frequency is fIF = 1 MHz for applications where
fRF = 315 MHz or fRF = 433.92 MHz is used. For other
RF input frequencies refer to table 1 to determine the
center frequency.
The U3741BM is available with 2 different IF
bandwidths. U3741BM-M2, the version with
BIF = 300 kHz, is well suited for ASK systems where the
TEMIC PLL transmitter U2741B is used. The receiver
U3741BM - M3 employs an IF bandwidth of
fIF = 600 kHz. This version can be used together with the
U2741B in FSK and ASK mode. If used in ASK
applications, it allows higher tolerances for the receiver
and PLL transmitter crystals. SAW transmitters exhibit
much higher transmit frequency tolerances compared to
PLL transmitters. Generally, it is necessary to use
BIF = 600 kHz together with such transmitters.
Rev. A1, 15-Oct-98
Preliminary Information
5 (25)
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for U3741BM electronic component. |
| Information | Total 25 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ U3741BM.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| U3741BM | The function is UHF ASK RECEIVER IC. ATMEL Corporation |  |
| U3741BM | The function is UHF ASK/FSK Receiver. TEMIC Semiconductors | |
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