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TEMIC Semiconductors

U3741BM Datasheet Preview

U3741BM Datasheet

UHF ASK/FSK Receiver

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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
www.DataSheet4U.com
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)




TEMIC Semiconductors

U3741BM Datasheet Preview

U3741BM Datasheet

UHF ASK/FSK Receiver

No Preview Available !

U3741BM
Ordering Information
Extended Type Number
U3741BM-M2FL
U3741BM-M2FLG3
U3741BM-M3FL
U3741BM-M3FLG3
Package
SO20
SO20
SO20
SO20
Remarks
2: IF bandwidth of 300 kHz, tube
2: IF bandwidth of 300 kHz, taped and reeled
3: IF bandwidth of 600 kHz, tube
3: IF bandwidth of 600 kHz, taped and reeled
www.DataSheePt4Uin.coDm escription
SENS 1
20 DATA
FSK/ASK 2
19 ENABLE
CDEM 3
AVCC 4
18 TEST
17 POUT
AGND 5
16 MODE
DGND 6
15 DVCC
MIXVCC 7
14 XTO
LNAGND 8
13 LFGND
LNA_IN 9
12 LF
n.c. 10
11 LFVCC
14844
Figure 2. Pinning SO20
Pin Symbol
Function
1 SENS Sensitivity-control resistor
2 FSK/ASK Selecting FSK/ASK
Low: FSK, High: ASK
3 CDEM Lower cut-off frequency data filter
4 AVCC Analog power supply
5 AGND Analog ground
6 DGND Digital ground
7 MIXVCC Power supply mixer
8 LNAGND High-frequency ground LNA and
mixer
9 LNA_IN RF input
10 n.c. Not connected
11 LFVCC Power supply VCO
12 LF Loop filter
13 LFGND Ground VCO
14 XTO Crystal oscillator
15 DVCC Digital power supply
16 MODE Selecting 433.92 MHz /315 MHz
Low: 4.90625 MHz (USA)
High: 6.76438 (Europe)
17 POUT Programmable output port
18 TEST Test pin, during operation at GND
19 ENABLE Enables the polling mode
Low: polling mode off
(sleep mode)
H: polling mode on
(active mode)
20 DATA Data output / configuration input
2 (25)
Rev. A1, 15-Oct-98
Preliminary Information


Part Number U3741BM
Description UHF ASK/FSK Receiver
Maker TEMIC Semiconductors
Total Page 25 Pages
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