U3741BM Datasheet, PDF (2/25 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

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
Pin Description
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