U3550BM Datasheet, PDF (2/25 Pages) TEMIC Semiconductors – Low-Power FM Transmitter / Synthesizer System 26 to 50 MHz

U3550BM
Pin Description
MCKO ¹
28 _VCC
D2
27 VSS
C3
26 _MCKA
OSCGND 4
25 _MODIN
XCK ⁵
24 _LFGND
OSCVDD 6
DELVB 7
DELGND 8
23 _MLF
22 _VBAT
21 _AGND
GREF ⁹
20 _VTX
MIXIN 10
MIXVB 11
19 _RFOVB
18 _RFO
MIXO ¹²
17 _RFOGND
LO1 13
16 _LOGND
LO2 ¹⁴
15 _PCLO
11623
Figure 2. Pinning
Order Information
Extended Type Number
U3550BM-AFL
U3550BM-AFLG3
Package
SO28
SO28
Pin Symbol
Function
1 MCKO Clock output for peripherals
2
D Data input of serial bus
3
C Clock line of serial bus
4 OSCGND Oscillator ground
5
XCK Oscillator input (11.15 MHz)
6 OSCVDD Oscillator supply input
7 DELVB Phase correction VCO3 supply
input
8 DELGND Phase correction VCO3 ground
9
GREF Voltage reference for internal
current sources
10 MIXIN Mixer input
11 MIXVB Mixer-supply input
12 MIXO Mixer output
13
LO1 Tank elements for LO are
14
LO2 ^{connected to these pins}
15 PCLO Phase comparator PLL3 output
16 LOGND VCO3 ground
17 RFOGND RF transmit output ground
18
RFO RF transmit output
19 RFOVB Power-supply input of RF
transmit output buffer
20
VTX Power-supply output of RF
external power amplifier
21 AGND Analog ground
22 VBAT Power supply of analog part
23
MLF Modulator loop filter
24 LFGND Modulator loop-filter ground
25 MODIN Modulator input signal
26 MCKA Peripheral-clock output
adjustment
27
VSS Digital ground
28
VCC Power supply of digital part
Remarks
Taped and reeled
2 (25)
Rev. A2, 10-Sep-98
Preliminary Information