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PDF SDA4331X Data sheet ( Hoja de datos )
| Número de pieza | SDA4331X | |
| Descripción | PLL with I2C Bus for AM/FM Receivers | |
| Fabricantes | Siemens | |
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PLL with I2C Bus for AM/FM Receivers
SDA 4331X
1 Overview
1.1 Features
• 155 MHz FM and 40 MHz AM input frequency
• 30 mVeff AM and 50 mVeff FM sensitivity
• Additional open drain ports controlled by I2C Bus
• 2-pin quartz oscillator
• Fast phase detector with short anti-backlash pulses
and polarity reversal
P-DSO-24-1
• Charge pump current programmable in four steps
up to 4.5 mA
• Frequency resolution of 1, 5 and 10 kHz AM and 12.5, 25 and 50 kHz FM
• P-DSO-24 package
Type
SDA 4331X
Ordering Code
Q67100-H5139
Package
P-DSO-24-1
1.2 Application
The SDA 4331X provides separated input and output ports for AM and FM and is well
suited for extremely fast loop settling times in the FM mode.
Semiconductor Group
1
04.96
1 page  
SDA 4331X
2 Functional Description
The SDA 4331X is a radio PLL controlled via I2C Bus for frequency synthesis in the AM
and FM range.
3 Circuit Description
The reference frequency for the PLL is derived from the quartz oscillator OSC1). The
R-prescaler can be adapted to quartz frequencies of 4, 8 or 10.25 MHz, respectively,
yielding an internal 50 kHz reference. Programming the R-counter sets the phase
detector reference frequency to 1, 5 or 10 kHz in the AM mode or to 12.5, 25 or 50 kHz
in the FM mode. The VCO frequency is set by programming the A/N-counter which
operates as dual-modulus counter for FM and AM using a divide by 4/5 swallow counter.
The phase detector drives two different charge pumps for AM and FM mode. Additional
source followers are connected to the charge pump. There are four programmable
current levels for each charge pump. The supply voltage for the charge pump and the
source followers is supplied via the VDD2 pin and can reach 10 V maximum. AM/FM is an
open drain output as well as the additional outputs SA1 … SA4 which are controlled by
I2C Bus.
The I2C Bus interface provides slave receiver functions. There are two addresses
selected by the A0 pin. The I2C-protocol (see diagram 1) contains one string for
programming all counters and functions. The transfer may be stopped optionally after
each word if the remaining functions are not to be altered. After power ON all control
signals are undefined, so that the complete write sequence must be executed.
1) The power dissipation of the quartz is given by:
Pv = 2 × R1 (Π × fQ × (CO + CL) × VDD)2
R1 … Series resistance of the quartz
fQ … Quartz frequency
CO … Parallel capacitance of the quartz
CL … Load capacitance, including input capacitance of the IC
Semiconductor Group
5
04.96
5 Page 
SDA 4331X
Diagram 1: I2C Protocol
Slave-receive (Write)
START
1
1
0
0
1
0
0/1
0
ACK
MSB
N14
N13
N12
N11
N10
N9
N8
ACK
N7
N6
N5
N4
N3
N2
N1
LSB
ACK
[STOP or START]
AM/FM
PD1
PD0
IF
SA4
SA3
SA2
SA1
ACK
[STOP or START]
G1
G0
F0
R1
R0
RP1
RP0
0
ACK
[STOP or START]
PPD
T0 (= 0)
T1 (= 0)
T2 (= 0)
T3 (= 0)
X
X
X
ACK
STOP or START
A/N-counter
[STOP or START]:
Optional STOP or START condition, after power ON
the complete sequence has to be programmed.
Semiconductor Group
11
04.96
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SDA4331X.PDF ] | |
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