U4256BM-R Datasheet, PDF (2/19 Pages) ATMEL Corporation – Frequency Synthesizer for Radio Tuning

Pin Description
Pin
Symbol
1
PDO
2
PD
3
DAC1
4
DAC2
5
DAC3
6
VS
7
SWO1
8
SWO2
9
SWO3
10
SWO4
11
GND
12
OSCOUT
13
OSCIN
14
V5
15
MX2LO
16
DATA
17
CLK
18
EN
19
FMOSCIN
20
GNDan
Function
Phase detector output
Pulsed current output
Digital-to-analog converter 1
Digital-to-analog converter 2
Digital-to-analog converter 3
Supply voltage analog part
Switching output 1
Switching output 2
Switching output 3
Switching output 4
Ground, digital part
Reference oscillator output
Reference oscillator input
Capacitor band gap
Oscillator buffer output
Data input
Clock
Enable
FM-oscillator input
Ground, analog part
Figure 2. Block Diagram
Tuning
13
OSCIN
12 Oscillator
OSCOUT
15
MX2LO
OSC
buffer
CLK
DATA
EN
17
16 ^3W-
bus
18 _interface
19
FMOSCIN
FM-
preamp
20
GNDan
SWO1 SWO2 SWO3 SWO4
7 8 9 10
Switching outputs
DAC3
3-bit
VRef
DAC2
5
DAC3
4
DAC2
N-
divider
R-
divider
Phase
detector
Bandgap
14
V5
DAC1
3
DAC1
Current
sources
11
GND
6
VS
DAC
AM/FM
VRef
1
PDO
2
PD
2 U4256BM-R
4562C–AUDR–08/04