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| U4256BM-R Datasheet, PDF (13/19 Pages) ATMEL Corporation – Frequency Synthesizer for Radio Tuning | |||
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U4256BM-R
Data Transfer
Table 1. Control Registers
A
MSB
BYTE 3
LSB MSB
BYTE 2
LSB MSB
ADDR.
STATUS 0
DAC3
R-Divider
00
OSCB
IPD
0=on, P-22 P-21 P-20
215
214
213
212
210
211
29
28
27
1=off
B71 B70 B69 B68 B67 B66 B65 B64 B63 B62 B61 B60 B59 B58 B57
BYTE 1
LSB
26
25
24
23
22
21
20
B56 B55 B54 B53 B52 B51 B50
B
MSB
BYTE 3
LSB MSB
BYTE 2
LSB MSB
ADDR.
STATUS 1
N-Divider
AM=1 SWO4 SWO3 SWO2 SWO1
0
1
0 FM=0 0=on, 0=on, 0=on, 0=on, 215
214
213
212
210
211
29
28
27
DAC 1=off 1=off 1=off 1=off
B35 B34 B33 B32 B31 B30 B29 B28 B27 B26 B25 B24 B23 B22 B21
BYTE 1
LSB
26
25
24
23
22
21
20
B20 B19 B18 B17 B16 B15 B14
C
MSB
ADDR.
00
BYTE 2
O-25 O-24
DAC1 OFFSET
O-23 O-22 O-21
B49 B48 B47 B46 B45
LSB
O-20
B44
MSB
G-27
B43
G-26
B42
G-27
B41
BYTE 1
DAC1 GAIN
G-25 G-24
B40 B39
G-23
B38
G-22
B37
LSB
G-20
B36
D
MSB
ADDR.
01
BYTE 2
O-25 O-24
DAC2 OFFSET
O-23 O-22 O-21
B13 B12 B11 B10 B9
LSB
O-20
B8
MSB
G-27
B7
G-26
B6
G-27
B5
BYTE 1
DAC2 GAIN
G-25 G-24
B4 B3
G-23
B2
G-22
B1
LSB
G-20
B0
E
MSB
BYTE 2
LSB MSB
BYTE 1
LSB
ADDR.
Oscillator tuning function
Not used
1 0 8pF 32pF 16pF 8pF 4pF 2pF 1pF 0.5pF X
X
X
X
X
X
B85 B84 B83 B82 B81 B80 B79 B78 B77 B76 B75 B74 B73 B72
Absolute Maximum Ratings
Parameters
Symbol
Value
Unit
Analog supply voltage Pin 6
VS
8 to 12
V
Input voltage BUS
Pins 16, 17 and 18
VI
-0.3 to +5.3
V
Output current switches Pins 7, 8, 9 and 10
IO
(see Figure 10)
-1 to +5
mA
Drain voltage switches Pins 7, 8, 9 and 10
VOD
15
V
Ambient temperature range
Tamb
-40 to +85
°C
Storage temperature range
Tstg
-40 to +125
°C
Junction temperature
Tj
125
°C
Electrostatic handling M.M.
VESD
300
V
13
4562CâAUDRâ08/04
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