U2731B
| Model | U2731B |
| Description | DAB ONE- CHIP FRONT END |
| PDF file | Total 25 pages (File size: 654K) |
| Chip Manufacturer | ATMEL |
I50 and I100 define the charge pump current:
Table 4.
Current of Charge Pump
I50
LOW
HIGH
LOW
HIGH
I100
LOW
LOW
HIGH
HIGH
Charge-pump Current
(nominal)/µA
50
100
150
200
Mi defines the operation mode:
Table 5.
Mode Selection
M3
LOW
LOW
HIGH
X
X
X
Note:
M2
LOW
HIGH
HIGH
X
X
X
M1
X
X
X
LOW
HIGH
HIGH
M0
X
X
X
LOW
LOW
HIGH
Mode
f
LO,IFMIX
= f
ref
f
LO,IFMIX
= 2
×
f
ref
IF mixer switched off
RF mixer A active, f
LO,RFMIX
= f
VCO
RF mixer B active, f
LO,RFMIX
= f
VCO
RF mixer B active, f
LO,RFMIX
= f
VCO
/2
SWα = HIGH switches on the output current (α = A, B, C)
Simple Two-wire Bus
Data Transfer
Format:
START - ADR - ACK - <instruction set> - STOP
The <instruction set> consists of a sequence of A bytes, B bytes, C bytes and D bytes
each followed by ACK. Always a triplet of these bytes (A, B, C or D) has to be completed
before a new triplet is started. If no new triplet is started the transmission can be finished
before the current triplet is finished.
Examples:
START - ADR - ACK - DB1 - ACK - DB2 - ACK - DB3 - ACK - CB1 - ACK - CB2 - ACK -
CB3 - ACK - AB1 - ACK - AB2 - ACK - AB3 - ACK - BB1 - ACK - BB2 - ACK - BB3 - ACK
- STOP
START - ADR - ACK - CB1 - ACK - CB2 - ACK - STOP
However:
START - ADR - ACK - DB1 - ACK - CB1 -ACK - STOP is not allowed.
Description:
START
STOP
ACK
ADR
αBi
Start condition
Stop condition
Acknowledge
Address byte
α
byte i (α = A, B, C, D; i = 1, 2, 3)
12
U2731B
4671C–DAB–06/04
Related PDFs
| Model | Description | Manufacturer | Operation |
|---|---|---|---|
 U2731B-NFN
|
DAB ONE- CHIP FRONT END | ATMEL | Preview |
|
U2731B-NFNG1
|
DAB ONE- CHIP FRONT END | ATMEL | Preview |
