Rainbow Electronics MAX3540 - Manual (Page 6)

MAX3540
Complete Single-Conversion Television Tuner
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Detailed Description
Register Descriptions
The MAX3540 includes 11 programmable registers and
two read-only registers. The 11 programmable registers
include two N-divider registers, an R-divider register, a
VCO register, an RSSI/charge-pump/filter-select regis-
ter, a control register, a shutdown register, and tracking-
filter control registers. These 11 programmable regis-
ters are also readable. The read-only registers include
a status register and a ROM table data register.
Recommended default bit settings are provided for
user convenience only and are not guaranteed. The
user must write all registers after power-up and no ear-
lier than 100μs after power-up.
MSB LSB
DATA BYTE
REGISTER
NAME
R EA D /
W R I T E
REGISTER
ADDRESS
D7 D6 D5 D4 D3 D2 D1 D0
N-DIV High Both 0x00 0 N14 N13 N12 N11 N10 N9 N8
N-DIV Low Both 0x01 N7 N6 N5 N4 N3 N2 N1 N0
R-DIV Both 0x02 0 R6 R5 R4 R3 R2 R1 R0
VCO Both 0x03 VCO4 VCO3 VCO2 VCO1 VCO0 LD VDIV1 V D IV 0
IFOVLD,
Charge
Pump, and
Filter Select
Both 0x04 0 IFOVLD2 IFOVLD1 IFOVLD0 CP1 CP0 TF1 TF0
Control Both 0x05 0 0 0 0 SHDN_RF SHDN_IFAGC INPT1 IN P T0
Shutdown Both 0x06 S H D N _M IX 1 S H D N _M IX 0 S H D N _I F S H D N _P D S H D N _S Y N 0 0 0
Tracking
Filter Series
Cap
Both 0x07 TFS7 TFS6 TFS5 TFS4 TFS3 TFS2 TFS1 TFS0
Tracking
Filter
Parallel Cap
Both 0x08 FLD 0 TFP5 TFP4 TFP3 TFP2 TFP1 TFP0
Tracking
Filter ROM
Address
Both 0x09 0 0 0 0 TFA3 TFA2 TFA1 TFA0
Reserved Both 0x0A X X X X X X X X
ROM Table
Data
Readback
Read 0x0B TFR7 TFR6 TFR5 TFR4 TFR3 TFR2 TFR1 TFR0
Status Read 0x0C POR LD2 LD1 LD0 X X X X
Table 1. Register Configuration
BIT NAME BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
RESERVED 7 0 Must be set to 0.
N[14:8] 6–0 001 0010
Sets the most significant bits of the PLL integer divider (N). Default
integer divider value is N = 4688. N can range from 256 to 32,767.
Table 2. N-DIV High Register (Address: 0000
b
)