Datasheet

Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Detailed Description
Register Description
The MAX2112 includes 12 user-programmable regis-
ters and 2 read-only registers. See Table 1 for register
configurations. The register configuration of Table 1
shows each bit name and the bit usage information for all
registers. Note that all registers must be written after and
no earlier than 100µs after the device is powered up.
Pin Description (continued)
PIN NAME FUNCTION
26 SDA 2-Wire Serial-Data Interface. Requires ≥ 1kΩ pullup resistor to V
CC
.
27 SCL 2-Wire Serial-Clock Interface. Requires ≥ 1kΩ pullup resistor to V
CC
.
28 ADDR Address. Must be connected to either ground (logic 0) or supply (logic 1).
— EP Exposed Paddle. Solder evenly to the board’s ground plane for proper operation.
Table 1. Register Configuration
MSB LSB
DATA BYTE
REG
NUMBER
R EG I ST ER
N A M E
R EA D /
WR IT E
R EG
A D D R ESS
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
1
N-Divider
MSB
Write 0x00
FRAC
1
N[14] N[13] N[12] N[11] N[10] N[9] N[8]
2
N-Divider
LSB
Write 0x01 N[7] N[6] N[5] N[4] N[3] N[2] N[1] N[0]
3
Charge
Pump
Write 0x02
CPMP[1]
0
CPMP[0]
0
CPLIN[1]
0
CPLIN[0]
1
F[19] F[18] F[17] F[16]
4
F-Divider
MSB
Write 0x03 F[15] F[14] F[13] F[12] F[11] F[10] F[9] F[8]
5
F-Divider
LSB
Write 0x04 F[7] F[6] F[5] F[4] F[3] F[2] F[1] F[0]
6
XTAL
Divider
R-Divider
Write 0x05 XD[2] XD[1] XD[0] R[4] R[3] R[2] R[1] R[0]
7 PLL Write 0x06 D24 CPS ICP X X X X X
8 VCO Write 0x07 VCO[4] VCO[3] VCO[2] VCO[1] VCO[0] VAS ADL ADE
9 LPF Write 0x08 LPF[7] LPF[6] LPF[5] LPF[4] LPF[3] LPF[2] LP F[ 1] LPF[0]
10 Control Write 0x09 STBY X
PWDN
0
X BBG[3] BBG[ 2] BBG[ 1] BBG[ 0]
11 Shutdown Write 0x0A X
PLL
0
DIV
0
VCO
0
BB
0
RFMIX
0
RFVGA
0
FE
0
12 Test Write 0x0B
CPTST[2]
0
CPTST[1]
0
CPTST[0]
0
X
TURBO
1
LD
M U X[ 2]
0
LD
M U X[ 1]
0
LD
M U X[ 0]
0
13
Status
Byte-1
Read 0x0C POR VASA VASE LD X X X X
14
Status
Byte-2
Read 0x0D V C OS BR[4] V C OS BR[3] V C OS BR[2] V C OS BR[1] V C OS BR[0] AD C[ 2] AD C[ 1] AD C[ 0]
X = Don’t care. 0 = Set to 0 for factory-tested operation. 1 = Set to 1 for factory-tested operation.
MAX2112
Maxim Integrated
9