MAX2112CTI+ Maxim Integrated Products, MAX2112CTI+ Datasheet - Page 11

• Manufacturer Part Number: MAX2112CTI+
• Description: RF Receiver Direct Conversion Tu ner for DVB-S2 -40 t
• Manufacturer: Maxim Integrated Products

Specifications of MAX2112CTI+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 8. PLL Register
Table 9. VCO Register
Table 10. Lowpass Filter Register
BIT NAME
BIT NAME
BIT NAME
VCO[4:0]
LPF[7:0]
ADE
CPS
VAS
ADL
D24
ICP
X
BIT LOCATION (0 = LSB) DEFAULT
BIT LOCATION (0 = LSB) DEFAULT
BIT LOCATION (0 = LSB) DEFAULT
______________________________________________________________________________________
4–0
7–3
7–0
7
6
5
2
1
0
01001011
11001
X
1
1
0
1
0
0
Tuner for DVB-S2 Applications
Complete, Direct-Conversion
VCO divider setting.
0 = Divide by 2. Use for LO frequencies ≥ 1125MHz.
1 = Divide by 4. Use for LO frequencies < 1125MHz.
Charge-pump current mode.
0 = Charge-pump current controlled by ICP bit.
1 = Charge-pump current controlled by VCO autoselect (VAS).
Charge-pump current.
0 = 600µA typical.
1 = 1200µA typical.
Don’t care.
C ontr ol s w hi ch V C O i s acti vated w hen usi ng m anual V C O p r og r am m i ng m od e.
Thi s al so ser ves as the star ti ng p oi nt for the V C O autosel ecti on ( V AS ) m od e.
VCO autoselection (VAS) circuit.
0 = Disable VCO selection must be programmed through I
1 = Enable VCO selection controlled by autoselection circuit.
Enables or disables the VCO tuning voltage ADC latch when the VCO
autoselect mode (VAS) is disabled.
0 = Disables the ADC latch.
1 = Latches the ADC value.
Enables or disables VCO tuning voltage ADC read when the VCO autoselect
mode (VAS) is disabled.
0 = Disables ADC read.
1 = Enables ADC read.
Sets the baseband lowpass filter 3dB corner frequency.
f
Default value equates to f
-3dB
= 4MHz + (LPF[7:0]
dec
-3dB
- 12) x 290kHz.
= 22.27MHz typical.
FUNCTION
FUNCTION
FUNCTION
2
C.
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