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SN761644 Datasheet(PDF) 13 Page - Texas Instruments

Part # SN761644
Description  DIGITAL TV TUNER IC
PDF  30 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN761644 Datasheet(HTML) 13 Page - Texas Instruments

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SN761644
www.ti.com
SLES252 – NOVEMBER 2009
FUNCTIONAL DESCRIPTION
I
2C Bus Mode
I2C Write Mode (R/W = 0)
Table 2. Write Data Format
MSB
LSB
Address byte (ADB)
1
1
0
0
0
MA1
MA0
R/W = 0
A(1)
Divider byte 1 (DB1)
0
N14
N13
N12
N11
N10
N9
N8
A(1)
Divider byte 2 (DB2)
N7
N6
N5
N4
N3
N2
N1
N0
A(1)
Control byte 1 (CB1)
1
0
ATP2
ATP1
ATP0
RS2
RS1
RS0
A(1)
Band switch byte (BB)
CP1
CP0
AISL
P5
BS4
BS3
BS2
BS1
A(1)
Control byte 2 (CB2)
1
1
ATC
MODE
T3/DISGCA
T2/IFDA
T1/CP2
T0/XLO
A(1)
(1)
A : acknowledge
Table 3. Write Data Symbol Description
SYMBOL
DESCRIPTION
DEFAULT
MA[1:0]
Address-set bits (see Table 4)
N[14:0]
Programmable counter set bits
N14 = N13 = N12 = ... = N0 = 0
N = N14 × 214 + N13 × 213 + ... + N1 × 2 + N0
ATP[2:0]
RF AGC start-point control bits (see Table 5)
ATP[2:0] = 000
RS[2:0]
Reference divider ratio-selection bits (see Table 6)
RS[2:0] = 000
CP[1:0]
Charge-pump current-set bit (see Table 7)
CP[1:0] = 00
AISL(1)
RF AGC detector input selection bit
AISL = 0
AISL = 0: IF amplifier
AISL = 1: Mixer output
P5
Port output/ADC input control bit
P5 = 0
P5 = 0: ADC INPUT
P5 = 1: Tr = ON
BS[4:1]
Band switch control bits
BSn = 0
BSn = 0: Tr = OFF
BSn = 1: Tr = ON
Band selection by BS[1:2]
BS1
BS2
1
0
VHF-LO
0
1
VHF-HI
0
0
UHF
1
1
Standby mode/stop MOP function (XTALOUT is available in standby
mode)
ATC
RF AGC current-set bit
ATC = 0
ATC = 0: Current = 300 nA
ATC = 1: Current = 9
μA
Mode
Mode
IFGCA enabled, DIFOUT1, 2 selected
MODE = 0
T3/DISGCA
= 0 :
T3/DISGCA, T2/IFDA, T1/CP2, T0/XLO are Test bits and XTALOUT control bit
T[3:0] = 0000
T2/IFDA
(see Table 8)
T1/CP2
Mode
T3/DISGCA = 0 : IF GCA enabled
T0/XLO
= 1
T3/DISGCA = 1 : IF GCA disabled
T2/IFDA = 0 : DIFOUT1, 2 selected
T2/IFDA = 1 : AIFOUT selected
T1/CP2 : lcp control bit, See Table 7
T0/XLO = 0 : XTALOUT enabled
T0/XLO = 1 : XTALOUT disabled
(1)
When AISL = 1, RF AGC function is not available at VHF-L band (Output level is undefined.)
Copyright © 2009, Texas Instruments Incorporated
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