Specifications

DTT 7685x
SBU Technology – Tuners ATSC half NIM with Ch 3 / 4 modulator
20 Apr 2007
Preliminary Specification Page 12 / 29
Tuner Address (AB1):
Tuner Address
(Hex)
MA1 MA0 Voltage at Pin16 AS
C0 0 0 (0 to 0.1) *Vcc
C2 0 1 Open Circuit
C4 1 0 (0.4 to 0.6) *Vcc
C6 1 1 (0.9 to 1) *Vcc
Programmable Divider Byte 2 & 3 (DB2 and DB3)
Divider Ratio (N14 to N0):
N = Fosc (MHz)/62.5 kHz
N =16384*N14 + 8192*N13 + 4096*N12 + 2048*N11 + 1024*N10 + 512*N9 + 256*N8 +
128*N7 + 64*N6 + 32*N5 + 16* N4 + 8*N3 + 4*N2 + 2*N1 + N0
Control Data Byte (CD4):
Charge Pump Current select:
C1 C0 Typ. current in (uA)
0 0 155
0 1 330
1 0 690
1 1 1450
Default state in power up: 00
Control Data byte (CD7):
Test Mode (T3, T2, T1 & T0)
Mode T3 T2 T1 T0
Normal Operation 0 0 0 0
AGC sink Iagc= -100uA 0 0 1 0
AGC source Iagc= 10uA,
P0=output of AGC bias DAC
0 0 1 1
Default state in power up: 0000