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SN761672ADARG4 Datasheet(PDF) 9 Page - Texas Instruments |
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SN761672ADARG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page SN761672A TV/VCR TUNER IC SLLS437 – JANUARY 2001 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 function description The device can be controlled according to the I2C bus format. Table 1. Serial Interface Function PIN PIN NAME FUNCTION 17 SCL Clock input 18 SDA Data input/output 19 AS Address selection input 20 ADC ADC input/test output I2C bus mode I2C write mode (R/W = 0) Table 2. Write Data Format MSB LSB ACKNOWLEDGE Address byte (ADV) 1 1 0 0 0 MA1 MA0 R/W 0 A Divider byte 1 (DB1) 0 N14 N13 N12 N11 N10 N9 N8 A Divider byte 2 (DB2) N7 N6 N5 N4 N3 N2 N1 N0 A Control byte (CB) 1 CP T2 T1 T0 RSA RSB OS A Band switch byte (BB) X X X X BS4 BS3 BS2 BS1 A Table 3. Description of Data Symbol SYMBOL DESCRIPTION DEFAULT MA1, MA0 Address set bits (see Table 4) N14...N0 Programmable counter set bits N=N14*2^14+N13*2^13+...+N1*2+N0 Nn = 0 CP Charge pump current set bit 60 µA (CP=0) 280 µA (CP=1) CP = 1 T2, T1, T0 Test bits (see table 5) Normal Mode: T2=0, T1=0, To=1/0 T2=0, T1=0, T0=1 RSA, RSB Reference divider ratio selection bits (see Table 6) RSA=0, RSB=1 OS Tuning amplifier control bit Tuning voltage on (OS=0) Tuning voltage off, high impedance (OS=1) OS=0 BS4...BS1 Band switch ports control bits BSn=0:OFF BSn=1:ON Band selection by BS1,2,4 (X = don’t care) BSn=0 BS1 BS2 BS4 VHF-LO 1 0 0 VHF-HI X 1 0 UHF X X 1 X Don’t care Table 4. Address Selection VOLTAGE APPLIED ON CE INPUT MA1 MA0 0 V to 0.1 VCC 0 0 Always valid 0 1 0.4 VCC to 0.6 VCC 1 0 0.9 VCC to VCC 1 1 |
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