TEF6721HL_4 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 04 — 20 December 2005 14 of 48
Philips Semiconductors
TEF6721HL
Car radio tuner front-end for digital IF
[1] X = don’t care.
8.2.6 Write mode: data byte 4
Table 15: FM band selection bits
BND1 BND0 Frequency band VCO divider Charge pump current
0 0 FM standard 2 130 µA+3mA
0 1 FM Japan 3 130 µA+3mA
1 0 FM East Europe 3 1 mA
1 1 FM weather 1 300 µA
Table 16: AM band selection bits
[1]
BND1 BND0 Frequency band VCO divider Charge pump current
0 X AM SW 10 1 mA
1 X AM LW/MW 20 1 mA
Table 17: Format of data byte 4
7 6 5 4 3 2 1 0
KAGC AGC1 AGC0 LODX FMINJ - AGCSW MIXGAIN
Table 18: Description of data byte 4 bits
Bit Symbol Description
7KAGCKeyed FM AGC. If KAGC = 0, then keyed FM AGC is off. If KAGC = 1,
then keyed FM AGC is on.
6 and 5 AGC[1:0] Wideband AGC. These 2 bits set the start value of wideband AGC. For
AM, see
Table 19 and for FM, see Table 20.
4 LODX Local or distance. If LODX = 0, then distance mode is on. If LODX = 1,
then local mode is on.
3 FMINJ FM mixer image rejection. If FMINJ = 0, then low injection. If
FMINJ = 1, then high injection.
2 - This bit is not used and should be set to logic 0.
1 AGCSW AGC switch. If AGCSW = 0, then AM AGC in FM mode and FM AGC in
AM mode is off. If AGCSW = 1, then AM AGC PIN diode drive is active in
FM mode and FM AGC PIN diode drive is active in AM mode.
0 MIXGAIN FM mixer gain. If MIXGAIN = 0, then the FM mixer gain is nominal. If
MIXGAIN = 1, then the FM mixer gain is +6 dB.
Table 19: Setting of wideband AGC for AM (m = 0.3)
AGC1 AGC0 AM mixer input voltage (peak value) (mV)
0 0 275
0 1 375
1 0 500
1 1 625
