TEF6730AHW/V1,557 Datasheet TEF6730AHW/V1S,518, TEF6730AHW/V1S,557, TEF6730AHW/V1,518 | P7-P9

Product data sheet Rev. 01 — 21 February 2007 7 of 58

NXP Semiconductors

TEF6730A

Front-end for digital-IF car radio

FMMIXOUT2 10 FM mixer IF output 2 (10.7 MHz)

AMMIXOUT1 11 AM mixer IF output 1 (10.7 MHz)

CC(RF)

12 AM/FM RF supply voltage

V50LNA 13 AM LNA supply voltage decoupling

LNAIN 14 AM LNA input

AGCCNTRL 15 AM LNA AGC pin

i.c. 16 internally connected; leave open

LNAOUT 17 AM LNA output

i.c. 18 internally connected; leave open

LNAAGCDEC 19 AM LNA AGC decoupling

AMMIXDEC 20 AM mixer decoupling

AMMIXIN 21 AM mixer input

TAMAGC 22 AM RF AGC time constant

PINAGCDEC 23 AM PIN diode AGC decoupling

IAMAGC 24 AGC current for AM PIN diode

RFGND 25 RF ground

FMMIXIN1 26 FM mixer input 1

FMMIXIN2 27 FM mixer input 2

WXMIXIN 28 weather band mixer input

WXMIXDEC 29 weather band mixer decoupling

IFMAGC 30 AGC current for FM PIN diode

TFMAGC 31 FM RF AGC time constant

DAAOUT1 32 antenna DAA output 1

DAAOUT2 33 antenna DAA output 2

KAGC 34 level input for FM keyed AGC function

VTUNE 35 tuning voltage input antenna DAA

CPOUT 36 charge pump output

CC(PLL)

37 tuning PLL supply voltage

VCOGND 38 VCO ground

OSCFDB 39 VCO feedback

OSCTNK 40 VCO tank circuit

CC(VCO)

41 VCO supply voltage

SWPORT 42 software controllable port output

AFSAMPLE 43 AF sample ﬂag output

AFHOLD 44 AF hold ﬂag output and input

FGND 45 reference frequency ground

ADDR2 46 address select input 2

ADDR1 47 address select input 1

i.c. 48 internally connected; leave open

i.c. 49 internally connected; leave open

SDA 50 I

C-bus data line input and output

Table 3. Pin description

…continued

Symbol Pin Description

Product data sheet Rev. 01 — 21 February 2007 8 of 58

NXP Semiconductors

TEF6730A

Front-end for digital-IF car radio

7. Functional description

7.1 FM mixer 1

The FM quadrature mixer converts FM RF (65 MHz to 108 MHz) to an IF frequency of

10.7 MHz. The FM mixer provides high image rejection, a large dynamic range and

selectable mixer gain. The image rejection can be selected between low injection of LO

and high injection of LO via the I

C-bus independently of the band selection. A separate

RF input for weather band is available.

7.2 FM RF AGC

AGC detection is at the FM front-end mixer input and the AM/FM IF AGC ampliﬁer input,

both with programmable AGC thresholds. When the threshold is exceeded, the PIN diode

drive circuit sources a current to an external PIN diode circuit, keeping the RF signal level

constant.

Keyed AGC function is selectable via the I

C-bus and uses the in-band level information

from the IF DSP.

The AGC PIN diode drive circuit can optionally deliver a ﬁxed current as a local function.

In AM mode, the AGC PIN diode drive circuit can be set to generate a ﬁxed source current

into the external FM PIN diode circuitry.

7.3 Antenna DAA1 and DAA2

The antenna DAA1 measures the VCO tuning voltage and multiplies it with a factor

deﬁned by the 7-bit DAA1 setting to generate a tuning voltage for the FM antenna tank

circuit. If a second FM tank circuit is applied, the tuning voltage can be derived from the

antenna DAA2 output. The antenna DAA2 measures the output voltage of the antenna

DAA1 and multiplies it with a factor deﬁned by the 4-bit DAA2 setting.

SCL 51 I

C-bus clock line input

DGND 52 digital ground

FREF1 53 reference frequency input 1

FREF2 54 reference frequency input 2

VREF 55 reference voltage noise decoupling

GND 56 ground

57 supply voltage (8.5 V)

IFOUT1 58 IF AGC ampliﬁer output 1

IFOUT2 59 IF AGC ampliﬁer output 2

IFAGCMSB 60 MSB input for IF AGC ampliﬁer gain setting

IFAGCLSB 61 LSB input for IF AGC ampliﬁer gain setting

CC(IF)

62 IF AGC ampliﬁer supply voltage

IFGND 63 IF AGC ampliﬁer ground

IFAGCBIAS 64 bias voltage decoupling for IF AGC ampliﬁer

Table 3. Pin description

…continued

Symbol Pin Description

Product data sheet Rev. 01 — 21 February 2007 9 of 58

NXP Semiconductors

TEF6730A

Front-end for digital-IF car radio

7.4 AM LNA

The AM low noise ampliﬁer is fully integrated.

7.5 AM RF AGC

The AM RF AGC is partially integrated. Detection is at the output of the AM LNA and at

the input of the AM/FM IF AGC ampliﬁer, both with programmable thresholds. First the

integrated AGC reduces the gain of the LNA. After the LNA AGC, the PIN diode AGC

takes over by sinking a current via an external PIN diode.

In FM mode, the AM AGC can be set to a ﬁxed attenuation.

7.6 AM mixer

The large dynamic range AM mixer converts AM RF (144 kHz to 26.1 MHz) to an IF

frequency of 10.7 MHz.

7.7 VCO and dividers

The varactor tuned LC oscillator together with the dividers provides the LO signal for both

AM and FM front-end mixers. The VCO has an operating frequency of approximately

160 MHz to 256 MHz. In FM mode the LO frequency is divided by 2 or 3. These dividers

generate in-phase and quadrature-phase output signals used in the FM front-end mixer

for image rejection. In weather band mode the LO signal is directly phase shifted to

generate the in-phase and quadrature-phase signals. In AM mode the LO frequency is

divided by 6, 8, 10, 16 or 20 depending on the selected AM band.

7.8 Tuning PLL

The tuning PLL locks the VCO frequency divided by the programmable divider ratio to the

reference frequency. Due to the combination of different charge pump signals in the

PLL loop ﬁlter, the loop parameters are adapted dynamically. Tuning to different

RF frequencies is done by changing the programmable divider ratio. The tuning step size

is selected with the reference frequency divider setting.

7.9 AM/FM IF AGC ampliﬁer

The combined AM/FM IF AGC ampliﬁer delivers a suitable IF signal for the ADC in the

IF DSP. The maximum gain of the IF AGC ampliﬁer can be selected via the I

C-bus. The

gain of this ampliﬁer is automatically adapted via interfacing signals from the IF DSP. The

IF AGC ampliﬁer has three signal inputs, two for FM and one for AM. This allows the

application of multiple external ﬁlters, e.g. with different bandwidths.

8. I

C-bus protocol

Fig 3. Write mode

ACK-s ACK-s

DATASLAVE ADDRESS W

data transferred

(n bytes + acknowledge)

001aad051

PS ACK-s

MSA

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TEF6730AHW/V1,557

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TEF6730AHW/V1,557

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