MAX7031MATJ50+T【PDF 13/20 页】IC TXRX FSK W/PLL 32TQFN-EP

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Low-Cost, 308MHz, 315MHz, and 433.92MHz

FSK Transceiver with Fractional-N PLL

MAX7031

MAX7031

DATA

DATA

SLICER

DS-

DS+

DATA

SLICER

PEAK

DET

PEAK

DET

R

DATA

PDMAX

R

R

PDMIN

C

C

C

Figure 3. Generating Data Slicer Threshold Using a Lowpass

Filter

generates a 100mV P-P signal on the control line. This

control voltage is then filtered and sliced by the base-

band circuitry.

The FSK demodulator PLL requires calibration to over-

come variations in process, voltage, and temperature.

This is done by cycling the ENABLE pin when the

Figure 4. Generating Data Slicer Threshold Using the Peak

Detectors

and a rolloff rate of 40dB/decade for the two-pole filter.

The Bessel filter has a linear phase response, which

works well for filtering digital data. To calculate the

value of the capacitors, use the following equations,

along with the coefficients in Table 2:

AUTOCAL pin is a logic 1. If the AUTOCAL pin is a

logic 0, calibration cannot occur.

Data Filter

The data filter for the demodulated data is implemented

as a 2nd-order, lowpass Sallen-Key filter. The pole

C F 1 =

C F 2 =

b

a ( 100 k ? )( π )( f c )

a

4 ( 100 k ? )( π )( f c )

locations are set by the combination of two on-chip

resistors and two external capacitors. Adjusting the

value of the external capacitors changes the corner fre-

quency to optimize for different data rates. Set the cor-

where f C is the desired 3dB corner frequency.

For example, choose a Butterworth filter response with

a corner frequency of 5kHz:

ner frequency in kHz to approximately 2 times the

fastest expected Manchester data rate in kbps from the

transmitter (1.0 times the fastest expected NRZ data

C F 1 =

1 . 000

( 1 . 414 )( 100 k ? )( 3 . 14 )( 5 kHz )

≈ 450 pF

C F 2 = ≈ 225 pF

rate). Keeping the corner frequency near the data rate

rejects any noise at higher frequencies, resulting in an

increase in receiver sensitivity.

The configuration shown in Figure 2 can create a

Butterworth or Bessel response. The Butterworth filter

offers a very-flat-amplitude response in the passband

1 . 414

( 4 )( 100 k ? )( 3 . 14 )( 5 kHz )

Choosing standard capacitor values changes C F1 to

470pF and C F2 to 220pF. In the Typical Application

Circuit , C F1 and C F2 are named C16 and C17,

respectively.

Table 2. Coefficients to Calculate C F1

and C F2

FILTER TYPE

Butterworth

(Q = 0.707)

Bessel

(Q = 0.577)

a

1.414

1.3617

b

1.000

0.618

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