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TDA8050A

QPSK transmitter

Philips Electronics 

Philips Semiconductors

QPSK transmitter

Product specification

TDA8050A

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

Crystal oscillator

fxtal

Zi

Vi(DC)

crystal frequency

input impedance

DC input level

note 3

fxtal = 4 MHz

Modulator synthesizer

fref(mod)

RDR1

reference frequency

programmable reference divider

ratio

ND1

fix main divider ratio

I(cp)

charge-pump current

fixed

Converter synthesizer

fstep

RD2

step size

fix reference divider ratio

RDR2

programmable reference divider see Tables 4 and 5

ratio

ND2

fix main divider ratio

NDR2

programmable main divider

ratio

see Tables 4 and 5

1

−

4

MHz

600 1200

−

Ω

−

2.9

−

V

−

250

4

−

−

kHz

16

−

1 120

−

−

0.30

−

mA

100 −

−

2

4

−

−

4

290 −

500 kHz

−

160

−

1 800

3-wire bus

VIL

input LOW level

VIH

input HIGH level

−

−

2.4 −

0.8 V

−

V

Lock detect pin

VO(lock)

VO(unlock)

output voltage (LOCK)

output voltage (UNLOCK)

−

5

−

0.02

−

V

−

V

Serial control clock

fclk

tsu

th(CLK)

td(strt)

td(stp)

clock frequency

input data to CLK set-up time

input data to CLK hold time

delay to rising clock edge

delay from last clock edge

see Fig.8

see Fig.8

see Fig.8

see Fig.8

−

330

−

2

−

1

−

3

−

3

−

kHz

−

µs

−

µs

−

µs

−

µs

Notes

1. All specification points of the output section and the overall circuit are measured after the 2 : 1 transformer (Siemens

V944) loaded with 75 Ω.

2. Overall phase noise:

a) Converter: I(cp) = 0.36 mA; fref = 25 kHz.

b) I and Q = 100 mVdif.

c) DAC = 28.

d) f = 65 MHz.

3. The crystal oscillator uses a 4, 2 or 1 MHz crystal in series with a capacitor. The crystal is serial resonant with a load

capacitance of 18 to 20 pF. The connection to VCC is preferred but it might also be to GND.

1999 Nov 05

9

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