TDA8042M Просмотр технического описания (PDF) - Philips Electronics

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TDA8042M

Quadrature demodulator

Philips Electronics 

Philips Semiconductors

Quadrature demodulator

Product specification

TDA8042M

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

Oscillator

fosc

∆fosc

Nosc

Vosc(dis)

oscillator frequency

frequency drift

oscillator phase noise

oscillator disable voltage at pin 17

oscillator disabled

oscillator enabled

note 9

175 −

note 10

−

−

∆VCC = ±5%

−

−

measured10 kHz −

−

from fosc; note 11

−

−

4.0

−

325 MHz

500 kHz

100 kHz

91

dBc/Hz

1.0

V

−

V

Prescaler

VOH

VOL

δ

DIVspu(IQ)

HIGH level output voltage

LOW level output voltage

output duty cycle

output spurious voltage at I and Q outputs

note 12

note 12

note 13

4.0

−

−

V

−

−

3.35 V

40

50

60

%

−

−50 −

dB

I and Q internal filters

B−1

bandwidth for 1 dB attenuation

B−30

bandwidth for 30 dB attenuation

30

−

−

−

450 −

MHz

MHz

I and Q output amplifiers

VO(IQ)(DC)

Vo(IQ)(p-p)

I and Q channels DC output voltage

I and Q channels output voltage

(peak-to-peak value)

note 14

−

2.45 −

V

−

0.8

−

V

Vclip(p-p)

RL(IQ)

Ro(IQ)

αct(I-Q)

I and Q output clipping level

(peak-to-peak value)

I and Q channels output load resistance

I and Q channels output resistance

crosstalk between I and Q channels

note 15

1.8

V

500 −

−

Ω

−

67

−

Ω

30

−

−

dB

Notes

1. The voltage gain control range (GVAGC) is defined as the DC voltage to be applied on pin 3 to get a signal level of

800 mV (peak-to-peak value) at I and Q outputs.

The lowest control voltage corresponds to the highest sensitivity and gain.

2. Vth is the level of voltage to be applied at pin 20 to get a current Idet of 0.5 mA at pin 1. This voltage depends on the

amplitude of the signal at I and Q outputs.

The AGC threshold voltage can be set by a resistive voltage divider connected at pin 20. Without the external

resistors Vth is set at a value close to 2.35 V.

3. The current Idet increases when the output level (at pins 4 and 9) increases above the value set by the adjustment of

Vth.

4. The phase error is defined as the phase quadrature imbalance between I and Q channels.

5. The gain error is defined as the phase quadrature imbalance between I and Q channels.

6. The tilt is defined as the difference between the maximum and the minimum channel gain measured in a frequency

band of ±30 MHz around fi(RF). The specified tilt is the maximum tilt value found in one of the I and Q channels.

1997 Apr 11

7

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