TDA8046 Datasheet, PDF (38/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator

Philips Semiconductors
Multi-mode QAM demodulator
Product specification
TDA8046
13 CLOCK RECOVERY CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN.
Clock recovery detector
CLOCK RECOVERY: BIAS CURRENT FOR DACS SET TO 37.5 µA
K_d
detector constant
SNR = 21 dB for
64-QAM constellation;
SNR = 27 dB for
256-QAM constellation
∆f_CLK
f_n
I_CLK(max)
frequency range
natural frequency
maximum DAC output current
(programmable)
f_DAC
DAC sample rate
CLOCK RECOVERY DAC output currents
I_oCLKlock
∆I_oCLKlock
mean output current
matching of output currents
−
100
−
50
−
−
−2.5
TYP.
0.24I_CLK
−
400
−
r_s
I_CLK
−
MAX.
−
−
−
200
−
−
+2.5
UNIT
µA/rad
ppm
Hz
µA
MHz
µA
%
14 AGC CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
AGC detector
AGC DETECTOR: BIAS CURRENT FOR DACS SET TO 37.5 µA
∆R_AGC
AGC range of detector
I_zero
zero current
I_AGC(max)
maximum DAC output current
(programmable)
f_DAC
DAC sample rate
AGC DAC output currents
I_oAGC
∆I_oAGC
mean output current
matching of output current
in lock
unlock
MIN.
TYP.
MAX. UNIT
±20
−100
50
−
−
−
−5
−
−
−
+100
−
200
r_s
−
1_⁄14IAGC
−
I_AGC
−
+5
dB
nA
µA
MHz
µA
µA
%
1996 Nov 19
38