TDA9845 查看數據表（PDF） - Philips Electronics
零件编号
产品描述 (功能)
生产厂家
TDA9845 Datasheet PDF : 20 Pages
| |||
Philips Semiconductors
TV and VTR stereo/dual sound processor
with digital identification
Preliminary specification
TDA9845
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
tdet
fident
tintegr
tident(on)
tident(off)
pull-in time of identification
PLL (referenced to
fdet STEREO = 117.48 Hz and
fdet DUAL = 274.12 Hz)
identification window
frequency width (referenced
to fdet STEREO = 117.48 Hz
and fdet DUAL = 274.12 Hz)
integrator time constant
total identification time on
total identification time off
STEREO
DUAL
STEREO; note 6
DUAL; note 6
STEREO; note 7
DUAL; note 7
STEREO; note 8
DUAL; note 8
0
−
0
−
2.2
−
2.3
−
0.94
−
0.35
−
0.35
−
0.60
−
0.60
−
0.8
s
0.8
s
2.2
Hz
2.3
Hz
0.94
s
2.0
s
2.0
s
1.5
s
1.5
s
LED (pins 14 and 15)
VL(off)
VL(on)
IL(off)
IL(on)
output voltage
output voltage
input current
input current
LED off
LED on
LED off
LED on
−
−
8.8
V
−
−
0.7
V
−
−
1
µA
−
−
12
mA
Control input ports C1, C2 and C3 (pins 1, 2 and 20)
VCL
LOW level input voltage
VCH
HIGH level input voltage
ICL
LOW level input current
ICH
HIGH level input current
0
−
2.4
−
−
−
−
−
0.8
V
8.8
V
−1
µA
1
µA
Notes
1. Vo = 0.5 V RMS value; f = 1 kHz.
2. Without de-emphasis capacitors with respect to nominal gain.
3. In dual mode: A (B)-signal into B (A) channel.
In stereo mode: R-signal into left channel; L-signal = 0.
4. Tuner input signal, measured with PCALH reference front end (1⁄2EMF, 75 Ω, 2T/20T/white bar, 100% video) and
PC/SC1 = 13 dB; PC/SC2 = 20 dB. The pilot band-pass has to be aligned.
5. Bandwidth of the pilot BP-filter B−3 dB = 1.2 kHz. Vi 2 input driven with identification-modulated pilot carrier and white
noise.
6. Identification window is defined as twice the pull-in frequency range (lower plus upper side) of identification PLL
(steady detection) plus window increase due to integrator (fluctuating detection).
7. The maximum total system identification time ON is equal to tident(on) plus tacqui AGC.
8. The maximum total system identification time OFF is equal to tident(off).
1995 Mar 20
11
Share Link: 