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PDF CXA2078Q Data sheet ( Hoja de datos )
| Número de pieza | CXA2078Q | |
| Descripción | I2C Bus-Compatible Audio/Video Switch with Electronic Volume | |
| Fabricantes | Sony Corporation | |
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CXA2078Q
I2C Bus-Compatible Audio/Video Switch with Electronic Volume
Description
The CXA2078Q is an I2C programmable audio,
video switch designed for set top box applications. It
interfaces from digital encoder sources to TV, VCR
and auxilliary scart connectors.
Features
• 3 scart independent audio/video switching (TV, VCR,
AUX)
• 0 to –63dB volume control with click noise reduction
• 5 stereo audio inputs
• I2C control with two address setting
• Scart Function Switching input and output
• Scart Fast Blanking for OSD
• RF modulator output with Y/C mix option
• On-chip +12V to +9V voltage regulator
• 4 logic outputs
Applications
Audio/Video switch featuring I2C bus compatibility
for set top box
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage
VCC
• Operating temperature Topr
• Storage temperature Tstg
• Allowable power dissipation
PD
12
–20 to +75
–65 to +150
500
V
°C
°C
mW
Operating Conditions
• Supply voltage
• Operating voltage
+10.7 to +12
9 ± 0.5
V
V
64 pin QFP (Plastic)
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E97843-PS
1 page  
Pin
No.
Symbol
Pin
voltage
34 MONO
4.5V
CXA2078Q
Equivalent circuit
VCC = 12V
VCC = 9V
75µA
200
34
200 20k
75µA
Description
Audio mono signal output.
3
BIAS_
VIDEO
3.9V
VCC = 12V
11k
3
200
9k
VCC = 9V
14µA
Reference Bias for video
circuit.
Connected to GND with
capacitor.
23
BIAS_
AUDIO
4.5V
VCC = 12V
20k
23
20k
VCC = 9V
7µA
Reference Bias for audio
circuit.
Connected to GND with
capacitor.
37 FNC_TVB
38 FNC_TVA
—
VCC = 12V
37
38 20k
VCC = 9V
40k
2.7V
I2C controlled output
giving 0/2V.
Maximum load current
= 800µA
–5–
5 Page 
CXA2078Q
Electrical Characteristics
Audio system
Unless otherwise stated: input coupling capacitor 1µF in series with 6kΩ resistor; output coupling capacitor of
10µF; load of 10kΩ.
Nominal conditions (Ta = 25°C, Vcc_12V = 12V)
Item Symbol
Input pin voltage
VAPIN
R/LOUT1, 2 GVA
Gain
RTV, LTV GVATV
MONO
GVAM
Audio frequency
response
FAF
Frequency B/W
FBWA1
Distortion
THD
Input Dynamic Range
Cross talk
(Channel separation)
VdA
VctA
Ripple
rejection
R/LOUT1, 2 RRA
RTV, LTV RRATV
MONO
RRAM
DC Offset -R/Lout1, 2
Input impedance
Output Impedance
Voff
Zin
Zout
Phase Difference
Vpda
S/N ratio
S/NA
Electronic Volume Control
Fine volume attenuation
step
AEVC
Coarse volume
attenuation step
AEVF
Mute
Amute
DC Offset -RTV, LTV
VoffTV
Conditions
No signal, no load (Fig. 5)
f = 1kHz, 1Vrms input. (Fig. 6)
f = 1kHz, 1Vrms input. (Fig. 6)
f = 1kHz, 1Vrms "stereo" input. (Fig. 6)
0.3Vp-p input. Output level at 30kHz
with 1kHz serving as 0dB. 6kΩ
removed. (Fig. 7)
0.3Vp-p input; frequency where output
level is –3dB with 1kHz serving as
0dB. 6kΩ removed. No load (Fig. 7)
f = 1kHz, 0.5Vrms, unweighted
response; LPF @400Hz,
HPF @ 80KHz. (Fig. 6)
f = 1kHz (Fig. 6)
f = 1kHz, 1Vrms input on one input,
measure on any other audio output.
(Fig.6)
f = 100Hz, 0.3Vp-p applied to Vcc_aud
(Fig. 8)
f = 100Hz, 0.3Vp-p applied to Vcc_aud
(Fig. 8)
f = 100Hz, 0.3Vp-p applied to Vcc_aud
(Fig. 8)
Offset voltage between any audio input
and R/Lout1, 2 (Fig. 5)
(excluding series external 6kΩ)
(excluding any external series resistor)
f = 1kHz, 1Vrms input to two channels.
Phase difference of stereo output
measured
f = 1kHz, 1Vrms input (at maximum
volume).
HPF @ 20Hz, LPF @ 20kHz. (Fig. 6)
f = 1kHz, 0.5Vrms input. Set by I2C
(Fig.6)
f = 1kHz, 0.5Vrms input. Set by I2C
(Fig.6)
f = 1kHz, 1Vrms input. (Fig.6)
Offset voltage between any audio input
and RTV, LTV outputs (Fig.5)
Min. Typ. Max. Unit
4.2 4.5 4.8 V
–0.5 0 +0.5 dB
–0.65 0 +0.35 dB
–0.65 0 +0.45 dB
–0.3 0 +0.3 dB
— 1 — MHz
— 0.004 0.2 %
2 — — Vrms
— –88 –76 dB
— –62 — dB
— –75 — dB
— –44 — dB
–30 +2 +30 mV
48 60 72 kΩ
— 10 — Ω
— 0.05 — Deg
72 95 — dB
0.6 1 1.4 dB
7.5 8 8.5 dB
>80 dB
–30 +2 +30 mV
– 11 –
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CXA2078Q.PDF ] | |
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