Manual

MAX9670/MAX9671
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AC-COUPLED INPUT
Sync-Tip Clamp Level V
CLP
Sync-tip clamp -13 -4 +6 mV
Sync Crush
S ync- ti p cl am p ; p er centag e r ed ucti on i n
sync p ul se ( 0.3V
P - P
) ; g uar anteed b y i np ut
cl am p i ng cur r ent m easur em ent, T
A
= + 25° C
2%
Input Clamping Current Sync-tip clamp, V
IN
= 0.3V, T
A
= +25°C 1 2 µA
Maximum Input Source
Resistance
Input sync-tip circuit must be stable even if
the source resistance is as high as 300Ω
300 Ω
Bias circuit 0.57 0.6 0.63
Input Voltage
High-impedance input circuit
0.3 x
V
VID
0.36 x
V
VID
V
Bias circuit 10
Input Resistance
High-impedance input circuit 222
kΩ
DC CHARACTERISTICS
DC Voltage Gain Av Guaranteed by output voltage swing 1.95 2 2.05 V/V
DC Gain Mismatch Among R, G,
and B Outputs
Guaranteed by output voltage swing of
TV_R/C_OUT, TV_G_OUT, and TV_B_OUT;
first input signal set is VCR_R/C_IN,
VCR_G_IN, and VCR_B_IN; second signal
set is ENC_R/C_IN, ENC_G_IN, and
ENC_B_IN
-2 +2 %
Sync-tip clamp (V
IN
= V
CLP
) 0.1 0.30 0.51
Output Level
Bias circuit 1.3 1.5 1.78
V
Sync-tip clamp, measured at output,
V
VID
= 3V, V
IN
= V
CLP
to (V
CLP
+1.15V),
R
L
= 150Ω to V
VID
/2, R
L
= 75Ω to GNDVID
2.3
Measured at output, V
VID
= 3.135V, V
IN
=
V
CLP
to (V
CLP
+ 1.15V), R
L
= 150Ω to
V
VID
/2, R
L
= 75Ω to GNDVID
2.243 2.3 2.358
Bias circuit, measured at output, V
VID
= 3V,
V
IN
= (V
BIAS
- 0.575V) to (V
BIAS
+ 0.575V),
R
L
= 150Ω to V
VID
/2, R
L
= 75Ω to GNDVID
2.3
Output Voltage Swing
Measured at output, V
VID
= 3.135V,
V
IN
= (V
BIAS
- 0.575V) to (V
BIAS
+ 0.575V),
R
L
= 150Ω to V
VID
/2, R
L
= 75Ω to GNDVID
2.243 2.3 2.358
V
P-P
Output Short-Circuit Current 100 mA
Output Resistance R
OUT
0.5 Ω
Output Leakage Current Output disabled (load detection not active) 170 µA
Power-Supply Rejection Ratio 3V ≤ V
VID
≤ 3.6V 35 dB
ELECTRICAL CHARACTERISTICS (continued)
(V
12
= 12V, V
VID
= V
AUD
= 3.3V, V
GNDVID
= V
EP
= 0V, no load, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)