AUDIO PROCESSOR PART
Input Multiplexer
Quasi-differential CD and cassette stereo input
AM mono input
Phone differential input
Multiplexer signal after In-Gain available at
separate pins
Volume control
1dB attenuator
Max. gain 15dB
Max. attenuation 79dB
Bass Control
2nd order frequency response
Center frequency programmable in 4(5) steps
DC gain programmable
±15 x 1dB steps
Treble Control
2nd order frequency response
Center frequency programmable in 4 steps
±15 x 1dB steps
Speaker Control
4 independent speaker controls in 1dB steps
max gain 15dB
max. attenuation 79dB
Mute Functions
Direct mute
Digitally controlled softmute with 4 programmable
mute time
ELECTRICAL CHARACTERISTICS (V
S
= 9V; T
amb
= 25°C; R
L
= 10KΩ; all gains = 0dB; f = 1KHz;
unless otherwise specified).
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUT SELECTOR
R
in
Input Resistance all inputs except Phone 70 100 130 K
Ω
V
CL
Clipping Level 2.2 2.6 V
RMS
S
IN
Input Separation 80 100 dB
G
IN MIN
Min. Input Gain -1 0 1 dB
G
IN MAX
Max. Input Gain 13 15 17 dB
G
STEP
Step Resolution 0.5 1 1.5 dB
V
DC
DC Steps Adjacent Gain Step -5 0.5 5 mV
G
MIN
to G
MAX
-10 5 10 mV
DIFFERENTIAL CD STEREO INPUT
R
in
Input Resistance Differential 70 100 130 K
Ω
Common Mode 70 100 130 K
Ω
CMRR Common Mode Rejection Ratio V
CM
= 1
VRMS
@ 1KHz 45 70 dB
V
CM
= 1
VRMS
@ 10KHz 45 60 dB
e
N
Output Noise @ Speaker
Outputs
20Hz to 20KHz flat; all stages
0dB
615
µ
V
DIFFERENTIAL PHONE INPUT
R
in
Input Resistance Differential 40 56 K
Ω
CMRR Common Mode Rejection Ratio V
CM
= 1
VRMS
@ 1KHz 40 70 dB
V
CM
= 1
VRMS
@ 10KHz 40 60 dB
TDA7400D
4/28
Obsolete Product(s) - Obsolete Product(s)
