TDA8594
I
2
C-bus controlled 4
50 W power amplifier
Rev. 5 — 11 June 2013
Product data sheet
1. General description
The TDA8594 is a complementary quad Bridge Tied Load (BTL) audio power amplifier
made in BCDMOS technology. It contains four independent amplifiers in BTL
configuration. Through the I
2
C-bus, diagnosis of temperature warning and clipping level is
fully programmable and the information available via two diagnostic pins is selectable.
The status of each amplifier (output offset, load or no load, short-circuit or speaker
incorrectly connected) can be read separately.
2. Features and benefits
2.1 General
Operates in legacy mode (non I
2
C-bus) and I
2
C-bus mode (3.3 V and 5 V compliant)
Three hardware-programmable I
2
C-bus addresses
Drives 4
or 2
loads
Speaker fault detection
Independent short-circuit protection per channel
Loss of ground and open V
P
safe (with 200 m series impedance and a supply
decoupling capacitor of 2200
F
maximum)
All outputs short-circuit proof to ground, supply voltage and across the load
All pins short-circuit proof to ground
Temperature-controlled gain reduction to prevent audio holes at high junction
temperatures
Low battery voltage detection
Offset detection
This part has been qualified in accordance with AEC-Q100
2.2 I
2
C-bus mode
DC load detection: open-circuit, short-circuit and load present
AC load (tweeter) detection
During start-up, can detect which load is connected so the appropriate gain can be
selected without audio pop
Independently selectable soft mute of front channels (channel 1 and channel 3) and
rear channels (channel 2 and channel 4)
Programmable gain (26 dB and 16 dB) of front channels (channel 1 and channel 3)
and rear channels (channel 2 and channel 4)
NXP Semiconductors
TDA8594
I
2
C-bus controlled 4
50 W power amplifier
Fully programmable diagnostic levels can be set:
Programmable clip detection: 2 %, 5 % or 10 %
Programmable thermal pre-warning
Selectable information on the DIAG and STB pins:
The STB pin can be programmed/multiplexed with second clip detection
Clip information of each channel can be directed separately to the DIAG pin or the
STB pin
Independent enabling of thermal, clip or load fault detection (short across or to V
P
or to ground) on DIAG pin
3. Quick reference data
Table 1.
Symbol
V
P
I
q
P
o
Quick reference data
Parameter
supply voltage
quiescent current
output power
Conditions
R
L
= 4
no load
V
P
= 14.4 V
R
L
= 4
;
THD = 0.5 %
R
L
= 4
;
THD = 10 %
R
L
= 4
;
maximum
power; V
i
= 2 V (RMS)
square wave
R
L
= 2
;
maximum
power; V
i
= 2 V (RMS)
square wave
THD
V
n(o)
total harmonic
distortion
output noise voltage
R
L
= 4
;
f = 1 kHz;
P
o
= 1 W to 12 W
filter 20 Hz to 22 kHz;
R
S
= 1 k
normal mode
line driver mode
-
-
45
22
65
29
V
V
19
26
42
22
28
44
-
-
-
W
W
W
Min
8
-
Typ
14.4
270
Max
18
400
Unit
V
mA
70
75
-
W
-
0.01
0.1
%
4. Ordering information
Table 2.
Ordering information
Package
Name
TDA8594J
TDA8594SD
DBS27P
RDBS27P
Description
plastic DIL-bent-SIL (special bent) power package;
27 leads (lead length 6.8 mm)
plastic rectangular-DIL-bent-SIL (reverse bent) power
package; 27 leads (row spacing 2.54 mm)
Version
SOT827-1
SOT878-1
Type number
TDA8594
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 11 June 2013
2 of 49
NXP Semiconductors
TDA8594
I
2
C-bus controlled 4
50 W power amplifier
5. Block diagram
ADSEL SDA
1
SCL
23
V
P1
21
V
P2
7
26
STB
2
STANDBY/
FAST MUTE
I
2
C-BUS
INTERFACE
5
CLIP DETECT/DIAGNOSTIC
DIAG
IN1
12
MUTE
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
10
8
OUT1+
OUT1−
IN3
16
MUTE
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
18
20
OUT3+
OUT3−
IN2
13
MUTE
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
6
4
OUT2+
OUT2−
IN4
15
V
P
MUTE
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
22
24
OUT4+
OUT4−
27
TAB
TDA8594
11
SVR
14
SGND
17
ACGND
9
PGND1
3
PGND2
19
PGND3
25
PGND4
001aad119
Fig 1. Block diagram
TDA8594
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 11 June 2013
3 of 49
NXP Semiconductors
TDA8594
I
2
C-bus controlled 4
50 W power amplifier
6. Pinning information
6.1 Pinning
ADSEL
STB
PGND2
OUT2−
DIAG
OUT2+
V
P2
OUT1−
PGND1
1
2
3
4
5
6
7
8
9
OUT1+ 10
SVR 11
IN1 12
IN2 13
SGND 14
IN4 15
IN3 16
ACGND 17
OUT3+ 18
PGND3 19
OUT3− 20
V
P1
21
OUT4+ 22
SCL 23
OUT4− 24
PGND4 25
SDA 26
TAB 27
TDA8594
001aad120
Fig 2. Pin configuration
6.2 Pin description
Table 3.
Symbol
ADSEL
STB
PGND2
OUT2
DIAG
OUT2+
V
P2
TDA8594
Pin description
Pin
1
2
3
4
5
6
7
Description
I
2
C-bus address select input
standby (I
2
C-bus mode) or mode pin (legacy mode); programmable second
clip indicator
power ground channel 2
negative channel 2 output
diagnostic/clip detection output
positive channel 2 output
supply voltage 2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 11 June 2013
4 of 49
NXP Semiconductors
TDA8594
I
2
C-bus controlled 4
50 W power amplifier
Pin description
…continued
Pin
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Description
negative channel 1 output
power ground channel 1
positive channel 1 output
half supply filter capacitor
channel 1 input
channel 2 input
signal ground
channel 4 input
channel 3 input
AC ground input
positive channel 3 output
power ground channel 3
negative channel 3 output
supply voltage 1
positive channel 4 output
I
2
C-bus clock input
negative channel 4 output
power ground channel 4
I
2
C-bus data input/output
heatsink connection, must be connected to ground
Table 3.
Symbol
OUT1
PGND1
OUT1+
SVR
IN1
IN2
SGND
IN4
IN3
ACGND
OUT3+
PGND3
OUT3
V
P1
OUT4+
SCL
OUT4
PGND4
SDA
TAB
To keep the output pins on the front side, special reverse bending is applied.
7. Functional description
The TDA8594 is a complementary quad BTL audio power amplifier made in BCDMOS
technology. It contains four independent amplifiers in BTL configuration (see
Figure 1).
Through the I
2
C-bus, the diagnostic functions of temperature level and clip level are fully
programmable and the information to be shown on the two diagnostic pins can be
selected. The status of each amplifier (output offset, load or no load, short-circuit or
speaker incorrectly connected) can be read separately. The TDA8594 is protected against
overvoltage, short-circuit, over-temperature, open ground and open V
P
connections.
Three different I
2
C-bus addresses are selected with an external resistor connected to the
ADSEL pin. If the ADSEL pin is short-circuit to ground, the TDA8594 operates in legacy
mode. In this mode, no I
2
C-bus is needed and the function of the STB pin will change from
two-level (Standby mode and On mode) to a three-level pin (Standby mode, On mode and
mute).
7.1 Input stage
The input stage is a high-impedance pseudo-differential input stage. The negative inputs
of the four channels are combined on the ACGND pin. For the best performance on
supply voltage ripple rejection and pop noise, the capacitor connected to the ACGND pin
must be four times the value of the input capacitor (or as close to the value as possible).
TDA8594
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 11 June 2013
5 of 49
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