EVALUATION KIT AVAILABLE
MAX13325/MAX13326
Dual Automotive, Audio Line Drivers
2
with I C Control and Diagnostic
General Description
Features
S Comprehensive Programmability and Diagnostics
The MAX13325/MAX13326 dual audio line drivers provide
a reliable differential interface between automotive audio
components. The devices feature differential inputs and
outputs, integrated output diagnostics, and are controlled
using an I2C interface or operate in stand-alone mode.
Using I2C Interface
S Autoretry Function in Stand-Alone Mode
S Drive Capacitive Loads ≤ 3nF Differentially, ≤ 4nF
to Ground
The outputs can deliver up to 4V
into 100Iloads.
RMS
S 112dB Signal-to-Noise Ratio
The MAX13325 buffers analog audio signals for trans-
mission over long cable distances with a fixed gain of
12dB, whereas the MAX13326 provides a 0dB fixed
gain. The diagnostics on the outputs report conditions
on a per channel basis, including short to GND, short
to battery, overcurrent, overtemperature, and excessive
offset. The output amplifiers can drive capacitive loads
up to 4nF to ground and 3nF differentially.
S Low 0.002% THD at 4V
into 2.7kI Loads
RMS
S High PSRR (70dB at 1kHz)
S High CMRR (80dB at 1kHz)
S Low Output Noise (3µV
), MAX13326
RMS
S Excellent Channel-to-Channel Matching
S Load-Dump Transient Protection
S Protected Output Against Various Short-Circuit
The outputs are protected according to IEC 61000-4-2
Q8kV Contact Discharge, and Q15kV Air Gap. The
MAX13325/MAX13326 are specified from -40NC to
+105NC and are available in a 28-pin TSSOP package
with an exposed pad.
Conditions
S ESD Protection for 8kV Contact Discharge,
1ꢀkV Air Gap
S Long-Distance Drive Capability Typically Up to
1ꢀm or Greater
Applications
Automotive Radio and Rear Seat Entertainment
Professional Remote Audio Amplifiers
S Noise-Rejecting Differential Inputs and Outputs
S Low-Power Shutdown Mode < 10µA
S Hardware or Software MUTE Function
S 28-Pin TSSOP Package with Exposed Pad
Typical Operating Circuit
Ordering Information
V
SUP
+12V
PIN-
PACKAGE
GAIN
(dB)
C1
470nF
D2**
* OPTIONAL
PART
TEMP RANGE
C2
1µF
+5V
R1
1kI
Q1
V
C6
100nF
L
CP
CM CHOLD
-40NC to
+105NC
D1
MAX1332ꢀGUI/V+ 28 TSSOP-EP*
MAX13326GUI/V+ 28 TSSOP-EP*
12
0
ADD1
ADD0
SDA
V
DD
CHARGE
PUMP
C3
1µF
-40NC to
+105NC
PGND
2
I
C INTERFACE
AND
DIGITAL CONTROL
SCL
C4
10µF
FLAG
SHDN
MUTE
BIAS
TO
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MICROPROCESSOR
C5
220nF
BIAS
CSS
GND
C7
2.2µF
1nF
OUTLP
OUTLM
INLP
FROM AUDIO
SOURCE
LEFT
1nF
INLM
C8
2.2µF
OUTPUT
DIAGNOSTIC
ESD
PROTECTION
1nF
1nF
C9
2.2µF
OUTRP
OUTRM
INRP
FROM AUDIO
SOURCE
1nF
RIGHT
INRM
C10
2.2µF
1nF
MAX13325
MAX13326
*OPTIONAL : NEEDED FOR AUTOMOTIVE LOAD DUMP PROTECTION ONLY
**USE D2 WHEN CHARGE PUMP IS OFF AND EXTERNAL SUPPLY IS PROVIDED TO C HOLD
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5136; Rev 5; 4/13