MAX13325_12 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Dual Automotive, Audio Line Drivers with I2C Control and Diagnostic

EVALUATION KIT AVAILABLE
MAX13325/MAX13326
Dual Automotive, Audio Line Drivers
with I²C Control and Diagnostic
General Description
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.
The outputs can deliver up to 4VRMS into 100I loads.
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.
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.
Applications
Automotive Radio and Rear Seat Entertainment
Professional Remote Audio Amplifiers
Typical Operating Circuit
C6
100nF
TO
MICROPROCESSOR
FROM AUDIO
SOURCE
FROM AUDIO
SOURCE
ADD1
ADD0
SDA
SCL
FLAG
SHDN
MUTE
+5V
VL
I2C INTERFACE
AND
DIGITAL CONTROL
C1
470nF
C2
1µF
CP CM CHOLD
CHARGE
PUMP
VSUP
D2**
* OPTIONAL
R1
1kI
D1
VDD
PGND
+12V
Q1
C3
1µF
C4
BIAS
10µF
BIAS
C5
CSS
220nF
GND
C7
2.2µF
INLP
LEFT
INLM
OUTLP ^1nF
1nF
OUTLM
C8
2.2µF
C9
2.2µF
INRP
C10
2.2µF
INRM
RIGHT
OUTPUT
ESD
1nF
DIAGNOSTIC PROTECTION
OUTRP ^1nF
1nF
OUTRM
MAX13325
1nF
MAX13326
*OPTIONAL : NEEDED FOR AUTOMOTIVE LOAD DUMP PROTECTION ONLY
**USE D2 WHEN CHARGE PUMP IS OFF AND EXTERNAL SUPPLY IS PROVIDED TO C HOLD
Features
S Comprehensive Programmability and Diagnostics
Using I²C Interface
S Autoretry Function in Stand-Alone Mode
S Drive Capacitive Loads ≤ 3nF Differentially, ≤ 4nF
to Ground
S 112dB Signal-to-Noise Ratio
S Low 0.002% THD at 4VRMS into 2.7kI Loads
S High PSRR (70dB at 1kHz)
S High CMRR (80dB at 1kHz)
S Low Output Noise (3µVRMS), MAX13326
S Excellent Channel-to-Channel Matching
S Load-Dump Transient Protection
S Protected Output Against Various Short-Circuit
Conditions
S ESD Protection for ±8kV Contact Discharge,
±15kV Air Gap
S Long-Distance Drive Capability Typically Up to
15m or Greater
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
Ordering Information
PART
PIN-
PACKAGE
TEMP RANGE
MAX13325GUI/V+ 28 TSSOP-EP*
-40NC to
+105NC
MAX13326GUI/V+ 28 TSSOP-EP*
-40NC to
+105NC
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
GAIN
(dB)
12
0
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 4; 9/12