max9742 Maxim Integrated Products, Inc., max9742 Datasheet - Page 12

• Manufacturer Part Number: max9742
• Description: Max9742 Single-/dual-supply, Stereo 16w, Class D Amplifier With Differential Inputs
• Manufacturer: Maxim Integrated Products, Inc.

Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
12
12
27, 28, 36
1, 6, 18,
PIN
2, 3
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______________________________________________________________________________________
10
11
12
13
14
15
16
17
19
20
21
22
23
4
5
7
8
9
REFCUR
NSENSE
BOOTL
REGLS
NAME
REGM
SHDN
OUTL
REGP
LGND
LV
INR+
INL+
N.C.
SUB
INL-
FBR
INR-
FBL
MID
SFT
DD
No Connection. Not internally connected.
Left Speaker Output
Device Substrate. Connect SUB to V
Left-Channel Bootstrap Capacitor Terminal. Connect a 0.1µF capacitor between BOOTL and OUTL.
Left-Channel Positive Input
Left-Channel Negative Input. Connect an external feedback capacitor between INL- and FBL. See the
Feedback Capacitor (C
Left-Channel Feedback Capacitor Terminal. Connect an external feedback capacitor between FBL and
INL-. See the Feedback Capacitor (C
-5V Internal Regulator Output. Regulator output voltage is with respect to MID. Bypass REGM with a 1µF
capacitor to signal ground plane (SGND). See the Supply Bypassing/Layout section.
Midsupply Bias Voltage Input. The MID input biases the internal preamplifiers to the average value of the
V
single-supply operation, apply a voltage to MID equal to 0.5 x V
divider and decoupling network (see the Setting V
Circuits/Functional Diagrams and Supply Bypassing/Layout sections.
5V Internal Regulator Output. Regulator output voltage is with respect to MID. Bypass REGP with a 1µF
capacitor to the signal ground plane (SGND). See the Supply Bypassing/Layout section.
Reference Current Resistor Terminal. Connect an external resistor from REFCUR to REGP to set the
switching frequency and output short-circuit current-limit value. Use resistor values greater than or equal
to 58kΩ and less than or equal to 75kΩ. See the Setting the Switching Frequency and Output Current
Limit (R
Soft-Start Capacitor Terminal/Mute Input. Connect a 0.22µF capacitor between SFT and PGND to utilize
the soft-start power-up sequence. Drive SFT low to mute the outputs.
Logic Ground. Connect LGND to signal ground (SGND) and power ground (PGND) planes. See the
Supply Bypassing/Layout section.
Internal 5V Logic Supply. Bypass LV
Active-Low Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low to place the device
into shutdown mode.
Right-Channel Feedback Capacitor Terminal. Connect an external feedback capacitor between FBR and
INR-. See the Feedback Capacitor (C
Right-Channel Negative Input. Connect an external feedback capacitor between INR- and FBR. See the
Feedback Capacitor (C
Right-Channel Positive Input
Negative Supply Sense Input. NSENSE is internally connected to V
between NSENSE and REGLS.
7V Internal Regulator Output. REGLS output voltage is with respect to V
capacitor to NSENSE.
DD
and V
REF
SS
) section.
supply inputs. For dual-supply operation, connect to the signal ground plane (SGND). For
FB_
FB_
) section.
) section.
SS
DD
FB_
FB_
.
to LGND with a 0.1µF capacitor.
) section.
) section.
FUNCTION
MID
section). See the Typical Application
DD
SS
through an external resistive voltage-
. Connect a 1µF bypass capacitor
SS
. Bypass REGLS with a 1µF
Pin Description