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1734709-9

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I
2
C, Volume and Gain Control
_______________________________________________________________________________________
7
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9726 toc15
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-110
10 100k
V
DD
= 5V + 100mV
P-P
R
IN
= R
F
= 10k
Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9726 toc16
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-110
10 100k
V
DD
= 3.3V + 100mV
P-P
R
IN
= R
F
= 10k
Ω
CROSSTALK vs. FREQUENCY
FREQUENCY (Hz)
CROSSTALK (dB)
MAX9726 toc17
-120
-110
-100
-90
-80
-70
-60
10 100 1k 10k 100k
V
IN
= 1V
P-P
R
L
= 32Ω
G = 0dB
RIGHT TO LEFT
LEFT TO RIGHT
Typical Operating Characteristics (continued)
(V
DD
= SHDN = 5V, PGND = SGND = 0V, C1 = C2 = 1µF, C
PREG
= C
NREG
= 1µF, BM_ = 0V, R
IN
= 10kΩ, R
F
= 10kΩ, maximum vol-
ume (overall gain = 0dB), BassMax disabled. Load connected between OUT_ and PGND where specified. Outputs in phase, both
channels loaded. T
A
= +25°C, unless otherwise noted.) (See the
Functional Diagram/Typical Operating Circuit
)
CROSSTALK vs. FREQUENCY
FREQUENCY (Hz)
CROSSTALK (dB)
MAX9726 toc18
-100
-90
-80
-70
-60
-50
-40
10 100 1k 10k 100k
V
IN
= 1V
P-P
R
L
= 32Ω
G = -10dB
LEFT TO RIGHT
RIGHT TO LEFT
BassMax FREQUENCY RESPONSE
MAX9726 toc19
FREQUENCY (Hz)
GAIN (dB)
10k1k10010
15
20
25
30
35
40
10
1 100k
R2 = 36k
Ω
C3 = 0.068
μ
F
R2 = 22k
Ω
C3 = 0.1
μ
F
R2 = 10k
Ω
C3 = 0.22
μ
F
R1 = 47k
Ω
R
L
= 32
Ω
BassMax DISABLED
OUTPUT FFT
MAX9726 toc20
FREQUENCY (kHz)
AMPLITUDE (dBV)
15105
-120
-100
-80
-60
-40
-20
0
-140
020
V
IN
= 100mV
RMS
ATTEN = 60dB
V
OUT
= -60dBV
R
L
= 320
Ω
f
IN
= 1kHz
V
DD
= 5V
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9726 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
454030 3520 2515
70
80
90
100
110
120
130
140
150
160
60
10 50
V
DD
= 5V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 2.2
μ
F
C1 = C2 = 1
μ
F
C1 = C2 = 0.68μF
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I
2
C, Volume and Gain Control
8
_______________________________________________________________________________________
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9726 toc22
LOAD RESISTANCE (
Ω
)
OUTPUT POWER (mW)
45403530252015
65
70
75
80
85
90
60
10 50
V
DD
= 3.3V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 2.2
μ
F
C1 = C2 = 1
μ
F
C1 = C2 = 0.68
μ
F
POWER-UP/POWER-DOWN
MAX9726 toc23
20ms/div
V
DD
2V/div
V
OUT_
10mV/div
R
L
= 32
Ω
EXITING SHUTDOWN
MAX9726 toc24
100
μ
s/div
V
SHDN
5V/div
V
IN_
200mV/div
V
OUT_
2V/div
ENTERING SHUTDOWN
MAX9726 toc25
20
μ
s/div
V
SHDN
5V/div
V
IN_
200mV/div
V
OUT_
2V/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9726 toc26
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
6
5
3
4
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
4.8
2
NO LOAD
INPUTS AC GROUNDED
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9726 toc27
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (μA)
543
5
6
7
8
9
10
4
26
NO LOAD
INPUTS AC GROUNDED
Typical Operating Characteristics (continued)
(V
DD
= SHDN = 5V, PGND = SGND = 0V, C1 = C2 = 1µF, C
PREG
= C
NREG
= 1µF, BM_ = 0V, R
IN
= 10kΩ, R
F
= 10kΩ, maximum vol-
ume (overall gain = 0dB), BassMax disabled. Load connected between OUT_ and PGND where specified. Outputs in phase, both
channels loaded. T
A
= +25°C, unless otherwise noted.) (See the
Functional Diagram/Typical Operating Circuit
)
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I
2
C, Volume and Gain Control
_______________________________________________________________________________________
9
Pin Description
PIN BUMP
TQFN UCSP
NAME FUNCTION
1A1 V
DD
Power-Supply Input. Bypass V
DD
to PGND with a 1µF capacitor.
2 A2 C1P
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P
and C1N.
3 A3 PGND Power Ground. Connect to SGND.
4 A4 C1N
Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P
and C1N.
5A5PV
SS
Charge-Pump Output. Connect to SV
SS
and bypass with a 1µF capacitor to PGND.
6 B3 SDA Serial Data Input. Connect a pullup resistor greater than 500Ω from SDA to V
DD
.
7 C3 SCL Serial Clock Input. Connect a pullup resistor greater than 500Ω from SCL to V
DD
.
8C2SHDN
Active-Low Shutdown Input. Drive SHDN low to disable the MAX9726. Connect SHDN to
V
DD
while bit 7 is high for normal operation (see the Command Register section).
9 B4 FBL
Left-Channel Feedback Output. Connect a feedback resistor between FBL and INL. See
the Gain-Setting Components section.
10 B5 INL
Left-Channel Input. Connect an input resistor to INL. See the Gain-Setting Components
section.
11 C5 INR
Right-Channel Input. Connect an input resistor to INR. See the Gain-Setting Components
section.
12 C4 FBR
Right-Channel Feedback Output. Connect a feedback resistor between FBR and INR. See
the Gain-Setting Components section.
13 D5 SGND Signal Ground. Connect to PGND.
14 D2 NREG Negative Supply Regulator Voltage. Bypass NREG to PGND with a 1µF capacitor.
15 D4 BMR
Right BassMax Input. Connect an external passive network between OUTR and BMR to
apply bass boost to the right-channel output. See the Gain-Setting Components section.
Connect BMR to SGND if BassMax is not used.
16 D1 SV
SS
Headphone Amplifier Negative Power-Supply Input. Connect to PV
SS
and bypass with a
1µF capacitor to PGND.
17 C1 OUTR Right Headphone Output
18 B1 OUTL Left Headphone Output
19 D3 BML
Left BassMax Input. Connect an external passive network between OUTL and BML to
apply bass boost to the right-channel output. See the Gain-Setting Components section.
Connect BML to SGND if BassMax is not used.
20 B2 PREG Positive Supply Regulator Voltage. Bypass PREG to PGND with a 1µF capacitor.
EP — EP Exposed Pad. Connect EP to SV
SS
or leave unconnected.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

1734709-9

Mfr. #:
Buy 1734709-9
Manufacturer:
TE Connectivity
Description:
Headers & Wire Housings 9 POS HDR R/A 1.0mm
Lifecycle:
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