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MAX9703/MAX9704は、80dBの高PSRR、0.07%の低THD+N、および95dB以上のSN比を備えています。短絡および熱過負荷保護によって、障害状態時にデバイスを損傷から保護します。MAX9703は、32ピンTQFNパッケージ(5mm x 5mm x 0.8mm)で提供されます。MAX9704は、32ピンTQFNパッケージ(7mm x7mm x 0.8mm)で提供されます。両デバイスは、-40℃~+85℃の拡張温度範囲での動作が保証されています。
10Wステレオ/15Wモノラルフィルタレス、スペクトラム拡散、D級アンプABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to PGND.)VDD to PGND, AGND .............................................................30VOUTR_, OUTL_, C1N..................................-0.3V to (VDD + 0.3V)C1P............................................(VDD - 0.3V) to (CHOLD + 0.3V)CHOLD........................................................(VDD - 0.3V) to +40VAll Other Pins to PGND...........................................-0.3V to +12VDuration of OUTR_/OUTL_
Short Circuit to PGND, VDD ................................................10sContinuous Input Current (VDD, PGND) ...............................1.6AContinuous Input Current......................................................0.8AContinuous Input Current (all other pins)..........................±20mA
Continuous Power Dissipation (TA = +70°C)Single-Layer Board:
Junction Temperature ......................................................+150°COperating Temperature Range ...........................-40°C to +85°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS(VDD = 15V, AGND = PGND = 0V, SHDN ≥ VIH, AV = 16dB, CSS = CIN = 0.47μF, CREG = 0.01μF, C1 = 100nF, C2 = 1μF, FS1 = FS2 =PGND (fS = 660kHz), RL connected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA = TMIN to TMAX, unless otherwise noted.Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage Range VDD Inferred from PSRR test 10 25 V
MAX9703 14 22Quiescent Current IDD RL = OPEN
MAX9704 24 34mA
Shutdown Current ISHDN 0.2 1.5 μA
CSS = 470nF 100Turn-On Time tON
CSS = 180nF 50ms
Amplifier Output Resistance inShutdown
SHDN = PGND 150 330 kΩ
AV = 13dB 35 58 80
AV = 16dB 30 48 65
AV = 19.1dB 23 39 55Input Impedance RIN
AV = 29.6dB 10 15 22
kΩ
G1 = L, G2 = L 29.4 29.6 29.8
G1 = L, G2 = H 18.9 19.1 19.3
G1 = H, G2 = L 12.8 13 13.2Voltage Gain AV
G1 = H, G2 = H 15.9 16 16.3
dB
Gain Matching Between channels (MAX9704) 0.5 %
Output Offset Voltage VOS ±6 ±30 mV
Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 60 dB
フィルタレス、スペクトラム拡散、D級アンプELECTRICAL CHARACTERISTICS (continued)(VDD = 15V, AGND = PGND = 0V, SHDN ≥ VIH, AV = 16dB, CSS = CIN = 0.47μF, CREG = 0.01μF, C1 = 100nF, C2 = 1μF, FS1 = FS2 =PGND (fS = 660kHz), RL connected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA = TMIN to TMAX, unless otherwise noted.Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RL = 4Ω 10
RL = 8Ω 15Continuous Output Power(MAX9703)
PCONT
TH D + N = 10%, VDD =16V, f = 1kH z, TA = + 25°C , tCONT = 15min(Note 4) RL = 16Ω, VDD = 24V 18
W
RL = 4Ω 2x5
RL = 8Ω 2x10Continuous Output Power(MAX9704)
PCONT
TH D + N = 10%, VDD =16V, f = 1kH z, TA = + 25°C , tCONT = 15min(Note 4) RL = 16Ω, VDD = 24V 2x16
W
Total Harmonic Distortion PlusNoise
THD+NfIN = 1kHz, either FFM or SSM, RL = 8Ω,POUT = 4W
0.07 %
FFM 94BW = 22Hz to22kHz SSM 88
FFM 97Signal-to-Noise Ratio SNR
RL = 8Ω, POUT =10W, f = 1kHz
A-weightedSSM 91
dB
Crosstalk Left to right, right to left, 8Ω load, fIN = 10kHz 65 dB
FS1 = L, FS2 = L 560 670 800
FS1 = L, FS2 = H 940
FS1 = H, FS2 = L 470Oscillator Frequency fOSC
FS1 = H, FS2 = H (spread-spectrum mode)670±7%
kHz
POUT = 15W, f = 1kHz, RL = 8Ω 78Efficiency η
POUT = 10W, f = 1kHz, RL = 16Ω 88%
Regulator Output VREG 6 V
DIGITAL INPUTS (SHDN, FS_, G_)
VIH 2.5Input Thresholds
VIL 0.8V
Input Leakage Current ±1 μA
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL = 8Ω, L = 68μH.
For RL = 4Ω, L = 33μH.Note 3: PSRR is specified with the amplifier inputs connected to AGND through CIN.Note 4: The MAX9704 continuous 8Ω and 16Ω power measurements account for thermal limitations of the 32-pin TQFN-EP package.
Continuous 4Ω power measurements account for short-circuit protection of the MAX9703/MAX9704 devices.
Maxim Integrated 3
MA
X9
70
3/M
AX
97
04
10Wステレオ/15Wモノラルフィルタレス、スペクトラム拡散、D級アンプ
TOTAL HARMONIC DISTORTION PLUSNOISE vs. FREQUENCY
MAX
9703
/04
toc0
1
FREQUENCY (Hz)
THD+
N (%
)
10k1k100
0.1
1
10
0.0110 100k
VDD = 15VRL = 4ΩAV = 16dB
POUT = 4W
POUT = 500mW
TOTAL HARMONIC DISTORTION PLUSNOISE vs. FREQUENCY
MAX
9703
/04
toc0
2
FREQUENCY (Hz)
THD+
N (%
)
10k1k100
0.1
1
10
0.0110 100k
VDD = 15VRL = 8Ω�AV = 16dB
POUT = 500mW
POUT = 8W
TOTAL HARMONIC DISTORTION PLUSNOISE vs. FREQUENCY
MAX
9703
/04
toc0
3
FREQUENCY (Hz)
THD+
N (%
)
10k1k100
0.1
1
10
0.0110 100k
VDD = 20VRL = 8ΩAV = 16dB
POUT = 8W
POUT = 500mW
TOTAL HARMONIC DISTORTION PLUSNOISE vs. FREQUENCY
MAX
9703
/04
toc0
4
FREQUENCY (Hz)
THD+
N (%
)
10k1k100
0.1
1
10
0.0110 100k
VDD = 20VRL = 8Ω�AV = 16dBPOUT = 8W
SSM
FFM
TOTAL HARMONIC DISTORTION PLUSNOISE vs. OUTPUT POWER
MAX
9703
/04
toc0
7
OUTPUT POWER (W)
THD+
N (%
)
42 6 8 10 12 14 16 18
0.1
1
10
100
0.010 20
VDD = 20VRL = 8Ω�AV = 16dB
f = 100Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUSNOISE vs. OUTPUT POWER
MAX
9703
/04
toc0
5
OUTPUT POWER (W)
THD+
N (%
)
64 52 31
0.1
1
10
100
0.010 1097 8
VDD = 15VRL = 4Ω�AV = 16dB
f = 10kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION PLUSNOISE vs. OUTPUT POWER
MAX
9703
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toc0
6
OUTPUT POWER (W)
THD+
N (%
)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.1
1
10
0.010 15
VDD = 15VRL = 8Ω�AV = 16dB
f = 100Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUSNOISE vs. OUTPUT POWER
MAX
9703
/04
toc0
8
OUTPUT POWER (W)
THD+
N (%
)
1 2 3 4 5 6 7 8 9 10111213141516171819
0.1
1
10
0.010 20
FFM (335kHz)
SSM
VDD = 20VRL = 8Ω�AV = 16dBf = 1kHz
EFFICIENCY vs. OUTPUT POWER
MAX
9703
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toc0
9
OUTPUT POWER (W)
EFFI
CIEN
CY (%
)
8642 3 5 7 91
10
20
30
40
50
60
70
80
90
100
00 10
VDD = 12VAV = 16dBf = 1kHz
RL = 4Ω
RL = 8Ω
標準動作特性 ______________________________________________________________________(33μH with 4Ω, 68μH with 8Ω, part in SSM mode, 136μH with 16Ω, measurement BW = 22Hz to 22kHz, unless otherwise noted.)
標準動作特性(続き) ________________________________________________________________(33μH with 4Ω, 68μH with 8Ω, part in SSM mode, 136μH with 16Ω, measurement BW = 22Hz to 22kHz, unless otherwise noted.)
Maxim Integrated 5
MA
X9
70
3/M
AX
97
04
10Wステレオ/15Wモノラルフィルタレス、スペクトラム拡散、D級アンプ
FREQUENCY (kHz)
OUTP
UT M
AGNI
TUDE
(dB)
-120
-100
-80
-60
-40
-20
0
20
-140181612 144 6 8 1020 20 100k 1M 10M 100M
WIDEBAND OUTPUT SPECTRUM(FFM MODE)
MAX
9703
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toc2
0
FREQUENCY (Hz)
OUTP
UT A
MPL
ITUD
E (d
BV)
0
-120
-100
-80
-60
-40
-20
RBW = 10kHzVDD = 15V
100k 1M 10M 100M
WIDEBAND OUTPUT SPECTRUM(SSM MODE)
MAX
9703
/04
toc2
1
FREQUENCY (Hz)
OUTP
UT A
MPL
ITUD
E (d
BV)
0
-120
-100
-80
-60
-40
-20
RBW = 10kHzVDD = 15V
TURN-ON/TURN-OFF RESPONSEMAX9703/04 toc22
20ms/div
OUTPUT1V/div
5V/divSHDN
f = 1kHzRL = 8Ω
CSS = 180pF
SUPPLY CURRENTvs. SUPPLY VOLTAGE
MAX
9703
/04
toc2
3
SUPPLY VOLTAGE (V)
SUPP
LY C
URRE
NT (m
A)
22191613
10
5
15
20
25
30
35
010 25
SHUTDOWN CURRENTvs. SUPPLY VOLTAGE
MAX
9770
3/04
toc2
4
SUPPLY VOLTAGE (V)
SHUT
DOW
N CU
RREN
T (μ
A)
18161412
0.10
0.05
0.15
0.20
0.25
0.30
0.35
010 20
標準動作特性(続き) ________________________________________________________________(33μH with 4Ω, 68μH with 8Ω, part in SSM mode, 136μH with 16Ω, measurement BW = 22Hz to 22kHz, unless otherwise noted.)
従来のD級アンプでは、アンプのPWM出力からオーディオ信号を復元する出力フィルタが必要です。このフィルタのためにコストがかかり、アンプのソリューションサイズが増大し、効率が低下する場合もあります。従来のPWM方式では大差動出力スイング(2 x VDDピークトゥピーク)を使うため、大リップル電流が発生します。その結果、フィルタ部品の寄生抵抗によって電力損失が発生し、効率が低下します。
AB級アンプとは異なり、D級アンプの出力オフセット電圧によって、負荷時の自己消費電流の消費量が大幅に増加することはありません。これは、D級アンプの電力変換のおかげです。たとえば、8Ω負荷への8mV DCオフセットによって、AB級デバイスでは1mAの追加電流消費が発生します。D級の場合は、8Ωへの8mVのオフセットは、8μWの追加電力流出になります。D級アンプの高効率のおかげで、これは8μW/(VDD/100 x η)すなわち数μAオーダーの追加自己電流消費になります。