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參數資料
| 型號： | MAX9723DEVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 6/25頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9723 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 系列： | DirectDrive® |
| 放大器類型： | AB 類 |
| 輸出類型： | 耳機，2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數量： | 60mW x 2 @ 16 歐姆 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX9723D |
| 已供物品： | 板 |
| 相關產品： | MAX9723DETE+T-ND - IC AMP AUDIO .06W STER AB 16TQFN MAX9723DEBE+T-ND - IC AMP AUDIO .06W STER AB 16UCSP MAX9723DETE+-ND - IC AMP AUDIO .06W STER AB 16TQFN |
MAX9723
The MAX9723A and MAX9723B have a maximum gain
setting of -5dB or 0dB, while the MAX9723C and
MAX9723D have a maximum gain setting of +1dB or
+6dB. B5 in the command register programs the maxi-
mum gain (see Tables 5 and 6).
Adjust the MAX9723’s amplifier gain with the volume
control bits [4:0]. The gain is adjustable to one of 32
steps ranging from full mute to the maximum gain pro-
grammed by B5. Tables 7–10 list all the possible gain
settings for the MAX9723. Figures 7–10 show the vol-
ume control transfer functions for the MAX9723.
Power-On Reset
The contents of the MAX9723’s command register at
power-on are shown in Table 11.
Applications Information
Power Dissipation and Heat Sinking
Linear power amplifiers can dissipate a significant
amount of power under normal operating conditions.
The maximum power dissipation for each package is
given in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
where TJ(MAX) is +150°C, TA is the ambient tempera-
ture, and
θJA is the reciprocal of the derating factor in
°C/W as specified in the Absolute Maximum Ratings
section. For example,
θJA for the thin QFN package is
+59°C/W.
The MAX9723 has two power dissipation sources, the
charge pump and the two output amplifiers. If the
power dissipation exceeds the rated package dissipa-
tion, reduce VDD, increase load impedance, decrease
the ambient temperature, or add heatsinking. Large
output, supply, and ground traces decrease
θJA, allow-
ing more heat to be transferred from the package to
surrounding air.
Output Dynamic Range
Dynamic range is the difference between the noise
floor of the system and the output level at 1% THD+N. It
is essential that a system’s dynamic range be known
before setting the maximum output gain. Output clip-
ping will occur if the output signal is greater than the
dynamic range of the system. The DirectDrive architec-
ture of the MAX9723 has increased dynamic range
compared to other single-supply amplifiers.
Use the THD+N vs. Output Power in the Typical
Operating Characteristics to identify the system’s
dynamic range. Find the output power that causes 1%
THD+N for a given load. This point will indicate what
output power causes the output to begin to clip. Use
the following equation to determine the peak output
voltage that causes 1% THD+N for a given load.
where POUT_1% is the output power that causes 1%
THD+N, RL is the load resistance, and VOUT_(P-P) is the
peak output voltage. After VOUT_(P-P) is identified,
determine the peak input voltage that can be amplified
without clipping:
where VIN_(P-P) is the largest peak voltage that can be
amplified without clipping, and AV is the voltage gain of
V
IN P P
OUT P P
AV
_(
)
_(
)
=
10 20
VP
R
OUT P P
OUT
L
_(
)
_ %
()
=×
22
1
P
TT
D MAX
J MAX
A
JA
()
=
θ
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
14
______________________________________________________________________________________
S
ACK
0
ACKNOWLEDGE FROM MAX9723
R/W
ACKNOWLEDGE
FROM MAX9723
B7 B6 B5 B4 B3 B2
COMMAND BYTE IS STORED ON
RECEIPT OF STOP CONDITION
ACK
P
B1 B0
SLAVE ADDRESS
COMMAND BYTE
Figure 6. Write Data Format Example
MAXIMUM GAIN (dB)
B5
-5
0
01
Table 5. MAX9723A and MAX9723B
Maximum Gain Control
MAXIMUM GAIN (dB)
B5
+1
0
+6
1
Table 6. MAX9723C and MAX9723D
Maximum Gain Control
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9723DEVKIT+ | 功能描述:放大器 IC 開發工具 MAX9723A/B/C/D Eval Kit RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9724AEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.045W CLS-AB 12UCSP - Rail/Tube |
| MAX9724AEBC+G45 | 制造商:Maxim Integrated Products 功能描述:60MW DIRECTDRIVE STEREO HEADPHONE - Tape and Reel |
| MAX9724AEBC+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.045W CLS-AB 12UCSP - Tape and Reel |
| MAX9724AEBC+TG45 | 功能描述:音頻放大器 60mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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