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參數(shù)資料
| 型號(hào)： | MAX9723DEVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 3/25頁(yè) |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9723 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | DirectDrive® |
| 放大器類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)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(guān)產(chǎn)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 |
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Click-and-Pop Suppression
The output-coupling capacitor is a major contributor of
audible clicks and pops in conventional single-supply
headphone amplifiers. The amplifier charges the cou-
pling capacitor to its output bias voltage at startup.
During shutdown the capacitor is discharged. This
charging and discharging results in a DC shift across
the capacitor, which appears as an audible transient at
the speaker. Since the MAX9723 headphone amplifier
does not require output-coupling capacitors, no audi-
ble transients occur.
Additionally, the MAX9723 features extensive click-and-
pop suppression that eliminates any audible transient
sources internal to the device. The Power-Up/Power-
Down Waveform in the Typical Operating Characteristics
shows that there are minimal transients at the output upon
startup or shutdown.
In most applications, the preamplifier driving the
MAX9723 has a DC bias of typically half the supply.
The input-coupling capacitor is charged to the pream-
plifier’s bias voltage through the MAX9723’s input
impedance (RIN) during startup. The resulting voltage
shift across the capacitor creates an audible click/pop.
To avoid clicks/pops caused by the input filter, delay
the rise of SHDN by at least 4 time constants, 4 x RIN x
CIN, relative to the start of the preamplifier.
BassMax (Bass Boost)
Typical headphones do not have a flat-frequency
response. The small physical size of the diaphragm
does not allow the headphone speaker to efficiently
reproduce low frequencies. This physical limitation
results in attenuated bass response. The MAX9723
includes a bass boost feature that compensates for the
headphone’s poor bass response by increasing the
amplifier gain at low frequencies.
The DirectDrive output of the MAX9723 has more head-
room than typical single-supply headphone amplifiers.
This additional headroom allows boosting the bass fre-
quencies without the output-signal clipping.
Program the BassMax gain and cutoff frequency with
external components connected between OUT_ and
BB_ (see the Functional Diagram/Typical Operating
Circuit). Use the I2C-compatible interface to program the
command register to enable/disable the BassMax circuit.
BB_ is connected to the noninverting input of the output
amplifier when BassMax is enabled. BB_ is pulled to
SGND when BassMax is disabled. The typical application
of the BassMax circuit involves feeding a lowpass version
of the output signal back to the amplifier. This is realized
using positive feedback from OUT_ to BB_. Figure 2
shows the connections needed to implement BassMax.
Maximum Gain Control
The MAX9723A and MAX9723B have selectable
maximum gains of -5dB or 0dB (see Table 5) while
the MAX9723C and MAX9723D have selectable maxi-
mum gains of +1dB or +6dB (see Table 6). Bit 5 in the
command register selects between the two maximum
gain settings.
Volume Control
The MAX9723 includes a 32-level volume control that
adjusts the gain of the output amplifiers according to
the code contained in the command register. Volume is
programmed through the command register bits [4:0].
Tables 7–10 show all of the available gain settings for
the MAX9723A–MAX9723D. The mute attenuation is
typically better than 100dB when driving a 32
Ω load.
Serial Interface
The MAX9723 features an I2C/SMBus-compatible,
2-wire serial interface consisting of a serial data line
(SDA) and a serial clock line (SCL). SDA and SCL facili-
tate communication between the MAX9723 and the
master at clock rates up to 400kHz. Figure 3 shows the
2-wire interface timing diagram. The MAX9723 is a
receive-only slave device relying on the master to gen-
erate the SCL signal. The MAX9723 cannot write to the
SDA bus except to acknowledge the receipt of data
MAX9723
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
______________________________________________________________________________________
11
C3
R2
R1
R
OUT_
BB_
AUDIO
INPUT
MAX9723
BassMax
ENABLE
Figure 2. BassMax External Connections
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| MAX9723DEVKIT+ | 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX9723A/B/C/D Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
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| MAX9724AEBC+G45 | 制造商:Maxim Integrated Products 功能描述:60MW DIRECTDRIVE STEREO HEADPHONE - Tape and Reel |
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