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參數(shù)資料
| 型號： | MAX9850ETI+TG47 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO HDPHN STER 28WQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 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(shù)量： | 95mW x 2 @ 16 歐姆 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 特點： | DAC，消除爆音，數(shù)字輸入，I²C，I²S，線路級輸入和輸出，靜音，關(guān)機，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 封裝/外殼： | 28-WFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
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MAX9850
where:
fICLK = ICLK frequency. fICLK must be at least 176 x
fLRCLK for proper DAC operation.
fLRCLK = LRCLK frequency.
NMSB,LSB = decimal value of MSB(14:8) and LSB(7:0)
(register 0x8, bits B6–B0 and register 0x9, bits B7–B0).
Round the results of the equation to the nearest integer
value.
For example:
fLRCLK = 44.1kHz, fICLK = 12.288MHz.
1) Solve for NMSB,LSB, 15052.8.
2) Round result to nearest integer value. 15053.
3) Convert to hex, 0x3CD.
4) Program MSB(14:8) with the MSB 0x3A and program
LSB(7:0) with the LSB 0xCD).
Table 7 provides examples of using master noninteger
mode with various MCLK frequencies to generate useful
LRCLK frequencies.
Charge Pump
The DirectDrive line and headphone outputs of the
MAX9850 require a charge pump to create the internal
negative power supply. Set CPEN(1:0) = 11 in the
enable register (register 0x5, bits B5 and B4) to turn on
the charge pump. The negative charge-pump voltage
is established and the audio outputs are ready for use
approximately 1.4ms after CPEN is set to 11.
The state of CP(4:0), in the charge-pump register (register
0x7, bits B4–B0), determines whether the charge-pump
oscillator is derived from the internal 667kHz oscillator or
from MCLK. Set CPEN(1:0) = 11 and set CP(4:0) = 0x00
to enable the internal oscillator. The charge pump runs
independent from MCLK when the internal oscillator is
enabled allowing the charge pump to operate when the
DAC is disabled or when only the line inputs are used. No
MCLK is required when only the line inputs are used.
The switching frequency of the charge pump is well
beyond the audio range and does not interfere with audio
signals. The switch drivers utilize techniques that mini-
mize noise generated by turn-on and turn-off transients.
Although not typically required, additional high-frequency
noise attenuation can be achieved by increasing the size
of C2 and the PVDD bypass capacitor (see the Functional
Diagram/Typical Operating Circuit).
Derive the charge-pump clock from MCLK by program-
ming CP(4:0) to a non-zero value based on the following
equation:
where:
fMCLK = MCLK frequency.
fCP = charge-pump clock frequency. Ensure fCP =
667kHz
±20% for proper operation.
SF = MCLK scale factor. SF is the decimal value of
IC(1:0) + 1.
NCP(4:0) = rounded decimal value of CP(4:0) (register
0x7, bits B4–B0). NCP(4:0) must be greater than 1 when
deriving the charge-pump clock from ICLK.
N
f
fSF
CP
MCLK
CP
(: )
40
2
=
××
Stereo Audio DAC with DirectDrive
Headphone Amplifier
20
______________________________________________________________________________________
Table 7. Master Noninteger NMSB,LSB Examples
N (15-BIT hex VALUE)
LRCLK OUTPUT FREQUENCY (kHz)
MCLK
(MHz)
SF
ICLK
(MHz)
48
44.1
32
24
22.05
16
12
11.03
8
18.4320
2
9.2160
5555
4E66
38E4
2AAB
2733
1C72
1555
139A
0E39
16.9344
2
8.4672
5CE1
5555
3DEB
2E71
2AAB
1EF6
1738
1555
0F7B
16.3840
2
8.1920
5833
4000
3000
2C1A
2000
1800
160D
1000
12.5000
1
12.5000
3EEA
39CE
29F1
1F75
1CE7
14F9
0FBB
0E73
0A7C
12.2880
1
12.2880
4000
3ACD
2AAB
2000
1D66
1555
1000
0EB3
0AAB
12.0000
1
12.0000
4189
3C36
2BB1
20C5
1E1B
15D8
1062
0F0E
0AEC
11.2896
1
11.2896
45A9
4000
2E71
22D4
2000
1738
116A
1000
0B9C
9.2160
1
9.2160
5555
4E66
38E4
2AAB
2733
1C72
1555
139A
0E39
8.4672
1
8.4672
5CE1
5555
3DEB
2E71
2AAB
1EF6
1738
1555
0F7B
8.4480
1
8.4480
5D17
5587
3E10
2E8C
2AC3
1F08
1746
1562
0F84
Note: The N values represent the combined MSB(14:8) and LSB(7:0) values.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9850EVCMOD2 | 制造商:Maxim Integrated Products 功能描述:STEREO AUDIO DAC WITH DIRECTDRIVE HEADPHONE A - Rail/Tube |
| MAX9850EVCMOD2# | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC MAX9850 Evaluation System/Evaluation Kit RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| MAX9850EVKIT | 制造商:Maxim Integrated Products 功能描述:STEREO AUDIO DAC WITH DIRECTDRIVE HEADPHONE A - Bulk |
| MAX9850EVKIT# | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC MAX9850 Evaluation System/Evaluation Kit RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| MAX9851ETM+ | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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