參數(shù)資料
型號(hào)： AD1938WBSTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 0K
描述： IC CODEC 24BIT 4ADC/8DAC 48LQFP
標(biāo)準(zhǔn)包裝： 1
類型： 通用
數(shù)據(jù)接口： 串行
分辨率（位）： 24 b
ADC / DAC 數(shù)量： 4 / 8
三角積分調(diào)變： 是
S/N 比，標(biāo)準(zhǔn) ADC / DAC (db)： 94 / 94
動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： 105 / 106
電壓 - 電源，模擬： 3 V ~ 3.6 V
電壓 - 電源，數(shù)字： 3 V ~ 3.6 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 托盤
AD1938
Data Sheet
Rev. E | Page 14 of 32
the reference clock is attenuated above a certain frequency
depending on the loop filter.
RESET AND POWER-DOWN
The function of the RST pin sets all the control registers to their
default settings. To avoid pops, reset does not power down the
analog outputs. After RST is deasserted, and the PLL acquires
lock condition, an initialization routine runs inside the AD1938.
This initialization lasts for approximately 256 master clock cycles.
The power-down bits in the PLL and Clock Control 0, DAC
Control 1, and ADC Control 1 registers power down the
respective sections. All other register settings are retained. To
guarantee proper start up, the RST pin should be pulled low by
an external resistor.
SERIAL CONTROL PORT
The AD1938 has an SPI control port that permits programming
and reading back of the internal control registers for the ADCs,
DACs, and clock system. There is also a standalone mode
available for operation without serial control that is configured
at reset using the serial control pins. All registers are set to
default, except the internal master clock enable which is set to 1,
and ADC BCLK and LRCLK master/slave is set by the COUT
pin. Refer to Table 11 for details. Standalone mode only
supports stereo mode with an I2S data format and 256 fS master
clock rate. It is recommended to use a weak pull-up resistor on
CLATCH in applications that have a microcontroller. This pull-
up resistor ensures that the AD1938 recognizes the presence of
a microcontroller.
The SPI control port of the AD1938 is a 4-wire serial control
port. The format is similar to the Motorola SPI format except
the input data-word is 24 bits wide. The serial bit clock and
latch can be completely asynchronous to the sample rate of the
ADCs and DACs. Figure 11 shows the format of the SPI signal.
The first byte is a global address with a read/write bit. For the
AD1938, the address is 0x04, shifted left one bit due to the R/W
bit. The second byte is the AD1938 register address and the
third byte is the data.
Table 11. Standalone Mode Selection
ADC Clocks
CIN
COUT
CCLK
CLATCH
Slave
0
Master
0
1
0
D0
D8
D22
D23
D9
CLATCH
CCLK
CIN
COUT
tCCH tCCL
tCDS tCDH
tCLS
tCCP
tCLH
tCOTS
tCOD
tCOE
055
82
-011
Figure 11. Format of SPI Signal
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AD1938WBSTZ-RL 功能描述:IC CODEC 24BIT 4ADC/8DAC 48LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標(biāo)準(zhǔn) ADC / DAC (db):81.5 / 88 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR)
AD1938XSTZ 制造商:Analog Devices 功能描述:AUD CODEC 4ADC / 8DAC 24BIT 48LQFP - Trays
AD1938XSTZRL 制造商:Analog Devices 功能描述:AUD CODEC 4ADC / 8DAC 24BIT 48LQFP - Tape and Reel
AD1938YSTZ 功能描述:IC CODEC 24BIT 4ADC/8DAC 48LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標(biāo)準(zhǔn) ADC / DAC (db):81.5 / 88 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR)
AD1938YSTZRL 功能描述:IC CODEC 24BIT 4ADC/8DAC 48LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標(biāo)準(zhǔn) ADC / DAC (db):81.5 / 88 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR)
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