參數(shù)資料
型號(hào)： AD1974YSTZ-RL
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 0K
描述： IC CODEC 4CH ADC W/PLL 48-LQFP
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 24
采樣率（每秒）： 192k
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 429mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類(lèi)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： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 4 個(gè)差分，單極
AD1974
Data Sheet
Rev. D | Page 14 of 24
LEFT
RIGHT
MSB
ADCL1
ADCR1
ADCL2
ADCR2
AUXL1
AUXR1
AUXL2
AUXR2
UNUSED UNUSED UNUSED UNUSED
FOUR-ON-CHIP
ADC CHANNELS
AUXILIARY ADC CHANNELS
UNUSED SLOTS
32 BITS
06
61
4-
0
52
AUXLRCLK
(AUX PORT)
AUXBCLK
(AUX PORT)
AUXDATA1
(AUX1_IN)
AUXDATA2
(AUX2_IN)
ALRCLK
ABCLK
ASDATA1
(TDM_OUT)
Figure 8. 16-Channel AUX ADC Mode
DAISY-CHAIN MODE
The AD1974 also allows a daisy-chain configuration to
expand the system to 8 ADCs and 16 ADCs (see Figure 9 and
Figure 10). There are two configurations for the ADC port to
work in daisy-chain mode. The first one is with an ABCLK at
256 fS shown in Figure 9. The second configuration is with an
ABCLK at 512 fS shown in Figure 10. Note that in the 512 fS
ABCLK mode, the ADC channels occupy the first eight slots,
the second eight slots are empty. The TDM_IN of the first
AD1974 must be grounded in all modes of operation. The
second AD1974 is the device attached to the DSP TDM port.
The I/O pins of the serial ports are defined according to the
serial mode selected. See Table 13 for a detailed description
of the function of each pin. See Figure 14 for a typical AD1974
configuration with two external stereo ADCs.
Figure 11 through Figure 13 show the serial mode formats.
For maximum flexibility, the polarity of LRCLK and BCLK
are programmable. All of the clocks are shown with their
normal polarity. The default mode is I2S.
ALRCLK
ABCLK
ASDATA2 (TDM_IN
OF THE SECOND AD1974
IN THE CHAIN)
ADCL1
ADCR1
ADCL2
ADCR2
FOUR ADC CHANNELS OF THE FIRST IC IN THE CHAIN
FOUR ADC CHANNELS OF THE SECOND IC IN THE CHAIN
ASDATA1 (TDM_OUT
OF THE SECOND AD1974
IN THE CHAIN)
ADCL1
ADCR1
ADCL2
ADCR2
ADCL1
ADCR1
ADCL2
ADCR2
32 BITS
MSB
DSP
SECOND
AD1974
FIRST
AD1974
06
61
4-
05
6
Figure 9. ADC TDM Daisy-Chain Mode (256 fS ABCLK, Two AD1974 Daisy Chains)
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