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參數(shù)資料
| 型號： | MAX1149BCUP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 116KSPS 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 74 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 116k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 879mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 8 個單端，單極；8 個單端，雙極；4 個差分，單極；4 個差分，雙極 |
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
22
______________________________________________________________________________________
TMS32OLC3x Interface
Figure 19 shows an application circuit to interface the
MAX1146–MAX1149 to the TMS320 in external clock
mode. The timing diagram for this interface circuit is
shown in Figure 20. Use the following steps to initiate a
conversion in the MAX1146–MAX1149 and to read the
results:
1) The TMS320 should be configured with CLKX
(transmit clock) as an active-high output clock and
CLKR (TMS320 receive clock) as an active-high
input clock. CLKX and CLKR on the TMS320 are
connected together with the MAX1146–MAX1149
SCLK input.
2) Drive the CS of the MAX1146–MAX1149 low
through the XF_ I/O port of the TMS320 to clock
data into the MAX1146–MAX1149 DIN.
3) Write
an
8-bit
word
(1XXXXX11)
to
the
MAX1146–MAX1149 to initiate a conversion and
place the device into external clock mode. Refer to
Table 1 to select the proper XXXXX bit values for
your specific application.
4) The MAX1146–MAX1149 SSTRB output is moni-
tored by the FSR input of the TMS320. A falling
edge on the SSTRB output indicates that the con-
version is in progress and data is ready to be
received from the MAX1146–MAX1149.
5) The TMS320 reads in one data bit on each of the
next 16 rising edges of SCLK. These data bits rep-
resent the 14-bit conversion result followed by 2
trailing bits, which should be ignored.
6) Pull CS high to disable the MAX1146–MAX1149
until the next conversion is initiated.
Layout, Grounding, and Bypassing
Careful PC board layout is essential for best system
performance. Boards should have separate analog and
digital ground planes. Ensure that digital and analog
signals are separated from each other. Do not run ana-
log and digital (especially clock) lines parallel to one
another, or digital lines underneath the device pack-
age.
Figure 4 shows the recommended system ground con-
nections. Establish an analog ground point at AGND
and a digital ground point at DGND. Connect all analog
grounds to the star analog ground. Connect the digital
grounds to the star digital ground. Connect the digital
ground point to the analog ground point directly at the
device. For lowest noise operation, the ground return to
the star ground’s power supply should be low imped-
ance and as short as possible.
MAX1146–
MAX1149
XF
CLKX
CLKR
DX
DR
FSR
SCLK
DIN
DOUT
SSTRB
TMS320LC3x
CS
Figure 19. MAX1146–MAX1149-to-TMS320 Serial Interface
SCLK
DIN
SSTRB
DOUT
START
SEL2
SEL1
SEL0
PD1
PD0
MSB
B12
B1
LSB
HIGH-Z
CS
SGL/DIF
UNI/BIP
Figure 20. TMS320 Serial-Interface Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1149BCUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 3.3V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1149BCUP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 3.3V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1149BCUP-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1149BEUP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1149BEUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 3.3V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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