參數(shù)資料
型號(hào)： MAX1249BCEE+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 0K
描述： IC ADC 10BIT SERIAL 16-QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 10
采樣率（每秒）： 133k
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）： 667mW
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： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 4 個(gè)單端，單極；4 個(gè)單端，雙極；2 個(gè)差分，單極；2 個(gè)差分，雙極
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
______________________________________________________________________________________
13
Data Framing
The falling edge of CS does not start a conversion. The
first logic high clocked into DIN is interpreted as a start
bit and defines the first bit of the control byte. A conver-
sion starts on the falling edge of SCLK, after the eighth
bit of the control byte (the PD0 bit) is clocked into DIN.
The start bit is defined as:
The first high bit clocked into DIN with CS low any
time the converter is idle; e.g., after VDD is applied.
OR
The first high bit clocked into DIN after bit 3 of a con-
version in progress is clocked onto the DOUT pin.
If CS is toggled before the current conversion is com-
plete, the next high bit clocked into DIN is recognized as
a start bit; the current conversion is terminated, and a
new one is started.
The fastest the MAX1248/MAX1249 can run with CS
held low between conversions is 15 clocks per conver-
sion. Figure 10a shows the serial-interface timing nec-
essary to perform a conversion every 15 SCLK cycles
in external clock mode. If CS is tied low and SCLK is
continuous, guarantee a start bit by first clocking in 16
zeros.
Most microcontrollers require that conversions occur in
multiples of 8 SCLK clocks; 16 clocks per conversion is
typically the fastest that a microcontroller can drive the
MAX1248/MAX1249. Figure 10b shows the serial-inter-
face timing necessary to perform a conversion every 16
SCLK cycles in external clock mode.
__________ Applications Information
Power-On Reset
When power is first applied, and if SHDN is not pulled
low, internal power-on reset circuitry activates the
MAX1248/MAX1249 in internal clock mode, ready to
convert with SSTRB = high. After the power supplies
have stabilized, the internal reset time is 10s, and no
conversions should be performed during this phase.
SSTRB is high on power-up and, if CS is low, the first
logical 1 on DIN is interpreted as a start bit. Until a con-
version takes place, DOUT shifts out zeros (also see
Table 4).
Reference-Buffer Compensation
In addition to its shutdown function, SHDN selects inter-
nal or external compensation. The compensation
affects both power-up time and maximum conversion
speed. The 100kHz minimum clock rate is limited by
droop on the sample-and-hold, and is independent of
the compensation used.
PD0 CLOCK IN
tSSTRB
tCSH
tCONV
tSCK
SSTRB
SCLK
DOUT
tCSS
tDO
NOTE: FOR BEST NOISE PERFORMANCE, KEEP SCLK LOW DURING CONVERSION.
CS
Figure 9. Internal Clock Mode SSTRB Detailed Timing
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MAX1249BCPE 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
MAX1249BCPE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 4Ch 133ksps 5.25V 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
MAX1249BEEE 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
MAX1249BEEE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 4Ch 133ksps 5.25V 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
MAX1249BEEE+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 4Ch 133ksps 5.25V 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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