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參數(shù)資料
| 型號： | MAX197AEAI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS 12BIT SNGL 28-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 電壓電源： | 單電源 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 帶卷 (TR) |
MAX197
Power-Down Mode
To save power, you can put the converter into low-
current shutdown mode between conversions. Two
programmable power-down modes are available, in
addition to a hardware shutdown. Select STBYPD or
FULLPD by programming PD0 and PD1 in the input
control byte. When software power-down is asserted, it
becomes effective only after the end of conversion. In all
power-down modes, the interface remains active and
conversion results may be read. Input overvoltage pro-
tection is active in all power-down modes. The device
returns to normal operation on the first WR falling edge
during write operation.
For hardware-controlled (FULLPD) power-down, pull
the SHDN pin low. When hardware shutdown is assert-
ed, it becomes effective immediately and the conver-
sion is aborted.
Choosing Power-Down Modes
The bandgap reference and reference buffer remain
active in STBYPD mode, maintaining the voltage on the
4.7F capacitor at the REF pin. This is a “DC” state that
does not degrade after power-down of any duration.
Therefore, you can use any sampling rate with this
mode, without regard to start-up delays.
However, in FULLPD mode, only the bandgap refer-
ence is active. Connect a 33F capacitor between REF
and AGND to maintain the reference voltage between
conversion and to reduce transients when the buffer is
enabled and disabled. Throughput rates down to 1ksps
can be achieved without allotting extra acquisition time
for reference recovery prior to conversion. This allows
conversion to begin immediately after power-down
ends. If the discharge of the REF capacitor during
FULLPD exceeds the desired limits for accuracy (less
than a fraction of an LSB), run a STBYPD power-down
cycle prior to starting conversions. Take into account
that the reference buffer recharges the bypass capaci-
tor at an 80mV/ms slew rate and add 50s for settling
time. Throughput rates of 10ksps offer typical supply
currents of 470A, using the recommended 33F
capacitor value.
Auto-Shutdown
Selecting STBYPD on every conversion automatically
shuts the MAX197 down after each conversion without
requiring any start-up time on the next conversion.
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
14
______________________________________________________________________________________
OUTPUT CODE
INPUT VOLTAGE (LSB)
0
FS
FS - 3/2 LSB
1 LSB =
FULL-SCALE
TRANSITION
12
3
11... 111
11... 110
11... 101
00... 011
00... 010
00... 001
00... 000
FS
4096
Figure 10. Unipolar Transfer Function
OUTPUT CODE
INPUT VOLTAGE (LSB)
0V
+FS - 1 LSB
1 LSB =
-FS
011... 111
011... 110
000... 001
000... 000
111... 111
100... 010
100... 001
100... 000
2
FS
4096
Figure 11. Bipolar Transfer Function
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX197AENI | 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 |
| MAX197AENI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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 |
| MAX197AEWI | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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 |
| MAX197AEWI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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 |
| MAX197AEWI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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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