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參數(shù)資料
| 型號(hào)： | MAX1317ECM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit Buffers/Drivers With 3-State Outputs 56-SSOP -40 to 85 |
| 中文描述： | 4-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBC, TQFP-48 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大小： | 255K |
| 代理商： | MAX1317ECM |
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M
8-/4-/2-Channel, 14-Bit, Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
______________________________________________________________________________________
15
Cloc k Modes
These devices provide an internal clock of 10MHz
(typ). Alternatively, an external clock can be used.
Internal Clock
Internal-clock mode frees the microprocessor from the
burden of running the ADC conversion clock. For internal-
clock operation, connect INTCLK/
EXTCLK
to AV
DD
and
connect CLK to DGND. Table 1 illustrates the total con-
version time using internal-clock mode.
External Clock
For external-clock operation, connect INTCLK/
EXTCLK
to AGND and connect an external-clock source to CLK.
Note that INTCLK/
EXTCLK
is referenced to the analog
power supply, AV
DD
. The external-clock frequency can
be up to 15MHz, with a duty cycle between 30% and
70%. Clock frequencies of 100kHz and lower can be
used, but the droop in the T/H circuits reduce linearity.
S elec ting an Input Buffer
Most applications require an input buffer to achieve 14-
bit accuracy. Although slew-rate and bandwidth are
important, the most critical specification is settling time.
The sampling requires a relatively brief sampling inter-
val of 150ns. At the beginning of the acquisition, the
internal sampling capacitor array connects to CH_ (the
amplifier output), causing some output disturbance.
Ensure the amplifier is capable of settling to at least 14-
bit accuracy during this interval. Use a low-noise, low-
distortion, wideband amplifier (such as the MAX4350 or
MAX4265), which settles quickly and is stable with the
ADC’s capacitive load (in parallel with any bypass
capacitors on the analog inputs).
Applic ations S ec tion
Digital Interfac e
The bidirectional, parallel, digital interface sets the 8-bit
configuration register (see the
Configuration Register
section) and outputs the 14-bit conversion result. The
interface includes the following control signals: chip
select (
CS
), read (
RD
), write (
WR
), end of conversion
(
EOC
), end of last conversion (
EOLC
), convert start
(CONVST), shutdown (SHDN), all on (ALLON), internal-
clock select (INTCLK /
EXTCLK
), and external-clock input
(CLK). Figures 4, 5, 6, 7, Table 4, and the
Timing
Characteristics
section show the operation of the inter-
face. D0–D7 are bidirectional, and D8–D13 are output
only. All bits are high impedance when
RD
= 1 or
CS
= 1.
Configuration Register
Enable channels as active by writing to the configuration
register through I/O lines D0–D7 (Table 2). The bits in the
configuration register map directly to the channels, with
D0 controlling channel zero, and D7 controlling channel
seven. Setting any bit high activates the corresponding
input channel, while resetting any bit low deactivates the
corresponding channel. Devices with fewer than eight
channels contain some bits that have no function.
Figure 3. Software Channel Wake-Up Timing (ALLON = 0)
CONVST
D0–D7
CLK
WR
EOC
EOLC
LATCH
t
ACQ
t
ACQ
DUMMY
CONVERSION
START
ACTUAL
CONVERSION
START
DATA-IN
DATA-IN CHANGES ONE OR MORE CHANNELS
FROM POWER-DOWN TOACTIVE MODE
1
2
3
4
5
14
15
1
>14 CYCLES
SAMPLE
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| MAX1317ECM+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 4Ch 526ksps 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 |
| MAX1317ECM+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 4Ch 526ksps 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 |
| MAX1317ECM-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 |
| MAX13181EELB+ | 制造商:Maxim Integrated Products 功能描述:LINE TRANSMITTER/RCVR 1TR 1TX 1RX 10PIN UDFN - Rail/Tube |
| MAX13181EELB+T | 功能描述:RS-485接口IC Ic Txrx RS-485 +5.0V Esd RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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