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參數資料
| 型號： | MAX1111 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs |
| 中文描述： | +2.7V、低功耗、多通道、串行8位ADC |
| 文件頁數： | 13/20頁 |
| 文件大?。?/td> | 284K |
| 代理商： | MAX1111 |
M
+2.7V, Low-Power, Multic hannel,
S erial 8-Bit ADCs
______________________________________________________________________________________
13
Digital Output
In unipolar input mode, the output is straight binary
(Figure 15). For bipolar inputs, the output is two’s-com-
plement (Figure 16). Data is clocked out at SCLK’s
falling edge in MSB-first format.
Cloc k Modes
The MAX1110/MAX1111 can use either an external ser-
ial clock or the internal clock to perform the successive-
approximation conversion. In both clock modes, the
external clock shifts data in and out of the devices. Bit
PD0 of the control byte programs the clock mode.
Figures 8–11 show the timing characteristics common
to both modes.
External Clock
In external clock mode, the external clock not only
shifts data in and out, it also drives the analog-to-digital
conversion steps. SSTRB pulses high for two clock
periods after the last bit of the control byte. Successive-
approximation bit decisions are made and appear at
DOUT on each of the next eight SCLK falling edges
(Figure 7). After the eight data bits are clocked out,
subsequent clock pulses clock out zeros from the
DOUT pin.
SSTRB and DOUT go into a high-impedance state
when
CS
goes high; after the next
CS
falling edge,
SSTRB outputs a logic low. Figure 9 shows the SSTRB
timing in external clock mode.
The conversion must complete in 1ms, or droop on the
sample-and-hold capacitors may degrade conversion
results. Use internal clock mode if the serial-clock fre-
quency is less than 50kHz, or if serial-clock interruptions
could cause the conversion interval to exceed 1ms.
CS
SCLK
DIN
DOUT
t
CSH
t
CSS
t
CL
t
DS
t
DH
t
DV
t
DO
t
CH
t
DO
t
TR
t
CSH
Figure 8. Detailed Serial-Interface Timing
t
SDV
t
SSTRB
PD0 CLOCKED IN
t
STR
SSTRB
SCLK
CS
t
SSTRB
Figure 9. External Clock Mode SSTRB Detailed Timing
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX11110 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:2Msps/3Msps, Low-Power, Serial 12-/10-/8-Bit ADCs |
| MAX11110AUT+ | 制造商:Maxim Integrated Products 功能描述:SMALL, 2.2V TO 3.6V, LOW-POWER, 1-/2-CHANNEL, SERIAL, 8-/10- - Rail/Tube |
| MAX11110AUT+T | 功能描述:模數轉換器 - ADC 10Bit 1Ch 2Msps Serial RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX11111 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:2Msps/3Msps, Low-Power, Serial 12-/10-/8-Bit ADCs |
| MAX11111ATB+ | 制造商:Maxim Integrated Products 功能描述:SMALL, 2.2V TO 3.6V, LOW-POWER, 1-/2-CHANNEL, SERIAL, 8-/10- - Rail/Tube |
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