参数资料
| 型号： | MAX1112EPP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT LP 20-DIP |
| 标准包装： | 18 |
| 位数： | 8 |
| 采样率（每秒）： | 50k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 680µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个伪差分，单极；4 个伪差分，双极 |
MAX1112/MAX1113
+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
10
______________________________________________________________________________________
Table 3. Control-Byte Format
START
SEL2
SEL1
SEL0
UNI/BIP
SGL/DIF
PD1
PD0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(MSB)
(LSB)
NAME
SGL/DIF
2
BIT
1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-
ended mode, input signal voltages are referred to COM. In differential mode, the voltage differ-
ence between two channels is measured (Tables 1 and 2).
DESCRIPTION
UNI/BIP
3
START
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode (Table 4).
PD0
0 (LSB)
7 (MSB)
1 = external clock mode, 0 = internal clock mode.
Selects external or internal clock mode.
The first logic “1” bit after CS goes low defines the beginning of the control byte.
SEL2
SEL1
SEL0
6
5
4
Select which of the input channels are to be used for the conversion (Tables 1 and 2).
PD1
1
1 = fully operational, 0 = power-down.
Selects fully operational or power-down mode.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens, and more time must be
allowed between conversions. The acquisition time,
tACQ, is the minimum time needed for the signal to be
acquired. It is calculated by:
tACQ = 6 x (RS + RIN) x 18pF
where RIN = 6.5k
Ω, RS = the source impedance of the
input signal, and tACQ is never less than 1s. Note that
source impedances below 2.4k
Ω do not significantly
affect the AC performance of the ADC.
Input Bandwidth
The ADC’s input tracking circuitry has a 1.5MHz small-
signal bandwidth, so it is possible to digitize high-
speed transient events and measure periodic signals
with bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid high-
frequency signals being aliased into the frequency
band of interest, anti-alias filtering is recommended.
Analog Inputs
Internal protection diodes, which clamp the analog
input to VDD and AGND, allow the channel input pins to
swing from (AGND - 0.3V) to (VDD + 0.3V) without dam-
age. However, for accurate conversions near full scale,
the inputs must not exceed VDD by more than 50mV or
be lower than AGND by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, do not forward bias the protection diodes of
off channels over 2mA.
The MAX1112/MAX1113 can be configured for differen-
tial or single-ended inputs with bits 2 and 3 of the con-
trol byte (Table 3). In single-ended mode, analog inputs
are internally referenced to COM with a full-scale input
range from COM to VREFIN + COM. For bipolar opera-
tion, set COM to VREFIN/2.
In differential mode, choosing unipolar mode sets the
differential input range at 0V to VREFIN. In unipolar
mode, the output code is invalid (code zero) when a
negative differential input voltage is applied. Bipolar
mode sets the differential input range to ±VREFIN/2.
Note that in this mode, the common-mode input range
includes both supply rails. See Table 4 for input voltage
ranges.
Quick Look
To quickly evaluate the MAX1112/MAX1113’s analog
performance, use the circuit of Figure 5. The
MAX1112/MAX1113 require a control byte to be written
to DIN before each conversion. Tying DIN to +5V feeds
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1112EPP+ | 功能描述:模数转换器 - ADC 5V Low-Power Multi Ch Serial 8-Bit RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1112EVKIT | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX1110/MAX1112 |
| MAX1112-MAX1113 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V, Low-Power, Multi-Channel, Serial 8-Bit ADCs |
| MAX1112MJP | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1113 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V, Low-Power, Multi-Channel, Serial 8-Bit ADCs |
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