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参数资料
| 型号： | MAX1278CTC+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 1.8MSPS 12-TQFN |
| 标准包装： | 2,500 |
| 位数： | 12 |
| 采样率（每秒）： | 1.8M |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1.35W |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
MAX1276/MAX1278
True-Differential Analog Input T/H
The equivalent circuit of Figure 4 shows the input archi-
tecture of the MAX1276/MAX1278, which is composed
of a T/H, a comparator, and a switched-capacitor digi-
tal-to-analog converter (DAC). The T/H enters its track-
ing mode on the 14th SCLK rising edge of the previous
conversion. Upon power-up, the T/H enters its tracking
mode immediately. The positive input capacitor is con-
nected to AIN+. The negative input capacitor is con-
nected to AIN-. The T/H enters its hold mode on the
falling edge of CNVST and the difference between the
sampled positive and negative input voltages is convert-
ed. The time required for the T/H to acquire an input sig-
nal is determined by how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens. The acquisition time,
tACQ, is the minimum time needed for the signal to be
acquired. It is calculated by the following equation:
tACQ
≥ 9 × (RS + RIN) × 16pF
where RIN = 200
Ω, and RS is the source impedance of
the input signal.
Note: tACQ is never less than 104ns and any source
impedance below 12
Ω does not significantly affect the
ADC’s AC performance.
Input Bandwidth
The ADC’s input-tracking circuitry has a 20MHz small-
signal bandwidth, making it 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 Input Protection
Internal protection diodes that clamp the analog input
to VDD and GND allow the analog input pins to swing
from GND - 0.3V to VDD + 0.3V without damage. Both
inputs must not exceed VDD or be lower than GND for
accurate conversions.
Serial Interface
Initialization After Power-Up
and Starting a Conversion
Upon initial power-up, the MAX1276/MAX1278 require a
complete conversion cycle to initialize the internal cali-
bration. Following this initial conversion, the part is ready
for normal operation. This initialization is only required
after a hardware power-up sequence and is not required
after exiting partial or full power-down mode.
To start a conversion, pull CNVST low. At CNVST’s
falling edge, the T/H enters its hold mode and a conver-
sion is initiated. SCLK runs the conversion and the data
can then be shifted out serially on DOUT.
1.8Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
10
______________________________________________________________________________________
DOUT
MODE
SCLK
CNVST
DOUT GOES HIGH IMPEDANCE ONCE CNVST GOES HIGH
CNVST MUST GO HIGH AFTER THE 3RD BUT BEFORE THE 14TH SCLK RISING EDGE
ONE 8-BIT TRANSFER
1ST SCLK RISING EDGE
PPD
0
D11
D10
D9
D8
D7
NORMAL
REF
ENABLED (4.096V)
Figure 6. SPI Interface—Partial Power-Down Mode
Figure 5. Interface-Timing Sequence
tACQUIRE
CONTINUOUS-CONVERSION
SELECTION WINDOW
CNVST
tSETUP
DOUT
SCLK
414
12
8
3
16
HIGH IMPEDANCE
D1
D4
D6
D5
D9
D8
D7
D11
D10
POWER-MODE SELECTION WINDOW
D0
D2
D3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1278ETC | 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 |
| MAX1278ETC+ | 功能描述:模数转换器 - ADC 12-Bit 1.8Msps 4.096V Precision 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 |
| MAX1278ETC+T | 功能描述:模数转换器 - ADC 12-Bit 1.8Msps 4.096V Precision 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 |
| MAX1278ETC-T | 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 |
| MAX1279ACTC | 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 |
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