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| 型号： | MAX1225ETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 1.5MSPS 12-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 位数： | 12 |
| 采样率（每秒）： | 1.5M |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 18mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°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： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
MAX1224/MAX1225
1.5Msps, Single-Supply, Low-Power,
True-Differential, 12-Bit ADCs
_______________________________________________________________________________________
9
Detailed Description
The MAX1224/MAX1225 use an input T/H and succes-
sive-approximation register (SAR) circuitry to convert
an analog input signal to a digital 12-bit output. The
serial interface requires only three digital lines (SCLK,
CNVST, and DOUT) and provides easy interfacing to
microprocessors (Ps) and DSPs. Figure 3 shows the
simplified internal structure for the MAX1224/MAX1225.
True-Differential Analog Input T/H
The equivalent circuit of Figure 4 shows the input archi-
tecture of the MAX1224/MAX1225, 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 con-
verted. The time required for the T/H to acquire an input
signal is determined by how quickly its input capaci-
tance is charged. If the input signal’s source imped-
ance 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 follow-
ing equation:
tACQ
≥ 9 x (RS + RIN) x 16pF
where RIN = 200
Ω, and RS is the source impedance of
the input signal.
Note: tACQ is never less than 125ns, 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 15MHz small-
signal bandwidth, making it possible to digitize high-
speed transient events and measure periodic
signals with bandwidths exceeding the ADC’s sam-
pling rate by using undersampling techniques. To
avoid high-frequency signals being aliased into the fre-
quency band of interest, anti-alias filtering is recom-
mended.
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.
RGND
AIN+
GND
DOUT
SCLK
CNVST
CONTROL
LOGIC AND
TIMING
AIN-
VL
VDD
REF
12-BIT
SAR
ADC
MAX1224
MAX1225
T/H
OUTPUT
BUFFER
Figure 3. Functional Diagram
CIN+
RIN+
RIN-
CIN-
VAZ
AIN+
AIN-
CONTROL
LOGIC
CAPACITIVE
DAC
COMP
ACQUISITION MODE
CIN+
RIN+
RIN-
CIN-
VAZ
AIN+
AIN-
CONTROL
LOGIC
CAPACITIVE
DAC
COMP
HOLD/CONVERSION MODE
Figure 4. Equivalent Input Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1225ETC+ | 功能描述:模数转换器 - ADC 12-Bit 1.5Msps 3.6V 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 |
| MAX1225ETC+T | 功能描述:模数转换器 - ADC 12-Bit 1.5Msps 3.6V 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 |
| MAX1225ETC-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 |
| MAX1226ACEE | 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 |
| MAX1226ACEE+ | 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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