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参数资料
| 型号： | MAX1245BCAP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SERIAL 20-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 66 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.4mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个差分，单极；4 个差分，双极 |
also specify the clock mode. When software shutdown is
asserted, the ADC continues to operate in the last speci-
fied clock mode until the conversion is complete. Then the
ADC powers down into a low quiescent-current state. In
internal clock mode, the interface remains active and con-
version results can be clocked out after the MAX1245 has
entered a software power-down.
The first logical 1 on DIN is interpreted as a start bit, and
powers up the MAX1245. Following the start bit, the data
input word or control byte also determines clock mode
and power-down states. For example, if the DIN word
contains PD1 = 1, the chip remains powered up. If PD0 =
PD1 = 0, a power-down resumes after one conversion.
Hardware Power-Down
Pulling SHDN low places the converter in hardware
power-down. Unlike the software power-down mode, the
conversion is not completed; it stops coincidentally with
SHDN being brought low. SHDN also controls the clock
frequency in internal clock mode. Letting SHDN be open
sets the internal clock frequency to 1.5MHz. When
returning to normal operation with SHDN open, there is a
tRC delay of approximately 2M
x CL, where CL is the
capacitive loading on the SHDN pin. Pulling SHDN high
sets the internal clock frequency to 225kHz. This feature
eases the settling-time requirement for the reference
voltage.
External Reference
An external reference is required for the MAX1245. The
reference voltage range is 1V to VDD.
At VREF, the input impedance is a minimum of 18k
for
DC currents. During a conversion, the reference must
be able to deliver up to 250A DC load current and
have an output impedance of 10
or less. If the refer-
ence has higher output impedance or is noisy, bypass
it close to the VREF pin with a 0.1F capacitor.
Transfer Function
Table 6 shows the full-scale voltage ranges for unipolar
and bipolar modes using a 2.048V reference.
The external reference must have a temperature coefficient
of 4ppm/°C or less to achieve accuracy to within 1LSB over
the commercial temperature range of 0°C to +70°C.
Figure 14 depicts the nominal, unipolar input/output
(I/O) transfer function, and Figure 15 shows the bipolar
input/output transfer function. Code transitions occur
halfway between successive-integer LSB values.
Output coding is binary, with 1LSB = 500V (2.048V /
4096) for unipolar operation and 1LSB = 500V
[(2.048V / 2 - -2.048V / 2) / 4096] for bipolar operation.
Layout, Grounding, and Bypassing
For best performance, use printed circuit boards.
Wire-wrap boards are not recommended. Board layout
should ensure that digital and analog signal lines are
separated from each other. Do not run analog and digi-
tal (especially clock) lines parallel to one another, or
digital lines underneath the ADC package.
Figure 16 shows the recommended system ground
connections. A single-point analog ground (“star”
ground point) should be established at AGND, sepa-
rate from the logic ground. Connect all other analog
grounds and DGND to the star ground. No other digital
system ground should be connected to this ground.
The ground return to the power supply for the star
MAX1245
+2.375V, Low-Power, 8-Channel,
Serial 12-Bit ADC
16
______________________________________________________________________________________
100
1000
0.1
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
10
1
CONVERSIONS PER CHANNEL PER SECOND (Hz)
I
DD
(
A)
10
11k
10k
100
100k
MAX1245-13
1 CHANNEL
8 CHANNELS
VDD = VREF = 2.5V
CODE = 101010100000
RL =
∞
Figure 13. Average Supply Current vs. Conversion Rate
Table 6. Full Scale and Zero Scale
UNIPOLAR MODE
BIPOLAR MODE
Full Scale
Zero Scale
Positive
Zero
Negative
Full Scale
Scale
Full Scale
VREF + COM
COM
VREF/2
COM
-VREF/2
+ COM
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1245BCAP+ | 功能描述:模数转换器 - ADC 10-Bit 8Ch 100ksps 3.3V 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 |
| MAX1245BCAP+T | 功能描述:模数转换器 - ADC 10-Bit 8Ch 100ksps 3.3V 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 |
| MAX1245BCAP-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 |
| MAX1245BCPP | 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 |
| MAX1245BCPP+ | 功能描述:模数转换器 - ADC 10-Bit 8Ch 100ksps 3.3V 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 |
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