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参数资料
| 型号： | MAX1202AEAP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH 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）： | 133k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 640mW |
| 电压电源： | 双 ± |
| 工作温度： | -40°C ~ 85°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 |
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
20
______________________________________________________________________________________
Figure 14a. MAX1202 Supply Current vs. Sample Rate/Second,
FULLPD, 400kHz Clock
Figure 14b. MAX1202/MAX1203 Supply Current vs. Sample
Rate/Second, FASTPD, 2MHz Clock
External Reference
With both the MAX1202 and MAX1203, an external refer-
ence can be placed at either the input (REFADJ) or the
output (REF) of the internal reference-buffer amplifier. The
REFADJ input impedance is typically 20k
for the
MAX1202, and higher than 100k
for the MAX1203,
where the internal reference is omitted. At REF, the DC
input resistance is a minimum of 12k
. During conversion,
an external reference at REF must deliver up to 350A DC
load current and have an output impedance of 10
or
less. If the reference has higher output impedance or is
noisy, bypass it close to the REF pin with a 4.7F capacitor.
Using the buffered REFADJ input makes buffering of the
external reference unnecessary. When connecting an
external reference directly at REF, disable the internal
buffer by tying REFADJ to VDD. In power-down, the input
bias current to REFADJ can be as much as 25A with
REFADJ tied to VDD (MAX1202 only). Pull REFADJ to
GND to minimize the input bias current in power-down.
Transfer Function and Gain Adjust
Figure 15 depicts the nominal, unipolar input/output
(I/O) transfer function, and Figure 16 shows the bipolar
I/O transfer function. Code transitions occur halfway
between successive-integer LSB values. Output coding
is binary with 1LSB = 1.00mV (4.096V/4096) for unipo-
lar operation, and 1LSB = 1.00mV [(4.096V/2 - -4.096V/
2)/4096] for bipolar operation.
Figure 17 shows how to adjust the ADC gain in applica-
tions that use the internal reference. The circuit provides
±1.5% (±65LSBs) of gain adjustment range.
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 18 shows the recommended system ground
connections. Establish a single-point analog ground
1000
1
0
100
300
500
FULL POWER-DOWN
10
100
MAX186-14A
CONVERSIONS PER CHANNEL PER SECOND
200
400
2ms FASTPD WAIT
400kHz EXTERNAL CLOCK
INTERNAL COMPENSATION
50
150
250
350
450
8 CHANNELS
1 CHANNEL
AVERAGE
SUPPLY
CURRENT
(A)
10,000
10
0
MAX1202/MAX1203
FAST POWER-DOWN
100
1000
CONVERSIONS PER CHANNEL PER SECOND
2k
8 CHANNELS
1 CHANNEL
4k
6k
8k
10k
12k
14k
16k
18k
2MHz EXTERNAL CLOCK
EXTERNAL COMPENSATION
50s WAIT
AVERAGE
SUPPLY
CURRENT
(A)
3.0
2.5
2.0
1.5
1.0
0.5
0
0.0001
0.001
0.01
0.1
1
10
TIME IN SHUTDOWN (sec)
POWER-UP
DELAY
(ms)
Figure 14c. Typical Power-Up Delay vs. Time in Shutdown
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1202AEAP+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5V 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 |
| MAX1202AEAP+T | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5V 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 |
| MAX1202AEAP-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 |
| MAX1202AEPP | 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 |
| MAX1202AEPP+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5V 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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