参数资料
| 型号： | MAX199BCAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 8CH 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 100k |
| 数据接口： | 并联 |
| 电压电源： | 单电源 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
MAX199
Multi-Range (±4V, ±2V, +4V, +2V),
+5V Supply, 12-Bit DAS with 8+4 Bus Interface
8
_______________________________________________________________________________________
_______________Detailed Description
Converter Operation
The MAX199, a multi-range, fault-tolerant ADC, uses
successive approximation and internal input track/hold
(T/H) circuitry to convert an analog signal to a 12-bit
digital output. The parallel-output format provides easy
interface to microprocessors (Ps). Figure 3 shows the
MAX199 in its simplest operational configuration.
Analog-Input Track/Hold
In the internal acquisition control mode (control bit D5
set to 0), the T/H enters its tracking mode on WR’s ris-
ing edge, and enters its hold mode when the internally
timed (6 clock cycles) acquisition interval ends. In bipo-
lar mode, a low-impedance input source, which settles
in less than 1.5s, is required to maintain conversion
accuracy at the maximum conversion rate.
When configured for unipolar mode, the input does not
need to be driven from a low-impedance source. The
acquisition time (tAZ) is a function of the source output
resistance (RS), the channel input resistance (RIN), and
the T/H capacitance.
Acquisition time is calculated by:
For 0V to VREF: tAZ = 9 x (RS + RIN) x 16pF
For 0V to VREF/2: tAZ = 9 x (RS + RIN) x 32pF
where RIN = 7k
, and tAZ is never less than 2s (0V to
VREF range) or 3s (0V to VREF/2 range).
In the external acquisition control mode (D5 = 1), the
T/H enters its tracking mode on the first WR rising edge
and enters its hold mode when it detects the second WR
rising edge with D5 = 0. See the
External Acquisition
section.
Input Bandwidth
The ADC’s input tracking circuitry has a 5MHz small-
signal bandwidth. When using the internal acquisition
mode with an external clock frequency of 2MHz, a
100ksps throughput rate can be achieved. 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 fre-
quency band of interest, anti-alias filtering is recom-
mended (MAX274/MAX275 continuous-time filters).
Input Range and Protection
Figure 4 shows the equivalent input circuit. The MAX199
can be programmed for input ranges of ±VREF, ±VREF/2,
0V to VREF, or 0V to VREF/2 by setting the appropriate
control bits (D3, D4) in the control byte (see Tables 1 and
2). When an external reference is applied at REFADJ, the
voltage at REF is given by VREF = 1.6384 x VREFADJ (2.4V
< VREF < 4.18V).
DGND
VDD
REF
REFADJ
INT
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
AGND
28
27
26
4.7
F
0.1
F
+5V
+4.096V
OUTPUT STATUS
25
24
23
22
21
20
19
18
17
16
1
2
P
CONTROL
INPUTS
3
4
5
6
CLK
CS
WR
RD
HBEN
SHDN
D7
D6
D5
D4
D3/D11
D2/D10
D1/D9
D0/D8
100pF
P DATA BUS
15
7
8
9
10
11
12
13
14
ANALOG
INPUTS
MAX199
Figure 3. Operational Diagram
5.12k
CH_
S1
S2
S3
S4
BIPOLAR
UNIPOLAR
VOLTAGE
REFERENCE
T/H
OUT
HOLD
TRACK
HOLD
OFF
ON
CHOLD
S1 = BIPOLAR/UNIPOLAR SWITCH
S2 = INPUT MUX SWITCH
S3, S4 = T/H SWITCH
Figure 4. Equivalent Input Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX199BCAI+ | 功能描述:模数转换器 - ADC 12Bit 8Ch 100ksps 4.18V 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 |
| MAX199BCAI+T | 功能描述:模数转换器 - ADC 12Bit 8Ch 100ksps 4.18V 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 |
| MAX199BCAI-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 |
| MAX199BCNI | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX199BCNI+ | 功能描述:模数转换器 - ADC 12Bit 8Ch 100ksps 4.18V 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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