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参数资料
| 型号： | MAX191ACWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 100KSPS 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | MICROWIRE?，并联，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 941mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
_______________Detailed Description
The MAX191 uses successive approximation and input
track/hold (T/H) circuitry to convert an analog input sig-
nal to a 12-bit digital output. Flexible control logic pro-
vides easy interface to microprocessors (Ps), so most
applications require only the addition of passive com-
ponents. No external hold capacitor is required for the
T/H. Figure 3 shows the MAX191 in its simplest opera-
tional configuration.
Pseudo-Differential Input
The sampling architecture of the ADC’s analog com-
parator is illustrated in the Equivalent Input Circuit
(Figure 4). A capacitor switching between the AIN+
and AIN- inputs acquires the signal at the ADC’s ana-
log input. At the end of the conversion, the capacitor
reconnects to AIN+ and charges to the input signal.
An external input buffer is usually not needed for low-
bandwidth input signals (<100Hz) because the ADC
disconnects from the input during the conversion. In
unbuffered applications, an input filter capacitor
reduces conversion noise, but also may limit input
bandwidth.
When converting a single-ended input signal, AIN-
should be connected to AGND. If a differential signal is
connected, consider that the configuration is pseudo
differential—only the signal side to the input channel is
held by the T/H. The return side (AIN-) must remain sta-
ble within ±0.5LSB (±0.1LSB for best results) with
respect to AGND during a conversion. Accomplish this
by connecting a 0.1F capacitor from AIN- to AGND.
Analog Input—Track/Hold
The T/H enters its tracking mode when the ADC is des-
elected (CS pin is held high and BUSY pin is high).
Hold mode starts approximately 25ns after a conver-
sion is initiated. The variation in this delay from one
conversion to the next (aperture jitter) is about 50ps.
Figures 6–10 detail the T/H and interface timing for the
MAX191
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
8
_______________________________________________________________________________________
DN
3k
CL
DGND
+5V
3k
DN
CL
DGND
a. High-Z to VOH and VOL to VOH
b. High-Z to VOL and VOH to VOL
Figure 1. Load Circuits for Access Time
DN
3k
10pF
DGND
+5V
3k
DN
10pF
DGND
a. VOH to High-Z
b. VOL to High-Z
Figure 2. Load Circuits for Bus-Relinquish Time
1
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PD
AIN+
AIN-
VREF
REFADJ
AGND
BIP
BUSY
DO/DB
D1/D9
DGND
VSS
2
VDD
CLK/SCLK
PAR
HBEN
CS
RD
D7/DOUT
D6/SCLKOUT
D5/SSTRB
D4
D3/D11
D2/D10
OPEN
OUTPUT
STATUS
4.7
F
0.1
F
0.1
F
0V TO -5V
+5V
SERIAL/PARALLEL
INTERFACE MODE
P CONTROL
INPUTS
MAX191
C1
NOTE: C1 120pF GENERATES 1MHz NOMINAL CLOCK.
P DATA BUS
Figure 3. Operational Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX191ACWG+ | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191ACWG+T | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191ACWG-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 |
| MAX191AENG | 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 |
| MAX191AENG+ | 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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