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| 型號(hào)： | MAX1314ECM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs with 【10V, 【5V, and 0 to +5V Analog Input Ranges |
| 中文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBC, TQFP-48 |
| 文件頁數(shù)： | 26/36頁 |
| 文件大?。?/td> | 487K |
| 代理商： | MAX1314ECM |
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M
8-/4-/2-Channel,12-Bit,Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
26
______________________________________________________________________________________
To avoid the timing requirements associated with pow-
ering up an analog channel, force
CHSHDN
high. With
CHSHDN
high, each analog input is powered up
regardless of whether it is selected for conversion in
the configuration register. Note that shutdown mode
takes precedence over the
CHSHDN
mode.
Reference
Internal Reference
The internal reference circuits provide for analog input
voltages of 0 to +5V for the unipolar MAX1304/
MAX1305/MAX1306, ±5V for the bipolar MAX1308/
MAX1309/MAX1310 or ±10V for the bipolar MAX1312/
MAX1313/MAX1314. Install external capacitors for ref-
erence stability, as indicated in Table 3 and shown in
Figures 3 and 4.
As illustrated in Figure 2, the internal reference voltage
is 2.5V (V
REF
). This 2.5V is internally buffered to create
the voltages at REF+ and REF-. Table 4 shows the volt-
ages at COM, REF+, and REF-.
External Reference
External reference operation is achieved by overriding
the internal reference voltage. Override the internal ref-
erence voltage by driving REF with a +2.0V to +3.0V
external reference. As shown in Figure 2, the REF input
impedance is 5k
. For more information about using
external references see the
Transfer Functions
section.
Midscale Voltage (MSV)
The voltage at MSV (V
MSV
) sets the midpoint of the ADC
transfer functions. For the 0 to +5V input range (unipolar
devices), the midpoint of the transfer function is +2.5V.
For the ±5V and ±10V input range devices, the midpoint
of the transfer function is zero.
As shown in Figure 2, there is a unity-gain buffer
between REF
MS
and MSV in the unipolar MAX1304/
MAX1305/MAX1306. This midscale buffer sets the mid-
point of the unipolar transfer functions to either the inter-
nal +2.5V reference or an externally applied voltage at
REF
MS
. V
MSV
follows V
REFMS
within ±3mV.
The midscale buffer is not active for the bipolar
devices. For these devices, MSV must be connected to
AGND or externally driven. REF
MS
must be bypassed
with a 0.01μF capacitor to AGND.
See the
Transfer Functions
section for more information
about MSV.
Table 3. Reference Bypass Capacitors
INPUT VOLTAGE RANGE
LOCATION
UNIPOLAR (μF)
2.2 || 0.1
0.01
0.01
0.1
2.2 || 0.1
0.1
2.2 || 0.1
BIPOLAR (μF)
N/A
0.01
0.01
0.1
2.2 || 0.1
0.1
2.2 || 0.1
MSV Bypass Capacitor to AGND
REF
MS
Bypass Capacitor to AGND
REF Bypass Capacitor to AGND
REF+ Bypass Capacitor to AGND
REF+ to REF- Capacitor
REF- Bypass Capacitor to AGND
COM Bypass Capacitor to AGND
Table 4. Reference Voltages
PARAMETER
EQUATION
CALCULATED VALUE (V)
V
REF
= 2.000V,
AV
DD
= 5.0V
(
CALCULATED VALUE (V)
V
REF
= 2.500V,
AV
DD
= 5.0V
CALCULATED VALUE (V)
V
REF
= 3.000V,
AV
DD
= 5.0V
V
COM
V
REF+
V
REF-
V
COM
= 13 / 25 x AV
DD
V
REF+
= V
COM
+ V
REF
/ 2
V
REF-
= V
COM
- V
REF
/ 2
V
REF-
- V
REF+
= V
REF
2.600
3.600
1.600
2.000
2.600
3.850
1.350
2.500
2.600
4.100
1.100
3.000
V
REF+
- V
REF-
)
)
N/A = Not applicable. Connect MSV directly to AGND.
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| MAX1310ECM | 8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs with 【10V, 【5V, and 0 to +5V Analog Input Ranges |
| MAX1312ECM | 8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs with 【10V, 【5V, and 0 to +5V Analog Input Ranges |
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| MAX1314ECM+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 2Ch 1.075Msps 3V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1314ECM+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 2Ch 1.075Msps 3V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1314ECM-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1315ECM | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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