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参数资料
| 型号： | MAX1285 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| 中文描述： | 400ksps/300ksps、单电源、低功耗、串行12位ADC，内置电压基准 |
| 文件页数： | 9/15页 |
| 文件大小： | 210K |
| 代理商： | MAX1285 |
M
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
_______________________________________________________________________________________
9
side of C
HOLD
switches back to AIN, and C
HOLD
charges to the input signal again.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal
’
s source impedance is high,
the acquisition time lengthens and more time must be
allowed between conversions. The acquisition time
(t
ACQ
) is the maximum time the device takes to acquire
the signal, and is also the minimum time needed for the
signal to be acquired. Acquisition time is calculated by:
t
ACQ
= 9(R
S
+ R
IN
) x 12pF,
where R
IN
= 800
, R
S
= the input signal
’
s source
impedance, and t
ACQ
is never less than 468ns
(MAX1284) or 625ns (MAX1285). Source impedances
below 2k
do not significantly affect the ADCs AC per-
formance.
Higher source impedances can be used if a 0.01μF
capacitor is connected to the analog input. Note that
the input capacitor forms an RC filter with the input
source impedance, limiting the ADCs input signal
bandwidth.
Input Bandwidth
The ADCs
’
input tracking circuitry has a 6MHz
(MAX1284) or 3MHz (MAX1285) small-signal band-
width, so it is possible to digitize high-speed transient
events and measure periodic signals with bandwidths
exceeding the ADC
’
s sampling rate, by using under-
sampling techniques. To avoid aliasing of unwanted
high-frequency signals into the frequency band of inter-
est, anti-alias filtering is recommended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and GND, allow the input to swing from
GND - 0.3V to V
DD
+ 0.3V without damage.
If the analog input exceeds 50mV beyond the sup-
plies, limit the input current to 2mA.
Internal Reference
The MAX1284/MAX1285 have an on-chip voltage refer-
ence trimmed to 2.5V. The internal reference output is
connected to REF and also drives the internal capaci-
tive DAC. The output can be used as a reference volt-
age source for other components and can source up to
800μA. Bypass REF with a 4.7μF capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see the
Using SHDN to Reduce Supply Current
section). The internal reference is disabled in shutdown
(
SHDN
= 0).
Serial Interface
Initialization after Power-Up and
Starting a Conversion
When power is first applied, and if
SHDN
is not pulled
low, it takes the fully discharged 4.7μF reference
bypass capacitor up to 2ms to provide adequate
charge for specified accuracy. No conversions should
be performed during this time.
C
HOLD
12pF
R
IN
800
HOLD
C
SWITCH
*
6pF
*INCLUDES ALL INPUT PARASITICS
AIN
REF
GND
ZERO
AUTOZERO
RAIL
COMPARATOR
CAPACITIVE DAC
TRACK
SHUTDOWN
INPUT
ANALOG INPUT
0 TO V
REF
+5V OR +3V
1
2
3
4
V
DD
AIN
SHDN
REF
8
7
6
5
SCLK
CS
DOUT
GND
SERIAL
INTERFACE
4.7
μ
F
10
μ
F
0.1
μ
F
MAX1284
MAX1285
Figure 3. Typical Operating Circuit
Figure 4. Equivalent Input Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1285BCSA | 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 |
| MAX1285BCSA+ | 功能描述:模数转换器 - ADC 12-Bit 300ksps 3.6V 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 |
| MAX1285BCSA+T | 功能描述:模数转换器 - ADC 12-Bit 300ksps 3.6V 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 |
| MAX1285BCSA-T | 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 |
| MAX1285BESA | 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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