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参数资料
| 型号： | MAX1294AEEI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| 中文描述： | 6-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, QSOP-28 |
| 文件页数： | 14/20页 |
| 文件大小： | 226K |
| 代理商： | MAX1294AEEI |
M
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
14
______________________________________________________________________________________
Input Format
The control bit sequence is latched into the device on
pins D7–D0 during a write command. Table 4 shows
the control-byte format.
Output Data Format
The 12-bit-wide output format for both the MAX1294/
MAX1296 is binary in unipolar mode and two’s comple-
ment in bipolar mode.
CS
,
RD, WR, INT
, and the 12 bits
of output data can interface directly to a 16-bit data bus.
When reading the output data,
CS
and
RD
must be low.
__________Applications Information
Power-On Reset
When power is first applied, internal power-on reset cir-
cuitry activates the MAX1294/MAX1296 in external clock
mode and sets
INT
high. After the power supplies stabi-
lize, the internal reset time is 10μs; no conversions
should be attempted during this phase. When using the
internal reference, 500μs is required for V
REF
to stabilize.
Internal and External Reference
The MAX1294/MAX1296 can be used with an internal
or external reference voltage. An external reference
can be connected directly to REF or REFADJ.
An internal buffer is designed to provide +2.5V at REF for
both devices. The internally trimmed +1.22V reference is
buffered with a +2.05V/V gain.
Internal Reference
The full-scale range with the internal reference is +2.5V
with unipolar inputs and ±1.25V with bipolar inputs. The
internal reference buffer allows for small adjustments
(±100mV) in the reference voltage (Figure 7).
Note:
The reference buffer must be compensated with
an external capacitor (4.7μF min) connected between
REF and GND to reduce reference noise and switching
spikes from the ADC. To further minimize reference
noise, connect a 0.01μF capacitor between REFADJ
and GND.
External Reference
With the MAX1294/MAX1296, an external reference can
be placed at either the input (REFADJ) or the output
(REF) of the internal-reference buffer amplifier.
Using the REFADJ input makes buffering the external
reference unnecessary. The REFADJ input impedance
is typically 17k
.
When applying an external reference to REF, disable the
internal reference buffer by connecting REFADJ to V
DD
.
The DC input resistance at REF is 25k
. Therefore, an
external reference at REF must deliver up to 200μA DC
load current during a conversion and have an output
impedance less than 10
. If the reference has higher
output impedance or is noisy, bypass it close to the REF
pin with a 4.7μF capacitor.
Power-Down Modes
To save power, place the converter in a low-current
shutdown state between conversions. Select standby
mode or shutdown mode through bits D6 and D7 of the
control byte (Tables 1, 4). In both software power-down
modes, the parallel interface remains active, but the
ADC does not convert.
Standby Mode
While in standby mode, the supply current is typically
1mA. The part will power up on the next rising edge of
WR
and be ready to perform conversions. This quick
turn-on time allows the user to realize significantly
reduced power consumption for conversion rates
below 420ksps.
D6
D4
D5
PD0
SGL/
DIF
ACQMOD
A2
A0
A1
D2
D0
(LSB)
UNI
/BIP
PD1
D1
D3
D7
(MSB)
Table 4. Control-Byte Format
V
DD
= +5V
330k
50k
50k
0.01μF
4.7μF
REFADJ
REF
MAX1294
MAX1296
Figure 7. Reference Adjustment with External Potentiometer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1294AEEI+ | 功能描述:模数转换器 - ADC 12-Bit 6Ch 420ksps 5.5V 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 |
| MAX1294AEEI+T | 功能描述:模数转换器 - ADC 12-Bit 6Ch 420ksps 5.5V 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 |
| MAX1294AEEI-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 |
| MAX1294BCEI | 功能描述:模数转换器 - ADC 12-Bit 6Ch 420ksps 5.5V 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 |
| MAX1294BCEI+ | 功能描述:模数转换器 - ADC 12-Bit 6Ch 420ksps 5.5V 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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