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參數(shù)資料
| 型號： | MAX1292 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| 中文描述： | 400ksps、+5V、8/4通道、12位ADC，帶有+2.5V電壓基準及并行接口 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 382K |
| 代理商： | MAX1292 |
___________Applications Information
Power-On Reset
When power is first applied, internal power-on reset cir-
cuitry activates the MAX1290/MAX1292 in external
clock mode and sets
INT
high. After the power supplies
stabilize, the internal reset time is 10μs, and no conver-
sions should be attempted during this phase. When
using the internal reference, 500μs are required for
V
REF
to stabilize.
Internal and External Reference
The MAX1290/MAX1292 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 refer-
ence 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 MAX1290/MAX1292, 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 refer-
ence 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 using bits D6 and D7 of the
control byte (Tables 1 and 2). 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 1mA (typ).
The part powers up on the next rising edge on
WR
and
is ready to perform conversions. This quick turn-on time
allows the user to realize significantly reduced power
consumption for conversion rates below 400ksps.
Shutdown Mode
Shutdown mode turns off all chip functions that draw
quiescent current, reducing the typical supply current
to 2μA immediately after the current conversion is com-
pleted. A rising edge on
WR
causes the MAX1290/
MAX1292 to exit shutdown mode and return to normal
operation. To achieve full 12-bit accuracy with a 4.7μF
reference bypass capacitor, 500μs is required after
power-up. Waiting 500μs in standby mode, instead of in
full-power mode, can reduce power consumption by a
factor of 3 or more. When using an external reference,
M
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
______________________________________________________________________________________
15
Table 5. Data-Bus Output (8 + 4 Parallel
Interface)
V
DD
= +5V
330k
50k
GND
50k
0.01
μ
F
4.7
μ
F
REFADJ
REF
MAX1290
MAX1292
Figure 7. Reference Voltage Adjustment with External
Potentiometer
PIN
D0
D1
D2
D3
HBEN = 0
Bit 0 (LSB)
Bit 1
Bit 2
Bit 3
HBEN = 1
Bit 8
Bit 9
Bit 10
Bit 11 (MSB)
BIPOLAR
(UNI/
BIP
= 0)
UNIPOLAR
(UNI/
BIP
= 1)
D4
D5
D6
D7
Bit 4
Bit 5
Bit 6
Bit 7
Bit 11
Bit 11
Bit 11
Bit 11
0
0
0
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1292ACEG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1292ACEG+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 400ksps 5.5V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1292ACEG+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 400ksps 5.5V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1292ACEG-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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1292AEEG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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