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參數(shù)資料
| 型號： | MAX1240 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO |
| 中文描述： | +2.7V、低功耗、12位串行ADC，8引腳SO封裝 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 280K |
| 代理商： | MAX1240 |
M
+2.7V, Low-Power,
12-Bit S erial ADCs in 8-Pin S O
10
______________________________________________________________________________________
ed. After an internally timed conversion period, the end
of conversion is signaled by DOUT pulling high. Data
can then be shifted out serially with the external clock.
Using
SHDN
to Reduc e S upply Current
Power consumption can be reduced significantly by
shutting down the MAX1240/MAX1241 between con-
versions. Figure 6 shows a plot of average supply cur-
rent versus conversion rate. Because the MAX1241
uses an external reference voltage (assumed to be pre-
sent continuously), it “wakes up” from shutdown more
quickly (in 4μs) and therefore provides lower average
supply currents. The wake-up time (t
WAKE
) is the time
from when
SHDN
is deasserted to the time when a con-
version may be initiated (Figure 5). For the MAX1240,
this time depends on the time in shutdown (Figure 7)
because the external 4.7μF reference bypass capacitor
loses charge slowly during shutdown.
External Cloc k
The actual conversion does not require the external
clock. This allows the conversion result to be read back
at the μP’s convenience at any clock rate from up to
2.1MHz. The clock duty cycle is unrestricted if each
clock phase is at least 200ns. Do not run the clock
while a conversion is in progress.
T iming and Control
Conversion-start and data-read operations are controlled
by the
CS
and SCLK digital inputs. The timing diagrams
of Figures 8 and 9 outline serial-interface operation.
A
CS
falling edge initiates a conversion sequence: the
T/H stage holds the input voltage, the ADC begins to
convert, and DOUT changes from high impedance to
logic low. SCLK must be kept low during the conver-
sion. An internal register stores the data when the con-
version is in progress.
10
1
0.01
0.0010.1
1
10
100
1k
10k
100k
0.1
CONVERSION RATE (Hz)
S
V
DD =
V
REF
= 3.0V
R
LOAD
=
∞
, C
LOAD
= 50pF
CODE = 010101010000
M
MAX1241
MAX1240
Figure 6. Average Supply Current vs. Conversion Rate
1.0
0.0
0.001
0.01
TIME IN SHUTDOWN
(sec)
0.1
1
10
0.8
0.6
0.4
0.2
P
M
Figure 7. Typical Reference Power-Up Delay vs. Time in
Shutdown
EOC
INTERFACE IDLE
CONVERSION
IN PROGRESS
EOC
0
μ
s
TRAILING
ZEROS
IDLE
CLOCK OUT SERIAL DATA
TRACK/HOLD
STATE
TRACK
HOLD
TRACK
DOUT
B11 B10 B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
SCLK
1
4
8
12
16
7.5
μ
s (t
CONV
)
HOLD
0
μ
s
(t
CS
)
TOTAL = 13.7
μ
s
12.5
×
0.476
μ
s = 5.95
μ
s
CYCLE TIME
CS
0.24
μ
s
Figure 8. Interface Timing Sequence
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1240ACPA | 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1240ACPA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 73ksps 3.6V 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 |
| MAX1240ACSA | 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 |
| MAX1240ACSA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 73ksps 3.6V 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 |
| MAX1240ACSA+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 73ksps 3.6V 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 |
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