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參數(shù)資料
| 型號(hào)： | MAX1119 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| 中文描述： | 單電源、低功耗、2通道、串行8位ADC |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 406K |
| 代理商： | MAX1119 |
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M
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
12
______________________________________________________________________________________
Applications Information
Power-On Reset
When power is first applied, the MAX1117/MAX1118/
MAX1119 are in AutoShutdown state (<1
μ
A typ). A conver-
sion can be started by toggling CNVST high to low. Powering
up the MAX1117/MAX1118/MAX1119 with CNVST low will
not start a conversion. Conversions initiated prior to the
external reference settling (MAX1118) will result in errors.
Thus, it is necessary to allow the external reference to stabi-
lize prior to initiating a conversion.
AutoShutDown and Supply Current
Requirements
The MAX1117/MAX1118/MAX1119 are designed to
automatically shutdown once a conversion is complete
without any external control. An input sample and con-
version process will typically take 5μs to complete, dur-
ing which time the supply current to the analog
sections of the device is fully on. All analog circuitry is
shutdown after a conversion completes, which results
in a supply current of <1μA (see Shutdown Current vs.
Supply Voltage Plot in the
Typical Operating
Characteristics
). The digital conversion result is main-
tained in a static register and is available for access
through the serial interface at any time.
The power consumption consequence of this architec-
ture is dramatic when relatively slow conversion rates
are needed. For example, at a conversion rate of
10ksps, the average supply current for the MAX1117 is
15μA, while at 1ksps it drops to 1.5μA and at 0.1ksps it
is just 0.3μA, or a miniscule 1μW of power consumption
(see Average Supply Current vs. Conversion Rate Plot
in the
Typical Operating Characteristics
).
External Voltage Reference (MAX1118)
Connect an external reference between +1V and V
DD
at the REF pin. The DC input impedance at REF is
extremely high, consisting of leakage current only
(10nA typ). During a conversion, the reference must be
able to deliver up to 20μA average load current and
have an output impedance of 100
or less. If the refer-
ence has higher output impedance or is noisy, bypass
it close to the REF pin with a 10nF or larger capacitor.
Transfer Function
Figure 7 depicts the input/output transfer function.
Output coding is binary with a +2.048V reference 1LSB
= 8mV (V
REF
/256).
Layout, Grounding, Bypassing
For best performance, the board layout should ensure
that digital and analog signal lines are separated from
each other. Do not run analog and digital (especially
clock) lines parallel to one another or run digital lines
underneath the ADC package.
Figure 8 shows the recommended system-ground con-
nections. A single-point analog ground (star-ground
point) should be established at the ADC ground.
Connect all analog grounds to the star ground. The
ground return to the power supply for the star ground
OUTPUT CODE
FULL-SCALE
TRANSITION
11111111
11111110
11111101
00000011
00000010
00000001
00000000
1
2
3
0
FS
FS - 1 1/2 LSB
FS = V
REF
1LSB = V
REF
256
INPUT VOLTAGE (LSB)
Figure 7. Input/Output Transfer Function
GND
+3V/+5V
SYSTEM POWER SUPPLIES
V
DD
DGND
V
DD
1
μ
F
10
*
0.1
μ
F
GND
*OPTIONAL
DIGITAL
CIRCUITRY
MAX1117
MAX1118
MAX1119
Figure 8. Power-Supply Connections
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| MAX11190ETE+ | 制造商:Maxim Integrated Products 功能描述:DUAL, 2.2V TO 3.6V, 12-BIT, 3MSPS SAR ADC IN TINY TQFN PACKA - Rail/Tube |
| MAX11190ETE+T | 制造商:Maxim Integrated Products 功能描述:DUAL, 2.2V TO 3.6V, 12-BIT, 3MSPS SAR ADC IN TINY TQFN PACKA - Tape and Reel |
| MAX1119EKA | 制造商:Maxim Integrated Products 功能描述:8 PIN COUNT SOT PACKAGE TYPE - Cut Tape Product |
| MAX1119EKA+ | 制造商:Maxim Integrated Products 功能描述:ADC SGL SAR 100KSPS 8BIT SERL 8PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC 8BIT ADC SERIAL 2CH 8SOT |
| MAX1119EKA+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2Ch Single-Supply Low Pwr Serial 8-Bit 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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