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參數資料
| 型號： | MAXADCLITE# |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 10/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVALUATION FOR MAX11645 |
| 產品培訓模塊： | Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| ADC 的數量： | 1 |
| 位數： | 12 |
| 采樣率（每秒）： | 94.4k |
| 數據接口： | USB |
| 輸入范圍： | ±VREF/2 |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | MAX11645 |
| 已供物品： | 板，軟件 |
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
18
______________________________________________________________________________________
Applications Information
Power-On Reset
The configuration and setup registers (Tables 1 and 2)
default to a single-ended, unipolar, single-channel con-
version on AIN0 using the internal clock with VDD as the
reference. The memory contents are unknown after
power-up.
Automatic Shutdown
Automatic shutdown occurs between conversions when
the MAX11644/MAX11645 are idle. All analog circuits
participate in automatic shutdown except the internal
reference due to its prohibitively long wake-up time.
When operating in external clock mode, a STOP, not-
acknowledge, or repeated START condition must be
issued to place the devices in idle mode and benefit
from automatic shutdown. A STOP condition is not nec-
essary in internal clock mode to benefit from automatic
shutdown because power-down occurs once all con-
version results are written to memory (Figure 10). When
using an external reference or VDD as a reference, all
analog circuitry is inactive in shutdown and supply cur-
rent is less than 0.5μA. The digital conversion results
obtained in internal clock mode are maintained in mem-
ory during shutdown and are available for access
through the serial interface at any time prior to a STOP
or a repeated START condition.
When idle, the MAX11644/MAX11645 continuously wait
for a START condition followed by their slave address
(see the
Slave Address section). Upon reading a valid
address byte, the MAX11644/MAX11645 power up. The
internal reference requires 10ms to wake up, so when
using the internal reference it should be powered up
10ms prior to conversion or powered continuously.
Wake-up is invisible when using an external reference
or VDD as the reference.
Automatic shutdown results in dramatic power savings,
particularly at slow conversion rates and with internal
clock. For example, at a conversion rate of 10ksps, the
average supply current for the MAX11645 is 60μA (typ)
and drops to 6μA (typ) at 1ksps. At 0.1ksps the aver-
age supply current is just 1μA, or a minuscule 3μW of
power consumption. See Average Supply Current vs.
Conversion Rate (External Clock) in the
Typical
Operating Characteristics section).
Reference Voltage
SEL[2:0] of the setup byte (Table 1) control the refer-
ence configuration (Table 6).
Internal Reference
The internal reference is 4.096V for the MAX11644 and
2.048V for the MAX11645. When REF is configured to
be an internal reference output (SEL[2:1] = 11), decou-
ple REF to GND with a 0.1μF capacitor and a 2k
Ω
series resistor (see the
Typical Operating Circuit). Once
powered up, the reference always remains on until
reconfigured. The internal reference requires 10ms to
wake up and is accessed using SEL0 (Table 6). When
in shutdown, the internal reference output is in a high-
impedance state. The reference should not be used to
supply current for external circuitry. The internal refer-
ence does not require an external bypass capacitor
and works best when left unconnected (SEL1 = 0).
External Reference
The external reference can range from 1V to VDD. For
maximum conversion accuracy, the reference must be
able to deliver up to 40μA and have an output imped-
ance of 500k
Ω or less. If the reference has a higher
output impedance or is noisy, bypass it to GND as
close as possible to REF with a 0.1μF capacitor.
SEL2
SEL1
SEL0
REFERENCE
VOLTAGE
REF
INTERNAL REFERENCE
STATE
00X
VDD
Not connected
Always off
0
1
X
External reference
Reference input
Always off
1
0
Internal reference
Not connected*
Always off
1
0
1
Internal reference
Not connected*
Always on
1
0
Internal reference
Reference output
Always off
1
Internal reference
Reference output
Always on
Table 6. Reference Voltage and REF Format
X = Don’t care.
*Preferred configuration for internal reference.
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| MAXADCLITE# | 功能描述:數據轉換 IC 開發(fā)工具 MAX11645 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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| MAXC001 | 制造商:Maxim Integrated Products 功能描述: |
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