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參數(shù)資料
| 型號(hào)： | MAX1107EUB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8BIT LP 10-UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 25k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 580µW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個(gè)單端，單極；1 個(gè)偽差分，單極 |
MAX1106/MAX1107
Single-Supply, Low-Power,
Serial 8-Bit ADCs
10
______________________________________________________________________________________
_______________Detailed Description
The MAX1106/MAX1107 analog-to-digital converters
(ADCs) use a successive-approximation conversion
technique and input track/hold (T/H) circuitry to convert
an analog signal to an 8-bit digital output. A simple ser-
ial interface provides easy interface to microprocessors
(Ps). No external hold capacitors are required. All of
the MAX1106/MAX1107 operating modes are pin con-
figurable: internal or external reference, single-ended
or pseudo-differential unipolar conversion, and power
down. Figure 3 shows the typical operating circuit.
Analog Inputs
Track/Hold
The input architecture of the ADCs is illustrated in
Figure 4’s equivalent-input circuit of and is composed
of the T/H, the input multiplexer, the input comparator,
the switched capacitor DAC, and the auto-zero rail.
The device is in acquisition mode most of the time.
During the acquisition interval, the positive input (IN+)
is tracked and is connected to the holding capacitor
(CHOLD). The acquisition interval ends with the falling
edge of CONVST. At this point the T/H switch opens
and CHOLD is connected to the negative input (IN-),
retaining charge on CHOLD as a sample of the signal at
IN+. Once conversion is complete the T/H returns
immediately to its tracking mode.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens, and more time must be
allowed between conversions. The acquisition time,
tACQ, is the minimum time needed for the signal to be
acquired. It is calculated by:
tACQ = 6(RS + RIN)18pF
VDD
3k
CLOAD
GND
DOUT
CLOAD
GND
3k
DOUT
a) VOL to VOH
b) High-Z to VOL and VOH to VOL
Figure 1. Load Circuits for Enable Time
VDD
3k
CLOAD
GND
DOUT
CLOAD
GND
3k
DOUT
a) VOH to High-Z
b) VOL to High-Z
Figure 2. Load Circuits for Disable Time
VDD
I/O
SCK (SK)
MISO (SI)
GND
DOUT
SCLK
CONVST
GND
SHDN
VDD
IN-
1
F
0.1
F
1
F
ON
OFF
IN+
ANALOG
INPUTS
MAX1106
MAX1107
CPU
VDD
REFOUT
REFIN
Figure 3. Typical Operating Circuit
IN-
IN+
REFIN
GND
CHOLD
CAPACITIVE DAC
COMPARATOR
18pF
RIN
6.5k
AUTOZERO
RAIL
TRACK
HOLD
Figure 4. Equivalent Input Circuit
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