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參數(shù)資料
| 型號(hào)： | DS4026S+WCN |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC TCXO 25MHZ 16-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 45 |
| 類型： | 溫度 - 補(bǔ)償晶體振蕩器（TCXO） |
| 頻率： | 25MHz |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 電流 - 電源： | 1.5mA |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 安裝類型： | 表面貼裝 |
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DS4026
10MHz to 51.84MHz TCXO
8
_______________________________________________________________________________________
TEMP
SENSOR
VCC
GND
VOSC
GNDOSC
GNDD
VREF
VCCD
FOUT
GNDA
SCL
SDA
I2C
INTERFACE
CONTROLLER
DAC
CMOS
BUFFER
A/D
GND
EEPROM
ARRAY
GND
VCC
DS4026
Figure 2. Functional Diagram
Detailed Description
The DS4026 is a TCXO capable of operating at 3.3V
±5%, and it allows digital tuning of the fundamental fre-
quency. The device is calibrated in the factory to
achieve an accuracy of ±1ppm over the industrial tem-
perature range, and its minimum pullability is ±8ppm
with a typical resolution of 1ppb (typ) per LSB.
The DS4026 contains the following blocks:
Oscillator block with variable capacitor for compen-
sation
Output driver block
Temperature sensor
Controller to read the temperature, control lookup
table, and adjust the DAC input
DAC output to adjust the capacitive load
I2C interface to communicate with the chip
The oscillator block consists of an amplifier and variable
capacitor in a Pierce crystal oscillator with a crystal res-
onator of fundamental mode. The oscillator amplifier is a
single transistor amplifier and its transconductance is
temperature compensated. The variable capacitor is
adjusted by the DAC to provide temperature compensa-
tion. With the FTUNEH and FTUNEL registers, a minimum
pullability of ±8ppm (±5ppm for 10MHz) is achieved with
a typical resolution of 1ppb (typ) per LSB.
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