參數資料
型號： AD9244BSTRL-65
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 14-Bit, 40/65 MSPS Monolithic A/D Converter
中文描述： 1-CH 14-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP48
封裝： MS-026-BBC, LQFP-48
文件頁數： 19/36頁
文件大?。?/td> 1845K
代理商： AD9244BSTRL-65
REV. A
AD9244
–19–
DIGITAL INPUTS AND OUTPUTS
Digital Outputs
Table III details the relationship among the ADC input, OTR,
and digital output format.
Data Format Select (DFS)
The AD9244 may be programmed for straight binary or twos
complement data on the digital outputs. Connect the DFS pin to
AGND for straight binary and to AVDD for twos complement.
Digital Output Driver Considerations
The AD9244 output drivers can be configured to interface with
5 V or 3.3 V logic families by setting DRVDD to 5 V or 3.3 V,
respectively. The output drivers are sized to provide sufficient
output current to drive a wide variety of logic families. How-
ever, large drive currents tend to cause glitches on the supplies
and may affect converter performance. Applications requiring
the ADC to drive large capacitive loads or large fanouts may
require external buffers or latches.
Out-of-Range (OTR)
An out-of-range condition exists when the analog input voltage is
beyond the input range of the ADC. OTR is a digital output that
is updated along with the data output corresponding to the par-
ticular sampled input voltage. Thus, OTR has the same pipeline
latency as the digital data. OTR is low when the analog input
voltage is within the analog input range and high when the analog
input voltage exceeds the input range as shown in Figure 12.
OTR will remain high until the analog input returns to within the
input range and another conversion is completed. By logically
AND-ing OTR with the MSB and its complement, overrange
high or underrange low conditions can be detected. Table IV is a
truth table for the overrange/underrange range circuit in Figure 13,
which uses NAND gates. Systems requiring programmable gain
conditioning of the AD9244 can, after eight clock cycles, detect an
out-of-range condition, thus eliminating gain selection iterations.
Also, OTR can be used for digital offset and gain calibration.
1
0
0
1111 1111 1111
1111 1111 1111
1111 1111 1110
0
0
1
0000 0000 0001
0000 0000 0000
0000 0000 0000
OTR DATA OUTPUTS
OTR
+FS – 1 LSB
+FS – 1/2 LSB
+FS
–FS
–FS + 1/2 LSB
–FS – 1/2 LSB
Figure 12. OTR Relation to Input Voltage and Output Data
Table IV. Output Data Format
OTR
MSB
Analog Input Is
0
0
1
1
0
1
0
1
Within Range
Within Range
Underrange
Overrange
MSB
OTR
MSB
OVER = 1
UNDER = 1
Figure 13. Overrange/Underrange Logic
Digital Output Enable Function (OEB)
The AD9244 has three-state ability. If the OEB pin is low, the
output data drivers are enabled. If the OEB pin is high, the
output data drivers are placed in a high impedance state. It is
not intended for rapid access to the data bus. Note that OEB is
referenced to the digital supplies (DRVDD) and should not
exceed that supply voltage.
Table III. Output Data Format
Twos
Complement
Mode
Binary
Output Mode
Input (V)
Condition (V)
OTR
VIN+
–
VIN
–
VIN+
–
VIN
–
VIN+
–
VIN
–
VIN+
–
VIN
–
VIN+
–
VIN
–
<
–
VREF
–
0.5 LSB
=
–
VREF
= 0
= +VREF
–
1.0 LSB
> +VREF
–
0.5 LSB
00 0000 0000 0000
00 0000 0000 0000
10 0000 0000 0000
11 1111 1111 1111
11 1111 1111 1111
10 0000 0000 0000
10 0000 0000 0000
00 0000 0000 0000
01 1111 1111 1111
01 1111 1111 1111
1
0
0
0
1
相關PDF資料
PDF描述
AD9244-EVAL 14-Bit, 40/65 MSPS Monolithic A/D Converter
AD9244BST-65 14-Bit, 40/65 MSPS Monolithic A/D Converter
AD9244BST-40 14-Bit, 40/65 MSPS Monolithic A/D Converter
AD9245 14-Bit, 80 MSPS, 3 V A/D Converter
AD9245BCP-80 14-Bit, 80 MSPS, 3 V A/D Converter
相關代理商/技術參數
參數描述
AD9244BSTZ40 制造商:Analog Devices 功能描述:
AD9244BSTZ-40 功能描述:IC ADC 14BIT 40MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
AD9244BSTZ-401 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 40 MSPS/65 MSPS A/D Converter
AD9244BSTZ-65 功能描述:IC ADC 14BIT 65MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
AD9244BSTZ-65 制造商:Analog Devices 功能描述:IC 14BIT ADC SMD 9244 LQFP48 制造商:Analog Devices 功能描述:IC, 14BIT ADC, SMD, 9244, LQFP48
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