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參數(shù)資料
| 型號： | AD9235BRU-20 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 20/40/65 MSPS 3 V A/D Converter |
| 中文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | MO-153-AE, TSSOP-28 |
| 文件頁數(shù)： | 16/32頁 |
| 文件大小： | 1181K |
| 代理商： | AD9235BRU-20 |
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REV. B
AD9235
–16–
reference amplifier switch is connected to the internal resistor
divider (see Figure 12), setting VREF to 1 V. Connecting the
SENSE pin to VREF switches the reference amplifier output to
the SENSE pin, completing the loop and providing a 0.5 V
reference output. If a resistor divider is connected as shown in
Figure 13, the switch will again be set to the SENSE pin. This
will put the reference amplifier in a noninverting mode with the
VREF output defined as follows.
VREF
R
R
=
×
+
(
)
0 5
.
1
2
1
SENSE
ADC
CORE
SELECT
LOGIC
AD9235
VREF
VIN–
VIN+
REFB
REFT
0.1 F
10 F
0.1 F
10 F
0.1 F
0.1 F
0.5V
Figure 12. Internal Reference Configuration
In all reference configurations, REFT and REFB drive the A/D
conversion core and establish its input span. The input range of
the ADC always equals twice the voltage at the reference pin for
either an internal or an external reference.
SENSE
ADC
CORE
SELECT
LOGIC
AD9235
VREF
VIN–
VIN+
REFB
REFT
0.1 F
10 F
0.1 F
10 F
0.1 F
0.1 F
0.5V
R2
R1
Figure 13. Programmable Reference Configuration
External Reference Operation
The use of an external reference may be necessary to enhance the
gain accuracy of the ADC or improve thermal drift characteristics.
When multiple ADCs track one another, a single reference
(internal or external) may be necessary to reduce gain matching
errors to an acceptable level. A high precision external reference
may also be selected to provide lower gain and offset temperature
drift. Figure 14 shows the typical drift characteristics of the
internal reference in both 1 V and 0.5 V modes.
TEMPERATURE ( C)
V
1.2
–40 –30 –20 –10
0
10
20
30
40
50
60
70
80
1.0
0.8
0.6
0.4
0.0
0.2
VREF = 1.0V
VREF = 0.5V
Figure 14. Typical VREF Drift
When the SENSE pin is tied to AVDD, the internal reference
will be disabled, allowing the use of an external reference. An
internal reference buffer will load the external reference with an
equivalent 7 k
load. The internal buffer will still generate the
positive and negative full-scale references, REFT and REFB, for
the ADC core. The input span will always be twice the value of
the reference voltage; therefore, the external reference must be
limited to a maximum of 1 V.
If the internal reference of the AD9235 is used to drive multiple
converters to improve gain matching, the loading of the reference
by the other converters must be considered. Figure 15 depicts
how the internal reference voltage is affected by loading.
LOAD (mA)
E
0.05
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.00
–0.25
–0.20
–0.15
–0.10
–0.05
0.5V ERROR (%)
1V ERROR (%)
Figure 15. VREF Accuracy vs. Load
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| AD9235BRU-20Z | 制造商:Analog Devices 功能描述:ADC 3V 12BIT 20MSPS 0.8LSB 制造商:Analog Devices 功能描述:ADC, 3V, 12BIT, 20MSPS, 0.8LSB, 28TSSOP; Resolution (Bits):12bit; Sampling Rate:20MSPS; Supply Voltage Type:Single; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; Supply Current:30mA; Digital IC Case Style:TSSOP; No. of Pins:28; ;RoHS Compliant: Yes |
| AD9235BRU-40 | 功能描述:IC ADC 12BIT 40MSPS 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD9235BRU-65 | 功能描述:IC ADC 12BIT 65MSPS 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD9235BRURL7-20 | 功能描述:IC ADC 12BIT SGL 20MSPS 28TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD9235BRURL7-40 | 功能描述:IC ADC 12BIT SGL 40MSPS 28TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
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