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参数资料
型号： AD9226ARSZ
厂商： Analog Devices Inc
文件页数： 10/28页
文件大小： 0K
描述： IC ADC 12BIT 65MSPS 28-SSOP
产品培训模块： ADC Applications
ADC Architectures
ADC DC/AC Performance
标准包装： 1
位数： 12
采样率（每秒）： 65M
数据接口： 并联
转换器数目： 3
功率耗散（最大）： 475mW
电压电源： 单电源
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 28-SSOP（0.209"，5.30mm 宽）
供应商设备封装： 28-SSOP
包装： 管件
输入数目和类型： 2 个单端，单极；1 个差分，单极
REV. B
AD9226
–18–
A2
LOGIC
A1
DISABLE
A1
1V
TO
A/D
AD9226
CAPT
CAPB
VREF
SENSE
REFCOM
2.5V
Figure 11a. Equivalent Reference Circuit
0.1 F
10 F
0.1 F
CAPT
CAPB
AD9226
VREF
0.1 F
10 F
Figure 11b. CAPT and CAPB DC-Coupling
The actual reference voltages used by the internal circuitry of the
AD9226 appear on the CAPT and CAPB pins. The voltages
on these pins are symmetrical about the analog supply. For
proper operation when using an internal or external reference, it
is necessary to add a capacitor network to decouple these pins.
Figure 11b shows the recommended decoupling network. The
turn-on time of the reference voltage appearing between CAPT
and CAPB is approximately 10 ms and should be evaluated in
any power-down mode of operation.
USING THE INTERNAL REFERENCE
The AD9226 can be easily configured for either a 1 V p-p input
span or 2 V p-p input span by setting the internal reference.
Other input spans can be realized with two external gain-
setting resistors as shown in Figure 12 of this data sheet, or
using an external reference.
Pin Programmable Reference
By shorting the VREF pin directly to the SENSE pin, the inter-
nal reference amplifier is placed in a unity-gain mode and the
resultant VREF output is 1 V. By shorting the SENSE pin
directly to the REFCOM pin, the internal reference amplifier is
configured for a gain of 2.0 and the resultant VREF output is
2.0 V. The VREF pin should be bypassed to the REFCOM pin
with a 10
F tantalum capacitor in parallel with a low-inductance
0.1
F ceramic capacitor as shown in Figure 11b.
Resistor Programmable Reference
Figure 12 shows an example of how to generate a reference
voltage other than 1.0 V or 2.0 V with the addition of two exter-
nal resistors. Use the equation,
VREF = 1 V
× (1 + R1/R2)
to determine appropriate values for R1 and R2. These resistors
should be in the 2 k
to 10 k range. For the example shown,
R1 equals 2.5 k
and R2 equals 5 k. From the equation above,
the resultant reference voltage on the VREF pin is 1.5 V. This
sets the input span to be 1.5 V p-p. The midscale voltage can
also be set to VREF by connecting VINB to VREF. Alterna-
tively, the midscale voltage can be set to 2.5 V by connecting
VINB to a low-impedance 2.5 V source as shown in Figure 12.
VINA
VREF
AD9226
VINB
1.75V
SENSE
REFCOM
0.1 F
10 F
0.1 F
15pF
3.25V
33
1.5V
0.1 F
CAPT
2.5V
10 F
R1
2.5k
R2
5k
CAPB
Figure 12. Resistor Programmable Reference (1.5 V p-p
Input Span, Differential Input VCM = 2.5 V)
USING AN EXTERNAL REFERENCE
The AD9226 contains an internal reference buffer, A2 (see
Figure 11b), that simplifies the drive requirements of an external
reference. The external reference must be able to drive about
5k
(±20%) load. Note that the bandwidth of the reference
buffer is deliberately left small to minimize the reference noise
contribution. As a result, it is not possible to rapidly change the
reference voltage in this mode.
Figure 13 shows an example of an external reference driving
both VINB and VREF. In this case, both the common-mode
voltage and input span are directly dependent on the value of
VREF. Both the input span and the center of the input span are
equal to the external VREF. Thus the valid input range extends
from (VREF + VREF/2) to (VREF – VREF/2). For example,
if the REF191, a 2.048 V external reference, is selected, the
input span extends to 2.048 V. In this case, 1 LSB of the AD9226
corresponds to 0.5 mV. It is essential that a minimum of a 10
F
capacitor, in parallel with a 0.1
F low-inductance ceramic
capacitor, decouple the reference output to ground.
To use an external reference, the SENSE pin must be connected
to AVDD. This connection will disable the internal reference.
VINA
VREF
AD9226
VINB
SENSE
0.1 F
10 F
0.1 F
15pF
VINA+VREF/2
33
0.1 F
CAPT
CAPB
VINB–VREF/2
10 F
VREF
0.1 F
5V
Figure 13. Using an External Reference
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AD9226ARSZRL 功能描述:IC ADC 12BIT 65MSPS 28SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极
AD9226AST 功能描述:IC ADC 12BIT 65MSPS 48-LQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:-
AD9226ASTRL 功能描述:IC ADC 12BIT 65MSPS 48-LQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:-
AD9226ASTZ 功能描述:IC ADC 12BIT 65MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6
AD9226ASTZRL 功能描述:IC ADC 12BIT 65MSPS 48LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极
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