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| 型号： | AD7495AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SRL LP W/REF 8-SOIC |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 10.5mW |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极 |
AD7475/AD7495
Rev. B | Page 13 of 24
THEORY OF OPERATION
The AD7475/AD7495 are fast, micropower, 12-bit, single-
supply analog-to-digital converters (ADCs). The parts can be
operated from a 2.7 V to 5.25 V supply. When operated from
either a 5 V supply or a 3 V supply, the AD7475/AD7495 are
capable of throughput rates of 1 MSPS when provided with a
20 MHz clock.
The AD7475/AD7495 ADCs have an on-chip track-and-hold
with a serial interface housed in either an 8-lead SOIC_N or
MINI_SO package, features that offer the user considerable
space-saving advantages over alternative solutions. The AD7495
also has an on-chip 2.5 V reference. The serial clock input
accesses data from the part but also provides the clock source
for the successive-approximation ADC. The analog input range
is 0 V to REF IN for the AD7475 and 0 V to REF OUT for the
AD7495.
The AD7475/AD7495 also feature power-down options to allow
power saving between conversions. The power-down feature is
implemented across the standard serial interface, as described
in the Operating Modes section.
CONVERTER OPERATION
The AD7475/AD7495 are 12-bit, successive approximation
analog-to-digital converters based around a capacitive DAC.
The AD7475/AD7495 can convert analog input signals in the
schematics of the ADC. The ADC comprises control logic, SAR,
and a capacitive DAC, which are used to add and subtract fixed
amounts of charge from the sampling capacitor to bring the
comparator back into a balanced condition. Figure 10 shows the
ADC during its acquisition phase. SW2 is closed and SW1 is in
Position A. The comparator is held in a balanced condition and
the sampling capacitor acquires the signal on VIN.
COMPARATOR
VIN
CONTROL LOGIC
CAPACITIVE
DAC
AGND
4k
Ω
SW2
SW1
A
B
01684-B-010
Figure 10. ADC Acquisition Phase
When the ADC starts a conversion (see Figure 11), SW2 opens
and SW1 moves to Position B causing the comparator to
become unbalanced. The control logic and the capacitive DAC
are used to add and subtract fixed amounts of charge from the
sampling capacitor to bring the comparator back into a
balanced condition. When the comparator is rebalanced, the
conversion is complete. The control logic generates the ADC
output code.
COMPARATOR
VIN
CONTROL LOGIC
CAPACITIVE
DAC
AGND
4k
Ω
SW2
SW1
A
B
01684-B
-011
Figure 11. ADC Conversion Phase
ADC TRANSFER FUNCTION
The output coding of the AD7475/AD7495 is straight binary.
The designed code transitions occur midway between
successive LSB integer values (that is, LSB, 3/2 LSBs, etc.). The
LSB size is = VREF/4096. The ideal transfer characteristic for the
AD7475/AD7495 is shown in Figure 12.
111...111
111...110
111...000
011...111
000...010
000...001
000...000
ADC
CODE
0V 0.5LSB
VREF –1.5LSB
ANALOG INPUT
1LSB = VREF/4096
01684-B
-012
Figure 12. AD7475/AD7495 Transfer Characteristic
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| AD7495ARM | 功能描述:IC ADC 12BIT SRL LP W/REF 8MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7495ARM-REEL | 功能描述:IC ADC 12BIT SRL LP W/REF 8MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7495ARM-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 12-bit Serial 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 1MSPS 12-BIT SERL 8MSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:FAST 12-BIT LOW-POWER SERIAL ADC I.C. - Tape and Reel |
| AD7495ARMZ | 功能描述:IC ADC 12BIT SRL LP W/REF 8MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7495ARMZ3 | 制造商:AD 制造商全称:Analog Devices 功能描述:1MSPS,12-Bit ADCs |
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