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| 型号： | AD7492BR-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT W/REF W/CLK 24-SOIC |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 16.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°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 W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极 |
| 配用： | EVAL-AD7492CBZ-ND - BOARD EVALUATION FOR AD7492 |
AD7492
Rev. A | Page 16 of 24
CONVST
BUSY
CS
RD
DBx
tWAKEUP
tCONVERT
01
12
8-
02
1
Figure 21. Mode 2 Operation
VDRIVE
The VDRIVE pin is used as the voltage supply to the digital output
drivers and the digital input circuitry. It is a separate supply
from AVDD and DVDD. The purpose of using a separate supply
for the digital input/output interface is that the user can vary
the output high voltage, VOH, and the logic input levels, VINH
and VINL, from the VDD supply to the AD7492. For example, if
AVDD and DVDD are using a 5 V supply, the VDRIVE pin can be
powered from a 3 V supply. The ADC has better dynamic
performance at 5 V than at 3 V, so operating the part at 5 V,
while still being able to interface to 3 V parts, pushes the
AD7492 to the top bracket of high performance 12-bit ADCs.
Of course, the ADC can have its VDRIVE and DVDD pins
connected together and be powered from a 3 V or 5 V supply.
The trigger levels are VDRIVE × 0.7 and VDRIVE × 0.3 for the digital
inputs. The pins that are powered from VDRIVE are DB11 to DB0,
CS, RD, CONVST, and BUSY.
PS/FS PIN
As previously mentioned, the PS/FS pin is used to control the
type of power-down mode that the AD7492 can enter into if
operated in Mode 2. This pin can be hardwired either high or
low, or even controlled by another device. It is important to
note that toggling the PS/FS pin while in power-down mode
does not switch the part between partial sleep and full sleep
modes. To switch from one sleep mode to another, the AD7492
has to be powered up and the polarity of the PS/FS pin changed.
It can then be powered down to the required sleep mode.
POWER-UP
It is recommended that the user performs a dummy conversion
after power-up, as the first conversion result could be incorrect.
This also ensures that the part is in the correct mode of
operation. The recommended power-up sequence is as follows:
1. GND
2. VDD
3. VDRIVE
4. Digital Inputs
5. VIN
Power vs. Throughput
The two modes of operation for the AD7492 produces different
power vs. throughput performances, Mode 1 and Mode 2; see
the Operating Modes section of the data sheet for more detailed
descriptions of these modes. Mode 2 is the sleep mode
(partial/full) of the part and it achieves the optimum power
performance.
Mode 1
Figure 22 shows the AD7492 conversion sequence in Mode 1
using a throughput rate of 500 kSPS. At 5 V supply, the current
consumption for the part when converting is 3 mA and the
quiescent current is 1.8 mA. The conversion time of 880 ns
contributes 6.6 mW to the overall power dissipation in the
following way:
(880 ns/2 μs) × (5 × 3 mA) = 6.6 mW
The contribution to the total power dissipated by the remaining
1.12 μs of the cycle is 5.04 mW
(1.12 μs/2 μs) × (5 × 1.8 mA) = 5.04 mW
Thus the power dissipated during each cycle is
6.6 mW + 5.04 mW = 11.64 mW
CONVST
BUSY
880ns
tQUIESCENT
tCONVERT
1.12s
2s
01
12
8-
02
2
Figure 22. Mode 1 Power Dissipation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7492BR-REEL7 | 功能描述:IC ADC 12BIT W/REF W/CLK 24-SOIC 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 |
| AD7492BRU | 功能描述:IC ADC 12BIT W/REF W/CLK 24TSSOP 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:- |
| AD7492BRU-5 | 制造商:Analog Devices 功能描述:ADC Single SAR 1.25Msps 12-bit Parallel 24-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:1.5MSPS 12-BIT ADC, INTERNAL REF + CLOCK - Bulk |
| AD7492BRU-5-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 1.25Msps 12-bit Parallel 24-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 1.25MSPS 12-BIT PARALLEL 24TSSOP - Tape and Reel |
| AD7492BRU-5-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1.25Msps 12-bit Parallel 24-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 1.25MSPS 12-BIT PARALLEL 24TSSOP - Tape and Reel |
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