- 您现在的位置：买卖IC网 > PDF目录22159 > AD7741BRZ-REEL (Analog Devices Inc)IC CONVERTER VOLT TO FREQ 8SOIC PDF资料下载
参数资料
| 型号： | AD7741BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER VOLT TO FREQ 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 电压至频率 |
| 频率 - 最大： | 3.072MHz |
| 全量程： | ±50ppm/°C |
| 线性： | ±0.012% |
| 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-SO |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD7741/42EBZ-ND - BOARD EVAL FOR AD7741/7742 |
AD7741/AD7742
Table II. AD7741/AD7742 Input Range Selection
UNI/ BIP
N/A
0
0
1
1
GAIN
N/A
0
1
0
1
Gain, G
X1
X1
X2
X1
X2
V IN (Min)
f OUT = 0.05 f CLKIN
0
–V REF
–V REF /2
0
0
V IN (Max)
f OUT = 0.45 f CLKIN
+V REF
+V REF
+V REF /2
+V REF
+V REF /2
Part
AD7741
AD7742
AD7742
AD7742
AD7742
As can be seen from Table II, the AD7741 has one input range
configuration whereas the AD7742 has unipolar/bipolar as
well as gain options depending on the status of the GAIN
and UNI/ BIP pins.
The transfer function for the AD7741 is shown in Figure 3.
Figure 4 shows the AD7742 transfer function for unipolar input
range configuration while the AD7742 transfer function for
bipolar input range configuration is shown in Figure 5.
OUTPUT
FREQUENCY
f OUT
OUTPUT
FREQUENCY
f OUT
f OUT MAX
(0.45 f CLKIN )
f OUT MIN
(0.05 f CLKIN )
f OUT MAX
–
V REF
GAIN
+
V REF
GAIN
DIFFERENTIAL
INPUT VOLTAGE
(0.45 f CLKIN )
Figure 5. AD7742 Transfer Characteristic for Bipolar
Differential Input Range: –V REF /Gain to +V REF /Gain; the
common-mode range must be between +0.5 V and
V DD – 1.75 V. UNI/ BIP pin tied to GND.
f OUT MIN
(0.05 f CLKIN )
0
REFIN
INPUT
VOLTAGE V IN
VFC Modulator
The analog input signal to the AD7741/AD7742 is continu-
ously sampled by a switched capacitor modulator whose sam-
pling rate is set by a master clock input that may be supplied
Figure 3. AD7741 Transfer Characteristic for Input Range
from 0 to V REF
OUTPUT
FREQUENCY
f OUT
f OUT MAX
(0.45 f CLKIN )
f OUT MIN
(0.05 f CLKIN )
externally or by a crystal-controlled on-chip clock oscillator.
However, the input signal is buffered on-chip before being ap-
plied to the sampling capacitor of the modulator. This isolates
the sampling capacitor charging currents from the analog input
pins.
This system is a negative feedback loop that tries to keep the net
charge on the integrator capacitor at zero, by balancing charge
injected by the input voltage with charge injected by the V REF .
The output of the comparator provides the digital input for the
1-bit DAC, so that the system functions as a negative feedback
loop that tries to minimize the difference signal (see Figure 6).
CLK
INTEGRATOR
COMPARATOR
0
+
V REF
GAIN
DIFFERENTIAL
INPUT VOLTAGE
INPUT
+
–
+
1-BIT
STREAM
Figure 4. AD7742 Transfer Characteristic for Unipolar
Differential Input Range: 0 V to V REF /Gain; the input
common-mode range must be between +0.5 V and
V DD – 1.75 V. UNI/ BIP pin tied to V DD .
–8 –
–
+V REF
–V REF
Figure 6. AD7741/AD7742 Modulator Loop
REV. 0
相关PDF资料 |
PDF描述 |
|---|---|
| R0.25D12-1209/H | CONV DC/DC 0.25W 12VIN +/-9V OUT |
| R0.25D12-1205/P | CONV DC/DC 0.25W 12VIN +/-5V OUT |
| EN93L3X2 | BATTERY PK 9.0V C SIZE ALKALINE |
| AD7740KRM | IC CONVERTER V TO FREQ 8-MSOP |
| R0.25D12-1205/H | CONV DC/DC 0.25W 12VIN +/-5V OUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7741BRZ-REEL7 | 功能描述:IC CONVERTER VOLT TO FREQ 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - V/F 和 F/V 转换器 系列:- 标准包装:1 系列:- 类型:频率至电压 频率 - 最大:10kHz 全量程:- 线性:±0.3% 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:Digi-Reel® 其它名称:LM2917MX-8/NOPBDKR |
| AD7741YR | 制造商:Analog Devices 功能描述:VFC Sync 1.35MHz 8-Pin SOIC N |
| AD7741YR-REEL | 功能描述:IC CONVERTER V TO FREQ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - V/F 和 F/V 转换器 系列:- 标准包装:1 系列:- 类型:频率至电压 频率 - 最大:10kHz 全量程:- 线性:±0.3% 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:Digi-Reel® 其它名称:LM2917MX-8/NOPBDKR |
| AD7741YR-REEL7 | 功能描述:IC CONVERTER V TO FREQ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - V/F 和 F/V 转换器 系列:- 标准包装:1 系列:- 类型:频率至电压 频率 - 最大:10kHz 全量程:- 线性:±0.3% 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:Digi-Reel® 其它名称:LM2917MX-8/NOPBDKR |
| AD7741YRZ | 功能描述:IC CONVERTER VOLT TO FREQ 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - V/F 和 F/V 转换器 系列:- 标准包装:1 系列:- 类型:频率至电压 频率 - 最大:10kHz 全量程:- 线性:±0.3% 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:Digi-Reel® 其它名称:LM2917MX-8/NOPBDKR |
发布紧急采购，3分钟左右您将得到回复。