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參數(shù)資料
| 型號： | X79002 |
| 廠商： | Intersil Corporation |
| 英文描述： | NV DAC with Selectable Output Range and Memory |
| 中文描述： | 內(nèi)華達州DAC，具有可選的輸出范圍和記憶 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 270K |
| 代理商： | X79002 |
16
FN8147.0
March 17, 2005
APPLICATIONS INFORMATION
Remote sensing
The output opamp included in the X79000 and X79001 is
normally configured with a gain of +1, and since the
inverting terminal is available externally, can be used for
remote load sensing (see Figure 3). This configuration is
useful for high accuracy applications which may draw
significant current from the DAC output with a finite
impedance from the DAC to the load. The inverting
terminal must be brought as close as possible to the
load, and there must be very low differential in the
ground potentials of the two circuits.
Output Voltages Greater than 3.025V
The opamp output (Vbuf) can drive up to ±1mA and stay
within 150mV of ground and the V
CC
supply. Normally, if
the opamp is configured with a gain of +1, Vbuf is limited
to 3.10V max, which is the limit of the DAC Vout. If gain
is added to the opamp feedback loop, then Vbuf can
provide a higher output voltage, up to 4.85V with
V
CC
= 5.00V. Figure 4 shows a circuit with a gain of +2
that is configured for 4.84V max Vbuf, with VH internally
set to 2.42V (VH2, VH1, VH0 set to 1,0,0). Care must be
taken when increasing the maximum Vbuf output,
however, in this example V
CC
may have a range of ±5%,
or 4.75V to 5.25V. The maximum Vbuf can be expected
to reach and stay within specifications is 4.75V -
150mV = 4.600V. If the output offset of the DAC is
included (22mV x 2, worst case), then the max output will
be 4.84V + 0.044V = 4.884V. The designer has the
option of either realizing that the DAC may miss the
higher codes, or change the amplifier gain to a value less
than 2 (or 4.60/2.42 = 1.90, for this example) to keep all
codes and reduce the maximum Vbuf output.
Using the VH and VL pins for multiplying functions
When a time-varying waveform is applied at either
reference input pin, the output reflects a scaled version of
that waveform (see Figure 5). This waveform will follow
the DAC output voltage equation when applied to VH:
Vbuf = [(VH - VL)(n/4095)] + VL, n = 0 to 4095
(excluding DAC, Reference scaling and opamp errors)
This shows that the input range for the waveform is
limited to VL on the low side, and by the Vout range
(3.10V) on the high side. The output is scaled by the
DAC setting to allow for gain control. The maximum
output voltage can be increased as shown in Figure 4
using the opamp and Vbuf output. It is advisable that the
VH pin be driven by a low impedance source for optimal
AC performance. The minimum bandwidth of the circuit
is 50kHz over all specified voltage range, temperature
and output loading configurations.
Note that it is possible to use the VL pin in the same
fashion, with VH fixed, but the resulting waveform will
have a slightly different transfer function:
Vbuf = VH - (VH
- VL)[(4095-n)/4095], n = 0 to 4095
Alternatively, the VL input could include a variable
reference, such as a temperature sensor, or a shunt
reference connected between VH and VL, which would
fix their differential (the configuration register must be
set for external VH and VL references). This provides a
DAC output which varies proportional to temperature,
yet can be set to an arbitrary voltage by the DAC for
biasing applications.
X79000, X79001, X79002
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X79000 | NV DAC with Selectable Output Range and Memory |
| X79000V20I | NV DAC with Selectable Output Range and Memory |
| X79001 | NV DAC with Selectable Output Range and Memory |
| X79001V20I | NV DAC with Selectable Output Range and Memory |
| X79002V20I | NV DAC with Selectable Output Range and Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X79002V20I | 功能描述:IC DAC NV SELECT OUT/MEM 20TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| X79002V20IT1 | 功能描述:IC DAC NV SELECT OUT/MEM 20TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| X790A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium current, high performance, low voltage PNP transistor |
| X7984-125S-M | 制造商:CPI 制造商全稱:CPI 功能描述:SOLID STATE HIGH POWER AMPLIFIER MODULES |
| X7984-225S-M | 制造商:CPI 制造商全稱:CPI 功能描述:SOLID STATE HIGH POWER AMPLIFIER MODULES |
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