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參數(shù)資料
| 型號(hào)： | AD7801BRZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 8BIT PARALLEL INP 20-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 設(shè)置時(shí)間： | 1.2µs |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 12.9mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | 833k |
| 產(chǎn)品目錄頁(yè)面： | 785 (CN2011-ZH PDF) |
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AD7801
–12–
REV. 0
AD7801 as a Digitally Programmable Indicator
A digitally programmable upper limit detector using the DAC is
shown in Figure 34. The upper limit for the test is loaded to the
DAC, which in turn sets the limit for the CMP04. If a signal at
the VIN input is not below the programmed value, an LED will
indicate the Fail condition.
1/4
CMP-04
AD7801
VDD
REFIN
DGND
AGND
D7
D0
VOUT
VIN
PASS/
1/6
74HC05
1k
PASS
1k
FAIL
10 F
0.1 F
+5V
DVDD
Figure 34. Digitally Programmable Indicator
Programmable Current Source
Figure 35 shows the AD7801 used as the control element of a
programmable current source. In this circuit the full-scale
current is set to 1 mA. The output voltage from the DAC is
applied across the current setting resistor of 4.7 k
in series with
the full-scale setting resistor of 470
. Suitable transistors to
place in the feedback loop of the amplifier include the BC107
and the 2N3904, which enable the current source to operate
from a minimum VSOURCE of 6 V. The operating range is
determined by the operating characteristics of the transistor.
Suitable amplifiers include the AD820 and the OP295, both of
which have rail-to-rail operation on their outputs. The current
for any digital input code can be calculated as follows:
I
=
2 V REF D
()
256 (5 k
)
()
AD7801
VOUT
REF IN
VDD = 5V
VDD
AGND DGND
10F
0.1F
EXT REF V
OUT
VIN
GND
AD780/ REF192
WITH VDD = 5V
4.7k
470
+5V
AD820/
OP295
2N3904/
BC107
VSOURCE
LOAD
Figure 35. Programmable Current Source
Coarse and Fine Adjustment using two AD7801s
The two DACs can be paired together to form a coarse and fine
adjustment function for a setpoint as shown in Figure 36. In this
circuit, the first DAC is used to provide the coarse adjustment
and the second DAC is used to provide the fine adjustment.
Varying the ratio of R1 and R2 will vary the relative effect of the
coarse and fine tune elements in the circuit. For the resistor
values shown, the second DAC has a resolution of 148
V
giving a fine tune range of 38 mV (approximately 2 LSB) for
operation with a VDD of 5 V and a reference of 2.5 V. The
amplifier shown allows a rail-to-rail output voltage to be
achieved on the output. A typical application for the circuit
would be in a setpoint controller.
AD7801
VOUT
REF IN
VDD = 5V
VDD
AGND DGND
10F
0.1F
EXT REF V
OUT
VIN
GND
AD780/ REF192
WITH VDD = 5V
OR
AD589 WITH VDD = 3V
+5V
AD820/
OP295
R1
390
AD7801
VOUT
REF IN
VDD
AGND DGND
R2
51.2k
VO
R3
51.2k
R4
390
0.1F
Figure 36. Coarse and Fine Adjustment
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