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參數資料
| 型號： | AD7801 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +2.7 V to +5.5 V, Parallel Input, Voltage Output 8-Bit DAC |
| 中文描述： | 2.7 V至5.5 V，電壓并行輸入輸出8位DAC |
| 文件頁數： | 9/16頁 |
| 文件大小： | 219K |
| 代理商： | AD7801 |
AD7801
–9–
REV. 0
V
OUT
=
2
×
V
REF
N
256
where:
N
is the decimal equivalent of the binary input
code. N ranges from 0 to 255.
V
REF
is the voltage applied to the external REFIN pin
when the external reference is selected and is V
DD
/2
if the internal reference is used.
T able I. Output Voltage for Selected Input Codes
Digital
MSB . . . LSB
Analog Output
1111 1111
2
×
254
256
×
V
REF
V
2
×
255
256
×
V
REF
V
1111 1110
2
×
129
256
×
V
REF
V
V
REF
V
2
×
127
256
×
V
REF
V
1000 0001
1000 0000
0111 1111
0000 0001
0
V
2
×
V
REF
256
V
0000 0000
2V
REF
V
REF
0
D
DAC INPUT CODE
00 01
7F 80 81
FE FF
Figure 26. DAC Transfer Function
POWE R-ON RE SE T
T he AD7801 has a power-on reset circuit designed to allow
output stability during power up. T his circuit holds the DAC in
a reset state until a write takes place to the DAC. In the reset
state all zeros are latched into the input register of the DAC and
the DAC register is in transparent mode thus the output of the
DAC is held at ground potential until a write takes place to the
DAC. T he power-on reset circuitry generates a PON ST RB
signal which is a gating signal used within the logic to identify
a power-on condition.
POWE R-DOWN FE AT URE S
T he AD7801 has a power-down feature implemented by
exercising the external
PD
pin. An active low signal puts the
complete DAC into power-down mode. When in power-down,
the current consumption of the device is reduced to less than
1
μ
A max at +25
°
C or 2
μ
A max over temperature, making the
device suitable for use in portable battery powered equipment.
T he internal reference resistors, the reference bias servo loop,
the output amplifier and associated linear circuitry are all shut
down when the power-down is activated. T he output terminal
sees a load of
≈
23 k
to GND when in power-down mode as
shown in Figure 25. T he contents of the data register are
unaffected when in power-down mode. T he device typically
comes out of power-down in 13
μ
s (see Figure 10).
V
DD
11.7k
11.7k
I
DAC
V
REF
Figure 25. Output Stage During Power-Down
Analog Outputs
T he AD7801 contains a voltage output DAC with 8-bit resolution
and rail-to-rail operation. T he output buffer provides a gain of
two at the output. Figures 2, 3 and 4 show the source and sink
capabilities of the output amplifier. T he slew rate of the output
amplifier is typically 7.5 V/
μ
s and has a full-scale settling to
eight bits with a 100 pF capacitive load in typically 1.2
μ
s.
T he input coding to the DAC is straight binary. T able I shows
the binary transfer function for the AD7801. Figure 26 shows
the DAC transfer function for binary coding. Any DAC output
voltage can be expressed as:
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| AD7801BR | 功能描述:IC DAC 8BIT 2.7V 20-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色產品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 標準包裝:91 系列:- 設置時間:4µs 位數:10 數據接口:MICROWIRE?，串行，SPI? 轉換器數目:8 電壓電源:單電源 功率耗散（最大）:2.7mW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-DFN-EP（4x3） 包裝:管件 輸出數目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD7801BR-REEL | 制造商:Analog Devices 功能描述:DAC 1-CH Current Steering 8-bit 20-Pin SOIC W T/R |
| AD7801BR-REEL7 | 制造商:Analog Devices 功能描述:DAC 1-CH Current Steering 8-bit 20-Pin SOIC W T/R 制造商:Analog Devices 功能描述:DAC 1CH CURRENT STEERING 8BIT 20SOIC W - Tape and Reel |
| AD7801BRU | 功能描述:IC DAC 8BIT PARALLEL INP 20TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色產品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 標準包裝:91 系列:- 設置時間:4µs 位數:10 數據接口:MICROWIRE?，串行，SPI? 轉換器數目:8 電壓電源:單電源 功率耗散（最大）:2.7mW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-DFN-EP（4x3） 包裝:管件 輸出數目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD7801BRU-REEL | 制造商:Analog Devices 功能描述:DAC 1-CH Current Steering 8-bit 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DAC 1CH CURRENT STEERING 8BIT 20TSSOP - Tape and Reel |
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