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參數資料
| 型號： | AD7805BRS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 1.5 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數： | 25/28頁 |
| 文件大?。?/td> | 300K |
| 代理商： | AD7805BRS |
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AD7804/AD7805/AD7808/AD7809
–25–
REV. A
Dual External Reference Input Capability
It is possible to operate the AD7804/AD7805/AD7808/AD7809
with two externally applied references. Figure 45 shows the
connections for the AD7804. Reference one, the AD589, is
connected to the REFIN pin of the part; the second reference,
the AD780, is used to overdrive the internal VDD/2 reference
which is provided at the COMP pin of the device. With the
circuit shown in Figure 45 it is possible to configure two of the
channels for operation with the AD780 2.5 V reference and the
other two with the AD589 1.23 V reference. The channel con-
trol register allows the user to select the reference for the indi-
vidual channels.
DV
DD
0.01
m
F
0.1
m
F
10
m
F
AD589
+5V
0.1
m
F
AD780
V
IN
GND
V
O
6.8k
V
SERIAL
INTERFACE
AD7804
AV
DD
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
AGND
DGND
LDAC
CLR
COMP
FSIN
SDIN
CLKIN
DV
DD
REFOUT
REFIN
Figure 45. Two Externally Applied References
+5V
0.01
m
F
AD7805
AV
DD
DV
DD
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
AGND
DGND
LDAC
CLR
COMP
MODE
CS
WR
D9
D0
DV
DD
0.1
m
F
10
m
F
0.01
m
F
IN
1
V
C
1
IN
2
V
C
2
IN
3
V
C
3
IN
4
V
C
4
SSM2164
–V
+15V
–15V
V
IN
3
V
IN
4
500
V
560pF
30k
V
30k
V
500
V
560pF
V
IN
2
V
IN
1
+V
100pF
30k
V
+15V
–15V
V
OUT
A
1/2
OP275
500
V
560pF
500
V
560pF
30k
V
30k
V
100pF
30k
V
+15V
–15V
V
OUT
B
1/2
OP275
Figure 44. Low Cost, Two-Channel Mixer
Low Cost, Two-Channel Mixer Using AD7805, SSM2164 and
OP275
The SSM2164 is a quad voltage controlled amplifier (VCA)
with 120 dB of gain control range. Each VCA in the package is
a current in, current out device with a –33 mV/dB voltage con-
trol input port. Figure 44 shows a basic application circuit
which can be used to implement a low cost stereo, two channel
mixer. A 30 k
resistor converts the input voltage to an input
current for the VCA. The 500
resistor and 560 pF capacitor
on the input are added to ensure stable operation of the
SSM2164. The I
OUT
pin of the SSM2164 should be maintained
at virtual ground and thus the OP275 is operated in its inverting
mode. Its wide bandwidth, high slew rate and low power make it
ideal for a current to voltage converter. A 30 k
feedback resis-
tor is chosen to match the input resistor and thus give unity gain
for a zero volt control voltage input. The 100 pF capacitors
reduce high frequency noise and can be increased to reduce the
low pass cutoff frequency for further noise reduction. The
AD7805 in the circuit is used to control the attenuation of the
VCA, this application circuit only gives attenuation. The voltage
output from the AD7805 provides a low impedance drive to the
SSM2164 so attenuation can be controlled accurately. With a
5 V V
DD
and a V
BIAS
of V
DD
/2 the AD7805 has an LSB size of
approximately 4.5 mV. Therefore, the attenuation can be con-
trolled with a resolution of 0.136 dB/bit and thus 750 codes are
required to provide the full 100 dB of attenuation.
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| AD7805CR | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
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| AD7808BR | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
| AD7808BST | High Efficiency Step-Down and Inverting DC/DC Converter; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7805BRS-REEL | 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 28-Pin SSOP T/R 制造商:Analog Devices 功能描述:DAC 4-CH 10-BIT 28SSOP - Tape and Reel |
| AD7805BRS-REEL7 | 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 28-Pin SSOP T/R |
| AD7805BRSZ | 功能描述:IC DAC 10BIT QUAD PARALL 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:1 系列:- 設置時間:4.5µs 位數:12 數據接口:串行，SPI? 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7805BRSZ-REEL | 功能描述:IC DAC 10BIT QUAD PARALL 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:47 系列:- 設置時間:2µs 位數:14 數據接口:并聯 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
| AD7805BRSZ-REEL7 | 功能描述:IC DAC 10BIT QUAD PARALL 28SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:47 系列:- 設置時間:2µs 位數:14 數據接口:并聯 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
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