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参数资料
| 型号： | AD8801 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Octal 8-Bit TrimDAC with Power Shutdown(带电源关断的八路8位微调D/A转换器) |
| 中文描述： | 八进制8位功耗关断TrimDAC（带电源关断的八路8位微调的D / A转换器） |
| 文件页数： | 4/16页 |
| 文件大小： | 223K |
| 代理商： | AD8801 |
REV. A
–4–
AD8801/AD8803
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
DAC REGISTER LOAD
1
0
1
0
1
0
+5V
0V
SDI
CLK
CS
V
OUT
OCTAL 8-BIT TRIMDAC,
WITH SHUTDOWN
Figure 2a. Timing Diagram
A
X
OR D
X
A
X
OR D
X
1
0
1
0
1
0
+5V
0V
SDI
(DATA
IN)
CLK
CS
V
OUT
±
1 LSB
±
1 LSB ERROR BAND
t
S
t
CSW
t
CSH
t
CL
t
CSS
t
CH
t
DS
t
DH
t
CS1
DETAIL SERIAL DATA INPUT TIMING (
RS
= "1")
Figure 2b. Detail Timing Diagram
t
S
t
RS
±
1 LSB
±
1 LSB ERROR BAND
1
0
+5V
2.5V
RS
V
OUT
RESET TIMING
Figure 2c. Reset Timing Diagram
T able I. Serial-Data Word Format
ADDR
B10 B9
DAT A
B7
B8
B6
B5
B4
B3
B2
B1
B0
A2
MSB
2
10
A1
A0
LSB MSB
2
8
D7
D6
D5
D4
D3
D2
D1
L SB
2
1
D0
2
9
2
7
2
6
2
5
2
4
2
3
2
2
2
0
OPE RAT ION
T he AD8801/AD8803 provides eight channels of programmable
voltage output adjustment capability. Changing the programmed
output voltage of each T rimDAC is accomplished by clocking in
an 11-bit serial data word into the SDI (Serial Data Input) pin.
T he format of this data word is three address bits, MSB first,
followed by eight data bits, MSB first. T able I provides the se-
rial register data word format. T he AD8801/AD8803 has the
following address assignments for the ADDR decode which de-
termines the location of DAC register receiving the serial regis-
ter data in bits B7 through B0:
DAC
# =
A
2
×
4 +
A
1
×
2 +
A
0 + 1
DAC outputs can be changed one at a time in random se-
quence. T he fast serial-data loading of 33 MHz makes it possible
to load all eight DACs in as little time as 3
μ
s (12
×
8
×
30 ns).
T he exact timing requirements are shown in Figure 2.
T he AD8801 offers a midscale preset activated by the
RS
pin
simplifying initial setting conditions at first power up. T he
AD8803 has both a V
REFH
and a V
REFL
pin to establish indepen-
dent positive full-scale and zero-scale settings to optimize reso-
lution. Both parts offer a power shutdown
SHDN
that places
the DAC structure in a zero power consumption state resulting
in only leakage currents being consumed from the power supply,
V
REF
inputs, and all 8 outputs. In shutdown mode the DACx
latch settings are maintained. When returning to operational
mode from power shutdown the DAC outputs return to their
previous voltage settings.
MSB
O
X
2R
R
P CH
N CH
TO OTHER DACS
R
2R
2R
2R
.
.
.
GND
V
REFL
LSB
DAC
REGISTER
D6
D0
D7
V
REFH
Figure 3. AD8801/AD8803 Equivalent TrimDAC Circuit
PROGRAMMING T HE OUT PUT VOLT AGE
T he output voltage range is determined by the external refer-
ence connected to V
REFH
and V
REFL
pins. See Figure 3 for a
simplified diagram of the equivalent DAC circuit. In the case of
the AD8801, its V
REFL
is internally connected to GND and
therefore cannot be offset. V
REFH
can be tied to V
DD
and V
REFL
can be tied to GND establishing a basic rail-to-rail voltage out-
put programming range. Other output ranges are established by
the use of different external voltage references. T he general
transfer equation that determines the programmed output
voltage is:
V
O
(
Dx
) = (
Dx
)/256
×
(
V
REFH
–
V
REFL
) +
V
REFL
(1)
where
Dx
is the data contained in the 8-bit DACx latch.
相关PDF资料 |
PDF描述 |
|---|---|
| AD8803 | Octal 8-Bit TrimDAC with Power Shutdown(带电源关断八路8位微调D/A转换器) |
| AD8803AR | Octal 8-Bit TrimDAC with Power Shutdown |
| AD8803AN | Octal 8-Bit TrimDAC with Power Shutdown |
| AD8801AN | Octal 8-Bit TrimDAC with Power Shutdown |
| AD8801AR | Octal 8-Bit TrimDAC with Power Shutdown |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8801AN | 制造商:Rochester Electronics LLC 功能描述:8CH 8-BIT TRIMDAC W/PWR SHDN - Bulk |
| AD8801AR | 功能描述:IC DAC 8BIT OCTAL W/SD 16-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| AD8801AR-REEL | 功能描述:IC DAC 8BIT OCTAL W/SD 16-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| AD8801ARZ | 功能描述:IC DAC 8BIT OCTAL W/SD 16-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD8801ARZ-REEL | 功能描述:IC DAC 8BIT OCTAL W/SD 16SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
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