参数资料
| 型号： | AD8804ANZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT 12CH W/SD 20DIP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 18 |
| 系列： | TrimDAC® |
| 设置时间： | 600ns |
| 位数： | 8 |
| 数据接口： | 串行 |
| 转换器数目： | 12 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 60µW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输出数目和类型： | 12 电压，单极 |
| 采样率（每秒）： | 1.7M |
AD8802/AD8804
REV. 0
–15–
15
13
–H SYNC
OUTPUT
40, 35, 30
38, 28, 33
BLANK GATE
INPUT
24
+4V
VCC
(+12V)
+12V
VCC
9
43
22
21
20
5
RGB FEEDBACK
CRT
VIDEO
AMP
CRT
CATHODE
0.1F
10F
OUT
IN
GND
REF195
10F
0.1F
+12V
VCC
TO C
O1 O2 O3 04 O5 O6 O7 VREFH
CS
CLK
SDI
AD8802/4
RGB
VIDEO
INPUT
7, 11, 17
LM1204
O1 = 2V
O2 = CONTRAST
O3 = BP CLAMP WIDTH ADJUST
O4 = BLANK LEVEL ADJUST
(FOR BRIGHTNESS CONTROL)
O5 = R AGAIN
O6 = B AGAIN
O7 = G AGAIN
O8 – O12 = NOT USED
R
GAIN
B
GAIN
G
GAIN
Figure 29. A Digitally Controlled LM1204—150 MHz RGB Amplifier System
attenuation the optional circuitry inside the dashed box may be
removed and replaced with a direct connection from O1 of
AD8802/AD8804 to Pin 11 of SSM2018T.
When high gain resolution is desired, VREFH and VREFL may be
decoupled from the power rails and shifted closer together.
This technique increases the gain resolution with the unfortu-
nate penalty of decreased gain range.
A Digitally Controlled LM1204 150 MHz RGB Amplifier
System
The LM1204 is an industry standard video amplifier system.
Figure 29 illustrates a configuration that removes the usual
seven level setting potentiometers and replaces them with only
one IC. The AD8802/AD8804, in addition to being smaller
and more reliable than mechanical potentiometers, has the
added feature of digital control.
The REF195 is a 5.0 V reference used to supply both the power
and reference voltages to the AD8802/AD8804. This is possible
because of the high reference output current available (30 mA
typical) together with the low power consumption of the
AD8802/AD8804.
A Low Noise 90 MHz Programmable Gain Amplifier
The AD603 is a low noise, voltage-controlled amplifier for use
in RF and IF AGC systems. It provides accurate, pin selectable
gains of –11 dB to +31 dB with a bandwidth of 90 MHz or
+9 dB to +51 dB with a bandwidth of 9 MHz. Any intermedi-
ate gain range may be arranged using one external resistor
between Pins 5 and 7. The input referred noise spectral density
is only 1.3 nV
√Hz and power consumption is 125 mW at the
recommended
±5 V supplies.
The decibel gain is “linear in dB,” accurately calibrated, and
stable over temperature and supply. The gain is controlled at a
high impedance (50 M
), low bias (200 nA) differential input;
the scaling is 25 mV/dB, requiring a gain-control voltage of only
1 V to span the central 40 dB of the gain range. An overrange
and underrange of 1 dB is provided whatever the selected
range. The gain-control response time is less than 1
s for a 40
dB change. The settling time of the AD8802/AD8804 to within
a
±1/2 LSB band is 0.6 s making it an excellent choice for con-
trol of the AD603.
The differential gain-control interface allows the use of either
differential or single-ended positive or negative control voltages,
where the common-mode range is –1.2 V to 2.0 V. Once again
the AD8802/AD8804 is ideally suited to provide the differential
input range of 1 V within the common-mode range of 0 V to
2 V. To accomplish this, place VREFH at 2.0 V and VREFL at
1.0 V, then all 256 voltage levels of the AD8804 will fall within
the gain-control range of the AD603. Please refer to the AD603
data sheet for further information regarding gain control, layout,
and general operation.
The dual OP279 is a rail-to-rail op amp used in Figure 30 to
drive the inputs VREFH and VREFL because these reference inputs
are low impedance (2 k
typical).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8804AR | 功能描述:IC DAC 8BIT 12CH W/SD 20-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:2,400 系列:- 设置时间:- 位数:18 数据接口:串行 转换器数目:3 电压电源:模拟和数字 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:36-TFBGA 供应商设备封装:36-TFBGA 包装:带卷 (TR) 输出数目和类型:* 采样率（每秒）:* |
| AD8804AR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD8804ARU | 制造商:Analog Devices 功能描述:DAC 12-CH R-2R 8-bit 20-Pin TSSOP |
| AD8804ARU-REEL | 制造商:Analog Devices 功能描述:DAC 12-CH R-2R 8-bit 20-Pin TSSOP T/R |
| AD8804ARUZ | 功能描述:IC DAC 8BIT 12CH W/SD 20TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TrimDAC® 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
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