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参数资料
| 型号： | AD8802AR |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | 12 Channel, 8-Bit TrimDACs with Power Shutdown |
| 中文描述： | 12, SERIAL INPUT LOADING, 0.6 us SETTLING TIME, 8-BIT DAC, PDSO20 |
| 封装： | SOIC-20 |
| 文件页数： | 15/16页 |
| 文件大小： | 432K |
| 代理商： | AD8802AR |
AD8802/AD8804
REV. 0
–15–
15
13
–H SYNC
OUTPUT
40, 35, 30
38, 28, 33
BLANK GATE
INPUT
24
+4V
V
(+12V)
+12V
V
CC
9
43
22
21
20
5
RGB FEEDBACK
CRT
VIDEO
AMP
CRT
CATHODE
0.1μF
10μF
OUT
IN
GND
REF195
10μF
0.1μF
+12V
V
CC
TO μC
O1 O2 O3 04 O5 O6 O7 V
REFH
CS
AD8802/4
CLK
SDI
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, V
REFH
and V
REFL
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
μ
s for a 40
dB change. The settling time of the AD8802/AD8804 to within
a
±
1/2 LSB band is 0.6
μ
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 V
REFH
at 2.0 V and V
REFL
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 V
REFH
and V
REFL
because these reference inputs
are low impedance (2 k
typical).
相关PDF资料 |
PDF描述 |
|---|---|
| AD8802ARU | 12 Channel, 8-Bit TrimDACs with Power Shutdown |
| AD8804 | 12 Channel, 8-Bit TrimDACs with Power Shutdown(12通道,带电源关断8位D/A转换器) |
| AD8842 | Precision, Quad, SPST Analog Switches |
| AD8842AN | Precision, Quad, SPST Analog Switches |
| AD8842AR | 8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8802AR-REEL | 制造商:Analog Devices 功能描述:DAC 12-CH R-2R 8-bit 20-Pin SOIC W T/R |
| AD8802ARU | 功能描述:IC DAC 8BIT 12CH W/SD 20-TSSOP 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）:* |
| AD8802ARU-REEL | 功能描述:IC DAC 8BIT 12CH W/SD 20-TSSOP 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）:* |
| AD8802ARUZ | 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 |
| AD8802ARUZ-REEL | 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® 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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