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參數(shù)資料
| 型號： | AD8802ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 8BIT 12CH W/SD 20SOIC |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1,000 |
| 系列： | TrimDAC® |
| 設置時間： | 600ns |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 12 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 60µW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 12 電壓，單極 |
| 采樣率（每秒）： | 1.7M |
AD8802/AD8804
REV. 0
–14–
USER
INPUTS
3
TO 2nd AD8802/4
ARRAY IF NEEDED
TO 2nd TEMP SENSOR
IF NEEDED
4
TO 3rd TEMP SENSOR
IF NEEDED
4
0.1F
10F
+5V
0.1F
TMP14
0.01F
3
VCC
OUT
RS
DIS
THR
TRIG
GND
AD8802/4
TLC555
2.5 VREF
SET 1
SET 2
SET 3
SET 4
HYS
TRIP 1
TRIP 2
TRIP 3
TRIP 4
V+
GND
SLEEP
O1
O3
O4
O2
05–8
09–12
VDD
GND
SHDN
CS
CLK
SDI
P2.0
P2.1
P2.2
P2.3
P2.4
80CL51 C
P1.0/INT2
P0.0
P0.7
P3.2
P3.1
P3.0
P3.3
VREFH
+5V
Figure 27. Temperature Sensor Array with Programmable Setpoints
The gain of the SSM2018T is controlled by the voltage at Pin 11.
For maximum attenuation of –100 dB a control signal of 3.0 V
typ is necessary. The control signal has a scale of –30 mV/dB
centered around 0 dB gain for 0 V of control voltage, therefore,
for a maximum gain of 40 dB a control voltage of –1.2 volts is
necessary. Now notice that the normal +5 V to GND voltage
range of the AD8802/AD8804 does not cover the 3.0 V to
–1.2 V operational gain control range of the SSM2018T. To
cover the operating gain range fully and not exceed the maxi-
mum specified power supply rating requires the O1 output of
AD8802/AD8804 to be level shifted down. In Figure 28, the
level shifting is accomplished by a Zener diode and 1/4 of an
OP420 quad op amp. For applications that require only
TMP14, and makes the necessary adjustments to the AD8802/
AD8804 before shutting down again. The 80CL51 consumes
only 50
A when operating at 32 kHz, in which case there
would be no need for the TLC555, which consumes 1 mW typ.
12 Channel Programmable Voltage Controlled Amplifier
The SSM2018T is a trimless Voltage Controlled Amplifier
(VCA) for volume control in audio systems. The SSM2018T is
the first professional quality audio VCA in the marketplace that
does not require an external trimming potentiometer to mini-
mize distortion. The TrimDAC shown in Figure 28 is not being
used to trim distortion, but rather to control the gain of the am-
plifier. In this configuration up to twelve SSM2018T can be
digitally controlled. (Please refer to the SSM2018T data sheet
for more specifications and applications information.)
–15V
RO
150k
+V
50pF
18k
18k
1F
18k
1F
+15V
8
1
2
3
4
7
6
5
14
13
12
11
16
15
10
9
SSM2018T
OP420A
1.2V
+15V
50k
OPTIONAL FOR
0 TO 40dB GAIN
VOUT
O1
VREFH
O2–
O12
TO 8 MORE CHANNELS
O2
O3
O4–O12
CS
CLK
SDI
3
TO C
1F
VREFL
(AD8804
ONLY)
OUT
IN
GND
REF195
V+
GND
+15V
AD8802/4
47pF
NC
Figure 28. 12-Channel Programmable Voltage Controlled Amplifier
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