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| 型號： | AD215BY |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 12/12頁 |
| 文件大小： | 0K |
| 描述： | IC AMP ISOL LDIST 5MA 44SIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 隔離 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 6 V/µs |
| -3db帶寬： | 120kHz |
| 電流 - 輸入偏壓： | 300pA |
| 電壓 - 輸入偏移： | 400µV |
| 電流 - 電源： | 40mA |
| 電流 - 輸出 / 通道： | 5mA |
| 電壓 - 電源，單路/雙路(±)： | ±14.25 V ~ 17 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 44-SIP，12 引線，偏移引線 |
| 供應(yīng)商設(shè)備封裝： | 12-SIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 772 (CN2011-ZH PDF) |
AD215
REV. 0
–9–
Input Gain Adjustments for the Inverting Mode
Figure 17 shows a suggested inverting gain adjustment circuit.
In this circuit, gain adjustment is made using a potentiometer
(RP) in the feedback loop. The adjustments are effective for all
gains in the 1 to 10 V/V range.
VSIGNAL
RF
RC
RIN
IN+
IN–
FB
IN COM
OUT HI
OUT LO
PWR
RTN
COM
TRIM
OUTPUT
FILTER,
BUFFER
AND
TRIM
CIRCUITRY
1
3
4
2
38
36
37
43
AD215
CF
47pF
RF
1k
Figure 17. Gain Adjustment for Inverting Configuration
For an approximate
±1% gain trim range,
RX =
RIN × RF
RIN + RF
and select
RC = 0.02
× R
IN
while
RF < 10 k
CF = 47 pF
Note: RF and RIN should have matched temperature coefficient
drift characteristics.
Output Offset Adjustments
Figure 18 illustrates one method of adjusting the output offset
voltage. Since the AD215 exhibits a nominal output offset of
–35 mV, the circuit shown was chosen to yield an offset correc-
tion of 0 mV to +73 mV. This results in a total output offset
range of approximately –35 mV to +38 mV.
IN+
IN–
FB
IN COM
OUT HI
OUT LO
COM
TRIM
LOW-PASS
FILTER,
(150k
)
1
3
4
2
38
AD215
RT
1M
RS
100k
RP2
10k
OUTPUT
BUFFER
33k
0.01F
37
36
42
+15VIN
PWR RTN
–15VIN 44
43
2.2F
–15V dc
+15V dc
Figure 18. Output Offset Adjustment Circuit
Output Gain Adjustments
Since the output amplifier stage of the AD215 is fixed at unity
gain, any adjustments can be made only in a subsequent stage.
USING ISOLATED POWER
Each AD215 provides an unregulated, isolated bipolar power
source of
±15 V dc @ ±10 mA, referred to the input common.
This source may be used to power various ancillary components
such as signal conditioning and/or adjustment circuitry, refer-
ences, op amps or remote transducers. Figure 19 shows typical
connections.
IN+
IN–
FB
IN COM
OUT HI
OUT LO
COM
TRIM
1
3
4
2
AD215
37
36
+VS
PWR
RTN
–VS
43
2.2F
–15V dc
+15V dc
+VISO
–VISO
C1
6.8F
6
C2
6.8F
5
1.5k
1.5k
LOAD
ISOLATED
DC
SUPPLY
430kHz
POWER
OSCIL-
LATOR
OUTPUT
FILTER,
BUFFER
AND
TRIM
CIRCUITRY
42
44
38
Figure 19. Using the Isolated Power Supplies
PCB LAYOUT FOR MULTICHANNEL APPLICATIONS
The pin out of the AD215 has been designed to easily facilitate
multichannel applications. Figure 20a shows a recommended
circuit board layout for a unity gain configuration.
38
36
42
44
37
43
38
36
42
44
37
43
38
36
42
44
37
43
38
36
42
44
37
43
2.2F
+15V dc
–15V dc
PWR
RTN
SUPPLY BYPASS
CAPACITORS FOR
EVERY FOUR
AD215s
OUT HI0
TRIM 0
OUT HI1
TRIM 1
OUT HI2
TRIM 2
OUT HI3
TRIM 3
ANALOG
STAR
GROUND
Figure 20a. PCB Layout for Unity Gain
CAUTION
The AD215 design does not provide short-circuit protection of
its isolated power supply. A current limiting resistor should be
placed in series with the supply terminals and the load in order
to protect against inadvertent shorts.
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|---|---|
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