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| 型號： | AD8556ARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CHOPPER 2MHZ 10MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | DigiTrim® |
| 放大器類型： | 斷路器（零漂移） |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1.2 V/µs |
| 增益帶寬積： | 2MHz |
| 電流 - 輸入偏壓： | 49nA |
| 電壓 - 輸入偏移： | 2µV |
| 電流 - 電源： | 2mA |
| 電流 - 輸出 / 通道： | 10mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 140°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
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AD8556
Rev. A | Page 18 of 28
OPEN WIRE FAULT DETECTION
The inputs to A1 and A2, VNEG and VPOS, each have a com-
parator to detect whether VNEG or VPOS exceeds a threshold
voltage, nominally VDD 2.0 V. If (VNEG > VDD 2.0 V) or
(VPOS > VDD 2.0 V), VOUT is clamped to VSS. The output
current limit circuit is disabled in this mode, but the maximum
sink current is approximately 10 mA when VDD = 5 V. The inputs
to A1 and A2, VNEG and VPOS, are also pulled up to VDD by
currents IP1 and IP2. These are both nominally 49 nA and
matched to within 3 nA. If the inputs to A1 or A2 are accidentally
left floating, as with an open wire fault, IP1 and IP2 pull them
to VDD, which would cause VOUT to swing to VSS, allowing
this fault to be detected. It is not possible to disable IP1 and IP2,
nor the clamping of VOUT to VSS, when VNEG or VPOS
approaches VDD.
SHORTED WIRE FAULT DETECTION
The AD8556 provides fault detection when VPOS, VNEG, or
VCLAMP shorts to VDD and VSS. Figure 48 shows the voltage
regions at VPOS, VNEG, and VCLAMP that trigger an error
condition. When an error condition occurs, the VOUT pin is
VPOS
VNEG
VSS
VINL
VINH
VDD
VSS
VCLL
VDD
VCLAMP
VSS
VINL
VINH
VDD
ERROR
NORMAL
ERROR
NORMAL
ERROR
NORMAL
05
44
8
-04
8
Figure 48. Voltage Regions at VPOS, VNEG, and VCLAMP
that Trigger a Fault Condition
Table 7. Typical VINL, VINH, and VCLL Values (VDD = 5 V)
Voltage
Min (V)
Typ (V)
Max (V)
VOUT Condition
VINH
2.95
3.0
3.05
Short to VSS fault
detection
VINL
1.95
2.0
2.05
Short to VSS fault
detection
VCLL
1.05
1.1
1.15
Short to VSS fault
detection
FLOATING VPOS, VNEG, OR VCLAMP FAULT
DETECTION
A floating fault condition at the VPOS, VNEG, or VCLAMP
pins is detected by using a low current to pull a floating input
into an error voltage range, defined in the Shorted Wire Fault
Detection section. In this way, the VOUT pin is shorted to VSS
when a floating input is detected. Table 8 lists the currents used.
Table 8. Floating Fault Detection at VPOS, VNEG, and
VCLAMP
Mnemonic
Typical Current
Goal of Current
VPOS
49 nA pull-up
Pull VPOS above VINH
VNEG
49 nA pull-up
Pull VNEG above VINH
VCLAMP
0.2 μA pull-down
Pull VCLAMP below VCLL
DEVICE PROGRAMMING
Digital Interface
The digital interface allows the first stage gain, second stage
gain, and output offset to be adjusted and allows desired values
for these parameters to be permanently stored by selectively
blowing polysilicon fuses. To minimize pin count and board
space, a single-wire digital interface is used. The digital input pin,
DIGIN, has hysteresis to minimize the possibility of inadvertent
triggering with slow signals. It also has a pull-down current sink
to allow it to be left floating when programming is not being
performed. The pull-down ensures inactive status of the digital
input by forcing a dc low voltage on DIGIN.
A short pulse at DIGIN from low to high and back to low again,
such as between 50 ns and 10 μs long, loads 0 into the shift register.
A long pulse at DIGIN, such as 50 μs or longer, loads 1 into the
shift register. The time between pulses should be at least 10 μs.
Assuming VSS = 0 V, voltages at DIGIN between VSS and 0.2 ×
VDD are recognized as a low, and voltages at DIGIN between
0.8 × VDD and VDD are recognized as a high. The timing
diagram example in Figure 49 shows the waveform for entering
code 010011 into the shift register.
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| AD8556CP-EBZ | 功能描述:AD8556 DigiTrim? Series 1 - Single Channels per IC Chopper (Zero-Drift) Amplifier Evaluation Board 制造商:analog devices inc. 系列:DigiTrim? 零件狀態(tài):有效 每 IC 通道數(shù):1 - 單 放大器類型:斷路器（零漂移） 輸出類型:單端 壓擺率:1.2 V/μs -3db 帶寬:- 電流 - 輸出/通道:10mA 工作溫度:-40°C ~ 140°C 電流 - 電源（主 IC）:2mA 電壓 - 電源，單/雙（±）:4.5 V ~ 5.5 V 板類型:完全填充 所含物品:板 使用的 IC/零件:AD8556 標(biāo)準(zhǔn)包裝:1 |
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| AD8557ACPZ-R2 | 功能描述:IC AMP CHOPPER 2MHZ 55MA 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
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