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| 型號： | AD8556ARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 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 23 of 28
Important:
Once a programming attempt is made for any
fuse, there should be no further attempt to blow that fuse.
If a fuse does not program to the expected state, discard
the unit. The expected incidence rate of attempted but
unblown fuses is very small when following the proper
programming procedure and conditions.
3.
Set VSS to 0 V and VDD to 5.25 V (±0.25 V). Power
supplies should be capable of supplying 250 mA at the
required voltage and properly bypassed as described
in the Programming Mode section. Use program mode to
permanently enter the desired codes for the first stage gain,
second stage gain, and output offset. Blow the parity bit
fuse if necessary (see Parity Error Detection section). Blow
the master fuse to allow the AD8556 to read data from the
fuses and to prevent further programming.
4.
Set VDD and VSS to the desired values in the application.
Use read mode with low sense current followed by high
sense current to verify programmed codes.
5.
Measure gain and offset to verify correct functionality.
Determining Optimal Gain and Offset Codes
First, determine the desired gain:
1.
Determine the desired gain, GA (using the measurements
obtained from the simulation).
2.
that (4.00 × 1.04) < (GA/G2) < (6.4/1.04). This ensures the
first and last codes for the first stage gain are not used,
thereby allowing enough first stage gain codes within each
second stage gain range to adjust for the 3% accuracy.
Next, set the second stage gain:
1.
Use the simulation mode to set the second stage gain to G2.
2.
Set the output offset to allow the AD8556 gain to be
measured, for example, use Code 128 to set it to
midsupply.
3.
Use Table 5 or Equation 1 to set the first stage gain code
CG1, so the first stage gain is nominally GA/G2.
4.
Measure the resulting gain, GB. G
B
should be within
3% of GA.
5.
Calculate the first stage gain error (in relative terms)
EG1 = GB/G
B
A
1.
6.
Calculate the error (in the number of the first stage gain
codes) CEG1 = EG1/0.00370.
7.
Set the first stage gain code to CG1 CEG1.
8.
Measure the gain, GC. GC should be closer to GA than to GB.
B
9.
Calculate the error (in relative terms) EG2 = GC/GA 1.
10. Calculate the error (in the number of the first stage gain
codes) CEG2 = EG2/0.00370.
11. Set the first stage gain code to CG1 CEG1 CEG2. The
resulting gain should be within one code of GA.
Finally, determine the desired output offset:
1.
Determine the desired output offset OA (using the
measurements obtained from the simulation).
2.
Use Equation 2 to set the output offset code CO1 such that
the output offset is nominally OA.
3.
Measure the output offset, OB. O
B
should be within
3% of OA.
4.
Calculate the error (in relative terms) EO1 = OB/O
B
A
1.
5.
Calculate the error (in the number of the output offset
codes) CEO1 = EO1/0.00392.
6.
Set the output offset code to CO1 CEO1.
7.
Measure the output offset, OC. OC should be closer to OA
than to OB.
B
8.
Calculate the error (in relative terms) EO2 = OC/OA 1.
9.
Calculate the error (in the number of the output offset
codes) CEO2 = EO2/0.00392.
10. Set the output offset code to CO1 CEO1 CEO2. The
resulting offset should be within one code of OA.
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