- 鎮ㄧ従(xi脿n)鍦ㄧ殑浣嶇疆锛�璨疯常IC缍�(w菐ng) > PDF鐩寗1983 > AD7829BRW-1 (Analog Devices Inc)IC ADC 8BIT 8CH 2MSPS 28-SOIC PDF璩囨枡涓嬭級
鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉锛� | AD7829BRW-1 |
| 寤犲晢锛� | Analog Devices Inc |
| 鏂囦欢闋佹暩(sh霉)锛� | 4/20闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC ADC 8BIT 8CH 2MSPS 28-SOIC |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 27 |
| 浣嶆暩(sh霉)锛� | 8 |
| 閲囨ǎ鐜囷紙姣忕锛夛細 | 2M |
| 鏁�(sh霉)鎿�(j霉)鎺ュ彛锛� | 骞惰伅(li谩n) |
| 杞�(zhu菐n)鎻涘櫒鏁�(sh霉)鐩細 | 1 |
| 鍔熺巼鑰楁暎锛堟渶澶э級锛� | 36mW |
| 闆诲闆绘簮锛� | 鍠浕婧� |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 28-SOIC锛�0.295"锛�7.50mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 28-SOIC W |
| 鍖呰锛� | 绠′欢 |
| 杓稿叆鏁�(sh霉)鐩拰椤炲瀷锛� | 8 鍊嬪柈绔�锛屽柈妤� |
绗�1闋�绗�2闋�绗�3闋�鐣�(d膩ng)鍓嶇4闋�绗�5闋�绗�6闋�绗�7闋�绗�8闋�绗�9闋�绗�10闋�绗�11闋�绗�12闋�绗�13闋�绗�14闋�绗�15闋�绗�16闋�绗�17闋�绗�18闋�绗�19闋�绗�20闋�
AD7829-1
Rev. 0 | Page 12 of 20
VREF
VMID
VIN
R3
R4
R2
R1
V
0V
VIN
0V
2.5V
AD7829-1
2.5V
06
17
9-
0
12
5V
4V
3V
2V
1V
VDD = 5V
INPUT SIGNAL RANGE
FOR VARIOUS VMID
VMID = N/C (1.25V)
VMID = 2.5V
VMID = 3.75V
3V
2V
1V
VDD = 3V
INPUT SIGNAL RANGE
FOR VARIOUS VMID
VMID = N/C (1V)
VMID = 1.5V
VMID = 2V
0
61
79
-01
0
Figure 11. Accommodating Bipolar Signals Using External VMID
R2
VREF
VMID
VIN
EXTERNAL
2.5V
R3
R4
R1
V
0V
VIN
0V
VMID
06
17
9
-01
3
AD7829-1
Figure 9. Analog Input Span Variation with VMID
VMID can be used to remove offsets in a system by applying the
offset to the VMID pin, as shown in
Figure 12. Accommodating Bipolar Signals Using Internal VMID
Figure 10; or it can be used
to accommodate bipolar signals by applying VMID to a level-shifting
NOTE: Although there is a VREF pin from which a voltage
reference of 2.5 V can be sourced, or to which an external
reference can be applied, this does not provide an option of
varying the value of the voltage reference. As stated in the
specifications for the AD7829-1, the input voltage range at this
pin is 2.5 V 卤 2%.
driven by an external source, the source can be directly tied to
the level-shifting circuitry (see Figure 11); however, if the internal
VMID, that is, the default value, is being used as an output, it must
be buffered before applying it to the level-shifting circuitry, because
the VMID pin has an impedance of approximately 6 k惟 (see
Analog Input Structure
Figure 13 shows an equivalent circuit of the analog input
structure of the AD7829-1. The two diodes, D1 and D2, provide
ESD protection for the analog inputs. Care must be taken to
ensure that the analog input signal never exceeds the supply
rails by more than 200 mV. This causes these diodes to become
forward biased and start conducting current into the substrate.
20 mA is the maximum current these diodes can conduct
without causing irreversible damage to the part. However, it is
worth noting that a small amount of current (1 mA) conducted
into the substrate due to an overvoltage on an unselected channel
can cause inaccurate conversions on a selected channel.
VIN
VMID
AD7829-1
VMID
VIN
VMID
0
61
79
-0
11
Figure 10. Removing Offsets Using VMID
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
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