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參數(shù)資料
| 型號： | AD7657 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC |
| 中文描述： | 250 kSPS的6通道同步采樣ADC的雙極12/14/16-Bit |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 308K |
| 代理商： | AD7657 |
AD7658/AD7657/AD7656
Preliminary Technical Data
ADC TRANSFER FUNCTION
The output coding of the AD7658/AD7657/AD7656 is two’s
Complement. The designed code transitions occur midway
between successive integer LSB values, i.e., 1/2 LSB, 3/2 LSBs.
The LSB size is FSR/4096 for the AD7658, FSR/16384 for the
AD7657 and FSR/65536 for the AD7656. The ideal transfer
characteristic for the AD7658/AD7657/AD7656 is shown in
Figure 4.
Rev. PrI | Page 16 of 25
000...000
111...111
-
FSR/2 +
1/2LSB
A
ANALOG INPUT
011...111
011...110
100...001
100...000
100...010
000...001
+FSR/2 -
3/2LSB
AGND - 1LSB
Figure 4. AD7658/AD7657/AD7656 Transfer Characteristic
The LSB size is dependant on the Analog Input Range selected.
See Table 7.
Reference Section
The VREF pin either provides access to the
Table 7. LSB sizes for each Analog Input Range
AD7656
AD7658/AD7657/AD7656’s own 2.5V reference or allows for an
external reference to be connected providing the reference
source for the AD7658/AD7657/AD7656 conversions. The
AD7658/AD7657/AD7656 can accommodate a 2.5V to 3V
external reference range. When using an external reference the
internal reference needs to be disabled. After a RESET the
AD7658/AD7657/AD7656 defaults to operating in external
Reference mode. The internal reference can be enabled in either
hardware or software mode. To enable the internal reference in
hardware mode, H/S SEL pin =0 and the REF EN/DISABLE = 1.
To enable the internal reference in software mode H/S SEL pin
=1, a write to the control register is necessary to make DB1 of
the register = 1. The REFIN/OUT pin should be decoupled
using 10 μF and 100 nF capacitors.
The AD7656 contains three on-chip reference buffers. Each of
the three ADC pairs has an associated reference buffer. These
reference buffers require external decoupling caps on REF
CAP
A,
REF
CAP
B, and REF
CAP
C pins. 10 μF and 100 nF decoupling
capacitor should be placed on these REF
CAP
pins.
AD7657
AD7658
Input Range
±10V
±5V
±10V
±5V
±10V
±5V
FS Range
20V/65536
10V/65536
20V/16384
10V/16384
20V/4096
10V/4096
LSB Size
0.305 mV
0.152 mV
1.22 mV
0.61 mV
4.88 mV
2.44 mV
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Figure 5. AD7658/AD7657/AD7656 Typical connection diagram.
Note 1: Decoupling shown on the
AV
CC
pin applies to each AV
CC
pin.
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