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參數(shù)資料
| 型號(hào)： | AD7927BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大小： | 461K |
| 代理商： | AD7927BRU |
REV. 0
AD7927
–13–
ADC TRANSFER FUNCTION
The output coding of the AD7927 is either straight binary or
twos complement, depending on the status of the LSB in the
Control Register. The designed code transitions occur at suc-
cessive LSB values (i.e., 1 LSB, 2 LSBs, and so forth). The LSB
R3
R2
R4
REF
IN
V
IN
0
V
IN
7
AD7927
DSP/ P
V
DD
0.1 F
V
AV
DD
V
DRIVE
DOUT
TWOS
COMPLEMENT
+REF
IN
REF
IN
–REF
IN
011…111
000…000
100…000
(= 0V)
(= 2 REF
IN
)
0V
V
R1
R1 R2 R3 R4
V
DD
V
REF
Figure 10. Handling Bipolar Signals
000…000
0V
ANALOG INPUT
111…111
111…110
111…000
011…111
000…001
000…010
1 LSB
+V
REF
1 LSB
1LSB V
REF
/4096
NOTE: V
REF
IS EITHER REF
IN
OR 2 REF
IN
Figure 8. Straight Binary Transfer Characteristic
size is REF
IN
/4096 for the AD7927. The ideal transfer charac-
teristic for the AD7927 when straight binary coding is selected
is shown in Figure 8, and the ideal transfer characteristic for the
AD7927 when twos complement coding is selected is shown in
Figure 9.
–V
REF
1LSB
A
ANALOG INPUT
+V
REF
1LSB
1LSB 2 V
REF
4096
V
REF
1LSB
100…000
011…111
011…110
000…001
000…000
100…001
100…010
111…111
Figure 9. Twos Complement Transfer Characteristic with
REF
IN
±
REF
IN
Input Range
Handling Bipolar Input Signals
Figure 10 shows how useful the combination of the 2
￥
REF
IN
input range and the twos complement output coding scheme is
for handling bipolar input signals. If the bipolar input signal is
biased about REF
IN
and twos complement output coding is
selected, then REF
IN
becomes the zero code point,
–
REF
IN
is
negative full scale and +REF
IN
becomes positive full scale, with
a dynamic range of 2
￥
REF
IN
.
TYPICAL CONNECTION DIAGRAM
Figure 11 shows a typical connection diagram for the AD7927.
In this setup, the AGND pin is connected to the analog ground
plane of the system. In Figure 11, REF
IN
is connected to a
decoupled 2.5 V supply from a reference source, the AD780, to
provide an analog input range of 0 V to 2.5 V (if RANGE bit is 1)
or 0 V to 5 V (if RANGE bit is 0). Although the AD7927 is con-
nected to a AV
DD
of 5 V, the serial interface is connected to a 3 V
microprocessor. The V
DRIVE
pin of the AD7927 is connected to
the same 3 V supply of the microprocessor to allow a 3 V logic
interface (see the Digital Inputs section). The conversion result is
output in a 16-bit word. This 16-bit data stream consists of one
leading zero, three address bits indicating which channel the
conversion result corresponds to, followed by the 12 bits of
conversion data. For applications where power consumption is
of concern, the power-down modes should be used between
conversions or bursts of several conversions to improve power
performance. (See the Modes of Operation section.)
SERIAL
INTERFACE
AD780
2.5V
AD7927
0.1 F
C/ P
0.1 F
10 F
3V
SUPPLY
5V
SUPPLY
0.1 F
10 F
AGND
AV
DD
V
IN
0
V
IN
7
0V TO REF
IN
SCLK
DOUT
CS
DIN
V
DRIVE
REF
IN
NOTE: ALL UNUSED INPUT CHANNELS SHOULD BE CONNECTED TO AGND
Figure 11. Typical Connection Diagram
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